1-6 735/737 Feeder Protection Relay
GE Power Management
1.3 SPECIFICATIONS 1 INTRODUCTION
1
1.3 SPECIFICATIONS 1.3.1 PROTECTION
PHASE TIME OVERCURRENT (51)
Pickup level: LO: 20 to 100% of CT ratin
or OFF
HI: 110 to 220% of CT ratin
or OFF
Curve Types: ANSI, IAC, IEC/BS142
Curve shapes: definite time, moderately inverse, normal, inverse, very inverse, extremely inverse.
See time/overcurrent curves; curves apply up to 20 x pickup or 20 x CT, whichever is less.
Time multiplier: 10 curves: #1 to #10 for each shape
4 shift multipliers: 0.5, 0.8, 1, 1.1
Definite time: 100 ms to 1 sec. in steps of 100 ms.
Reset: Time reset to zero each time current level falls below pickup threshold
Accuracy: Level: ±3% of settin
Time:
reater of ±3% or ±20ms at >150% of pickup
PHASE INSTANTANEOUS OVERCURRENT (50)
Pickup level: 4, 5, 6, 8, 10, 12, 14, 16, 20 × CT or OFF
Accuracy: Level: ±3% of settin
Time: 35ms maximum at >150% of pickup settin
GROUND TIME OVERCURRENT (51G/51N)
Pickup level: LO: 15 to 55% of CT ratin
in steps of 5% or OFF
HI: 60 to 100% of CT ratin
in steps of 5% or OFF
Curve Types: ANSI, IAC, IEC/BS142
Curve shapes: definite time, moderately inverse, normal, inverse, very inverse, extremely inverse.
See time/overcurrent curves; curves apply up to 20 × pickup or 20 × sensor, whichever is less.
Time multiplier: 10 curves: #1 to #10 for each shape
4 shift multipliers: 0.5, 0.8, 1, 1.1
Definite time: 100 ms to 1 sec. in steps of 100 ms
Reset: Time reset to zero each time current level falls below pickup
Accuracy: Level: ±3% of settin
Time:
reater of ±3% or ±20ms at >150% of pickup
GROUND INSTANTANEOUS OVERCURRENT (50G/50N)
Pickup level: 0.1, 0.2, 0.4, 0.8, 1, 2, 4, 8, 16, × CT or OFF
Accuracy: Level: ±3% of settin
Time: 35ms maximum at >150% of pickup settin
1.3.2 INPUTS
CURRENT INPUTS
Withstand Phase/Ground CTs:4 times rated current: continuous
20 times rated current: 5 second
40 times rated current: 2 second
Sensin
: True RMS; 16 samples/cycle
Secondary: 1 A or 5 A (must be specified with order)
Accuracy:
reater of 3% of CT primary or 3% of displayed
Drift: No
reater than 0.5% over 10 years
CT BURDEN
1 Amp inputs: 0.02 VA at 1 A; 0.2 VA at 5 A; 10 VA at 20 A
5 Amp inputs: 0.02 VA at 5 A; 0.2 VA at 20 A; 10 VA at 100 A
Conversion ran
e: 0 to 20 times CT primary
Frequency response: 48 to 300 Hz ± 3 dB
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