GE Multilin 850 Instruction Manual page 30

SPECIFICATIONS
FASTPATH:
1–20
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,
Operate Time: ...................................................... <45 ms at 60 Hz,<50 ms at 50 Hz
Timer Accuracy:.................................................. ±3% of delay setting or ± 2 power cycles (whichever is
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)
Operate Time: ...................................................... typically 7.5 cycles at 0.1 Hz/s change
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
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
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
whichever is greater
greater) from pickup to operate
from pickup to operate
typically 7 cycles at 0.3 Hz/s change
typically 6.5 cycles at 0.5 Hz/s change
97% of pickup for Over Reactive Power
103% of pickup for Under Reactive Power
greater) from pickup to operate
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION