Specifications; Protection Elements - GE B90 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. This should be taken into account when using
2
FlexLogic™ to interconnect with other protection or control elements of the relay, building FlexLogic™ equations, or
NOTE
interfacing with other 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 (which-
>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:
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
ever is greater)
±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/
2
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
B90 Low Impedance Bus Differential System
2 PRODUCT DESCRIPTION

2.2.1 PROTECTION ELEMENTS

INSTANTANEOUS OVERCURRENT
Pickup level: 0.000 to 30.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy:
0.1 to 2.0 × CT
0.5% of reading or 1% of nominal
(whichever is greater)
above 2.0 × CT
1.5% of reading
Pickup delay: 0 to 65.535 s in steps of 0.001
Reset delay: 0 to 65.535 s in steps of 0.001
Time accuracy: ±3% or ±4 ms, whichever is greater
Operate time: <16 ms at 60 Hz
UNDERVOLTAGE
Pickup level: 0.000 to 3.000 pu in steps of 0.001
Dropout level: 102 to 103% of pickup
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0 to 65.535 s in steps of 0.001
Reset delay: 0 to 65.535 s in steps of 0.001
Time accuracy: ±3% or ±4 ms, whichever is greater
<16 ms at 60 Hz
Operate time:
END FAULT PROTECTION
IOC pickup level: 0.000 to 30.000 pu in steps of 0.001
IOC dropout level: 97 to 98% of pickup
Level accuracy
at 0.1 to 2.0 × CT:
0.5% of reading or 1% of nominal
(whichever is greater)
above 2.0 × CT:
1.5% of reading
CB open pickup timer: 0 to 65.535 s in steps of 0.001
End Fault pickup timer: 0 to 65.535 s in steps of 0.001
Time accuracy: ±3% or ±8 ms, whichever is greater
BREAKER FAILURE
Mode: 3-pole
Current supervision: phase current
Current supv. pickup: 0.001 to 30.000 pu in steps of 0.001
Current supv. dropout: 97 to 98% of pickup
Current supv. accuracy:
0.1 to 2.0 × CT rating: ±0.75% of reading or ±2% of rated
(whichever is greater)
above 2 × CT rating: ±2.5% of reading
Time accuracy: ±3% or 4 ms, whichever is greater
TRIP BUS (TRIP WITHOUT FLEXLOGIC™)
Number of elements: 6
Number of inputs: 16
Operate time: <2 ms at 60 Hz
Time accuracy: ±3% or 10 ms, whichever is greater
GE Multilin