GE D60 Instruction Manual page 37

CHAPTER 2: PRODUCT DESCRIPTION
Level:
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:
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:
D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
neutral current (3I_0)
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
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
SPECIFICATIONS
2
2-23