GE L90 Instruction Manual page 50

2.4 SPECIFICATIONS
LINE CURRENT DIFFERENTIAL (87L)
Application:
Pickup current level:
CT Tap (CT mismatch factor): 0.20 to 5.00 in steps of 0.01
Slope # 1:
2
Slope # 2:
Breakpoint between slopes: 0.0 to 20.0 pu in steps of 0.1
Zero-sequence current differential (87LG):
87LG pickup level:
87LG slope:
87LG pickup delay:
DTT:
Operating Time:
Asymmetrical channel delay compensation using GPS:
LINE CURRENT DIFFERENTIAL TRIP LOGIC
87L trip:
DTT:
DD:
Stub bus protection:
Open pole detector:
PHASE/NEUTRAL/GROUND TOC
Current:
Pickup level:
Dropout level:
Level accuracy:
for 0.1 to 2.0 CT:
for > 2.0 CT:
Curve shapes:
Curve multiplier:
Reset type:
Timing accuracy:
2-18
2 or 3 terminal line, series compensated
line, tapped line, with charging current
compensation
0.20 to 4.00 pu in steps of 0.01
1 to 50%
1 to 70%
0.05 to 1.00 pu in steps of 0.01
1 to 50%
0.00 to 5.00 s in steps of 0.01
Direct Transfer Trip (1 and 3 pole) to
remote L90
1.0 to 1.5 power cycles duration
asymmetry up to 10 ms
Adds security for trip decision; creates 1
and 3 pole trip logic
Engaged Direct Transfer Trip (1 and 3
pole) from remote L90
Sensitive Disturbance Detector to detect
fault occurrence
Security for ring bus and 1½ breaker
configurations
Security for sequential and evolving
faults
Phasor or RMS
0.000 to 30.000 pu in steps of 0.001
97% to 98% of pickup
±0.5% of reading or ±0.4% of rated
(whichever is greater)
±1.5% of reading > 2.0 CT rating
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)
Time Dial = 0.00 to 600.00 in steps of
0.01
Instantaneous/Timed (per IEEE)
Operate at > 1.03 actual pickup
±3.5% of operate time or ±½ cycle
(whichever is greater)
L90 Line Current Differential System
2 PRODUCT DESCRIPTION
PHASE/NEUTRAL/GROUND IOC
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 rating: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
> 2.0 CT rating ±1.5% of reading
Overreach: <2%
Pickup delay: 0.00 to 600.00 s in steps of 0.01
Reset delay: 0.00 to 600.00 s in steps of 0.01
Operate time: <16 ms at 3
(Phase/Ground IOC)
<20 ms at 3
(Neutral IOC)
Timing accuracy: Operate at 1.5
±3% or ±4 ms (whichever is greater)
NEGATIVE SEQUENCE TOC
Current: Phasor
Pickup level: 0.000 to 30.000 pu in steps of 0.001
Dropout level: 97% to 98% of pickup
Level accuracy: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
from 0.1 to 2.0 x CT rating
±1.5% of reading > 2.0 x CT rating
Curve shapes: IEEE Moderately/Very/Extremely
Inverse; IEC (and BS) A/B/C and Short
Inverse; GE IAC Inverse, Short/Very/
Extremely Inverse; I
(programmable); Definite Time (0.01 s
base curve)
Curve multiplier (Time dial): 0.00 to 600.00 in steps of 0.01
Reset type: Instantaneous/Timed (per IEEE) and Lin-
ear
Timing accuracy: Operate at > 1.03
±3.5% of operate time or ±½ cycle
(whichever is greater)
NEGATIVE SEQUENCE IOC
Current: Phasor
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
or ±0.4% of rated (whichever is greater);
2.0
Overreach: 2%
Pickup delay: 0.00 to 600.00 s in steps of 0.01
Reset delay: 0.00 to 600.00 s in steps of 0.01
Operate time: < 20 ms at 3
Timing accuracy: Operate at 1.5
±3% or ±4 ms (whichever is greater)
pickup at 60 Hz
pickup at 60 Hz
pickup
2
t; FlexCurves™
actual pickup
CT rating: ±0.5% of reading
CT rating: ±1.5% of reading
pickup at 60 Hz
pickup
GE Multilin