GE L90 Instruction Manual page 53

CHAPTER 2: PRODUCT DESCRIPTION
BREAKER RESTRIKE
Principle:
Availability:
Pickup level:
Reset delay:
SYNCHROCHECK
Max voltage difference:
Max angle difference:
Max freq. difference:
Hysteresis for max. freq. diff.:
Dead source function:
S-CLS MAX dF:
S-CLS MIN dF:
V2 MAG CORR FACTOR:
V2 ANGLE SHIFT:
AUTORECLOSURE
Two breakers applications
Single- and three-pole tripping schemes
Up to four reclose attempts before lockout
Selectable reclosing mode and breaker sequence
PILOT-AIDED SCHEMES
Direct Underreaching Transfer Trip (DUTT)
Permissive Underreaching Transfer Trip (PUTT)
Permissive Overreaching Transfer Trip (POTT)
Hybrid POTT Scheme
Directional Comparison Blocking Scheme
Directional Comparison Unblocking Scheme (DCUB)
TRIP OUTPUT
Collects trip and reclose input requests and issues outputs to control tripping and reclosing.
Communications timer delay:
Evolving fault timer:
Timer accuracy:
POWER SWING DETECT
Functions:
Characteristic:
Measured impedance:
Blocking / tripping modes:
Tripping mode:
Current supervision:
Pickup level:
Dropout level:
Fwd / reverse reach (sec. Ω):
Left and right blinders (sec. Ω):
Impedance accuracy:
Fwd / reverse angle impedances:
Angle accuracy:
Characteristic limit angles:
Timers:
Timer accuracy:
LOAD ENCROACHMENT
Responds to:
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
detection of high-frequency overcurrent condition ¼ cycle after breaker opens
one per CT/VT module (not including 8Z modules)
0.1 to 2.00 pu in steps of 0.01
0.000 to 65.535 s in steps of 0.001
0 to 400000 V in steps of 1
°
0 to 100 in steps of 1
0.00 to 2.00 Hz in steps of 0.01
0.00 to 0.10 Hz in steps of 0.01
None, LV1 & DV2, DV1 & LV2, DV1 or DV2, DV1 xor DV2, DV1 & DV2 (L = Live, D = Dead)
0.10 to 2.00 Hz in steps of 0.01
0.00 to 1.00 Hz in steps of 0.01
0.10 to 10.00 in steps of 0.01
° ° °
-180 to +180 in steps of 1
0 to 65535 s in steps of 0.001
0.000 to 65.535 s in steps of 0.001
±3% of operate time or ±1/4 cycle (whichever is greater)
Power swing block, out-of-step trip
Mho or Quad
Positive-sequence
2-step or 3-step
Early or Delayed
0.050 to 30.000 pu in steps of 0.001
97 to 98% of pickup
0.10 to 500.00 Ω in steps of 0.01
0.10 to 500.00 Ω in steps of 0.01
±5%
40 to 90° in steps of 1
±2°
40 to 140° in steps of 1
0.000 to 65.535 s in steps of 0.001
±3% of operate time or ±1/4 cycle (whichever is greater)
Positive-sequence quantities
SPECIFICATIONS
2
2-39