Control; Monitoring - GE 845 Instruction Manual

CHAPTER 1: INTRODUCTION

Control

Monitoring

845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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
BREAKER CONTROL
Operation
(Remote Control): ..........................................Asserted Flexlogic Operand, Contact Input, Virtual Input,
Operation
(Local Control): ...............................................PB1, PB2, and PB3
Function: .................................................................Opens/closes the transformer breakers
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
SYNCHROCHECK (25)
Maximum Frequency Difference: ................0.01 to 5.00 Hz in steps of 0.01 Hz for frequency window of
Maximum Angle Difference: ..........................1° to 100° in steps of 1°
Maximum Voltage Difference: ......................10 to 600000 V in steps of 1 V
Hysteresis for Maximum Frequency
Difference:.........................................................0.01 to 0.10 Hz in steps of 0.01 Hz
Breaker Closing Time:.......................................0.000 to 6000.00 s in steps of 0.001 s
Dead Source Function:.....................................None, LB & DL, DB & LL, DB & DL, DB OR DL, DB XOR DL
Dead/Live Levels for Bus and Line:.............0.00 to 1.5 x VT in steps of 0.01 x VT
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: ± of reading or ± 0.4% of rated (whichever
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
HARMONIC DERATING
Timer Accuracy:...................................................±3% of delay setting or ±3 cycle (whichever is greater) from
Virtual Output, Remote Input
pickup to operate
f ± 5 Hz
nom
is greater),
For > 2.0 x CT: ± 1.5% of reading
pickup to operate
pickup to operate
SPECIFICATIONS
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