GE Multilin 850, Instruction Manual

Page: 27 / 664

CHAPTER 1: INTRODUCTION SPECIFICATIONS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–17
AUXILIARY UNDERVOLTAGE (27X)
Operating Parameter:.......................................Vx (Phasor)
Minimum Voltage:...............................................0.00 to 1.50 x VT in steps of 0.01 x VT
Pickup Level:..........................................................0.00 to 1.50 x VT in steps of 0.01 x VT
Dropout Level: ......................................................102 to 103% of Pickup
Level Accuracy:....................................................± 0.5% of reading from 10 to 208 V
Undervoltage Curves: .......................................Definite Time, GE IAV Inverse Time or FlexCurves A/B/C/D
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Operate Time:.......................................................< 20 ms at 0.90 x pickup at 60 Hz
< 25 ms at 0.90 x pickup at 50 Hz
Curve Timing Accuracy: ..................................at < 0.90 x pickup: ± 3.5% of curve delay or ± ½ cycle
(whichever is greater) from pickup to operate
BROKEN CONDUCTOR
Minimum Operating Positive Current:.......0.05 to 1.00 x CT in steps of 0.01 x CT
Maximum Operating Positive Current:......0.05 to 5.00 x CT in steps of 0.01 x CT
Pickup Level:..........................................................20.0% to 100.0% in steps of 0.1%
Dropout Level: ......................................................97% to 98% of the Pickup Level
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Timer Accuracy: ..................................................± 3% of delay setting or ± ¾ cycle (whichever is greater)
from pickup to operate
DIRECTIONAL POWER (32)
Measured Power: ................................................3-phase
Number of Stages:..............................................2
Characteristic Angle:.........................................0
º
to 359
º
in steps of 1°
Calibration Angle: ...............................................0.00
º
to 0.95
º
in steps of 0.05°
Power Pickup Range:.........................................–1.200 to 1.200 x Rated Power in steps of 0.001
Pickup Level Accuracy: ....................................± 1% or ± 0.001 x Rated Power, whichever is greater
Hysteresis:..............................................................2% or 0.001 x Rated Power, whichever is greater
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Operate Time:.......................................................< 55 ms at 1.1 x pickup at 60 Hz
< 65 ms at 1.1 x pickup at 50 Hz
Timer Accuracy: ..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
FAST UNDERFREQUENCY
Operating Parameter:.......................................Frequency and rate of change of frequency
UF Pickup Level:...................................................20.00 to 65.00 Hz in steps of 0.01 Hz
df/dt Pickup Level: ..............................................-10.00 to -0.10 Hz/s in steps of 0.01 Hz/s
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Dropout Time Delay: .........................................0.000 to 6000.000 s in steps of 0.001 s
Frequency Accuracy:........................................250 mHz/s or 3.5%, whichever is greater
Timer Accuracy: ..................................................± 3% of operate time or ± ¼ cycle (whichever is greater)
FLEXELEMENTS
Number of elements: ........................................8
Operating signal:.................................................Any analog actual value, or two values in a differential mode
Operating signal mode: ...................................Signed, or Absolute value
Operating mode: .................................................Level, Delta
Comparison direction: ......................................Over, Under
Pickup Level:..........................................................-30.000 to 30.000 pu in steps of 0.001 pu
Hysteresis:..............................................................0.1 to 50.0% in steps of 0.1%
Delta dt: ...................................................................40 msec to 45 days
Pickup and dropout delays:...........................0.000 to 6000.000 s in steps of 0.001 s