REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-217
The protection monitors the voltages of the two v.t’s 1 and 2:
In the event of a fault (in this example an open-circuit lead in the
circuit of v.t. 1), the protection function detects an unbalance and
after the set delay time generates the tripping signals ‘Trip’ and
‘Trip-Line1’.
These then initiate blocking of the metering and protection de-
vices (such as underimpedance, voltage-controlled overcurrent
and distance protections etc.) connected to v.t. 1.
Typical settings:
Max. voltage difference (V-Unbalance) 0.20 U
N
Delay 0.04 s
Reset time (t-Reset) 0.50 s
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