1–18 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 1: INTRODUCTION
FREQUENCY RATE OF CHANGE (81R)
df/dt Trend:............................................................Increasing, Decreasing, Bi-directional
df/dt Pickup Level:..............................................0.10 to 15.00 Hz/s in steps of 0.01 Hz/s
df/dt Dropout Level: ..........................................96% of Pickup Level
df/dt Level Accuracy:........................................80 mHz/s or 3.5%, whichever is greater
Minimum Frequency:........................................20.00 to 80.00 Hz in steps of 0.01 Hz
Maximum Frequency: ......................................20.00 to 80.00 Hz in steps of 0.01 Hz
Minimum Voltage Threshold: ........................0.000 to 1.250 x VT in steps of 0.001 x VT
Minimum Current Threshold: ........................0.000 to 30.000 x CT in steps of 0.001 x CT
Pickup Time Delay: ............................................ 0.000 to 6000.000 s in steps of 0.001 s
Timer Accuracy:.................................................. ± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
95% Settling Time for df/dt: ..........................< 24 cycles
Operate Time: ......................................................typically 10 cycles at 2 × Pickup
GROUND DIRECTIONAL OVERCURRENT (67G)
Directionality: .......................................................Co-existing forward and reverse
Polarizing:...............................................................Voltage, Current, Dual
Polarizing Voltage:..............................................V_0 or VX
Polarizing Current:..............................................Isg
Operating Current:.............................................Ig
Level Sensing:.......................................................Ig, Isg
Characteristic Angle:.........................................-90º to 90º in steps of 1°
Limit Angle:............................................................40º to 90º in steps of 1°, independent for forward and
reverse
Angle Accuracy: ..................................................±2º
Pickup Level: .........................................................0.050 to 30.000 x CT in steps of 0.001
Dropout Level:......................................................97 to 98%
Operate Time (no direction transition): .... < 12 ms typical at 3 x Pickup at 60 Hz
< 15 ms typical at 3 x Pickup at 50 Hz
LOAD ENCROACHMENT
Operating Parameter: ......................................Positive sequence impedance (V1/I1)
Reach (in secondary Ω): ..................................0.02 to 250.00 Ω in steps of 0.01Ω
Angle:........................................................................ 5º to 50º in steps of 1°
Minimum Voltage: ..............................................0.00 to 1.50 x VT in steps of 0.01 x VT
Impedance Accuracy: ......................................± 5%
Angle Accuracy: ..................................................± 2º
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
Operate Time: ......................................................<20 ms at 1.1 x pickup at 60 Hz
<24 ms at 1.1 x pickup at 50 Hz
Timing Accuracy:................................................± 3% of delay setting or ± ¼ cycle (whichever is greater)
from pickup to operate
To Next Page
Loading...
