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SEL-734W and SEL Wireless Current SensorInstruction Manual
SEL-734W and SEL-WCS
Capacitor Bank Control and
SEL Wireless Current Sensors
Field Reference Guide
20191029
*PM734W-01*
Page 2
© 2019 by Schweitzer Engineering Laboratories, Inc. All rights reserved.
All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL trademarks
may be used without written permission.
SEL products appearing in this document may be covered by U.S. and Foreign patents. Schweitzer Engineering Laboratories, Inc. reserves all
rights and benefits afforded under federal and international copyright and patent laws in its products, including without limitation software,
firmware, and documentation.
The information in this document is provided for informational use only and is subject to change without notice. Schweitzer Engineering
Laboratories, Inc. has approved only the English language document.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit selinc.com or contact your customer service
representative. PM734W-01
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
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SEL-734W and SEL Wireless Current SensorInstruction Manual
Table of Contents
List of Tables.............................................................................................................................................................................. iii
List of Figures.............................................................................................................................................................................v
Preface..........................................................................................................................................................................................vii
Overview.............................................................................................................................................................. .vii
Safety Information ............................................................................................................................................... .vii
General Information................................................................................................................................................ix
Section 1: Introduction and Specifications
Overview...............................................................................................................................................................1.1
System Features and Benefits...............................................................................................................................1.2
Product Overview .................................................................................................................................................1.3
SEL-734W Overview............................................................................................................................................1.4
SEL-WCS Specifications......................................................................................................................................1.6
SEL-734W Specifications.....................................................................................................................................1.7
Section 2: Installation
Overview...............................................................................................................................................................2.1
Dimensions ...........................................................................................................................................................2.1
Installations...........................................................................................................................................................2.2
Getting Started ......................................................................................................................................................2.6
Section 3: Applications
Single-Phase Measurement and Ganged Switching .............................................................................................3.1
Three-Phase Measurements and Ganged Switching.............................................................................................3.1
Section 4: SEL-734W
Overview...............................................................................................................................................................4.1
Capacitor Bank Control ........................................................................................................................................4.1
Front-Panel Operations .........................................................................................................................................4.3
Power System Quantity Measurements ................................................................................................................4.5
Section 5: SEL-WCS
Overview...............................................................................................................................................................5.1
Current Measurements..........................................................................................................................................5.1
Section 6: Differences Between the SEL-734B and the SEL-734W
Overview...............................................................................................................................................................6.1
Capacitor Bank Control Strategies........................................................................................................................6.1
Metering................................................................................................................................................................6.2
Power Quality and Event Analysis .......................................................................................................................6.2
Section 7: Testing and Troubleshooting
Appendix A: Field Reference Guide Versions
Field Reference Guide .........................................................................................................................................A.1
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
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SEL-734W and SEL Wireless Current SensorInstruction Manual
List of Tables
Table 2.1 Socket Stab Configurations .........................................................................................................2.3
Table 4.1 Front-Panel LED Descriptions ....................................................................................................4.4
Table 5.1 SEL-WCS Typical Update Period Versus Line Current .............................................................5.1
Table 5.2 Frequency Channels ....................................................................................................................5.2
Table 5.3 Phase Identification Configuration..............................................................................................5.3
Table 6.1 SEL-734W and SEL-734B Control Strategy Comparison..........................................................6.1
Table 7.1 Troubleshooting and Common Problems ....................................................................................7.1
Table A.1 Field Reference Guide Revision History....................................................................................A.1
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
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SEL-734W and SEL Wireless Current SensorInstruction Manual
List of Figures
Figure 1.1 SEL-734W and SEL-WCS Capacitor Bank Control System ......................................................1.1
Figure 1.2 System Overview.........................................................................................................................1.2
Figure 1.3 SEL-WCS Key Components .......................................................................................................1.3
Figure 1.4 SEL-734W Front Panel Overview...............................................................................................1.4
Figure 2.1 4-Jaw Socket-Based Enclosure Dimensions................................................................................2.1
Figure 2.2 SEL-WCS Dimensions ................................................................................................................2.2
Figure 2.3 Rear of a Socket-Based Enclosure...............................................................................................2.3
Figure 2.4 SEL-734W Required System Grounding ....................................................................................2.4
Figure 3.1 Single-Phase Application ............................................................................................................3.1
Figure 3.2 Three-Phase Application .............................................................................................................3.1
Figure 4.1 SEL-734W ...................................................................................................................................4.2
Figure 4.2 SEL-734W DIP Switch Settings..................................................................................................4.3
Figure 5.1 Control (DIP) Switch Configurations..........................................................................................5.2
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SEL-734W and SEL Wireless Current SensorInstruction Manual
DANGER
WARNING
CAUTION
CAUTION
ATTENTION
Overview
Preface
The SEL-734W Capacitor Bank Control is based on the SEL-734 Advanced
Metering System platform. Devices ship with an outdoor-rated enclosure and are
programmed with control strategies via SEL design templates.
The SEL-734W Field Reference Guide provides a general overview of the
SEL-734W and describes the procedures for installation as a capacitor bank control. This guide also provides troubleshooting and testing methods.
The SEL-734W Data Sheet describes the SEL-734W and SEL-WCS system, the
features and control strategies of the SEL-734W, as well as interface.
The SEL-734W
operation, details the settings, and contains logical diagrams for developers.
The SEL-734 Instruction Manual details all other features available in the
SEL-734 device, including metering, power quality, and communications.
Safety Information
Dangers, Warnings, and Cautions
This manual uses three kinds of hazard statements, defined as follows:
Indicates an imminently hazardous situation
that, if not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation
that, if not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation
that, if not avoided, may result in minor or moderate injury or equipment damage.
ACSELERATOR QuickSet Design Template Guide describes the
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Safety Symbols
The following symbols are often marked on SEL products.
Refer to accompanying documents.
Earth (ground) Terre
Protective earth (ground) Terre de protection
Se reporter à la documentation.
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viii
CAUTION
ATTENTION
WARNING – EXPLOSION HAZARD
AVERTISSEMENT – DANGER D'EXPLOSION
WARNING – EXPLOSION HAZARD
AVERTISSEMENT – DANGER D'EXPLOSION
DANGER
DANGER
DANGER
DANGER
Preface
Safety Information
Safety Marks
General Safety Marks
Direct current Courant continu
Alternating current Courant alternatif
Both direct and alternating current Courant continu et alternatif
Instruction manual Manuel d’instructions
The following statements apply to this device.
There is danger of explosion if the battery is incorrectly replaced.
Replace only with Rayovac no. BR2335 or equivalent recommended by
manufacturer. See Owner's Manual for safety instructions. The battery
used in this device may present a fire or chemical burn hazard if mistreated. Do not recharge, disassemble, heat above 100°C or incinerate.
Dispose of used batteries according to the manufacturer’s instructions.
Keep battery out of reach of children.
For use in Pollution Degree 2 environment. Pour l'utilisation dans un environnement de Degré de Pollution 2.
Ambient air temperature shall not exceed 40°C (104°F). La température ambiante de l'air ne doit pas dépasser 40°C (104°F).
Terminal Ratings Valeurs nominales des bornes
Wire Material
Copper
Tightening Torque
Other Terminal Blocks: 0.8 Nm (7.0 in-lb)
Hazardous Locations Safety Marks
Open circuit before removing cover.
Substitution of components may impair suitability for Class I, Division 2.
Operating Temperature Range: –40°C to +85°C (–40°F to +185°F). Plage de température de fonctionnement : –40°C à +85°C
Une pile remplacée incorrectement pose des risques d’explosion. Remplacez seulement avec un Rayovac no BR2335 ou un produit équivalent
recommandé par le fabricant. Voir le guide d’utilisateur pour les instructions de sécurité. La pile utilisée dans cet appareil peut présenter un
risque d’incendie ou de brûlure chimique si vous en faites mauvais
usage. Ne pas recharger, démonter, chauffer à plus de 100°C ou incinérer. Éliminez les vieilles piles suivant les instructions du fabricant. Gardez
la pile hors de la portée des enfants.
Matériau de fil
Cuivre
Couple de Serrage
Autres borniers : 0,8 Nm (7,0 livres-pouce)
Ouvrir le circuit avant de déposer le couvercle.
La substitution de composants peut détériorer la conformité à Classe I,
Division 2.
(–40°F à +185°F).
Hazardous Locations Operating Temperature Range: –20°C to
+40°C (–4°F to +104°F).
Other Safety Marks (Sheet 1 of 2)
Disconnect or de-energize all external connections before opening this
device. Contact with hazardous voltages and currents inside this device
can cause electrical shock resulting in injury or death.
Contact with instrument terminals can cause electrical shock that can
result in injury or death.
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Emplacements Plage de température de fonctionnement
d’emplacements dangereux : –20°C à +40°C (–4°F à +104°F).
Débrancher tous les raccordements externes avant d’ouvrir cet appareil.
Tout contact avec des tensions ou courants internes à l’appareil peut
causer un choc électrique pouvant entraîner des blessures ou la mort.
Tout contact avec les bornes de l’appareil peut causer un choc électrique
pouvant entraîner des blessures ou la mort.
Page 11
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
WARNING
AVERTISSEMENT
CAUTION
ATTENTION
CAUTION
ATTENTION
CAUTION
ATTENTION
CAUTION
ATTENTION
CAUTION
ATTENTION
Other Safety Marks (Sheet 2 of 2)
Preface
General Information
ix
Use of this equipment in a manner other than specified in this manual
can impair operator safety safeguards provided by this equipment.
Have only qualified personnel service this equipment. If you are not
qualified to service this equipment, you can injure yourself or others, or
cause equipment damage.
This device is shipped with default passwords. Default passwords should
be changed to private passwords at installation. Failure to change each
default password to a private password may allow unauthorized access.
SEL shall not be responsible for any damage resulting from unauthorized access.
Equipment components are sensitive to electrostatic discharge (ESD).
Undetectable permanent damage can result if you do not use proper
ESD procedures. Ground yourself, your work surface, and this equipment
before removing any cover from this equipment. If your facility is not
equipped to work with these components, contact SEL about returning
this device and related SEL equipment for service.
Use of controls or adjustments, or performance of procedures other
than those specified herein, may result in hazardous radiation exposure.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
L’utilisation de cet appareil suivant des procédures différentes de celles
indiquées dans ce manuel peut désarmer les dispositifs de protection
d’opérateur normalement actifs sur cet équipement.
Seules des personnes qualifiées peuvent travailler sur cet appareil. Si
vous n’êtes pas qualifiés pour ce travail, vous pourriez vous blesser avec
d’autres personnes ou endommager l’équipement.
Cet appareil est expédié avec des mots de passe par défaut. A l’installation, les mots de passe par défaut devront être changés pour des mots
de passe confidentiels. Dans le cas contraire, un accès non-autorisé á
l’équipement peut être possible. SEL décline toute responsabilité pour
tout dommage résultant de cet accès non-autorisé.
Les composants de cet équipement sont sensibles aux décharges électrostatiques (DES). Des dommages permanents non-décelables peuvent
résulter de l’absence de précautions contre les DES. Raccordez-vous correctement à la terre, ainsi que la surface de travail et l’appareil avant
d’en retirer un panneau. Si vous n’êtes pas équipés pour travailler avec
ce type de composants, contacter SEL afin de retourner l’appareil pour
un service en usine.
L’utilisation de commandes ou de réglages, ou l’application de tests de
fonctionnement différents de ceux décrits ci-après peuvent entraîner
l’exposition à des radiations dangereuses.
Les changements ou modifications qui ne sont pas expressément
approuvés par l'autorité responsable de se prononcer sur la conformité
pourraient annuler le pouvoir de l'usager à actionner l'équipement.
Connect only 120 Vac nominal to the SEL-734W socket stab VOLTAGES con-
nector.
Ground the SEL-734W Capacitor Bank Control cabinet chassis before
making any other connections to the cabinet.
General Information
Trademarks
All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL trademarks may be used
without written permission.
Trademarks appearing in this manual are shown in the following table.
SEL Trademarks
ACSELERATOR QuickSet
Connecter seulement 120 Vca nominal au connecteur de prise VOLTAGES
(Tensions) du SEL-734W
Mettre à la terre le châssis de l'armoire du Contrôle de batterie de condensateurs SEL-734W avant de faire toute autre connexion à l'armoire.
®
SELOGIC
®
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
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x
Preface
General Information
Technical Support
We appreciate your interest in SEL products and services. If you have questions
or comments, please contact us at:
Schweitzer Engineering Laboratories, Inc.
2350 NE Hopkins Court
Pullman, WA 99163-5603 U.S.A.
Tel: +1.509.338.3838
Fax: +1.509.332.7990
Internet: selinc.com/support
Email: info@selinc.com
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
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SEL-734W and SEL Wireless Current SensorInstruction Manual
Introduction and Specifications
Overview
SECTION 1
Figure 1.1 SEL-734W and SEL-WCS Capacitor Bank Control System
The SEL-734W Capacitor Bank Control pairs with SEL Wireless Current Sensors (WCS) to provide capacitor bank control for distribution systems. The system uses an SEL-WCS to measure current and a control power transformer
(CPT) to measure voltage. It uses the measured quantities to operate a set of
capacitor banks. The system helps improve power factor, provides VAR support,
and improves the voltage profile by inserting or removing the capacitor bank
from the distribution system. The system ultimately helps reduce line losses
because of reactive power consumption and increases system capacity.
The SEL-WCS is a line-powered device that measures current. The single shotgun-style hot stick installation and clamping mechanism allows for a quick
installation that firmly attaches the sensor onto an overhead conductor. The
SEL-WCS wakes up periodically, measures current (rms), computes harmonic
content up to the 15th harmonic, and transmits the data to the SEL-734W.
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
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1.2
Introduction and Specifications
System Features and Benefits
The SEL-734W processes data from one or three SEL-WCS devices and from the
CPT to implement a variety of cap bank control strategies. The SEL-734W uses
current measured independently from three SEL-WCS devices and one measured
voltage to provide three-phase switching decisions and monitoring. For this
application, the SEL-734W creates the other two voltage phases of equal magnitude to the measured phase, but at 120 and –120 degrees rotation relative to the
measured phase.
The SEL-734W continuously samples voltage on the power lines (via post-line
sensor or a single-phase CPT) and receives data from the SEL-WCS devices.
Combining the data from the SEL-WCS and the voltage measurements, the
SEL-734W accurately measures the phase angle between the system voltage and
the current. The SEL-734W uses both the measured voltage and the current
received from the SEL-WCS to calculate real and reactive power. The
SEL-734W computes other quantities such as power factor and total harmonic
distortion by using the received data from the SEL-WCS along with the measured voltage.
System Features and Benefits
The SEL-734W and SEL-WCS system measures voltage from a CPT (or line
post sensor) and currents to make switching decisions for a variety of advanced
control strategies such as VAR, current, and power factor. The SEL-WCS sends
data periodically to the SEL-734W. The SEL-734W uses the received data along
with measured voltage from the CPT to compute the quantities that allow the
SEL-734W to make switching decisions, provide metering information and
power quality information, and store events and load profiles. Additional control
strategies include voltage and time-of-day.
A
B
C
N
Control Power
Transformer
Figure 1.2 System Overview
WCS_A
WCS_B
WCS_C
Capacitor
Bank
Three-Phase
Capacitor Bank
Switch
SEL-734W
The SEL-734W and SEL-WCS system measures one voltage and three currents
from the SEL-WCS devices to provide three-phase switching decisions and monitoring.
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Page 15
Product Overview
Shotgun Stick Loop
Current Transformer
Twistlock Housing
for Setting Access
Omnidirectional Antenna for
the Radio Transmitter
Control (DIP)
Switch Bank
Spring for Secure Installation
SEL-WCS Product Overview
Figure 1.3 depicts the key components of the SEL-WCS. Each SEL-WCS
mounts onto and monitors the line current on one phase. The SEL-WCS periodically sends the load data information, including the harmonics, to an SEL-734W.
Introduction and Specifications
Product Overview
1.3
Figure 1.3 SEL-WCS Key Components
Shotgun Stick Loop and Spring
The shotgun stick loop and the spring simplify installation on overhead lines and
hold the SEL-WCS in position. See SEL-WCS for more information.
Current Transformer (CT)
The SEL-WCS split-core CT harvests energy to power the device and accurately
measures line current and harmonics of the current.
Integrated Radio
The 900 MHz radio module is mounted inside the SEL-WCS cone for environmental protection. The radio communicates to an SEL-734W to transmit line
data.
Control (DIP) Switches
The control (DIP) switches inside the housing allow easy selection of the identification of each sensor. An SEL-WCS has a set of four control (DIP) switches for a
network ID, two control (DIP) switches for a phase ID, and a single control (DIP)
switch that determines whether an SEL-WCS sends the harmonic content information to the SEL-734W. Sending harmonics requires more energy, so the time
between updates is greater if you configure the sensor to send harmonics.
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
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1.4
Introduction and Specifications
SEL-734W Overview
SEL-734W Overview
SEL-734W Front Panel
This section describes the general front-panel functionality of the SEL-734W.
The function of front-panel LEDs and pushbuttons are factory-programmed.
Blank labels shipped with the device can be used to indicate new functionality.
Figure 1.4 depicts the front panel of the SEL-734W with default labels installed
on the standalone device.
Figure 1.4 SEL-734W Front Panel Overview
ENABLED LED
This LED shows the diagnostics status of the SEL-734W. An illuminated
ENABLED LED indicates that the SEL-734W is operating properly. If the ENABLED
LED turns off, the SEL-734W requires service.
Configurable LEDs and Pushbuttons
All front-panel LEDs, except for the ENABLED LED, are configurable. The
SEL-734W has four control pushbuttons and one RESET button. Custom labels on
the front panel and settings in the device define the functionality of the pushbuttons and LEDs. Refer to the SEL-734W
Guide for details on the functionality of the capacitor bank control program.
Test Front-Pane l LEDs
Press the RESET button to illuminate all front-panel LEDs for testing. This pushbutton is configurable and performs other functions for capacitor bank control.
Refer to the SEL-734W Template Reference Guide for details on the programmed
functionality of the RESET pushbutton.
ACSELERATOR QuickSet Design Template
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Page 17
Menu Pushbuttons
The menu pushbuttons provide access to the front-panel menu and are not configurable. You can use the menu to perform the following tasks:
➤ View the status and diagnostics of the SEL-734W
➤ View metering data
➤ View and change device settings
➤ View event data
Model, Options, and Accessories
Models
The SEL-734W is the model number for the wireless capacitor bank control.
You can select options for a 15 V accessory power supply as well as options for
one or three SEL-WCS devices.
The SEL-WCS model number is SEL-8340. There are presently no configurable
options for the SEL-8340.
Introduction and Specifications
SEL-734W Overview
1.5
Accessories
Accessory Part Number
EIA-232 to USB Communications Cable Refer to the online MOT or contact an
SEL representative or CSR for ordering
information.
Pole Mounting Straps (9.375–12.25 inches) 915900448
Socket-Base Compact Enclosure Locking Ring 915900302
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Page 18
1.6
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5 200 400 600 800 1000
+/– % Error
Amperes rms
Mag Error
0
1
2
3
4
5
6
7
8
9
10
5 100 200 300 400 500 600 700 800 900 1000
+/– Degrees Err or
Amperes rms
Degr ees Err or (Sin gle Phas e)
0
1
2
3
4
5
6
7
8
9
10
5 100 200 300 400 500 600 700 800 900 1000
+/– Degrees Err or
Amperes rms
Degrees Error (3-Phase)
Introduction and Specifications
SEL-WCS Specifications
SEL-WCS Specifications
Compliance
Designed and manufactured under an ISO 9001 certified quality
management system
General
Operating Temperature
–40° to +85°C (–40° to +185°F)
Storage Temperature
–40° to +85°C (–40° to +185°F)
Operating Environment
Pollution Degree: 2
Relative Humidity: 5%–95%, noncondensing
Maximum Altitude: 2000 m
Ingress Protection
IP67
Clamp Range (SEL WCS)
6.35 mm to 31.75 mm (0.25 in to 1.25 in)
Dimensions
141.7 mm diameter x 177.0 mm height (5.58 inch diameter x 6.97 inch height)
Weight
Wireless Current Sensor: 0.85 kg (1.9 lb)
Overvoltage
Category III
Insulation Class
Class III
System
Power System Frequency Range
45–65 Hz
Typical Update Period vs Line Current (See
Load Magnitude and Phase Measurement Accuracies
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Ta bl e 5. 1
Maximum Voltage
38 kV (L-L)
Maximum Steady-State Load Current
1000 A (Thermal Rating)
Maximum Fault Current
25 kA for 10 cycles
Power
Minimum Load Current
2A
Radio System
Frequency Band
902–928 MHz ISM band (U.S.A, Canada)
SEL WCS
TX Power (Effective Isotropic Radiated Power)
50 mW (17 dBm) peak,
40 mW (16 dBm) typical
Modulation
)
FSK
Link Range
1,500 ft line-of-sight
Type Tests
Electromagnetic Compatibility Emissions
Radiated: 47 CFR Part 15.109
Electromagnetic Compatibility Immunity
Electrostatic Discharge: IEC 61000-4-2:2008
Radiated: IEEE C37.90.2-2004
Conducted: IEC 61000-4-6:2008
Power Frequency Magnetic
Field:
Class A
IEEE C37.90.3-2001
Discharges:
Indirect: ±8 kV
Contact: ±8 kV
Air: ±15 kV
20 V/m
>35 V/m
10 V
80% 1 kHz sine wave modulation
; 80 MHz to 1 GHz
rms
with 80% 1 kHz sine wave
rms
modulation
; 150 kHz to 80 MHz
rms
IEC 61000-4-8:2009
100 A/m; 50/60 Hz; 60 s
1000 A/m; 50/60 Hz; 1–3 s
Page 19
Environmental
Cold: IEC 60068-2-1:2007
Cold Profile Ad; –40°C; 16 hours;
operational
Dry Heat: IEC 60068-2-2:2007
Dry Heat Profile Bd; +85°C; 16 hours;
operational
Damp Heat; Cyclic: IEC 60068-2-30:2005
Damp Heat Profile Db; +25° to +55°C;
relative humidity 93%; 6 cycles
Vibration: IEC 60255-21-1:1988
Class 1 Vibration Endurance
Class 2 Vibration Response
Shock and Bump: IEC 60255-21-2:1988
Class 1 Shock Withstand
Class 1 Bump
Class 2 Shock Response
Seismic: IEC 60255-21-3:1993
Class 2 Quake Response
SEL-734W Specifications
Introduction and Specifications
SEL-734W Specifications
Table 5 Certifications by Country
Country Authority Reference
U.S.A. FCC R34-900WCS
Canada IC 4468A-900WCS
1.7
Compliance
Designed and manufactured under an ISO 9001 certified quality
management system
General
Frequency and Rotation
60/50 Hz system frequency must be specified at time of order. ABC/
ACB phase rotation is user settable.
Frequency tracking range: 45 to 65 Hz
required for frequency tracking).
(V
A
Power Supply
Continuous Operating Limits
125/250 Volt Supply: 85–264 Vac (50/60 Hz)
VA Rating: <40 VA/15 W maximum
Interruption (IEC 60255-11:1979)
100 ms at 250 Vac/Vdc
50 ms at 125 Vac/Vdc
Ripple (IEC 60255-11:1979): 5% for dc inputs
Terminal Voltage Dropout: <40 V within 1 minute of power removal
Rated Insulation Voltage
(IEC 60664-1:2002): 300 Vac
Dielectric Test Voltage: 2.8 kVdc
Rated Impulse Voltage
(IEC 60664-1:2002): 4000 V
85–275 Vdc
<20 VA/7 W typical
Radio System
SEL-734W Receiver Card
Antenna Connector: SMA, 50
RX Sensitivity (1% Error
Rate): –85 dBm
15 Vdc Integrated Power Supply
Continuous Operating Limits
Rated Input Voltage: 110–240 Vac (50/60 Hz)
110–250 Vdc
Input Voltage Range: 85–264 Vac (50/60 Hz)
Input Current: <1 A at 85 Vac
Output Voltage: 15 Vdc ±5% for accessories, as power
Output Cur rent: 2.75 A for accessories, as power supply only
85–275 Vdc
<1 A at 85 Vdc
supply only
Ride-Through Performance (With a 25 W Auxiliary Load)
120 Vac Input:
125 Vdc Input:
50 ms
20 ms
Safety
Isolation Rating: 2.5 kVac minimum at 60 Hz
Insulation Rating: 300 Vrms (IEC 60664-2:2002)
Impulse Rating: 4 kVpk (1.2/50 µs per IEC 60664-1:2002)
Overvoltage Category: II (IEC 60664-1:2000)
Insulation Type: Reinforced for Input-to-Output
(IEC 60664-1:2000)
Basic for Input-to-Input
(IEC 60664-1:2000)
Compact Enclosure Output Contacts
Output ratings were determined with IEC 60255-23:1994, using the
simplified method of assessment.
Make Rating: 250 Vdc, 7.2 kVA (Cos theta = 1), 30 A
Carry: 8 A at 120 Vac, 50/60 Hz
Durability: >100,000 cycles for:
Pickup/Dropout Time: <35 ms
Maximum Operating
Voltage: 240 V
Rated Insulation Voltage: 300 V
per IEEE C37.90-1989
Three motor-operated switches as high as
1/4 HP each
Three solenoid-operated switches as high
as 12 A each
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Page 20
1.8
Introduction and Specifications
SEL-734W Specifications
Physical
Operating Temperature
SEL-734W Device: IEC 60068-2: –40° to +85°C
LCD: –20° to +70°C (–4° to +158°F)
Device in Compact Enclosure With Integrated 15 Vdc Power Supply
0 W of Accessories: –40° to +65°C (–40° to +149°F)
15 W of Accessories: –40° to +60°C (–40° to +140°F)
40 W of Accessories: –40° to +50°C (–40° to +122°F)
Without Direct Sunlight: Increase max. temperatures by 15°C (27°F)
Without Direct Sunlight: Increase max. temperatures by 15°C (27°F)
(–40° to +185°F)
Operating Environment
Pollution Degree: 2 (SEL-734W Device)
Maximum Altitude: 2000 m
Maximum Humidity: 95% RH
Dimensions
SEL-734W Device
Dimensions: 5.7" x 6.63" x 7.56"
Compact Enclosure Exterior
Dimensions: 13.7" x 11.8" x 8.0"
Weight
4-Jaw Compact Enclosure
Model:
8.8 kg (19.4 lb)
(including SEL-2401 and SEL-3060)
Dielectric Test
Voltage Inputs: 2.2 kVac for 1 s
Optoisolated Inputs and
Output Contacts: 2.2 kVac for 1 s
AC Power Supply: 3.11 kVdc for 1 s
Type Tests
Electromagnetic Compatibility Immunity
Surge Withstand Capability: IEEE C37.90.1-2002 Elec. Relays
Power Frequency Magnetic
Field Immunity:
Pulse Magnetic Field
Immunity: IEC 61000-4-9:1993, 1000 A/m
Electrostatic Discharge
Immunity:
Radiated Immunity: IEC 61000-4-3:2010
2.5 kV oscillatory, 4 kV fast transient
IEC 60255-22-1:2007
2.5 kV peak common, 2.5 kV peak
differential mode, 1.0 kV peak common
mode on communications ports
IEC 61000-4-8:2009
1000 A/m for 3 seconds, 100 A/m for
1minute
IEC 61000-4-2:2008
Elec. disturbance, Section 2: ESD,
Severity Level: 4
IEC 60255-22-2:2008
Elec. disturb. Section 2: ESD, Severity
Level: 4; both polarities at Levels 1, 2,
3, and 4
Severity Level: X (15 V/m)
IEC 60255-22-3:2007
Elec. relays, Section 3: Radiated
electromagnetic field disturb., Severity
Level: 3 (10 V/m)
Conducted Radio Frequency
Immunity:
Fast Transient/Burst
Immunity:
IEC 61000-4-6:2008
Severity Level: 3
IEC 61000-4-4:2011
Severity Level: 4
Environmental Tests
Cold: IEC 60068-2-1:2007
Dry Heat: IEC 60068-2-2:2007
Damp Heat, Cyclic: IEC 60068-2-30:2005
Enclosure Protection: IEC 60529:2001, IP45
Seismic (Compact Enclosure
Only):
Radiated Emissions: FCC Part 15; Class A
Envir., Test Ad, Severity: 16 hours
at –40°C
Envir., Part 2: Test Bd
SEL-734W device, Severity: 16 hours at
+85°C
Device in Cabinet, Severity: 16 hours at
+70°C
Basic envir., Part 2: Test Db
Severity: 25° to 55°C, 6 cycles,
95% humidity
IEC 60255-21-3:1993
Class 2 Response (Method A)
Safety
Dielectric Strength/Impulse: IEC 60255-5:2000
High-Voltage Line Surges
SEL-734W Device: IEC 61000-4-5:2005
SEL-734W in Compact
Socket-Based Enclosure:
Impulse Voltage Test: IEC 60060-1
Severity:
2500 Vac on analog inputs, contact inputs,
and contact outputs
3100 Vdc on power supply
Level 4 (4 kV) on LEA voltage
measurement inputs and power supply
inputs.
Level 2 (1 kV) on LEA current
measurement inputs and auxiliary
circuits
IEEE C62.41:2002
Location Category B (6 kV) on LEA
voltage measurement inputs and power
supply inputs
IEC 61000-4-5:2005
Level 2 (1 kV) on LEA current
measurement inputs and auxiliary
circuits
4 kV on power supply, ac current inputs,
and voltage inputs
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SEL-734W and SEL Wireless Current SensorInstruction Manual
Overview
Dimensions
SECTION 2
Installation
This section describes the dimensions of the SEL-734W, its enclosure, the
SEL-WCS, and steps to install the SEL-734W and SEL-WCS devices.
Figure 2.1 4-Jaw Socket-Based Enclosure Dimensions
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Page 22
2.2
Installation
Installations
Figure 2.2 SEL-WCS Dimensions
Installations
SEL-734W
Connections to Compact Enclosures
Figure 2.3 shows the rear of the socket-based enclosures. Ta bl e 2 .1 shows the
pinout of the socket stabs.
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Page 23
WARNING
Always follow local utility grounding
practices.
Figure 2.3 Rear of a Socket-Based Enclosure
Table 2.1 Socket Stab Configurations
1+CPT
2–CPT
3OPEN
4CLOSE
Installation
Installations
2.3
The following procedures describe the steps to install the SEL-734W enclosures.
Grounding the Enclosure
SEL recommends that the control power transformer serving the SEL-734W be
on the same pole as the SEL-734W, as shown in Figure 2.4. All connections to
the SEL-734W (e.g., ac supply from power transformer) must be routed in close
proximity to, and parallel with, the ground conductor path for adequate surge
protection. The connections and the ground path should be approximately equal
in length. Primary lightning arrestors should be installed at the capacitor and at
the control power transformer. All of these measures help reduce the possibility
of equipment damage because of high voltages from surges.
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Page 24
2.4
Installation
Installations
NOTE: Confirm that your cabinet
provides the correct ground-toneutral connection, or separation, as
required by your systems design.
SEL-WCS
Figure 2.4 SEL-734W Required System Grounding
In cabinets with a ground lug, the ground lug is bonded to the chassis ground of
the SEL-734W and all metal parts in the cabinet. The ground lug is not bonded to
system neutral (see note). It is vital that the cabinet ground be connected to the
local ground conductor through use of local utility practices.
Install the SEL-WCS on a distribution line by using an industry-standard shotgun
stick.
Step 1. Determine the normal direction of current flow. Plan to install the
SEL-WCS upstream from the capacitor bank with the attached arrow
label pointed downstream towards the capacitor. The sensors are
directional, so they must be oriented in this way to function properly.
Step 2. Use a shotgun stick to grasp the hook eye on the side of the SEL-WCS
and place the device on the line so that the opening hangs over the line.
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Page 25
Step 3. Apply slight downward pressure while pulling the shotgun stick
toward you until the device is closed around the line. The spring
mechanism should be pushed in so that it wraps around the line.
Installation
Installations
2.5
Step 4. Apply slight upward pressure until the device is secured around the
line as shown.
Step 5. Use the shotgun stick to adjust the transmitter orientation so that it is
directly vertical. This is important to ensure the best propagation
characteristics for the internal antenna. Check that the CT is solidly
closed around the conductor.
Installation Recommendations
For single SEL-WCS installations, use the following steps:
Step 1. Use the control (DIP) switches of the Phase Identification setting to
configure the SEL-WCS as Phase A. See Section 2: Installation for
SEL-WCS setting details.
Step 2. Install the SEL-WCS on the same power line where the CPT (or volt-
age sensor) is installed.
Determine the current direction of normal power flow, and install the
sensor upstream of the capacitor bank with the arrow pointed
downstream towards the capacitor bank.
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Page 26
2.6
Installation
Getting Started
NOTE: If you attempt the TRI
command and any of the sensors do
not report a current reading, it is
possible that the sensor is either not
closed around the line, or the radio
does not have sufficient line of sight.
For three SEL-WCS installations, use the following steps:
Step 1. Use the control (DIP) switches of the Phase Identification setting to
configure one SEL-WCS as Phase A, another SEL-WCS as Phase B,
and the last one as Phase C.
Step 2. Install the Phase A SEL-WCS on the same power line where the CPT
(or voltage sensor) is installed.
Determine the current direction of normal power flow, and install the
sensor upstream of the capacitor bank with the arrow pointed
downstream towards the capacitor bank.
Step 3. Install the Phase B SEL-WCS on a second power line with the arrow
pointing downstream towards the capacitor bank. If your CPT is
attached to Phase A, and if you know which phase Phase B is, attach
the sensor to Phase B. To verify that the SEL-WCS is installed correctly, trigger an event using the TRI command. See the SEL-734
Instruction Manual for details.
Step 4. Retrieve the event and check the phase shift between the Phase B
voltage and current. Phase B current should be roughly +120 degrees
out of phase with Phase A, and it should be close to in-phase with the
Phase B voltage if Phantom Voltage is enabled. If the phase shift is
expected, the Phase B SEL-WCS is installed correctly.
If the phase shift is close to –120 degrees from Phase A, it is likely
that you have installed it on the incorrect line. Remove the sensor and
install it on the other line.
Step 5. Install the Phase C SEL-WCS on the last power line.
Getting Started
An SEL-734W ordered in an enclosure comes with a pre-installed design template. The template is also available on the SEL website. For more information,
see the SEL-734W Template Reference Guide, and Section 3: PC Software of the
SEL-734 Instruction Manual.
Methods to Verify Wireless Current Sensor Communications
This procedure explains how to check the metered values through different interfaces.
From the Front Panel
Step 1. Press ENT on the front panel of the SEL-734W.
Step 2. Select
Step 3. Select
Step 4. Scroll through the menu to view the instantaneous measurements.
Meter and press ENT.
Instantaneous and press ENT.
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Page 27
Using a Terminal Program
See Section 3: PC Software of the SEL-734 Instruction Manual on how to use
ACSELERATOR QuickSet SEL-5030 Software.
Step 1. Establish communication to the SEL-734W.
Step 2. Select the QuickSet Terminal icon on the header ribbon, or open a
terminal program and establish SEL ASCII communication to the
device.
Step 3. Enter Access Level 1.
a. Enter the ACC command.
b. When prompted, enter the ACC password. The default password
Step 4. Enter the MET command. The SEL-734W will report the instanta-
neous voltage, current, and power.
Using QuickSet HMI
Step 1. Open the QuickSet HMI.
Step 2. Navigate to the
the instantaneous voltage, current, and power.
is OTTER.
Installation
Getting Started
Instantaneous window. The SEL-734W will report
2.7
From the Front Terminal
Use a handheld volt meter connected to the front terminal test jacks to test the voltage.
Close and Open the Capacitor Bank From the Front Panel
The SEL-734W ships with the Manual mode enabled by default. Manual mode
allows you to operate the capacitor bank from the front panel.
Step 1. Press the MANUAL pushbutton to ensure that Manual mode is enabled.
You will know that Manual mode is enabled because the MANUAL
LEDs illuminate.
Step 2. Press the CLOSE pushbutton. The CLOSE COMMAND LED should start
flashing and the front-panel LCD should show the delayed time to
close. Once the countdown reaches 0, the controller will close the
capacitor bank.
Step 3. Verify that all three switches closed.
Step 4. Press the OPEN pushbutton. The OPEN COMMAND LED should start
flashing and the front-panel LCD should show the delayed time to
open. Once the countdown reaches 0, the controller will open the
capacitor bank.
View the Sequential Events Recorder
After the controller operates the switches for the first time, you should view the
Sequential Events Recorder (SER). Follow the instructions below to view the
SER from the QuickSet HMI.
Step 1. Open the QuickSet HMI.
Step 2. Navigate to the SER window.
Step 3. Choose the date range as appropriate.
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Page 28
2.8
Installation
Getting Started
Validate SER
Step 4. Select the Update SER button. QuickSet will poll the data from the
SEL-734W and show the data in the window. QuickSet reports the
SEL
OGIC element name in the SER report. Refer to the appropriate
design template guide to determine the function of the SEL
OGIC ele-
ment used for capacitor bank control. You can also complete the next
steps to view an aliased SER report.
Step 5. Select the Aliased SER button to view an aliased SER report. This
shows the SEL
OGIC element function, instead of the SELOGIC
element name, to the capacitor bank control algorithm. Please refer
to your design template guide for further details.
After the controller operates the bank for the first time, the sequence of events
will be stored in memory. View the SER records as shown in the previous section,
then use the following guidelines to ensure that the controller operated the capacitor bank properly.
The enclosure contains one open contact and one close contact to control one
three-phase switch that is electrically connected. The enclosure does not connect
to the switch auxiliary contacts. Use the following guidelines to ensure the controller operates the switches properly.
➤ Verify output contacts operate properly.
➤ Ensure each output contact remains asserted for the configured
duration.
➤ After each operation, ensure the SEL-734W indicates the proper
switch status.
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SEL-734W and SEL Wireless Current SensorInstruction Manual
SECTION 3
Applications
Single-Phase Measurement and Ganged Switching
Figure 3.1 shows a single-measurement and ganged switching application. The
SEL-734W uses one measured voltage, such as from a CPT, and one SEL-WCS
to make switching decisions and provide power system monitoring.
WCSA
B
C
N
Capacitor
Bank
Control
Power
Transformer
Figure 3.1 Single-Phase Application
SEL-734W
Three-Phase Measurements and Ganged Switching
Figure 3.2 shows a three single-measurement and ganged switching application. The
SEL-734W uses one measured voltage, such as from a CPT, and three SEL-WCS
devices to make three-phase switching decisions and provide power system monitoring.
A
B
C
N
WCS_A
WCS_B
WCS_C
Capacitor
Bank
Three-Phase
Capacitor Bank
Switch
Three-Phase
Capacitor Bank
Switch
Control Power
Transformer
SEL-734W
Figure 3.2 Three-Phase Application
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Page 31
SEL-734W and SEL Wireless Current SensorInstruction Manual
Overview
SECTION 4
SEL-734W
The SEL-734W is a capacitor bank controller that controls the operation of
capacitor bank switches on three-phase power systems. The SEL-734W comes
with a pre-installed template that supports the following automatic control strategies:
➤ Voltage control
➤ kVAR control
➤ Current control
➤ Time-based control
➤ Power factor control
The controller also supports the following features:
➤ Separate close and open delay timers for different control strategies
➤ Logic to detect long-term unstable conditions (known as hunting)
and disable automatic control
➤ Adaptive voltage and kVAR processing to adjust capacitor switching
thresholds and minimize hunting
➤ Delay between operations to minimize the chance of short-term hunting
➤ DNP3 communications for remote SCADA control and monitoring
➤ Manual control of the capacitor banks
➤ Front-panel displays and LEDs that indicate the state of the controller
➤ Front-panel configuration
➤ Integrated 15 Vdc power supply for accessories (optional)
ACSELERATOR QuickSet SEL-5030 Software design templates configure the
SEL-734W for capacitor bank control. Design templates are customized software
interfaces that allow you to configure the threshold, time-delay, alarms, warning,
and communications settings for capacitor bank control. The enclosure connects
to a 120 Vac control power transformer (CPT) and a three-phase capacitor bank
switch. The SEL-734W uses SEL-WCS devices to measure current quantities.
All connections to the primary equipment are made through socket stabs located
on the back of the enclosure.
Capacitor Bank Control
This section describes the operations and the functionality provided by the
SEL-734W pre-installed template. For more detail, see the SEL-734W Template
Reference Guide.
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Page 32
4.2
SEL-734W
Capacitor Bank Control
Modes of Operations
Settings
The controller operates the capacitor switch based on the active mode of operation. The following list gives a brief description of each mode of operation.
MANUAL. Manual mode prevents all automatic and remote control operations and enables control from the front-panel pushbuttons.
AUTO. Auto mode enables automatic operations and prevents control from
the front-panel pushbuttons.
SCADAL. SCADA mode enables remote control operations and disables
automatic operations and control from the front-panel pushbuttons.
AUTO/SCADA Safety Time. The controller has a safety timer that delays
all operations for 15 seconds after the controller enters the AUTO or
SCADA mode from the Manual mode. The respective LED flashes while the
safety timer is active, during which the controller prevents switch operation,
allowing personnel to vacate the area.
Figure 4.1 shows an SEL-734W. The orange rectangle in the figure indicates the
switches where you make the different settings from those on the SEL-734B.
Figure 4.1 SEL-734W
SEL-734W Settings
The Network ID must match the Network ID setting for the SEL-WCS devices
used with this SEL-734W. The following sections explain the other settings on
the SEL-734W.
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Page 33
Front-Panel Operations
Voltage Phases
The Voltage Phases setting is used to allow the SEL-734W to calculate power,
VAs, and VARs for all three phases when the SEL-734W is only sensing a singlephase voltage. This is done by reusing the magnitude of the measured voltage
phase, but rotating by ±120 degrees to get the two missing voltage phases. SW1
of the system setting control (DIP) switches sets this option. When the switch is
moved to the down position, the SEL-734W only has single-phase data available.
Distance to Sensor
The Distance to Sensor setting is used to ensure that an SEL-734W does not hear
data from an SEL-WCS on the system that has reused the Network ID of the
SEL-WCS associated with this SEL-734W. This happens where there are more
SEL-734W enclosures in a limited area than the 16 available Network IDs.
Although unlikely, under ideal conditions, an SEL-734W can receive data from
an SEL-WCS that is farther than a mile away. This setting reduces the sensitivity
of the SEL-734W radio receiver so it will not receive data from distant
SEL-WCS devices. For most installations that do not require distance greater
than 200 feet, this should be set to low to avoid creating unnecessary RF noise,
which can overdrive the receiver.
SEL-734W
4.3
Line Current Range
The Line Current Range setting refers to the maximum current expected to flow
in the line during normal (non-fault) conditions. It is used to increase the resolution of the current reported to the SEL-734W. When greater than the 200 A
range, the resolution is approximately 0.25 A. For the lower range setting, the
resolution is approximately 0.05 A.
Figure 4.2 SEL-734W DIP Switch Settings
Front-Panel Operations
LEDs
Table 4.1 describes the behavior of the six front-panel LEDs. See the explanation
of the pushbutton LEDs in Pushbuttons.
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
Page 34
4.4
SEL-734W
Front-Pa ne l Ope rations
Pushbuttons
Table 4.1 Front-Panel LED Descriptions
LED Label Message Description
CONTROL VOLTAGE
ADAPTED VOLT/VAR
N/A
HUNTING
CAP DISCHARGING
LOCKOUT
➤ Illuminates when the voltage is within the voltage control band.
➤ Flashes when the voltage is outside of the voltage control band.
➤ Extinguishes when the voltage falls below the voltage inhibit
threshold or rises above the overvoltage trip threshold.
➤ Illuminates when the AVAR processing is active. Refer to
SEL-734W Template Reference Guide for further details.
➤ Illuminates when the SEL-734W has not received an update
from the SEL-WCS for 5 minutes.
➤ Extinguishes when the SEL-734W starts receiving a current
update from the SEL-WCS.
➤ Illuminates when the hunting or hunting delay inhibits assert.
➤ Illuminates while the capacitor bank is discharging.
➤ Illuminates when any lockout condition is asserted.
➤ Flashes during the power-up inhibit time.
The following section explains the operation of the local pushbuttons.
RESET Pushbutton
Activate the Manual mode and hold the RESET pushbutton for three seconds to
reset the following features:
➤ Hunting latch
➤ Fault latch
➤ Lockout conditions
Press RESET to test all of the front-panel LEDs.
CLOSE and OPEN Pushbuttons
These pushbuttons initiate a local capacitor bank switch operation. The controller
delays the operation by the time defined by the Local Close Delay and Local
Open Delay settings. Two LEDs next to each pushbutton indicate the status of the
switch and pending operations. Each pushbutton has two associated LEDs. Both
LEDs indicate the state of the switch. A pending operation is indicated when
either the OPEN COMMAND LED is flashing and the OPENED LED is off, or the
CLOSED COMMAND LED is flashing and the CLOSED LED is off. Both LEDs flashing
for the OPEN or CLOSE pushbutton indicates that the controller is operating the
switch and that the OPEN or CLOSE output contact is asserted. A steady OPENED or
CLOSED LED indicates that the switch is open or closed.
To initiate a local close or local open operation, the controller must be in the
Manual mode and the following conditions must be met:
➤ Manual control mode is active
➤ Voltage is greater than the voltage inhibit threshold
➤ The power-up inhibit is not active
SEL-734W and SEL Wireless Current Sensor Field Reference Guide Date Code 20191029
Page 35
For close operations, the following additional conditions must be met:
➤ Voltage is less than the overvoltage trip threshold
➤ Harmonics content is less than the high-harmonic trip threshold
If these requirements are not met while the controller is counting down to the
operation, the controller will cancel the pending operation. Once you press the
OPEN or CLOSE pushbutton, the controller counts down to the time of the operation. The time delay is 30 seconds by default. You may change the countdown
time of the Local Close Delay and Local Open Delay settings anywhere from
5 to 60 seconds. During the countdown, the LCD displays the countdown time
and the OPEN COMMAND or CLOSE COMMAND LED flashes. To cancel the command,
press any pushbutton other than the pushbutton of the pending operation.
MANUAL Pushbutton
Press the MANUAL pushbutton to deactivate the SCADA and Auto modes and to
enable the Manual control mode. See Control Modes in the SEL-734W Template
Reference Guide for a description of the Manual control mode behavior.
AUTO/SCADA Pushbutton
SEL-734W
Power System Quantity Measurements
4.5
The AUTO/SCADA pushbutton activates the AUTO and SCADA modes and deactivates Manual mode. Depending on the state of the SCADA bit, this pushbutton
activates either AUTO or SCADA modes. See Control Modes in the SEL-734W
Template Reference Guide for a description of pushbutton behavior.
Power System Quantity Measurements
The SEL-734W uses measured voltage(s) and the current and harmonic quantities from the SEL-WCS to compute power system quantities such as apparent,
real, and reactive power, energy, power factor, and harmonic total distortions. For
a single-phase installation (one measured voltage and one measured current sent
by the SEL-WCS), the SEL-734W computes single-phase power system quantities and uses these single-phase quantities for metering and switching decisions.
For a three-phase installation, three SEL-WCS devices are required. The
SEL-734W measures only one phase and creates the other two voltage phases of
equal magnitude to the measured voltage but at +120 and –120-degree rotation
relative to the measured phase. The SEL-734W uses the voltages and currents
sent by the SEL-WCS devices for metering. The SEL-734W uses the power factor of Phase A for switching decisions. The SEL-734W uses either one of the
phases or the average of the three phases for current switching decisions. For
kVAR control and switching decisions, the SEL-734W uses either one of the
phases or three-phase reactive power.
The SEL-WCS transmits current magnitude intermittently. The SEL-734W interprets that data and creates a waveform that is recognized by the SEL-734W as an
analog signal. This means that all of your metered currents are reported as a perfect sin wave based on the last received rms value from the SEL-WCS. See
Section 6: Differences Between the SEL-734B and the SEL-734W for details.
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Page 37
SEL-734W and SEL Wireless Current SensorInstruction Manual
Overview
SECTION 5
SEL-WCS
NOTE: The SEL-WCS transmits
current values lower than 5 A, but
transmissions will be more infrequent
and less accurate. The accuracy
specifications of the device assume a
minimum operating current of 5 A.
The SEL-WCS provides measurements of power line current, both the fundamental frequency and harmonic frequencies (up to the 15th). This is provided in a
package that is easy to mount using a hot stick and requires no wiring to the
capacitor bank control or to a power source. Power is harvested from the magnetic field surrounding the power line when current is flowing. The SEL-WCS
operates without use of a battery, getting rid of that maintenance concern while
allowing for a smaller, simpler device. The SEL-WCS measures the current and
updates the SEL-734W periodically, making sure that it has enough stored energy
to complete the measurement and transmit the information to the SEL-734W
before starting the measurement process. The SEL-734W provides a measurement range of 5 to 1000 A. The SEL-WCS is paired to an SEL-734W by settings
selections made on both devices.
Current Measurements
Measurements are made by the sensor and sent to the SEL-734W about once
every 1.2 seconds or as harvested energy allows, whichever is slower. The
SEL-734W will use the last value transmitted in all reporting, calculations, and
actions involving the current until the next update of the current. If the
SEL-734W has not received a recognizable update within a certain timeframe,
the current value is set to zero and stays at zero until the next successful update.
A switch-selectable setting for the SEL-WCS tells the sensor whether it should
calculate the magnitude and phase values of the harmonics. By selecting the
option for no calculation of the harmonics, the sensor will send updates more frequently when line current is below a certain value. Tab le 5 .1 compares typical
update periods with and without harmonics calculation for certain values of line
current.
Table 5.1 SEL-WCS Typical Update Period Versus Line Current
Line Current
(amperes rms)
5 4.1 12.5
10 2.0 5.7
20 1.1 2.0
50 1.1 1.4
100 1.1 1.3
Table 5.1 shows the approximate update rate versus current for certain values of
power line current. The update rate is given for two cases: fundamental current
measurement or fundamental and harmonic current measurements. The power
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
No-Harmonics Update
Period (seconds)
Harmonics Update Period
(seconds)
Page 38
5.2
SEL-WCS
Current Measurements
SEL-WCS Settings
Network ID settings
consumption by the processor to calculate the magnitude and angle of the harmonic frequencies means a slower update rate of power line current when said
line current is below 100 A.
The SEL-WCS has a 4-bit control (DIP) switch that allows it to configure the
Network ID. Table 5.2 shows the frequency associated with each Network ID.
Control (DIP) switches SW1–SW4 shown in Figure 5.1 are for the Network ID.
Table 5.2 Frequency Channels
Network ID Frequency (MHz)
1906
2907
3908
4909
5910
6911
7912
8913
9914
10 915
11 916
12 917
13 918
14 919
15 920
16 921
Figure 5.1 Control (DIP) Switch Configurations
Harmonic Content Control (DIP) Switch Setting
Control (DIP) switch SW7 configures the SEL-WCS, whether it calculates and
sends harmonic contents of the current to the SEL-734W.
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Phase Identification Settings
The SEL-WCS uses two control (DIP) switches (SW5 and SW6) to configure the
phase information. Tab le 5 .3 shows the phase identification settings.
Table 5.3 Phase Identification Configuration
Switch Settings (SW5, SW6) Phase
00 A
01 B
10 C
11 Reserved
SEL-WCS
Current Measurements
5.3
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SEL-734W and SEL Wireless Current SensorInstruction Manual
Overview
SECTION 6
Differences Between the
SEL-734B and the SEL-734W
The SEL-734B receives an analog representation of the current in the power line
being monitored. The analog signal is digitized in the SEL-734B. The digitization rate of the SEL-734B is fast enough that the system runs as if it is continuously varying data. The SEL-WCS samples the representation of the power line
current at a high rate, but only for the few cycles it requires to determine the state
of the current (amplitude and spectral content). The SEL-734W receives the
information and repeatedly uses it until a new update is received. The SEL-734W
supports all the same functions of the SEL-734B, such as metering, power quality
and event analysis, waveform capture, Sequence of Events (SOE) reporting, and
capacitor bank control operation. The degree to which each of these functions is
impacted is determined by how often the function updates relative to the update
rate from the SEL-WCS and how much the current changes between sensor
updates. Each of these functions is described in this section.
Capacitor Bank Control Strategies
The SEL-734B provides different capacitor bank control strategies and switching
options depending on its hardware options. See the SEL-734B Field Application
Guide and Template Guides for details. The template guides specify the list of
control strategies that are available for each hardware option. Table 6.1 compares
the control strategies between the SEL-734B and SEL-734W.
Table 6.1 SEL-734W and SEL-734B Control Strategy Comparison
Control Strategies Compact Enclosure
SEL-734W SEL-734B
4-Jaw 4-Jaw 6-Jaw Option A 6-Jaw Option B 7-Pin
Vol t age C on tr ol Yes Yes Ye s Yes Yes Yes
kVAR Control Yes No Yes Yes Yes Yes
Power Factor Control Yes No Yes Yes Yes No
Current Control Yes No Yes Yes Yes No
Time-Based Control Yes Yes Yes Yes Yes No
Ganged Phase Control Yes Yes Yes Yes Yes Yes
Individual Phase Control No No No No No Yes
Full-size
Enclosure
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
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6.2
Differences Between the SEL-734B and the SEL-734W
Metering
Metering
Both the SEL-734B and SEL-734W use the same calculation method to compute
metering quantities. The quantities include instantaneous, demand, energy, maximum and minimum, crest factor, and harmonics. The metering data provided by
both the SEL-734B and SEL-734W can be different whenever the SEL-734W
has an update and the current has changed since the last update. The SEL-734B
can capture more transient behavior than the SEL-734W. For a smooth load current, it is expected that both the SEL-734B and SEL-734W have similar metering
quantities.
Power Quality and Event Analysis
Because of the metering data differences between the SEL-734B and SEL-734W,
the power quality given by them are different. SEL does not recommend that the
SEL-734W be used as a revenue meter or a device that you expect to capture
quick changes or transients.
Both the SEL-734B and SEL-734W use the same methods and techniques to
generate event reports. The reports include waveform capture event reports,
Sequential Event Recorder (SER) reports, and voltage sag/swell/interruption
(VSSI) reports. See Section 6 in the SEL-734 Instruction Manual for details.
Waveform Capture Event Reports
Waveform capture, also known as oscillography, allows the SEL-734W to record
the voltage and current waveforms associated with programmable trigger conditions, such as a voltage interruption. The sample rate and duration of the waveform capture are predetermined by using Event Report settings. The supported
sample rate is 1 kHz. The 1 kHz sample rate contains harmonic content as far as
the 7th order.
The duration of the waveform capture can be set to 0.25 seconds or 15 cycles for
a 60 Hz system. Each waveform capture contains at least 4 cycles of pretriggered
data.
Although the SEL-734W can capture waveforms for 0.25 seconds, the measured
current waveform will likely remain constant during this interval because of the
SEL-734W update rates. It is possible to see a jump in the captured current waveforms if the SEL-WCS provides an update of the current values during this 0.25
second interval.
Sequence of Events (SOE) Report
Users program conditions (known as trigger settings) under which values are
logged to the Sequence of Events (SOE) report. If the line current is used as part
of a trigger setting, the trigger may be delayed based on when the SEL-WCS
update is received. If a transient in the current does not last long enough to be
captured by the SEL-WCS, no event capture will happen. For an event capture
that is triggered, the line current reported may not be the line current at the time
of the event. Keep these differences in mind when using the SEL-734W SER
reports for forensic analysis.
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SEL-734W and SEL Wireless Current SensorInstruction Manual
SECTION 7
Testing and Troubleshooting
Table 7.1 provides instructions for troubleshooting and common problems.
Table 7.1 Troubleshooting and Common Problems
Problem Solution
CLOSE or OPEN Button
Does Not Respond
➤ Check that the Manual mode is enabled. Press the MANUAL pushbutton to enable this mode.
➤ Check that the control power is healthy.
➢ Check that the control power fuse located on the inside of the enclosure has continuity.
➢ Check that 120 Vac is present. Refer to the enclosure wiring and check that 120 Vac voltage is pres-
➢ Check the front panel. Refer to the appropriate design template guide to check the SEL-734W indi-
➤ Check that an overvoltage does not exist. To protect the switches and the capacitor bank, the controller
will not close a switch if an overvoltage condition exists. Refer to SEL-734W Template Reference Guide
to check the SEL-734W lockout indicators.
ent between the control power fuse and neutral.
cators of control power.
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SEL-734W and SEL Wireless Current SensorInstruction Manual
APPENDIX A
Field Reference Guide Versions
Field Reference Guide
The date code at the bottom of each page of this field reference guide reflects the
creation or revision date.
Table A.1 lists the field reference guide versions and revision descriptions. The
most recent field reference guide version is listed first.
Table A.1 Field Reference Guide Revision History
Date Code Summary of Revisions
20191029 ➤ Initial version.
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
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SCHWEITZER ENGINEERING LABORATORIES, INC.
2350 NE Hopkins Court • Pullman, WA 99163-5603 USA
Phone: +1.509.332.1890 • Fax: +1.509.332.7990
www.selinc.com • info@selinc.com
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