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Time delayed phase overvoltage
protection (TOV)
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The time delayed phase overvoltage protection, TOV is intended for single- and two-
phase systems and used to protect the equipment and its insulation against overvoltage.
In this way it prevents damage to the equipment in the power system or shortening of
their lifetime.
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The phase overvoltage protection function continuously measures the phase voltages
and initiates the corresponding output signal if the measured phase voltages exceed the
preset value (starting) and remain high longer than the time delay setting on the timers
(trip).
Figure 63 shows a simplified logic diagram of the overvoltage protection function.
TOV--BLKTR
TEST
TOV--TEST
&
Block TOV=Yes
TOV--BLOCK
TOV--STUL1N
TOV--STUL2N
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>1
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TOV--TRIP
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t
TOV--TRPE
TOV--STPE
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