Hi-Z Voltage Supervision Algorithm - GE F60 Instruction Manual
Ur series.
feeder protection system
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Also See for F60:
- Instruction manual (724 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (680 pages)
Table of Contents
8.1 HIGH-IMPEDANCE (HI-Z) FAULT DETECTION
8 THEORY OF OPERATION
8.1.13 HI-Z VOLTAGE SUPERVISION ALGORITHM
This algorithm was implemented to minimize the probability of a false Hi-Z indication due to bus voltage dips (e.g. from par-
allel feeder faults). A fault on a parallel line can cause voltage dips that will produce a decrease in the line load which can
be mistaken by Hi-Z element as Loss of Load.
Every two cycle the voltage on each phase is checked against the
. If the voltage on any phase has
HI-Z V SUPV THRESHOLD
dropped by a percentage greater then or equal to this setting, the Loss of Load flag will be blocked. The blocking is not
done on a per- phase basis. If one phase voltage shows a dip, the block is applied for all phases. Also the High Impedance
Oscillography will record that a voltage dip was experienced. The Oscillography record is phase specific.
8
8-4
F60 Feeder Protection System
GE Multilin
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