GE 889 - Monitoring

1–22 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
TRIP BUS
Number of Elements: ........................................6
Number of Inputs: ..............................................16
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
Operate Time: ...................................................... < 2 ms at 60 Hz
Timer Accuracy:..................................................± 3% of delay time or ± ¼ cycle (whichever is greater) from
pickup to operate
Monitoring
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 FAILURE
Mode:........................................................................ 3-pole
Current Supervision:..........................................phase and neutral current (fundamental phasor magnitude)
Current Supervision Pickup:...........................0.050 to 30.000 x CT in steps of 0.001 x CT
Current Supervision Dropout: .......................97 to 98% of pickup
Current Supervision Accuracy: ....................For 0.1 to 2.0 x CT: ± 0.5% of reading or ± 0.4% of rated
(whichever is greater),
For > 2.0 x CT: ± 1.5% of reading
Time Delay: ...........................................................0.000 to 6000.000 s in steps of 0.001 s
Timer Accuracy:..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
Reset Time:............................................................< 10 ms typical at 2 x Pickup at 60 Hz
< 12 ms typical at 2 x Pickup at 50 Hz
BREAKER HEALTH
Timer Accuracy:..................................................± 3% of delay setting or ± 1 cycle (whichever is greater) from
pickup to operate
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
DEMAND
Measured Values: ...............................................Phase A/B/C present and maximum current
Measurement Type:...........................................Thermal Exponential, 90% response time (programmed): 5,
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
Current Pickup Level: ........................................ 10 to 10000 in steps of 1 A
Dropout Level:......................................................96-98% of Pickup level
Level Accuracy: ................................................... ± 2%
FAULT REPORTS
Number of Reports: ...........................................15
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