ABB REG316 4 Series Operating Instructions Manual page 253

REG 316*4 1MRB520049-Uen / Rev. F
E. Setting instructions
Settings:
Max. voltage difference
Delay
Reset delay
The balanced voltage function is intended mainly for detecting
voltage measurement errors by other devices.
It compares the voltages (amplitudes) of two generally identical
voltage sources connected to the same busbar phase-by-phase.
The function picks up when the difference between voltages of
the same phase exceeds a set pick-up value (V-Unbalance).
A tripping signal is emitted for the source with the lower voltage
(Trip-Line1 or Trip-Line2) and a general tripping signal (Trip)
generated after a set time delay (Delay), providing the tripping
condition remains fulfilled throughout the delay time. These
signals are available for blocking protection and instrumentation
connected to the faulty source and thus prevent false tripping or
measurements.
The tripping signals are maintained for the setting of the reset
time (t-Reset) after the tripping condition is no longer fulfilled.
The function is thus suitable for detecting v.t. circuit faults (fuse
failure) and faults on the protection and metering circuits con-
nected to them.
ABB Switzerland Ltd
V-Unbalance
Delay
t-Reset
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