GE 850 User Manual

1–28 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
Monitoring
HARMONIC DERATING
Timer Accuracy:.................................................. ±3% of delay setting or ±3 cycle (whichever is greater) from
pickup to operate
TRIP CIRCUIT MONITOR (TCM)
Applicable Voltage:............................................20 to 250 VDC
Trickle Current:.....................................................1 to 2.5 mA
Timing Accuracy:................................................ ± 3 % or ± 4 ms, whichever is greater
CLOSE CIRCUIT MONITOR (CCM)
Applicable Voltage:............................................20 to 250 VDC
Trickle Current:.....................................................1 to 2.5 mA
Timing Accuracy:................................................ ± 3 % or ± 4 ms, whichever is greater
BREAKER ARCING CURRENT
Mode:........................................................................3-pole
Principle: .................................................................accumulates breaker duty (I
2
t) during fault
Initiation:.................................................................any operand
Alarm Threshold:.................................................0 to 50000 kA2-cycle in steps of 1 kA2-cycle
Timer Accuracy:.................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
BREAKER HEALTH
Timer Accuracy:..................................................± 3% of delay setting or ± 1 cycle (whichever is greater) from
pickup to operate
POWER FACTOR (55)
Switch-In Level:....................................................0.01 Lead to 1 to 0.01 Lag in steps of 0.01
Dropout Level:......................................................0.01 Lead to 1 to 0.01 Lag in steps of 0.01
Delay: ....................................................................... 0.000 to 6000.000 s in steps of 0.001 s
Minimum Operating Voltage:........................0.00 to 1.25 x VT in steps of 0.01 x VT
Level Accuracy: ...................................................± 0.02
Timer Accuracy:.................................................. ± 3% of delay setting or ± 1¼ cycle (whichever is greater)
from pickup to operate
FAULT REPORTS
Number of Reports: ........................................... 15
Fault Location Method:....................................Single-ended
Voltage Source:....................................................Wye-connected VTs, Delta-connected VTs and neutral
voltage, delta-connected VTs and zero-sequence current
(approximation)
Maximum Method Accuracy:........................Fault resistance is zero or fault currents from all line
terminals are in-phase
Relay Accuracy: .................................................. ± 1.5% (V > 10 V, I > 0.1 pu)
Other Accuracy Factors:.................................VT%error + user data
CT%error + user data
ZLine%error + user data
Captured Data: ....................................................Pre-fault and fault phasors for all CT and VT banks, pre-fault
and fault trigger operands, user-programmable analog
channels 1 to 32

GE 850 Specifications

General

Brand	GE
Model	850
Category	Protection Device
Language	English