GE 889 - Page 24

1–14 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
THIRD HARMONIC NEUTRAL UNDERVOLTAGE
Operating Quantity: ..........................................3
rd
harmonic of auxiliary voltage
Pickup Level: .........................................................0.10 to 20.00 V secondary in steps of 0.01
Dropout Level:......................................................103% of pickup for >5V; (pickup + 0.15V) for <5V
Level Accuracy: ...................................................+/-5% of reading for >0.5V up to 45V secondary; 30mV for
<0.5V
Pickup Time Delay: ............................................0.00 to 600.00 s in steps of 0.01
Timer Accuracy:..................................................± 3% of the delay setting time or ± ½ cycle (whichever is
greater) from pickup to operate
Power Inhibit Pickup Level:.............................0.000 to 1.250 x Rated in steps of 0.001
Power Inhibit Dropout Level:......................... 102 to 103% of pickup for maximum blocking power
97 to 98% of pickup for minimum blocking power
Power Level Accuracy:.....................................±1% of reading or ±0.0025 of rated whichever is greater
Blocking Low Voltage Level: ..........................0.00 to 1.50 x VT in steps of 0.01
Blocking Low Voltage Dropout Level:........102 to 103% of pickup for blocking low voltage level
Blocking Low Voltage Accuracy:.................± 0.5% of reading from 10 to 208 V
Operate Time: ......................................................< 30 ms @ 0.90 x Pickup @ 60 Hz
< 36 ms @ 0.90 x Pickup @ 50 Hz
Elements:................................................................Trip and Alarm
THIRD HARMONIC VOLTAGE DIFFERENCE
Operating Quantity: ..........................................
Pickup Level: .........................................................0.005 to 0.900 in steps of 0.001
Level Accuracy: ................................................... ± 0.02 pu
Dropout Level:......................................................103% of Pickup for > 0.333; (Pickup+0.010) for <0.333
97% of (1-Pickup) for >0.333; (1-Pickup)-0.010 for <0.333
Voltage Supervision Level:..............................0.5 to 30.0 V in steps of 0.1
Supervision Level Accuracy: .........................± 5% of reading for >1V up to 45 V secondary; 0.07 V for <1V
Supervision Dropout Level:............................97% of pickup for >7V; (Pickup – 0.2V) for <7V
Pickup Time Delay: ............................................0.00 to 600.00 s in steps of 0.01
Timer Accuracy:..................................................± 3% of the delay setting time or ± ½ cycle (whichever is
greater) from pickup to operate
Operate Time: ......................................................< 30 ms @ 0.90 x Pickup @ 60 Hz
< 36 ms @ 0.90 x Pickup @ 50 Hz
OFFLINE OVERCURRENT
Pickup Level: .........................................................0.05 to 1.00 x CT in steps of 0.01 of any one phase
Time Delay: ...........................................................0.00 to 600.00 s in steps of 0.01 s
Pickup Accuracy: ................................................as per Phase Current Inputs
Operate Time: ......................................................< 12 ms at 3 x Pickup at 60 Hz
Timer Accuracy:..................................................±3% of operate time or ±¼ cycle (whichever is greater)
OVERLOAD ALARM
Operating Parameter: ......................................Average phase current (RMS)
Pickup Level: .........................................................0.50 to 3.00 x FLA in steps of 0.01 x FLA
Dropout Level:......................................................97 to 98% of Pickup
Level Accuracy: ...................................................For 0.1 to 2.0 x CT: ±0.5% of reading or ±0.4% of rated,
whichever is greater; For > 2.0 × CT rating ±1.5% of reading
Pickup Delay:........................................................0.00 to 180.00 s in steps of 0.01 s
Dropout Delay:.....................................................0.00 to 180.00 s in steps of 0.01 s
Timer Accuracy:..................................................±3% of delay setting or ± ½ cycle (whichever is greater) from
pickup to operate