Basler BE1-50/51B User manual

BE1-50/51B
The BE1-50/51B Time Overcurrent Relay provides economical
overload and fault protection for generators, transformers, lines
and motors.
ADVANTAGES
• Self powered from 50/60Hz systems, available for 5 or 1 amp
CT secondaries.
• Ten field selectable curves.
• Independent instantaneous overcurrent function.
• Drawout construction, testable in the case.
• Qualified to the requirements of:
- IEEE C37.90-1989, C37.90.1-1989, C37.90.2-1989, UL508
• 200 series adds:
- Patented integrating reset characteristic, even when current
goes to zero.
Replicates electromechanical reset for all applications.
- Five additional field selectable curves, for a total of 15.
• Five year warranty.
ADDITIONAL INFORMATION
INSTRUCTION MANUAL
Request Publication 9252000991
TIMING CURVES
Request Publication 9252000998 or 9252000894 for Basler-equivalent IAC curves
Request Publication 9252000999 for Basler-equivalent CO and BS142 curves
STANDARDS, DIMENSIONS and ACCESSORIES
Request Publication SDA
FEATURES and
APPLICATION
Page 2
FUNCTIONAL
DESCRIPTION
Pages 2-5
SPECIFICATIONS
Pages 6 and 7
ORDERING
INFORMATION
Page 8
UHD-14
5-08
P. O. BOX 269 HIGHLAND, ILLINOIS, U.S.A. 62249 PHONE [phone] FAX [phone]
BE1-50/51B
SELF POWERED
TIME OVERCURRENT
RELAY
Direct replacement "plug and play"
relays are available.
See Product Bulletin UHK.

BE1-50/51B
CURRENT INPUT
A single phase of ac current from a 5 Amp, or 1 Amp,
50/60 Hz, system current transformer (CT) is applied to
the BE1-50/51B. This input current provides both the
power and sensing quantity for the relay.
The current applied to the relay provides the energy for
the internal power supply. When sufficient current is
available, the Active/Pickup LED will turn green. In appli-
cations where circuit loading conditions are less than
that required to illuminate the LED, the relay remains
operable and will provide overcurrent protection.
The sensing input transformer provides the quantity to
be scaled and measured by the Time and Instantaneous
functions. Ranges, ratings, and accuracies apply as
described in Table 1.
FEATURES
• 15 field selectable, inverse, fixed time and British
Standard (BS142) time overcurrent curves on 200
series relays (10 on 100 series).
• Time characteristics extend to 40 X Pickup.
• Instantaneous overcurrent function.
• Wide setting ranges:
Time Overcurrent: 0.5 to 15.9 (5 Amp Unit)
0.1 to 3.18 (1 Amp Unit)
Inst. Overcurrent: 2.0 to 99 (5 Amp Unit)
0.2 to 19.8 (1 Amp Unit)
• Current pickup accuracy ± 2%.
• Timing accuracy ± 2%.
• Continuous automatic calibration.
• Less than 10% transient overreach.
• Zero Pickup setting for safety during installation.
• Timed Overcurrent Reset - Selectable Instantaneous
or Decay Characteristic (200 series relays only).
• 5VA burden (at nominal) self powered from 50/60 Hz
systems, utilizes standard 5 or 1 Amp CT secondaries.
• Drawout construction.
• Manual method for trip circuit testing.
• Standard magnetically latched targets for TOC
and IOC.
• Direct reading front panel controls.
• Positive visual indication that microprocessor is
executing code.
• UL recognized under standard 508.
• Qualified to the requirements of:
-IEEE C37.90.1-1989 for SWC.
-IEEE C37.90.2-1989 for RFI.
-IEC 255-5 for impulse.
APPLICATION
The BE1-50/51B is a single phase self powered, micro-
processor based time overcurrent relay. The relay is
designed for use in applications requiring time delayed
coordination for phase or ground overcurrent condi-
tions.
The relay can be used to provide coordinated protection
for overhead and underground distribution circuits. Other
applications include overcurrent back-up protection for
transformers and generators, the protection of neutral
grounding resistors and reactors, and motors.
Since all of the time-current characteristics are included
within the relay, a standard relay may be ordered before
the coordination study is completed, thereby allowing
the physical construction to proceed. 100 series relays
have curves that match ABB/Westinghouse time curve
shape. 200 series adds five unique GE-type curves. See
Table 2 for available curve types. This is also an advantage
as changes in the system configuration or coordination
may be accomplished without a hardware change.
Models are included (200 series) which have memory to
replicate the decaying reset of electromechanical relays
even when power to the relay is lost. Use the 200 series
for applications that require coordination with the reset-
ting of nearby electromechanical relays.
The instantaneous overcurrent element is standard in the
relay. This element is designed to minimize transient
overreach. The instantaneous element includes select-
able delay characteristics for improved coordination with
downstream devices and customer requirements.
2
FUNCTIONAL DESCRIPTION
Scaling of the input signal is accomplished by separate
networks for the time and instantaneous functions. The
scale factors are established by the front panel pick-up
settings. Pickup settings of 00 provide maximum
sensitivity as a safety precaution for the installation
process. Pickup will occur when the input current level is
adequate to power the unit.
MICROPROCESSOR
The setting of the TIME DIAL, TIME CURVE selector switch,
and circuit board jumpers provide the micro-processor
with ten operating parameters for the desired response by
the relay. The microprocessor performs the program
operations based on the input current level and internal
software program. When the Active/Pickup LED is green,
the microprocessor is active and executing code.

BE1-50/51B
3
FUNCTIONAL DESCRIPTION, continued
Table 1 - Current Sensing Capabilities
Time Element Time Element
50/60 Hz System Time Element Max. Continuous Max. Current Instantaneous Time Element Instantaneous
CT Secondary Pickup Range Current For 1 Second Pickup Range Pickup Accuracy Pickup Accuracy
5 Amp 0.5 to 15.9 Amps 14 Amps 400 Amps 1 to 99 Amps 2% from 0.5 to 2% from 1 to 99 Amps
in 0.1 Amp Steps in 1 Amp Steps 15.9 Amps
1 Amp 0.1 to 3.18 Amps 2.8 Amps 80 Amps 0.2 to 19.8 Amps 2% from 0.1 to 2% from 0.2 to 19.8 Amps
in .02 Amp Steps in 0.2 Amp Steps 3.18 Amps
Operating power from the power supply is applied to
the microprocessor supervisor circuit. When the input
current falls below an acceptable level, the supervisor
circuit interrupts the microprocessor and halts further
operation.
Figure 1 - Functional Block Diagram
The watchdog timer monitors the microprocessor for
specific pulses indicating proper program operation. If
something occurs to disrupt the microprocessor, these
pulses stop, the watchdog timer times out and sends a
reset pulse to the microprocessor. The microprocessor
resets and resumes normal operation.

BE1-50/51B
4
The instantaneous reset characteristic forces the timer to
zero when the input current falls below 95% of setting.
This fast reset characteristic prevents the ratcheting
effect on electro-mechanical relay disks that occurs for
repeated faults.
The decaying reset characteristic replicates the decay-
ing reset of electromechanical relay disks. Models with
style numbers in the 200 series continue the decaying
process even when the input current goes to zero.
Models with style numbers in the 100 series reset imme-
diately when the input current drops below the minimum
required to power-up the relay (.5A for 5A models and
0.1A for 1A models).
TIME DIAL RANGE AND ACCURACY
The TIME DIAL range is 0.0 to 9.9 in 0.1 steps. A setting of
0.0 results in instantaneous operation without intentional
time delay.
INSTANTANEOUS ELEMENT CHARACTERISTICS
The characteristic for phase faults is faster because the
relay will be powered-up. However, the tripping charac-
teristic for ground applications is slightly longer to allow
time to power-up the relay. This longer trip time for
ground applications is beneficial because it helps avoid
nuisance trips. These timing characteristics are shown in
Figure 3.
Additional definite time delays of 0.1, 0.2 or 0.3 seconds
may be added to the instantaneous element on 100
series units; 200 series units have only 0.1 seconds. The
definite delay is determined by switches on the circuit
card.
OUTPUTS
Separate output contacts are provided for the TIME (51)
and INST (50) trip functions. An additional auxiliary
output relay (51 AUX) is included. This output operates
simultaneously with the TIME output relay. All output
contacts are configured normally open (NO).
MANUAL TRIP TESTING
The relay is provided with front panel test points to allow
shorting the output terminals to verify external control
circuit wiring.
TARGETS
Two target indicators are provided as a standard feature
of the BE1-50/51B. These magnetically latched, current
operated targets provide visual indication of trip by the
TIME or INST output contact. These targets must be
manually reset after the abnormal condition has been
removed or corrected.
Actual curve constants are available in the Instruction
Manual. See page 1 of this bulletin for applicable
publication number.
The Active/Pickup LED on the front panel will turn red
when the applied current just exceeds the PICKUP
setting.
RESET
Reset occurs when the current level is less than pickup.
Internal switch provides selection of either an Instanta-
neous or a decaying reset characteristic.
OUTPUTS
The TIME contacts (51 and 51AUX) are closed in
accordance with conditions defined by the selected time
characteristic equation and the sensed current magni-
tude. If the sensed current exceeds the INST PICKUP
setting, the INST contacts (50) are closed.
Breakers controlled by the output contacts can be manu-
ally trip tested by inserting a jumper between the TIME
and INST MANUAL TRIP test points on the front panel.
TIME ELEMENT CHARACTERISTIC SHAPES
FOR CO and BS142 CURVES
All time characteristic curves follow the relation:
TT= AD + BD + K = Time to trip
MN-C
TR= RD = Time for decaying reset
M2-1
Table 2.
Curve Type
Basler Type Similar To
S1 Short Inverse ABB CO-2
S2 Short Inverse GE-IAC-55 200 series only
L1 Long Inverse ABB CO-5
L2 Long Inverse GE IAC-66 200 series only
D1, D2 Definite Inverse ABB CO-6
M1, M2 Definite Inverse ABB CO-7
I1 Inverse ABB CO-8
I2 Inverse GE IAC-51 200 series only
V1 Very Inverse ABB CO-9
V2 Very Inverse GE IAC53 200 series only
E1 Extremely Inverse ABB CO-11
E2 Extremely Inverse GE IAC 77 200 series only
B British Standard BS 142-B
Very Inverse
C British Standard BS 142-C
Extremely Inverse
F Fixed Time none
FUNCTIONAL DESCRIPTION, continued

BE1-50/51B
5
Figure 3 - Instantaneous Characteristics
CO and BS142 curves in 100 and 200 series models:
S=Short Inverse M=Moderately Inverse B=BS142 Very Inverse
L=Long Inverse I=Inverse C=BS142 Extremely Inverse
D=Definite Time V=Very Inverse F=Fixed Time
E=Extremely Inverse
Figure 2 - Time-Current Characteristics
IAC curves in 200 series models only:
• Short Inverse
• Inverse
• Very Inverse
• Extremely Inverse
• Long Inverse
FUNCTIONAL DESCRIPTION, continued
Figure 4 - Front Panel, S1 Case

BE1-50/51B
INVERSE TIMING ACCURACY:
± 2%, ±1 cycle for multiples of pickup from 2 to 40.
Below multiples of 2, errors may increase directly
proportional to the value of ______.
(MN-1)
FIXED TIME ACCURACY:
±2% or 30 milliseconds, whichever is greater.
TIME RESET:
Instantaneous or decay, internally selectable.
INST PICKUP RANGE:
5 Amp Unit: 2.0 to 99 Amps in 1 Amp steps
1 Amp Unit: 0.2 to 19.8 Amps in 0.2 Amp steps
INST DROPOUT:
95% of pickup
INST PICKUP ACCURACY:
± 2% of setting
INST CHARACTERISTIC:
See Figure 3. Additional user selectable (by DIP
switches) definite delays of 0.1, 0.2 and 0.3 seconds
for -100 series; 0 and 0.1 for -200 series.
INST TRANSIENT RESPONSE:
Less than 10% overreach with system time
constants up to 40 milliseconds.
1
CURRENT SENSING INPUT:
5 Amp Unit 14.0 Amps 400 Amps
1 Amp Unit 2.8 Amps 80 Amps
Continuous One Second
Current Current
6
SPECIFICATIONS
TIME PICKUP RANGE:
5 Amp Unit: 0.5 to 15.9 Amps in 0.1 Amp steps
1 Amp Unit: 0.1 to 3.18 Amps in 0.02 Amp steps
TIME DROPOUT:
Not less than 95% of pickup value.
TIME PICKUP ACCURACY:
± 2% of setting
TIME DIAL RANGE:
0.0 to 9.9 in 0.1 steps
TIME CHARACTERISTICS:
Nine inverse time and 1 fixed time function can be
selected by a front panel switch. Characteristic
curves are defined by the time characteristic
equation. The fixed time characteristic provides
delays of 0.0 to 9.9 seconds corresponding to the
dial setting.
BURDEN: Burden is non-linear and resistive.
5 Amp Unit: 4.8 Ohms @ 0.5A & 0.2 Ohms @ 5A
1 Amp Unit: 120 Ohms @ 0.1A & 5 Ohms @ 1A
TARGETS:
Magnetically latched, manually reset for TIME and
INST output functions.
Operate Current: 0.2 Amp minimum
Coil Resistance: 0.1 Ohm
Operate Time: < 1 millisecond
OUTPUTS:
Resistive:
120/240 Vac: Make and carry 30 Amp for 0.2 sec.,
carry 7 Amp for 2 min., 3 Amp continuously, and
break 5 Amp.
125/250 Vdc: Make and carry 30 Amp for 0.2 sec.,
carry 7 Amp for 2 min., 3 Amp continuously, and
break 0.3 Amp.
Inductive:
120/240Vac, 125/250Vdc: Make and carry 30 Amp
for 0.2 sec., carry 7 Amp for 2 min., 3 Amp
continuously, and break 0.3 Amp. (L/R=0.04).
ISOLATION:
2000 Vac at 50/60 Hz for one minute (1500 Vac for
one minute across open contacts) in accordance
with IEC 255-5 and IEEE C37.90-1-1989
(Dielectric Test).
SURGE WITHSTAND CAPABILITY:
Qualified to IEEE C37.90.1-1989
FAST TRANSIENT:
Qualified to IEEE C37.90.1-1989
IMPULSE TEST:
Qualified to IEC 255-5
RADIO FREQUENCY INTERFERENCE (RFI):
Qualified to IEEE C37.90.2-1989. Field
tested using five watt transceiver operating at
random frequencies centered around 144 MHZ
and 440 MHZ.
TEMPERATURE:
Operating Range -40° C (-40° F) to 70° C (158° F).
Recommended Storage Range -50° C (-58° F) to
70° C (158° F).
SHOCK:
15g in each of three mutually perpendicular planes.
VIBRATION:
2g in each of three mutually perpendicular planes
swept over the range of 10 to 500 Hz for a total of
6 sweeps, 15 minutes per sweep.

BE1-50/51B
7
SPECIFICATIONS, continued
AGENCY:
cURus recognition per UL Standard 508, File E97035
and CSA Standard C22.2 No. 14
CASE SIZE: A1 or S1
NET WEIGHT: 8.6 pounds

BE1-50/51B
8
Printed in U.S.A.Printed in U.S.A.
Printed in U.S.A.Printed in U.S.A.
Printed in U.S.A.
Route 143, Box 269, Highland, Illinois U.S.A. 62249
Tel [phone] Fax [phone]
e-mail: [e-mail]
No. 1300 North Zhongshan Road, Wujiang Economic Development Zone
Suzhou, Jiangsu Province - P.R. China 215200
Tel [phone] Fax [phone]
e-mail: [e-mail]
www.basler.com
P.A.E. Les Pins, 67319 Wasselonne Cedex FRANCE
Tel [phone] Fax [phone]
e-mail: [e-mail]
NOTES
STANDARD ACCESSORIES:
A test plug is available to allow testing of the relay without
removing external wiring.
Order test plug: Basler part number: 10095.
ORDERING INFORMATION
All units are self powered and supplied with 10 switch
selectable curves, TIME and INST functions and outputs,
magnetically latched targets, and an auxiliary output
contact.
ORDERING
MODEL NUMBER
BE1-50/51B Time Overcurrent Relay
Table 3.
MODEL NUMBERNEW INSTALLATION PACKAGES
For 5 Amp System CT Secondaries
Semi-Flush Mounting, A1 Size Case BE1-50/51B-105
Drawout Construction, Testable-in-Case BE1-50/51B-205
Projection Mounting, S1 Size Case BE1-50/51B-106
Drawout Construction, Testable-in-Case BE1-50/51B-206
Semi-Flush Mounting, S1 Size Case BE1-50/51B-107
Drawout Construction, Testable-in-Case BE1-50/51B-207
For 1 Amp System CT Secondaries
Semi-Flush Mounting, A1 Size Case BE1-50/51B-101
Drawout Construction, Testable-in-Case BE1-50/51B-201
Projection Mounting, S1 Size Case BE1-50/51B-102
Drawout Construction, Testable-in-Case BE1-50/51B-202
Semi-Flush Mounting, S1 Size Case BE1-50/51B-103
Drawout Construction, Testable-in-Case BE1-50/51B-203
HOW TO ORDER:
Designate the Model Number and the three-digit dash number
from Table 3 to define the configuration desired.
Model numbers ending in 200 series include memory to replicate the decaying reset characteristic of electro-mechanical
relay disks even while the input current is zero. Model numbers ending in 100 series reset instantaneously (regardless
of settings) when the input current drops below the minimum TOC pickup value.