GE L90 Instruction Manual page 47

CHAPTER 2: PRODUCT DESCRIPTION
Pickup:
Dropout:
Memory duration:
Voltage supervision pickup (series compensation applications):
GROUND DISTANCE OPERATING TIME CURVES
The operating times are response times of a microprocessor part of the relay. See output contacts specifications for estimation of the
total response time for a particular application. The operating times are average times including variables such as fault inception angle
or type of a voltage source (magnetic VTs and CVTs). The figure shows zone 1 ground distance time curves for a 60 Hz system at nominal
system frequency.
LINE PICKUP
Phase instantaneous overcurrent:
Undervoltage pickup:
Overvoltage delay:
LINE CURRENT DIFFERENTIAL (87L)
Application:
Characteristic:
Pickup current level:
CT Tap (CT mismatch factor):
Slope # 1:
Slope # 2:
Level accuracy:
Breakpoint between slopes:
DTT:
Operating Time:
Asymmetrical channel delay compensation using GPS:
In-zone transformer group compensation: 0 to 330° in steps of 30°
Inrush inhibit level:
Inrush inhibit mode:
Zero-sequence current differential (87LG):
87LG pickup level:
87LG slope:
87LG pickup delay:
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
0.050 to 30.000 pu in steps of 0.001
97 to 98%
5 to 25 cycles in steps of 1
0 to 5.000 pu in steps of 0.001
0.020 to 30.000 pu
0.004 to 3.000 pu
0.000 to 65.535 s
2 or 3 terminal line, series compensated line, tapped line, with charging current compensation
Dual slope percent differential
0.20 to 4.00 pu in steps of 0.01
0.20 to 5.00 in steps of 0.01
1 to 50%
1 to 70%
±3% of reading of the maximum circuit current
0.0 to 20.0 pu in steps of 0.1
Direct Transfer Trip (1 and 3 pole) to remote L90
1.0 to 1.5 power cycles duration
asymmetry up to 10 ms
1.0 to 40.0%f in steps of 0.1
0
per-phase, 2-out-of-3, average
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
SPECIFICATIONS
2
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