GE 889 - Page 29

CHAPTER 1: INTRODUCTION SPECIFICATIONS
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 1–19
OUT-OF-STEP (78)
Characteristic:......................................................Single blinder with offset mho supervisory
Measured Impedance:......................................Positive-sequence
Current Supervision Pickup Level:...............0.05 to 10.00 x CT in steps of 0.01 x CT
Fwd/Reverse Reach (sec.): ..............................0.10 to 500.00  in steps of 0.01 
Left and Right Blinders (sec.): ........................0.10 to 500.00  in steps of 0.01 
Impedance Accuracy: ......................................±5%
Blinder RCA:...........................................................40 to 90º in steps of 1º
Angle Accuracy: ..................................................± 2º
Timer Accuracy: ..................................................±3% of operate time or ±¼ cycle (whichever is greater)
DIRECTIONAL POWER (32)
Measured Power: ................................................3-phase
Number of Stages:..............................................2
Characteristic Angle:.........................................0º to 359º in steps of 1°
Calibration Angle: ...............................................0.00º to 0.95º in steps of 0.05°
Power Pickup Range:.........................................–1.200 to 1.200 x Rated Power in steps of 0.001
Pickup Level Accuracy: ....................................± 1% or ± 0.001 x Rated Power, whichever is greater
Hysteresis:..............................................................2% or 0.001 x Rated Power, whichever is greater
Pickup Time Delay:.............................................0.000 to 6000.000 s in steps of 0.001 s
Operate Time:.......................................................< 55 ms at 1.1 x pickup at 60 Hz
< 65 ms at 1.1 x pickup at 50 Hz
Timer Accuracy: ..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
REACTIVE POWER (40Q)
Operating Condition:.........................................Three-phase reactive power
Positive/Negative var Trip/Alarm Pickup
Level:....................................................................0.02 to 2.00 x Rated in steps of 0.01
Positive/Negative var Trip/Alarm Pickup
Level:....................................................................1 to 25000 kvar in steps of 1 kvar
Pickup Level Accuracy: ....................................±1.0% of reading
Positive/Negative var Trip/Alarm Pickup
Delay:..................................................................0.00 to 600.00 s in steps of 0.01 s
Timer Accuracy: ..................................................±3.0% of delay time or ±10 ms, whichever is greater
Hysteresis:..............................................................2 to 3%
Operate Time:.......................................................< 45 ms at 60 Hz
< 50 ms at 50 Hz
Elements: ................................................................Trip and Alarm
UNDERFREQUENCY (81U)
Pickup Level:..........................................................20.00 to 65.00 Hz in steps of 0.01
Dropout Level: ......................................................Pickup + 0.03 Hz
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
Minimum Operating Voltage: ........................0.000 to 1.250 x VT in steps of 0.001 x VT
Minimum Operating Current: ........................0.000 to 30.000 x CT in steps of 0.001 x CT
Level Accuracy:....................................................± 0.001 Hz
Timer Accuracy: ..................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
Operate Time:.......................................................typically 7.5 cycles at 0.1 Hz/s change
typically 7 cycles at 0.3 Hz/s change
typically 6.5 cycles at 0.5 Hz/s change
FAST PATH:
Typical times are average Operate Times including variables such as frequency change
instance, test method, etc., and may vary by ± 0.5 cycles.