GE 845 Instruction Manual page 24

SPECIFICATIONS
1–14
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
Curve Timing Accuracy:.................................. at < 0.90 x pickup: ± 3.5% of curve delay or ± ½ cycle
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
Curve Timing Accuracy:.................................. at < 0.90 x pickup: ± 3.5% of curve delay or ± ½ cycle
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
Timer Accuracy:.................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
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
Timer Accuracy:.................................................. ± 3% of operate time or ± ½ cycle (whichever is greater)
< 25 ms at 0.90 x pickup at 50 Hz
(whichever is greater) from pickup to operate
< 25 ms at 0.90 x pickup at 50 Hz
(whichever is greater) from pickup to operate
< 30 ms at 1.1 x pickup at 50Hz
from pickup to operate
greater) from pickup to operate
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION