GE UR Series L90, Инструкция по эксплуатации

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GE Multilin L90 Line Current Differential System 2-21
2 PRODUCT DESCRIPTION 2.4 SPECIFICATIONS
2
LINE CURRENT DIFFERENTIAL (87L)
Application: 2 or 3 terminal line, series compensated
line, tapped line, with charging current
compensation
Pickup current level: 0.20 to 4.00 pu in steps of 0.01
CT Tap (CT mismatch factor): 0.20 to 5.00 in steps of 0.01
Slope # 1:
1 to 50%
Slope # 2: 1 to 70%
Breakpoint between slopes: 0.0 to 20.0 pu in steps of 0.1
Zero-sequence current differential (87LG):
87LG pickup level: 0.05 to 1.00 pu in steps of 0.01
87LG slope: 1 to 50%
87LG pickup delay: 0.00 to 5.00 s in steps of 0.01
DTT: Direct Transfer Trip (1 and 3 pole) to
remote L90
Operating Time: 1.0 to 1.5 power cycles duration
Asymmetrical channel delay compensation using GPS:
asymmetry up to 10 ms
In-zone transformer group compensation: 0 to 330° in steps of
30°Inrush inhibit level:1.0 to 40.0%f
0
in
steps of 0.1
Inrush inhibit mode:per-phase, 2-out-of-3, average
LINE CUR-
RENT DIFFERENTIAL TRIP LOGIC
87L trip: Adds security for trip decision; creates 1
and 3 pole trip logic
DTT: Engaged Direct Transfer Trip (1 and 3
pole) from remote L90
DD: Sensitive Disturbance Detector to detect
fault occurrence
Stub bus protection: Security for ring bus and 1½ breaker
configurations
Open pole detector: Security for sequential and evolving
faults
RESTRICTED GROUND FAULT
Pickup: 0.005 to 30.000 pu in steps of 0.001
Dropout: 97 to 98% of pickup
Slope: 0 to 100% in steps of 1%
Pickup delay: 0 to 600.00 s in steps of 0.01
Dropout delay: 0 to 600.00 s in steps of 0.01
Operate time: <1 power system cycle
PHASE/NEUTRAL/GROUND TOC
Current: Phasor or RMS
Pickup level: 0.000 to 30.000 pu in steps of 0.001
Dropout level: 97% to 98% of pickup
Level accuracy:
for 0.1 to 2.0

CT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
for > 2.0

CT: ±1.5% of reading > 2.0

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
2
t; FlexCurves™
(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)
Curve timing accuracy
at 1.03 to 20 x pickup:
±3.5% of operate time or ±½ cycle
(whichever is greater) from pickup to
operate
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

pickup at 60 Hz
(Phase/Ground IOC)
<20 ms at 3

pickup at 60 Hz
(Neutral IOC)
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)