GE Multilin 850

1–20 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
UNDERCURRENT (37)
Operating Parameter: ......................................Per-phase current Ia, Ib, Ic (Phasor)
Trip/Alarm Pickup Level:..................................0.05 to 0.95 x CT in steps of 0.01 x CT
Dropout Level:......................................................102 to 103% of Pickup
Trip/Alarm Delay:................................................0.00 to 180.00 s in steps of 0.01 s
Pickup Accuracy: ................................................For 0.05 to 2.0 x CT: ±0.5% of reading or ±0.4% of rated,
whichever is greater
Operate Time: ......................................................<45 ms at 60 Hz,<50 ms at 50 Hz
Timer Accuracy:.................................................. ±3% of delay setting or ± 2 power cycles (whichever is
greater) from pickup to operate
Stages: .....................................................................Trip and Alarm
No. of Elements:...................................................3
UNDERFREQUENCY (81U)
Pickup Level: .........................................................20.00 to 65.00 Hz in steps of 0.01
Dropout Level:......................................................Pickup + 0.03 Hz
Pickup Time Delay: ............................................0.000 to 6000.000 s in steps of 0.001s
Dropout Time Delay:.........................................0.000 to 6000.000 s in steps of 0.001s
Minimum Operating Voltage:........................0.000 to 1.250 x VT in steps of 0.001 x VT
Minimum Operating Current:........................0.000 to 30.000 x CT in steps of 0.001 x CT
Level Accuracy: ................................................... ± 0.001 Hz
Timer Accuracy:.................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
Operate Time: ......................................................typically 7.5 cycles at 0.1 Hz/s change
typically 7 cycles at 0.3 Hz/s change
typically 6.5 cycles at 0.5 Hz/s change
FAST PATH:
Typical times are average Operate Times including variables such as frequency change
instance, test method, etc., and may vary by ± 0.5 cycles.
UV REACTIVE POWER (27Q)
Protection Function
Voltages: .................................................................Phasor only
Pickup Voltage: ....................................................0.00 to 1.50 x VT in steps of 0.01
Pickup Vars:...........................................................1 to 65000 Kvar in steps of 1 Kvar
Dropout Level:......................................................103% of pickup for Undervoltage
97% of pickup for Over Reactive Power
103% of pickup for Under Reactive Power
Level Accuracy: ................................................... ±0.5% of reading or ±2V (secondary), whichever is greater
Pickup Time Delay: ............................................ 0.000 to 600.000 s in steps of 0.001
Timer Accuracy:.................................................. ±3% of the delay setting time or ±½ cycle (whichever is
greater) from pickup to operate
Current Supervision Level:..............................0.00 to 0.20 x CT in steps of 0.01
Stages: ..................................................................... Trip, Alarm and Configurable
Restoration Function
Min Voltage:...........................................................0.05 to 1.50 x VT in steps of 0.01
Min/Max Frequency: .........................................20.00 to 65.00 Hz in steps of 0.01
Restore Time Delay: ..........................................0.00 to 6000.00 s in steps of 0.01
Stages: ..................................................................... Close and Configurable