GE 845 - Page 24

1–14 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
PHASE UNDERVOLTAGE (27P)
Voltage:....................................................................Fundamental Phasor Magnitude
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
Phases Required for Operation:...................Any one, Any two, All three
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 0.001s
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
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
PHASE OVERVOLTAGE (59P)
Voltage:....................................................................Fundamental Phasor Magnitude
Pickup Level: .........................................................0.02 to 3.00 x VT in steps of 0.01 x VT
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ...................................................±0.5% of reading from 10 to 208 V
Phases Required for Operation:...................Any one, Any two, All three
Pickup Time Delay: ............................................0.000 to 6000.000 s in steps of 0.001s (Definite Time)
Dropout Time Delay:.........................................0.000 to 6000.000 s in steps of 0.001s (Definite Time)
Pickup Accuracy: ................................................Per phase voltage input channel error
Operate Time: ......................................................< 25 ms at 1.1 x pickup at 60Hz
< 30 ms at 1.1 x pickup at 50Hz
Timer Accuracy:..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
AUXILIARY OVERVOLTAGE (59X)
Operating Parameter: ......................................Vx (Phasor)
Pickup Level: .........................................................0.00 to 3.00 x VT in steps of 0.01 x VT
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ...................................................±0.5% of reading from 10 to 240 V
Overvoltage Curves:..........................................Definite Time, Inverse Time, FlexCurves A/B/C/D
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
Pickup Accuracy: ................................................‘Auxiliary voltage input channel error
Operate Time: ......................................................< 30 ms at 1.1 x pickup at 60Hz
Curve Timing Accuracy:..................................at >1.1 x PKP: 3.5% of operate time ± ½ cycle (whichever is
greater) from pickup to operate
Timer Accuracy:..................................................± 3% of operate time or ± ½ cycle (whichever is greater)