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SPECIFICATIONS
1–20
FAULT REPORTS
Number of Reports: ........................................... 15
Fault Location Method:.................................... Single-ended
Voltage Source: ................................................... Wye-connected VTs, Delta-connected VTs and neutral
Maximum Method Accuracy:........................ Fault resistance is zero or fault currents from all line
Relay Accuracy:................................................... ± 1.5% (V > 10 V, I > 0.1 pu)
Other Accuracy Factors: ................................. VT%error + user data
Captured Data: .................................................... Pre-fault and fault phasors for all CT and VT banks, pre-fault
FAULT LOCATOR
Method: ................................................................... Single-ended
Voltage Source: ................................................... Wye-connected VTs, Delta-connected VTs and neutral
Maximum Accuracy, (only if) :....................... fault resistance is zero or fault currents from all line
Relay Accuracy:................................................... ± 1.5% (V > 10 V, I > 0.1 pu)
Worst-case Accuracy: ...................................... VT%error + user data
DEMAND
Measured Values: ............................................... Phase A/B/C present and maximum current
Measurement Type:........................................... Thermal Exponential, 90% response time (programmed): 5,
Current Pickup Level: ........................................ 10 to 10000 in steps of 1 A
Dropout Level:...................................................... 96-98% of Pickup level
Level Accuracy:.................................................... ± 2%
TAP CHANGER FAILURE
Operating Parameter: ...................................... Tap Changer Position
Time Delay:............................................................ 0.00 to 600.00 s
Timer Accuracy: .................................................. ±3% of delay setting or ±2 cycles (whichever is greater) from
HARMONIC DETECTION
Operating Parameter: ...................................... Current 2
Timer Accuracy: .................................................. Harmonics: ±3% of delay setting or ±1/4 cycle (whichever is
voltage, delta-connected VTs and zero-sequence current
(approximation)
terminals are in-phase
CT%error + user data
ZLine%error + user data
and fault trigger operands, user-programmable analog
channels 1 to 32
voltage, delta-connected VTs and zero-sequence current
(approximation)
terminals are in-phase
ZLine%error + user data
RELAY ACCURACY%error + (1.5%)
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
pickup to operate
nd
rd
th
th
, 3
, 4
, 5
harmonic or THD per phase
greater) from pickup to operate
THD: ±3% of delay setting or ±3 cycles (whichever is greater)
from pickup to operate
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION
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