Specifications; Protection Elements - GE B90 UR Series Instruction Manual

2.2 SPECIFICATIONS

2.2SPECIFICATIONS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
The operating times below include the activation time of a trip rated form-A output contact unless otherwise indi-
cated. FlexLogic operands of a given element are 4 ms faster. Take this into account when using FlexLogic to inter-
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connect with other protection or control elements of the relay, building FlexLogic equations, or interfacing with other
NOTE
IEDs or power system devices via communications or different output contacts.
BUS DIFFERENTIAL (87B)
Pickup level:
Low slope:
High slope:
Low breakpoint:
High breakpoint:
High set level:
Dropout level:
Level accuracy:
0.1 to 2.0  CT rating: ±0.5% of reading or ±1% of rated (whichever is greater)
>2.0  CT rating
Operating time:
Number of zones:
Max number of inputs:
CT TROUBLE
Responding to:
Pickup level:
Pickup delay:
Time accuracy:
Availability:
ISOLATOR MONITORING
Responding to:
Asserting:
Alarm pickup delay:
Time accuracy:
TIME OVERCURRENT
Pickup level:
Dropout level:
Level accuracy:
0.1 to 2.0  CT
above 2.0  CT
Curve shapes:
TD multiplier:
Reset type:
Time accuracy:
INSTANTANEOUS OVERCURRENT
Pickup level:
Dropout level:
Level accuracy:
0.1 to 2.0  CT
above 2.0  CT
Pickup delay:
Reset delay:
2-10
0.050 to 2.000 pu in steps of 0.001
15 to 100% in steps of 1
50 to 100% in steps of 1
1.00 to 30.00 pu in steps of 0.01
1.00 to 30.00 pu in steps of 0.01
0.10 to 99.99 pu in steps of 0.01
97 to 98% of pickup
±1.5% of reading
one power system cycle (typical)
1 or 4 (option)
8, 16, or 24 (option)
Differential current
0.020 to 2.000 pu in steps of 0.001
1.0 to 60.0 sec. in steps of 0.1
±3% or ±40 ms, whichever is greater
one per zone of protection
Both normally-open and normally-closed auxiliary contacts
Isolator Position, Isolator Alarm, Block Switching
0.00 to 10.00 s in steps of 0.05
±3% or ±40 ms, whichever is greater
0.000 to 30.000 pu in steps of 0.001
97 to 98% of pickup
0.5% of reading or 1% of nominal (whichever is greater)
1.5% of reading
IEEE Moderately/Very/Extremely Inverse; IEC (and BS) A/B/C and Short Inverse; GE IAC Inverse, Short/Very/
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Extremely Inverse; I t; FlexCurves™ (programmable); Definite Time (0.01 s base curve)
0.00 to 600.00 in steps of 0.01
Instantaneous or Timed (per IEEE)
±3% or ±40 ms, whichever is greater
0.000 to 30.000 pu in steps of 0.001
97 to 98% of pickup
0.5% of reading or 1% of nominal (whichever is greater)
1.5% of reading
0 to 65.535 s in steps of 0.001
0 to 65.535 s in steps of 0.001
B90 Low Impedance Bus Differential System
2 PRODUCT DESCRIPTION

2.2.1 PROTECTION ELEMENTS

GE Multilin