GE Multilin 850 - Page 28

1–18 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
SENSITIVE GROUND TIME OVERCURRENT (51SG)
Operating Parameter: ......................................Isg (RMS or Fundamental)
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
0.50 to 15.00 A in steps of 0.01 A (For 50:0.025)
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ................................................... For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4%of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
Level Accuracy: ................................................... For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4%of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
For 50:0.025: ±0.1A for 0.5A to 4A; ±0.2A for >4A
Dropout Level:......................................................97 to 98% of Pickup
Curve Shape:.........................................................IEEE Extremely/Very/Moderately Inverse
ANSI Extremely/Very/Normally/Moderately Inverse
IEC A/B/C and Short Inverse
IAC Extreme/Very/Inverse/Short Inverse
I2t, I4t, FlexCurve A/B/C/D, Definite Time
Curve Multiplier: ..................................................0.05 to 600.00 in steps of 0.01
Reset Time: ............................................................Instantaneous, Timed
Curve Timing Accuracy:.................................. Currents > 1.03 to 20 x pickup: ± 3% of operate time or
± ½ cycle (whichever is greater) from pickup to operate
SENSITIVE GROUND INSTANTANEOUS OVERCURRENT (50SG)
Operating Parameter: ......................................Isg (Fundamental Phasor Magnitude)
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ................................................... For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
Level Accuracy: ................................................... For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
Operate Time: ......................................................< 12 ms at 3 × Pickup at 60 Hz
Timer Accuracy:.................................................. ±3% of operate time or ± ¼ cycle (whichever is greater)
SENSITIVE GROUND INSTANTANEOUS OVERCURRENT (50SG)
Operating Parameter: ......................................Isg (Fundamental Phasor Magnitude)
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
Pickup Level: .........................................................0.005 to 3.000 xCT in steps of 0.001 xCT
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ................................................... For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
Level Accuracy: ................................................... For 0.1 to 2.0 xCT: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
For > 2.0 xCT: ±1.5% of reading > 2.0 xCT rating
Operate Time: ......................................................< 12 ms at 3 × Pickup at 60 Hz
Timer Accuracy:.................................................. ±3% of operate time or ± ¼ cycle (whichever is greater)