Protection Elements - GE L90 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.
PHASE DISTANCE
Characteristic:
Number of zones:
Directionality:
Reach (secondary Ω):
Reach accuracy:
Zone 1:
Zones 2 to 5:
Distance:
Characteristic angle:
Comparator limit angle:
Directional supervision:
Characteristic angle:
Limit angle:
Right blinder (Quad only):
Reach:
Characteristic angle:
Left Blinder (Quad only):
Reach:
Characteristic angle:
Time delay:
Timer accuracy:
Current supervision:
Level:
Pickup:
Dropout:
Memory duration:
VT location:
CT location:
Voltage supervision pickup (series compensation applications):
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
mho (memory polarized or offset) or quad (memory polarized or non-directional), selectable indi-
vidually per zone
5
forward, reverse, or non-directional
0.02 to 500.00 Ω in steps of 0.01
±5% including the effect of CVT transients up to an SIR of 30 and ±7% for 30<SIR< 60 at RCA
angle
±5% for steady fault conditions
30 to 90° in steps of 1
30 to 90° in steps of 1
30 to 90° in steps of 1
30 to 90° in steps of 1
0.02 to 500 Ω in steps of 0.01
60 to 90° in steps of 1
0.02 to 500 Ω in steps of 0.01
60 to 90° 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)
line-to-line current
0.050 to 30.000 pu in steps of 0.001
97 to 98%
5 to 25 cycles in steps of 1
all delta-wye and wye-delta transformers
all delta-wye and wye-delta transformers
0 to 5.000 pu in steps of 0.001
SPECIFICATIONS
2
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