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Some of the most common applications of the TOV when operating as an
undervoltage relay are:
1. Instantaneous detection of undervoltage in automatic transfer equipment.
2. Fault detection for line protection equipment with a communication channel. If the line
has three terminals, and one of them does not contribute to the fault.
Some of the most common applications of the TOV when operating as an overvoltage
relay are:
1. Time delay devices, in which operation security depends on the voltage.
2. Protection against overvoltage in a three phase system, with the possibility of being
delayed from 100 ms up to 25.5 s.
3. Protection against a phase to ground fault in three phase systems with an insulated
ground and in ground fault protection of AC rotating machines.
GEK-98834B
6
$33/,&$7,21
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