GE 869 - Page 25

CHAPTER 1: INTRODUCTION SPECIFICATIONS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 1–15
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 Ω in steps of 0.01 Ω
Left and Right Blinders (sec.): ........................0.10 to 500.00 Ω in steps of 0.01 Ω
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)
OVERFREQUENCY (81O)
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 0.001 s
Dropout Time Delay: .........................................0.000 to 6000.000 s in steps of 0.001 s
Minimum Operating Voltage: ........................0.000 to 1.250 x VT in steps of 0.001 x VT
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.
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
PERCENT DIFFERENTIAL (87S)
Methods: .................................................................Internal summation and Core balance
Pickup Level:..........................................................0.05 to 1.00 x CT in steps of 0.01
Slope 1 and 2:.......................................................1 to 100% in steps of 1
Break 1:....................................................................0.50 to 2.00 x CT in steps of 0.01
Break 2:....................................................................2.00 to 30.00 x CT in steps of 0.01
Operate Time:.......................................................<16 ms at >3 × Pickup at 60 Hz;
<20 ms at >3 × Pickup at 50 Hz
PHASE DIRECTIONAL OVERCURRENT (67P)
Relay Connection: ..............................................90º(Quadrature)
Quadrature Voltage:..........................................ABC phase seq.: phase A (Vbc), phase B (Vca), phase C (Vab);
ACB phase seq.: phase A (Vcb), phase B (Vac), phase C (Vba)
Polarizing Voltage Threshold:........................0.050 to 3.000 x VT in steps of 0.001 x VT
Current Sensitivity Threshold:.......................0.05 x CT
Characteristic Angle:.........................................0º to 359º in steps of 1°
Angle Accuracy: ..................................................± 2º
Operation Time (FlexLogic™ operands): ..Reverse to Forward transition: < 12 ms, typically;
Forward to Reverse transition: <8 ms, typically