GE L90 Instruction Manual page 48

SPECIFICATIONS
87LG operate time:
LINE CURRENT DIFFERENTIAL TRIP LOGIC
87L trip:
DTT:
DD:
Stub bus protection:
Open pole detector:
2
RESTRICTED GROUND FAULT
Pickup:
Dropout:
Slope:
Level accuracy:
0.1 to 2.0 x CT rating:
>2.0 x CT rating
Pickup delay:
Dropout delay:
Operate time:
PHASE/NEUTRAL/GROUND TOC
Current:
Pickup level:
Dropout level:
Level accuracy:
0.1 to 2.0 × CT:
> 2.0 × CT:
Curve shapes:
Curve multiplier:
Reset type:
Curve timing accuracy at 1.03 to 20 x pickup:
Voltage restraint:
PHASE/NEUTRAL/GROUND IOC
Pickup level:
Dropout level:
Level accuracy:
0.1 to 2.0 × CT rating:
> 2.0 × CT rating:
Overreach:
Pickup delay:
Reset delay:
Operate time:
Timer accuracy:
NEGATIVE SEQUENCE TOC
Current:
Pickup level:
Dropout level:
Level accuracy:
2-34
1.5 to 2.5 cycles
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
0.005 to 30.000 pu in steps of 0.001
97 to 98% of pickup
0 to 100% in steps of 1%
±0.5% of reading or ±1% of rated (whichever is greater)
±1.5% of reading
0 to 600.00 s in steps of 0.01
0 to 600.00 s in steps of 0.01
<1 power system cycle
Phasor or RMS
0.020 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,
2
Short/Very/ 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)
±3.5% of operate time or ±½ cycle (whichever is greater) from pickup to operate
Modifies pickup current for voltage in the range of 0.1 < V < 0.9 VT Nominal in a fixed linear rela-
tionship
0.020 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%
0.00 to 600.00 s in steps of 0.01
0.00 to 600.00 s in steps of 0.01
<16 ms at 3 × pickup at 60 Hz (Phase/Ground IOC)
<20 ms at 3 × pickup at 60 Hz (Neutral IOC)
±3% of operate time or ±1/4 cycle (whichever is greater)
Phasor
0.020 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)
from 0.1 to 2.0 x CT rating
±1.5% of reading > 2.0 x CT rating
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: PRODUCT DESCRIPTION