GE G60 Instruction Manual page 35

CHAPTER 2: PRODUCT DESCRIPTION
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:
PHASE DIRECTIONAL OVERCURRENT
Relay connection:
Quadrature voltage:
Polarizing voltage threshold:
Current sensitivity threshold:
Characteristic angle:
Angle accuracy:
Operation time (FlexLogic operands):
Tripping (reverse load, forward fault): <12 ms, typically
Blocking (forward load, reverse fault): <8 ms, typically
NEUTRAL DIRECTIONAL OVERCURRENT
Directionality:
Polarizing:
Polarizing voltage:
Polarizing current:
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
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)
°
90 (quadrature)
ABC phase seq.: phase A (V ), phase B (V
BC
B (V ), phase C (V )
AC BA
0.004 to 3.000 pu in steps of 0.001
0.05 pu
°
0 to 359 in steps of 1
±2°
Co-existing forward and reverse
Voltage, Current, Dual, Dual-V, Dual-I
V_0 or VX
IG
), phase C (V ); ACB phase seq.: phase A (V
CA AB
SPECIFICATIONS
2
), phase
CB
2-21