Basler Electric BE1-50/51B-241 User Manual
INSTRUCTION MANUAL
FOR
OVERCURRENT RELAY
BE1-50/51B-241
Publication: 9252000792
Revision: D 08/14
9252000792 Rev D i
Preface
This instruction manual provides information about the installation and operation of the Overcurrent Relay
BE1-50/51B-241. To accomplish this, the following information is provided:
General information and specifications
Controls and indicators
Functional description
Installation and maintenance
Testing
Conventions Used in this Manual
Important safety and procedural information is emphasized and presented in this manual through
Warning, Caution, and Note boxes. Each type is illustrated and defined as follows.
Warning!
Warning boxes call attention to conditions or actions that may cause
personal injury or death.
Caution
Caution boxes call attention to operating conditions that may lead to
equipment or property damage.
Note
Note boxes emphasize important information pertaining to BE150/51B-241 installation or operation.
BE1-50/51B-241 Preface
ii 9252000792 Rev D
12570 State Route 143
Highland IL 62249-1074 USA
www.basler.com
info@basler.com
Tel: +1 618.654.2341
Fax: +1 618.654.2351
© 2014 by Basler Electric
All rights reserved
First printing: March 2010
Warning!
READ THIS MANUAL. Read this manual before installing, operating, or maintaining the Overcurrent
Relay. Note all warnings, cautions, and notes in this manual as well as on the product. Keep this
manual with the product for reference. Failure to follow warning and cautionary labels may result in
personal injury or property damage. Exercise caution at all times.
To prevent personal injury or equipment damage, only qualified personnel should install, operate, or
service this system.
Basler Electric does not assume any responsibility to compliance or noncompliance with national code, local code,
or any other applicable code. This manual serves as reference material that must be well understood prior to
installation, operation, or maintenance.
For terms of service relating to this product and software, see the Commercial Terms of Products and Services
document available at www.basler.com/terms.
It is not the intention of this manual to cover all details and variations in equipment, nor does this manual provide
data for every possible contingency regarding installation or operation. The availability and design of all features
and options are subject to modification without notice. Over time, improvements and revisions may be made to this
publication. Before performing any of the following procedures, contact Basler Electric for the latest revision of this
manual.
The English-language version of this manual serves as the only approved manual version.
Preface BE1-50/51B-241
9252000792 Rev D iii
Revision History
The following information provides a historical summary of the changes made to the BE1-50/51B-241
instruction manual (9252000792 Rev D). Revisions are listed in chronological order.
Manual
Revision and Date Change
–, March 2010
A, July 2011
B, September 2011
C, October 2012
D, August 2014
Initial release
Swapped the location of terminals 1 and 7 in all references
Updated the Active/Pickup Indicator description
Added the year of the IEEE listings in the General Information chapter
Changed the 50-B output terminals in all applicable illustrations from 10
and 7 to 1 and 7
Improved description of operating-current jumpers for the targets
Added note about relay compatibility in older CO relay applications
BE1-50/51B-241 Revision History
iv 9252000792 Rev D
Revision History BE1-50/51B-241
9252000792 Rev D v
Contents
General Information ...................................................................................................................................... 1
Features .................................................................................................................................................... 1
Specifications ............................................................................................................................................ 2
Controls and Indicators ................................................................................................................................. 7
Introduction ................................................................................................................................................ 7
Front Panel Controls and Indicators .......................................................................................................... 7
Circuit Board Controls ............................................................................................................................... 9
Functional Description ................................................................................................................................. 11
Introduction .............................................................................................................................................. 11
Function Block Descriptions .................................................................................................................... 11
Installation ................................................................................................................................................... 13
General .................................................................................................................................................... 13
Factory Settings ....................................................................................................................................... 13
Installation ............................................................................................................................................... 13
Connections ............................................................................................................................................. 13
Application Coordination .......................................................................................................................... 15
Maintenance ............................................................................................................................................ 16
Storage .................................................................................................................................................... 16
Testing ......................................................................................................................................................... 17
Introduction .............................................................................................................................................. 17
Dielectric Test .......................................................................................................................................... 17
Test Procedures ...................................................................................................................................... 17
Characteristic Curves .................................................................................................................................. 23
Introduction .............................................................................................................................................. 23
Instantaneous Overcurrent Characteristics ............................................................................................. 23
Time Overcurrent Characteristics ............................................................................................................ 24
Integrating Time Reset Characteristic ..................................................................................................... 40
BE1-50/51B-241 Contents
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Contents BE1-50/51B-241
9252000792 Rev D 1
Catalog Number
Curve Type
CO-5 or COM-5
Long Time
CO-8 or COM-8
Inverse
Note
General Information
The BE1-50/51B-241 protective relay is a direct replacement for ABB/Westinghouse type CO and COM
relays housed in an FT-21 case. The BE1-50/51B-241 has a 5-ampere current sensing input. Compatibl e
ABB/Westinghouse model numbers are listed in Table 1.
Table 1. ABB/Westinghouse Relays Suitable for Direct Replacement
CO-2 Short Time
CO-6 or COM-6 Definite
CO-7 or COM-7 Moderately Inverse
CO-9 or COM-9 Very Inverse
CO-11 or COM-11 Extremely Inverse
If replacing a CO relay manufactured prior to 1966, please contact
Basler Electric to verify compatibility.
To replace an existing ABB/Westinghouse type CO or COM relay, perform the following steps.
1. Select the desired relay settings on your new BE1-50/51B-241 relay.
2. Remove the existing Westinghouse relay cradle.
3. Insert the new relay cradle.
4. Close the knife-blade switches.
5. Install the new Basler Electric replacement cover glass into existing cover and secure with t he
captive thumbnut.
The BE1-50/51B-241 relay is self-powered, compatible wit h 50 or 60 Hz power systems, and has three
protection elements: one time overcurrent (51) element and two instantaneous overcurrent (50) elements.
The 51 element offers timing characteristic curves similar to those used by GE IAC and Westinghouse
CO/COM relays.
Features
A wide range of pickup settings and front panel sele ct able time characteristics permit applications
involving coordination with fuses, reclosers, c ol d l oad pickup, motor starting, and fixed time requirements.
In addition, an integrating reset function is av ail able to simulate the disk reset of electromechani cal relays.
The BE1-50/51B-241 overcurrent relay has the following st andard features.
• Independent time and instantaneous elem ent s
• A secure method to manually trip the breaker at t he relay front panel
• Direct reading front panel controls
• Minimum pickup setting for safety during inst all ation
• Time characteristics extend to a pickup multiple of 40
• Rugged draw-out construction
• Gravity latching targets retain indication wit hout power
• Built-in accuracy eliminates internal adjustment s
• Minimum transient overreach
BE1-50/51B-241 General Information
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• Field selectable characteristic curve selection similar to GE IAC or ABB/Westinghouse CO/COM
type curves
• Field selectable instantaneous or integrat i ng reset
• Field selectable 50 or 60 Hz operation
• Field selectable 0.0 or 0.1 second, fixed, i nstantaneous delay
Internal switches provide for selecting syste m-operating frequencies of 50 or 60 Hz, instantaneous
element delays of 0.0 or 0.1 second, characteristi c curve group selection for either GE IAC or
Westinghouse CO/COM type curves, and inst antaneous or integrating reset characteristics. S witch
locations and descriptions are provided in the Controls and Indicators chapter.
Advantages
The BE1-50/51B-241 overcurrent relay has many advantages over other overcurrent relays. The primary
advantages are:
• Time characteristics are defined by equations and graphs
• Field selectable time characteristics
• Very low burden extends the linear range of the CTs
• Self-powered from the sensed current
• Continuous automatic calibration
The BE1-50/51B-241 overcurrent relay may be tested without removing the relay from the case. Shorting
contacts are provided for all current inputs whe n the connection plugs or relay chassis is remo ved f rom
the relay case.
Specifications
BE1-50/51B-241 electrical and physical specificat ions are listed in the following paragraphs.
Time Overcurrent (51) Element
Pickup
Setting Range: 0.5 to 15.9 Aac
Setting Increment: 0.1 Aac
Accuracy: Sum of ±2% and ±25 mAac
Dropout
Dropout occurs at 95% of pickup value.
Characteristic Curves
Available curve types follow IEEE Standard C37.112 (1996) and emulate standard GE IAC,
Westinghouse CO/COM, and BS142 curves. The Characteristic Curves chapter illustrates the available
curves and lists the applicable constants.
Curve Types: Short Inverse, Long Inverse, Definite Time, Moderately Inverse,
Inverse, Very Inverse, Extremely Inverse, BS 142 Very Inverse,
BS142 Extremely Inverse, Fixed Time
Time Multiplier: 11 curves for each characteristic
Timing Accuracy: ±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40
times tap and is for a given measured multiple of t ap.
Fixed Timing
Setting Range: 0.1 to 9.9 s
Setting Increment: 0.1 s
Timing Accuracy: ±1 cycle, ±2% of the time to trip for time dial settings ≥0.1
General Information BE1-50/51B-241
9252000792 Rev D 3
Reset
Integrating: Simulates the disk reset of electromechanical relays and begins
when the current decreases below 95% of pickup. The
Characteristic Curves chapter illustrates the integrating reset
characteristic curve and equation.
Instantaneous: Reset occurs within 16 ms of when the current decreases below
95% of the pickup level.
Instantaneous Overcurrent A (50-A) Element
Pickup
Setting Range: 2 to 99 Aac
Setting increment: 1 Aac
Accuracy: Sum of ±2% and ±25 mAac
Dropout
Dropout occurs at 95% of pickup value.
Time Delay
Switch selectable with no intentional delay (SW3-2 O FF ) or a f i xed delay of 100 ms (SW3-2 ON). The
Characteristic Curves chapter illustrates the characteristic curve for the 50-A and 50-B elements.
Instantaneous Overcurrent B (50-B) Element
Pickup
Setting Range: 1 to 15.9 Aac
Setting increment: 0.1 Aac
Accuracy: Sum of ±2% and ±25 mAac
Dropout
Dropout occurs at 95% of pickup value.
Time Delay
Fixed at no intentional delay. The Characteri stic Cur ves chapter illustrates the characteristic cu rves for
the 50-A and 50-B elements.
Reset Characteristic
Resets within 16 ms of when sensed current decre ases below the pickup level.
Current Sensing Input
Continuous Rating: 14 Aac∗
1 Second Rating: 400 Aac
∗ Continuous rating is 14 Aac for temperatures up to 45°C. See Figure 1 for de-rati ng curve.
BE1-50/51B-241 General Information
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Continuous Current
Current Sensing Input
0
2
4
6
8
10
12
14
16
-40 -20 0 20 40 60
Ambient Temperature (C)
Current (Aac)
BE1-50/51B-230 CT Burden
0
20
40
60
80
100
120
140
160
0 10
20 30 40 50
Input Current (Am ps)
Burden in VA (rms)
BE1-50/51B-241 CT Burden
Figure 1. Current Sensing Input Derating Curve (BE1-50/51B-241)
Burden
At 0.5 Aac: 2.8 Ω
At 5.0 Aac: 0.3 Ω
Figure 2 illustrates the current sensing input bu rden characteristic.
Figure 2. Current Sensing Input Burden (BE1-50/51B-241)
General Information BE1-50/51B-241
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Frequency Response
A change of ±5 Hz from the nominal 50/60 Hz current causes <0.5% change in the current required for
pickup.
Transient Response
<10% overreach with system time constants up t o 40 ms.
Harmonic Rejection
Rejection of odd and even harmonics is illustrated in Figure 3.
Figure 3. Harmonic Rejection
Target Indicators
A gravity-latched, manually-reset, current-operated target indicator is provided for the time-overcurrent
(51) trip output and the instantaneous overcurrent A (50-A) trip output. A target indicator is not provided
for the 50-B trip output. The level of trip circuit current required to operate each target is individually
controlled by a circuit board jumper. See the Controls and Indicators chapter for jumper locati ons and
function assignments
Target Operate Current
Jumper Position—Pins 1 and 2: Must operate ≥ 2.25 A; must not operate < 900 mA.*
Jumper Position—Pins 2 and 3: Must operate ≥ 200 mA; must not operate < 80 mA.*
∗ See Output Contacts for the maximum acceptable levels of trip circ ui t currents.
Output Contacts
Output contacts are surge protected and rated as follows.
Resistive Ratings
120/240 Vac: Make 30 amperes for 0.2 seconds, carry 7 amperes for 2
minutes, 3 amperes continuously, and break 5 am peres.
BE1-50/51B-241 General Information
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125/250 Vdc: Make 30 amperes for 0.2 seconds, carry 7 amperes for 2
minutes, 3 amperes continuously, and break 0.3 ampere.
Inductive Ratings
120/240 Vac, 125/250 Vdc: Make and carry 30 amperes for 0.2 seconds, carry 7 am peres for
2 minutes, 3 amperes continuously, and break 0.3 ampere. (L/R
= 0.04).
Terminal Assignments
51 Element: 1, 10
50-A Element: 2, 10
50-B Element: 1, 7
Type Tests
Isolation: IEEE C37.90-2005
Transient Surge: IEEE C37.90.1-2004
Radiated Interference: IEEE C37.90.2-2004
Electrostatic Discharge: IEEE C37.90.3-2006
Vibration: IEC 255-21-1
Shock and Bump: IEC 255-21-2
Environment
Operating Temperature: –40 to 70°C (–40 to 158°F)
Storage Temperature: –50 to 70°C (–58 to 158°F)
Physical
Weight: 4.3 lb (2.0 kg)
General Information BE1-50/51B-241
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F
G
H
I
A
B
C
D
E
P0061-01
Controls and Indicators
Introduction
The BE1-50/51B-241 relay controls and indicators are located on the front panel and circuit board.
Front Panel Controls and Indicators
Front panel controls and indicators are illustr at ed in Figure 4 and described in Table 2. The locators and
descriptions of Table 2 correspond to the locators sh own in Figure 4.
Figure 4. Front Panel Controls and Indicators
BE1-50/51B-241 Controls and Indicators
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Locator
Description
A
Time Overcurrent Time Dial Selector Switches. These two rotary switches select the
these switches corresponds to a time delay of 0.0 t o 9.9 seconds.
B
Curve Selector Switch. This ten position rotary switch selects one of nine inverse timing
details about BE1-50/51B-241timing characteristics.
C
Time Overcurrent Pickup Selector Switches. These two rotary switches select the time
selector switches while the relay is in service ma y ca use the relay to trip.
D
Target Indicators. Red target indicators latch when the corresponding set of trip contacts
indicators are reset by pressing the target reset button (locator G).
E
Instantaneous Overcurrent A Pickup Selector Switches. These two rotary switches sele ct
Note
F
Instantaneous Overcurrent Manual Trip Ja ck s. T hese jacks are used to manually trip a
These jacks do not activate the 50-B trip output contacts.
G
Target Reset Button. This button is pressed to reset the two, gravity-latched target
indicators (locator D).
H
Active/Pickup Indicator. This bicolor LED indicates the level of current sensed by the relay.
Note
I
Time Overcurrent Manual Trip Jacks. These j acks are used to manually trip a breaker
terminated with two standard 0.08 inch diameter phone-tip plugs, into the two jacks.
Table 2. Front Panel Controls and Indicators
desired curve of the timing characteristic selected by the Curve Selector Switch (locator B).
When a fixed time characteristic is used (Curve S el ector Switch setting of A), the setting of
characteristics or one fixed time function. Ref er to the Characteristic Curves chapter for
overcurrent pickup current setting in amperes ( UNITS and TENTHS). Adjusting these
closes and sufficient trip circuit current is detected. (The level of current that will trip each
target indicator is jumper-selectable. See Circuit Board Controls for more inform ation.) The
Time target indicates the flow of current in the time ov ercurrent (51) trip circuit. The Inst
target indicates the flow of current in the instantaneous overcurrent A (50-A) trip circuit. No
target is provided for the instantaneous over current B (50-B) trip circuit. Both target
the instantaneous overcurrent A (50-A) pickup current setting in amperes (UNITS and
TENTHS). Adjusting these selector switches whil e the relay is in service may cause the
relay to trip.
When testing time overcurrent functions, i nst ant aneous pickup
settings of 00 will affect the calibration of the t i m e functions. Time
pickup settings of 00 also affect instantaneous f unctions.
breaker controlled by the 50-A trip output cont acts. This is achieved by plugging a jumper
wire, terminated with two standard 0.08 inch diamet er phone-tip plugs, into the two jacks.
A green LED indicates that the relay is active but not picked up. The LED changes to red
when the sensed current exceeds the time overcu rre nt pickup setting and back to green
when the sensed current decreases below 95% of the time overcurrent pickup setting.
A minimum of 0.5 A (5A units) or 0.1 A (1A units) is required to light
the LED. The LED may not turn green (active) before turning red
(picked up) at the 0.5 A pickup setting on 5A units or 0.1 A pick up
setting on 1A units.
controlled by the 51 trip output contacts. This is achieved by plugging a jumper wire,
Controls and Indicators BE1-50/51B-241
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