Page 1
INSTRUCTION MANUAL
FOR
OVERCURRENT RELAY
BE1-50/51B-241
Publication: 9252000792
Revision: D 08/14
Page 2
Page 3
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
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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
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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
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iv 9252000792 Rev D
Revision History BE1-50/51B-241
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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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vi 9252000792 Rev D
Contents BE1-50/51B-241
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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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2 9252000792 Rev D
• 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
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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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9252000792 Rev D 5
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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6 9252000792 Rev D
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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9252000792 Rev D 7
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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9252000792 Rev D 9
A
B
C
SW10
SW9
P0061-07
Circuit Board Controls
Circuit board controls consist of two rotary selector switches, a four-position slide switch, and two
jumpers. Circuit board controls are illustrat ed i n Figure 5 and described in Table 3. The locators and
descriptions of Table 3 correspond to the locators sh own in Figure 5.
Figure 5. Circuit Board Controls
BE1-50/51B-241 Controls and Indicators
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Locator
Description
A
Target Operating Current Jumpers. Two user-adj ustable jumpers control the range of trip
must not operate < 80 mA.
B
Four Position Slide Switch. This switch assembly, designated SW3, has four independent
instantaneous reset characteristic.
C
Instantaneous Overcurrent B Pickup Selector Switches. These two screwdriver-adjusted,
B) pickup current setting in
SW10 setting positions consist of 0 through 9 which correspond to values of 0.0 to 0.9
Table 3. Circuit Board Controls
circuit current required to operate the time overcurrent (51) and instantaneous overcurrent
A (50-A) target indicators. Jumper J1 sets the minimum current range for the 50-A target
indicator and J2 sets the minimum current range for the 51 target indicator. Two jumper
positions are possible: across pins 1 and 2 or across pins 2 and 3. When the jumper is
installed across pins 1 & 2, the targets must operate ≥ 2.25 A and must
not operate < 900
mA. When the jumper is installed across pins 2 & 3, the targets must operate ≥ 200 mA and
slide switches designated SW3-1, SW3-2, SW3-3, and SW3-4. Each switch functions as
follows:
SW3-1 selects the nominal system frequency. The OFF position selects 60 Hz operation
and the ON position selects 50 Hz operation.
SW3-2 provides an additional time delay for the instantaneous overcurrent A (50-A)
element. The ON position provides an additional delay of 100 milliseconds.
SW3-3 selects either GE IAC or Westinghouse CO/COM t ype characteristic curves. The
ON position selects the GE IAC type curves (listed in Table 4) and the OFF position selects
the Westinghouse CO/COM type curves (listed in Tabl e 5).
SW3-4 selects either an instantaneous or integrating time reset characteristic. The ON
position selects an integrating reset characte rist ic and the OFF position selects an
rotary switches select the instantaneous overcurrent B (50amperes.
The 50-B pickup switches are accessed on the right side of the draw-out assembly by
removing the draw-out assembly from the case.
SW9 is a 16-position switch that sets the units portion (#.#) of the 50-B pickup setting in
amperes. SW9 setting positions consist of 0 through 9 which correspond to values of 0 to 9
amperes and A through F which correspond to values of 10 to 15 amperes. SW10 is a 10position switch that sets the tenths portion (#.#) of the 50-B pickup setting in amperes.
amperes.
The minimum allowable 50-B pickup setting is 1.0 Aac and the maximum allowable 50-B
pickup setting is 15.9 Aac. Adjusting the 50-B pickup selector switches while the relay is in
service may cause the relay to trip.
Example: SW9 position 2 and SW10 position 5 is a setting of 2.5 Aac.
Controls and Indicators BE1-50/51B-241
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9252000792 Rev D 11
Functional Description
Introduction
This section illustrates and describes the functional capabilities of the BE1-50/51B-241 relay.
Function Block Descriptions
BE1-50/51B-241 function blocks are illustrated in Figure 6 and described in the following paragraphs.
Figure 6. Function Block Diagram
Current Sensing Input
Single-phase ac current supplied by a system current transformer (CT) is applied to the BE1-50/51B-241
at terminals 8 and 9. Sensing current is applied t o i nt ernal power and signal CTs.
Power CT and Power Supply
The output of the power CT is supplied to the power supply which provides rectified and filtered ope rat i ng
power for all relay circuitry. A precision 5 Vdc outp ut of the power supply serves as a reference for
automatic calibration.
Signal Conditioning
Current from the signal CT is rectified and applied to three independent sets of scaling resi st ors controlled
by the Time Overcurrent (51), Instantaneous Overcurrent A (50-A), and Instantaneous Overc urrent B (50B) pickup switches. The analog-to-digital convert er receives the analog voltage developed acros s t he
scaling resistors and converts it into a digital signal that is supplied to the microprocessor.
Microprocessor
The microprocessor performs program ope rat i ons based on the sensed current, switch settings, and the
internal software program.
When sufficient current is sensed by the relay, the microprocessor is active and executing code, and the
Active/Pickup LED is green. When the sensed current decreases below the operating threshold,
microprocessor operation is interrupted and the Act ive/Pickup LED turns off. A watchdog circuit resets the
microprocessor program when code execution is int errupted.
BE1-50/51B-241 Functional Description
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12 9252000792 Rev D
Power-off sensing circuits measure the voltage across a capacitor at power-down and power-up. These
circuits determine how long power has been remo ved based on the difference voltage and the circuit’ s
RC time constant. This provides information f rom the integrating reset function even when power ha s
been entirely removed.
The microprocessor performs the program operations based on the inputs and the internal software
program. When the sensed current exceeds the TIME PICKUP setting, the ACTIVE/PICKUP LED turns
from green to red. The 50-A/51 contact is closed in accordance with the TIME characteristic equatio n or i f
the sensed current exceeds the INST PICKUP set ting. Likewise, sensed current exceeding the
Instantaneous Overcurrent B Pickup selector switch setting causes the 50-B Trip output contacts to close.
Outputs
Each protective element (time overcurrent (51), instantaneous overcurrent A (50-A), and instantaneous
overcurrent B (50-B) is equipped with a set of normally-open contacts rated for tripping duty. A sy st em
circuit breaker controlled by the 51 or 50-A output contacts can be manually tripped by connecting a
jumper across the Time Overcurrent Manual Trip jacks o r the Instantaneous Overcurrent Manual Trip
jacks. (Manual trip jacks are not provided for the system circuit breaker controlled by the 50-B output
contacts.) Current flow in a trip circuit is indicated by operation of the corresponding target. T he targets
will not operate without adequate relay operati ng power.
Warning!
Trip circuit voltage is present at the front panel trip j acks. When
shorting the trip jacks, use insulated jumpers to avoid contact with
these voltages.
Target Indicators
Gravity-latched, manually-reset, current-operated target indicators are 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. The minimum operating current range can be set for 80 to 200
milliamperes or 0.9 to 2.25 amperes. See the Controls and Indicators chapter for jumper lo cations and
function assignments.
Functional Description BE1-50/51B-241
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9252000792 Rev D 13
Note
Installation
General
When not shipped as part of a control or switchgear panel, the relays are shipped in sturdy cartons to
prevent damage during transit. Immediately upo n receipt of a relay, check the model and part number
against the requisition and packing list to see that t hey agree. Visually inspect the relay for damage that
may have occurred during shipment. If there is e vidence of damage, immediately file a claim with the
carrier and notify the Regional Sales Office, or contact the Sales Representative at Basler Electric,
Highland, Illinois.
Proper operation of the relay may be confirmed by performing the operational test procedures of the
Testing chapter. If the relay will not be installed immediately, store t he rel ay in its original shipping carton
in a moisture- and dust-free environment.
Factory Settings
BE1-50/51B-241 jumpers and internal switch SW3 are configured at the factory as follows:
• SW3-1: OFF (60 hertz operation).
• SW3-2: OFF (0.0 additional fixed delay for the instantaneous element).
• SW3-3: OFF (Westinghouse CO/COM type characteristi c c urves).
• SW3-4: ON (Integrating reset characteristics).
• J1 pins 2-3: 50-A minimum target operating curr ent of 80 to 200 mA
• J2 pins 2-3: 51 minimum target operating current of 80 to 200 mA
Installation
If replacing a CO relay manufactured prior to 1966, please contact
Basler Electric to verify compatibility.
Select the desired relay settings before putti ng the relay into service. Changing pickup current settings
while the relay is in service may cause tripping. Perf orm the following steps to install the BE1-50/51B-241
relay.
1. Select the desired relay settings on your new BE 1-50/51B-241 relay.
2. Remove the existing Westinghouse relay cradle.
3. Insert the new relay cradle and close the cradle l atches locking the relay into the case.
4. Install the cover by positioning the interlocking bracket at the top of the new Basler Electric cover
into the mating receptacle at the top of the cover adapter plate. Secure the captive fastene r at the
bottom of the cover.
Connections
Typical ac connections are shown in Figure 7. T ypical dc connections are shown in Figure 8.
BE1-50/51B-241 Installation
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14 9252000792 Rev D
Figure 7. Typical AC Connections
Installation BE1-50/51B-241
Page 23
9252000792 Rev D 15
KBD
CM
AD
T
N
T
++
−
=
028.0)202758.0(
110
27624.7
0938.2
+×+
−
×
=
Figure 8. Typical DC Connections
Application Coordination
In a typical application coordination scheme, a BE1-50/51B-241 is used to provide motor protection. An
electromechanical overcurrent relay with ext remely inverse timing provides protection for t he transformer
and bus. To improve coordination with the elect rom echanical relay, the BE1-50/51B-241 is configured
with the following settings:
• Integrating reset enabled (SW3-4 ON)
• Westinghouse CO/COM type curves selected (S W3-3 OFF)
The feeder reclosing relay is set for two reclo se at tempts at 3 and 15 seconds after the initial trip. I f a
permanent fault occurs (magnitude 10 times pickup), calculate the feeder breaker trip time for each of the
three operations. Refer to the Characteristic Curves chapter for the characteristic curve constants and
definition of the terms used in the following time characteristic curve equations.
From the time characteristic curve equat ion:
= 0.209 seconds
BE1-50/51B-241 Installation
Page 24
16 9252000792 Rev D
1
2
−
=
M
RD
T
R
seconds 15.5
10
2
7.75
2
−=
−
×
=
From the reset characteristic curve equation:
M equals 0 if current goes to zero. A negative result indicates reset time.
Result: Full trip = 0.209 seconds and full reset = 15.5 seconds if current goes to zero.
In Figure 9:
T
= 0.209 seconds (relay was at reset)
A
= value<TA because rewind has not gone to zero
T
B
= value<TA because rewind has not gone to zero
T
C
Figure 9. Coordination Timing Diagram
Maintenance
A BE1-50/51B-241 relay requires no preventive maintenance other than periodic checking of relay
connections to make sure that they are clean and tight . If the relay fails to function properly, contact
Basler Electric Technical Sales Support.
Storage
This device contains long-life aluminum electrolytic capacitors. For devices that are not i n service (spares
in storage), the life of these capacitors can be maximized by energizing the device for 30 minutes once
per year.
Installation BE1-50/51B-241
Page 25
9252000792 Rev D 17
Note
Testing
Introduction
Proper relay operation may be confirmed by performing the test procedures in this chapter.
Dielectric Test
In accordance with IEC 255-5 and IEEE C37.90-2005, one-minute diel ectric (high potential) tests may be
performed as follows:
• All circuits to ground: 2,828 Vdc or 2,000 Vac
• Input to output circuits: 2,828 Vdc or 2,000 Vac
Output contacts are surge protected.
Test Procedures
The following test procedures verify operati on of the BE1-50/51B-241 relay. The test setups illust rated in
Figures 10 through 12 are intended primarily as an illustration of the principals involved. Other test
equipment known to be capable of testing with the stated and implied tolerances (including equipment
designed specifically for testing protective relays) may be used.
The minimum test equipment requirements are:
• Current source with a range of 0 to 20 Aac (sensi ng input current)
• AC or DC voltage source (target operation)
• Timer or counter
To ensure proper timing during testing, remove t he current from the
relay for R times D seconds. (Refer to the Characteristic Curves
chapter for definitions of R and D.
When testing TIME overcurrent functions, INST PICKUP settings of 00
will affect the calibration of the TIME functions. TIME PICKUP settings
of 00 also affect INST functions.
Observe all applicable electrostatic discharge (E SD) precautions when
handling the relay assembly.
Time Overcurrent (51) Pickup
1. Connect and configure the relay for 51 pickup testing:
a. Connect the test setup shown in Figure 10.
b. Set circuit board switch SW3 as follows:
a. SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
b. SW3-2 = OFF (no additional time delay for the 50-A element)
c. SW3-3 = ON (Westinghouse CO/COM type characteristic curves)
d. SW3-4 = ON (integrating reset characteristic)
c. Set the TIME DIAL to 0.0.
d. Set CURVE to S.
BE1-50/51B-241 Testing
Page 26
18 9252000792 Rev D
e. Set TIME PICKUP to 0.5.
f. Set INST PICKUP (50-A) to 90.
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).
2. Apply and increase current to terminals 8 and 9 until t he A ct i ve/Pickup LED turns red. The applied
current should be no greater than 0.55 Aac.
3. Decrease the applied current until the Active/Pi ckup LED changes from red to green and then off.
4. Set TIME PICKUP to 2.2.
5. Slowly increase current to terminals 8 and 9 until the Active/Pickup LED turns red. The applied
current should be between 2.131 and 2.269 Aac.
6. Reduce the applied current to zero.
Time Dial
1. Connect and configure the relay for time dial test i ng:
a. Connect the test setup shown in Figure 10.
b. Set circuit board switch SW3 as follows:
SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (Westinghouse CO/COM type characteristic curves)
SW3-4 = ON (integrating reset characteristic)
c. Set TIME DIAL to 4.5.
d. Set CURVE to S.
e. Set TIME PICKUP to 1.0.
f. Set INST PICKUP (50-A) to 90.
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).
2. Prepare to apply 1.5 Aac to terminals 8 and 9 and reco rd the elapsed time from when current is
applied until the 51 output contacts close.
3. Apply the current (step from 0 to 1.5 Aac) and record t he elapsed time. The elapsed time should be
between 0.345 and 0.424 seconds. (This tolerance is greater than ±2% because it is the
accumulation of both pickup and timing tolerances.)
4. Remove the input current.
Integrating Reset
1. Connect and configure the relay for integrating reset testing.
a. Connect the test setup shown in Figure 10.
b. Set circuit board switch SW3 as follows:
c. SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
d. SW3-2 = OFF (no additional time delay for the 50-A element)
e. SW3-3 = ON (Westinghouse CO/COM type characterist i c c urves)
f. SW3-4 = ON (integrating reset characteristic)
g. Set TIME DIAL to 9.9
h. Set CURVE to V.
i. Set TIME PICKUP to 1.0.
j. Set INST PICKUP (50-A) to 90.
Testing BE1-50/51B-241
Page 27
9252000792 Rev D 19
k. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15. 0 Aac).
2. Apply 4.0 Aac to terminals 8 and 9. After the unit trips, remove the applied current for 29 ±0.25
seconds, then reapply the current (4.0 Aac). Note the elapsed time from the reapplication of curre nt to
the second trip. The elapsed time should be 2.08 ±0. 4 secon ds.
Instantaneous Overcurrent A (50-A) Pickup
1. Connect and configure the relay for 50-A pickup testing:
a. Connect the test setup shown in Figure 10.
b. Set circuit board switch SW3 as follows:
SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (Westinghouse CO/COM type characterist i c c urves)
SW3-4 = ON (integrating reset characteristic)
c. Set TIME DIAL to 0.0.
d. Set CURVE to S.
e. Set TIME PICKUP to 15.0.
f. Set INST PICKUP (50-A) to 02.
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).
2. Apply and slowly increase current to terminals 8 and 9 until the 50-A output contacts close. The
applied current should be between 1.935 and 2.065 Aac.
3. Decrease the applied current until the 50-A output contacts open.
4. Set INST PICKUP (50-A) to 08.
5. Slowly increase the current applied to terminals 8 and 9 until the 50-A output contacts close. The
applied current should be between 7.815 and 8.185 Aac.
6. Reduce the applied current to zero.
Figure 10. 51 Pickup, Time Dial, Integrating Reset, and 50-A Pickup Test Setup
Instantaneous Overcurrent B (50-B) Pickup
1. Connect and configure the relay for 50-B pickup t est i ng:
a. Connect the test setup shown in Figure 11.
BE1-50/51B-241 Testing
Page 28
20 9252000792 Rev D
b. Set circuit board switch SW3 as follows:
SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (Westinghouse CO/COM type characterist i c c urves)
SW3-4 = ON (integrating reset characteristic)
c. Set TIME DIAL to 0.0.
d. Set CURVE to S.
e. Set TIME PICKUP to 15.0.
f. Set INST PICKUP (50-A) to 90.
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to 20 (2.0 Aac).
2. Apply and slowly increase current to terminals 8 and 9 until the 50-B output contacts close. The
applied current should be between 1.935 and 2.065 Aac.
3. Decrease the applied current until the 50-B output contacts open.
4. Set INST PICKUP (50-B) to 80 (8.0 Aac).
5. Slowly increase the current applied to terminals 8 and 9 until the 50-B output contacts close. The
applied current should be between 7.815 and 8.185 Aac.
6. Reduce the applied current to zero.
Figure 11. 50-B Pickup Test Setup
Target Indicators
1. Connect and configure the relay for target indi cator testing:
a. Connect the test setup shown in Figure 12.
b. Set circuit board switch SW3 as follows:
SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (Westinghouse CO/COM type characteristic curves)
SW3-4 = ON (integrating reset characteristic)
c. Set TIME DIAL to 0.0.
d. Set CURVE to S.
e. Set TIME PICKUP to 1.0.
f. Set INST PICKUP (50-A) to 90.
Testing BE1-50/51B-241
Page 29
9252000792 Rev D 21
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).
2. Apply 2 Aac to terminals 8 and 9 to trip the 51 relay o utput.
3. Slowly increase the voltage source to provide targ et current and verify that the Time target operates
at the level of current determined by the Target O perating Current Jumpers.
4. The Target Operating Current Jumpers are located on the circuit board and identified as J1 a nd J2.
J1 sets the minimum current range for the 50-A target and J2 sets the minimum current range for the
51 target. A jumper installed across pins 1 and 2 gives a m ini mum operating current of 0.9 to 2.25 A.
A jumper installed across pins 2 and 3 gives a minimum operating current of 80 to 200 mA.
5. Remove the target and sensing current and reset t he target.
6. Set TIME PICKUP to 9.0.
7. Set INST PICKUP (50-A) to 01.
8. Apply 2 Aac to terminals 8 and 9 to trip the 50-A relay output.
9. Slowly increase the voltage source to provide targ et current and verify that the Instantaneous target
operates at the level of current determined by the Target Operating Current Jumpers.
10. Remove the target and sensing current and reset the target.
Figure 12. Target Indicator Test Setup
Manual Trip
1. Configure the relay for manual trip testing:
a. Connect the test setup as shown in Figure 10.
b. Set circuit board switch SW3 as follows:
SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation
SW3-2 = OFF (no additional time delay for the 50-A element)
SW3-3 = ON (Westinghouse CO/COM type characterist i c c urves)
SW3-4 = ON (integrating reset characteristic)
c. Set TIME DIAL to 0.0
d. Set CURVE to S.
e. Set TIME PICKUP to 1.0.
BE1-50/51B-241 Testing
Page 30
22 9252000792 Rev D
f. Set INST PICKUP (50-A) to 90.
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to 20 (2.0 Aac).
Warning!
Trip circuit voltage is present at the front panel test points. When
shorting the test points, use insulated jumper s t o avoid contact with
these voltages.
2. Apply 0.9 Aac to terminals 8 and 9 (0.9 Aac provides relay operating power but is below the pickup
threshold.)
3. Connect a jumper to the Time Overcurrent Manual T rip j acks. Verify that the stop input of the test set
timer recognizes a 51 contact closure.
4. Remove the jumper and the current applied at relay t erminals 8 and 9.
5. Apply 0.9 Aac to terminals 8 and 9.
6. Connect a jumper to the Instantaneous Overcurrent Manual Trip jacks. Verify that the stop input of
the test set timer recognizes a 50-A contact closure
7. Remove the jumper and the current applied to relay t erminals 8 and 9.
8. Reset targets.
Testing BE1-50/51B-241
Page 31
9252000792 Rev D 23
Characteristic Curves
Introduction
This chapter describes and defines the instantaneous overcurrent, time overcurrent, and integrat i ng time
reset characteristics of the BE1-50/51B-241 relay.
Instantaneous Overcurrent Characteristics
Timing
The instantaneous characteristic curves of t he B E1-50/51B-241 relay are similar to standard
electromechanical instantaneous units. Ho wever, the time to trip for applications where the init i al sensing
current is less than 400 mA may be slightly longer. This may occur on a very lightly loaded circuit or when
the relay is providing ground protection and is c onnected to measure neutral current. Figure 13 shows the
instantaneous characteristic curves for the m aximum time to trip.
Figure 13. Instantaneous Characteristic Curves
The delay of the Instantaneous A (50-A) element can be set for no intentional delay (switch SW3-2 open)
or a fixed delay of 100 milliseconds (SW3-2 closed). Figure 5 illustrates the location of SW3. The time
delay of the 50-B element is not switch-selectable and is fixed at no intentional delay.
Pickup
The instantaneous elements of the BE1-50/51B-241 relay may be set lower than the instantaneous
element in Westinghouse CO/COM relays and st i ll have the same reach. This is because the
BE1-50/51B-241 instantaneous elements effectiv el y eliminate the fault current transient overreach
components. When setting the BE1-50/51B-241 instantaneous elements, calculate the symmetrical val ue
without any adder for transient overreach.
BE1-50/51B-241 Characteristic Curves
Page 32
24 9252000792 Rev D
K
BD
C
M
AD
T
N
T
+
+
−
=
Curve
Type
BE A B C N K R
S
CO-2
A-2
0.2663
0.03393
1.000
1.2969
0.028
0.500
L
CO/COM-5
A-3
5.6143
2.18592
1.000
1.0000
0.028
15.750
D
CO/COM-6
A-4
0.4794
0.21359
1.000
1.5625
0.028
0.875
M
CO/COM-7
A-5
0.3022
0.12840
1.000
0.5000
0.028
1.750
I
CO/COM-8
A-6
8.9341
0.17966
1.000
2.0938
0.028
9.000
V
CO/COM-9
A-7
5.4678
0.10814
1.000
2.0469
0.028
5.500
E
CO/COM-11
A-8
7.7624
0.02758
1.000
2.0938
0.028
7.750
B
BS142-B∗
A-9
1.4636
0.00000
1.000
1.0469
0.028
3.250
C
BS142-C∗
A-10
8.2506
0.00000
1.000
2.0469
0.028
8.000
F
None†
None
0.0000
1.00000
0.000
0.0000
0.000
1.000
Time Overcurrent Characteristics
Nine inverse time functions and one fixed (definite) time function can be selected at the front panel. Curve
types are identified by a letter designator. Available curve types are short inverse (S), long inverse (L),
definite time (D), moderately inverse (M), inverse (I), very inverse (V), extremely inverse (E), BS142
inverse, (B), and BS142 extremely inverse (C).
Inverse Time Functions
Characteristic curves for the inverse and definite time functions are defined by the following equation:
Where: T
= time to trip in seconds
T
D = time dial setting
M = multiple of pickup setting
A, B, C, N, K = constants for the particular curve
Characteristic Curve Groups
Either GE IAC or Westinghouse CO/COM charact eristic curve groups are selected throug h switch SW3-3.
(Refer to Figure 5 for the location of SW3.)
Characteristic Curve Constants
Table 4 and Table 5 list the time characteristic curve constants used by the relay. Constant s hav e been
selected to conform to the characteristics of ele ctromechanical relays over a range of pickup m ultiples
from 1.3 to 40. Values of the constants are provided f or use in PC relay setting applications. Timing
accuracy is ±1 cycle ±2% of time to t ri p.
Table 4. Time Characteristic Curve Constants with Switch SW3-3 Open (Off)
Similar To
Figure
Number
Constants
∗ Curves B and C are defined in British Standard BS142 and IEC 255-4 (International
Electrotechnical Commission).
† Fixed time from 0.1 to 9.9 seconds.
Characteristic Curves BE1-50/51B-241
Page 33
9252000792 Rev D 25
Curve
Type
BE A B C N K R
S
IAC 55
A-11
0.0286
0.0208
1.000
0.9844
0.028
0.0940
L
IAC 66
A-12
2.3955
0.00002
1.000
0.3125
0.028
7.8001
D
CO/COM-6
A-4
0.4797
0.21359
1.000
1.5625
0.028
0.8750
M
CO/COM-7
A-5
0.3022
0.12840
1.000
0.5000
0.028
1.7500
I
IAC 51
A-13
0.2747
0.1042
1.000
0.4375
0.028
0.8868
V
IAC 53
A-14
4.4309
0.0991
1.000
1.9531
0.028
5.8231
E
IAC 77
A-15
4.9883
0.0129
1.000
2.0469
0.028
4.7742
B
BS142-B∗
A-9
1.4636
0.00000
1.000
1.0469
0.028
3.2500
C
BS142-C∗
A-10
8.2506
0.00000
1.000
2.0469
0.028
8.0000
F
None†
None
0.0000
1.00000
0.000
0.0000
0.000
1.0000
Table 5. Time Characteristic Curve Co nstants with Switch SW3-3 Closed (On)
Similar To
Figure
Number
Constants
∗ Curves B and C are defined in British Standard BS142 and IEC 255-4 (International
Electrotechnical Commission).
† Fixed time from 0.1 to 9.9 seconds.
Characteristic Curves
Figure 14 through Figure 27 illustrate the BE 1-50/51B-241 time overc urrent characteristic curves.
BE1-50/51B-241 Characteristic Curves
Page 34
26 9252000792 Rev D
Figure 14. Short Inverse (S) Time Characteristic Curve (SW3-3 Off, Similar to CO-2)
Characteristic Curves BE1-50/51B-241
Page 35
9252000792 Rev D 27
Figure 15. Long Inverse (L) Time Characteristic Curve (SW3-3 Off, Similar to CO/COM-5)
BE1-50/51B-241 Characteristic Curves
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28 9252000792 Rev D
Figure 16. Definite Time (D) Time Characteristic Curve (Similar to CO/COM-6)
Characteristic Curves BE1-50/51B-241
Page 37
9252000792 Rev D 29
Figure 17. Moderately Inverse (M) Time Characterist ic Curve (Similar to CO/COM-7)
BE1-50/51B-241 Characteristic Curves
Page 38
30 9252000792 Rev D
Figure 18. Inverse (I) Time Characteristic Curve (SW3-3 Off, Similar to CO/COM-8)
Characteristic Curves BE1-50/51B-241
Page 39
9252000792 Rev D 31
Figure 19. Very Inverse (V) Time Characteristic Curve (SW3-3 Off, Similar to CO/COM-9)
BE1-50/51B-241 Characteristic Curves
Page 40
32 9252000792 Rev D
Figure 20. Extremely Inverse (E) Time Characteristi c Curve (SW3-3 Off, Similar to CO/COM-11)
Characteristic Curves BE1-50/51B-241
Page 41
9252000792 Rev D 33
Figure 21. BS142 Very Inverse (BS142-B) Time Characteristic Curve
BE1-50/51B-241 Characteristic Curves
Page 42
34 9252000792 Rev D
Figure 22. BS142 Extremely Inverse (BS142-C) Time Characteristic Curve
Characteristic Curves BE1-50/51B-241
Page 43
9252000792 Rev D 35
Figure 23. Short Inverse (S2) Time Characteristic Curve (SW3-3 On, Similar to IAC 55)
BE1-50/51B-241 Characteristic Curves
Page 44
36 9252000792 Rev D
Figure 24. Long Inverse (L2) Time Characteristic C urve (SW3-3 On, Similar to IAC 66)
Characteristic Curves BE1-50/51B-241
Page 45
9252000792 Rev D 37
Figure 25. Inverse (I2) Time Characteristic Curve (SW3-3 On, Similar to IAC 51)
BE1-50/51B-241 Characteristic Curves
Page 46
38 9252000792 Rev D
Figure 26. Very Inverse (V2) Time Characteristic Curve (SW3-3 On, Similar to IAC 53)
Characteristic Curves BE1-50/51B-241
Page 47
9252000792 Rev D 39
Figure 27. Extremely Inverse (E2) Time Characterist ic Curve (SW3-3 On, Similar to IAC 77)
BE1-50/51B-241 Characteristic Curves
Page 48
40 9252000792 Rev D
1
2
−
=
M
RD
T
R
Trip to Time=++
−
= KBD
CM
AD
T
N
T
Timing Accuracy
Timing accuracy is the sum of ±1 cycle, ±2% . Thi s accuracy applies to the range of 1.3 to 40 times tap
and is for a given measured multiple of tap. Measurement accuracy of the multiple of tap is the sum of
±2%, ±25 mA.
Fixed Time Characteristic
The fixed time characteristic corresponds to the time dial setting and provides delays of 0.0 to 9.9
seconds. The time setting is constant over a range of pickup multiples from 1.0 to 40. Accuracy is ±1
cycle, ±2% of the time to trip for time dial set tings of 0.1 and greater.
Integrating Time Reset Characteristic
The relay can be user-configured for integrating or instantaneous type reset.
Integrating reset simulates the disk reset of electromechanical relays and begins when the current
decreases below 95% of pickup. BE1-50/51B-241 relays provide the integrating reset function even when
input current decreases to zero.
Integrating reset characteristics are defined by the following equation and are illustrated in Figure 28. See
Table 4 and Table 5 for the equation constants.
Where: T
R = constant for the particular curve
D = time dial setting
M = current in multiples of pickup setting during reset
Time characteristic curve equation:
= time to reset in seconds
R
Figure 28. Integrating Reset Characteristic Cur ve
Where: D = time dial setting
M = multiple of pickup setting
Characteristic Curves BE1-50/51B-241
Page 49
9252000792 Rev D 41
Reset to Time=
−
=
1
2
M
RD
T
R
Reset characteristic curve equation:
Instantaneous Reset
Reset occurs within 16 milliseconds of when the current decreases to 95% of the pickup level.
BE1-50/51B-241 Characteristic Curves
Page 50
42 9252000792 Rev D
Characteristic Curves BE1-50/51B-241
Page 51
Page 52
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