Protection Elements - GE L30 Instruction Manual

CHAPTER 2: PRODUCT DESCRIPTION

2.6.1 Protection elements

The operating times include the activation time of a trip rated form-A output contact unless otherwise indicated. FlexLogic
operands of a given element are 4 ms faster. Take this into account when using FlexLogic to interconnect with other
protection or control elements of the relay, building FlexLogic equations, or interfacing with other intelligent electronic
devices (IEDs) or power system devices via communications or different output contacts. If not specified, the operate times
given here are for a 60 Hz system at nominal system frequency. Operate times for a 50 Hz system are 1.2 times longer.
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:
87LG 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:
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
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
1.5 to 2.5 cycles
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
SPECIFICATIONS
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