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152
Intercircuit bridging protection (TOVI)
TOVI-BLOCK
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The output operates if the voltage becomes higher than the set operate value U> under
a time exceeding the set definite time delay t.
An external signal connected to the input TOVI-BLOCK may block the function.
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The parameters for the intercircuit bridging protection function are set via the local
HMI or PST (Parameter Setting Tool). Refer to the Technical reference manual for set-
ting parameters and path in local HMI.
If set frequency is 50 Hz then the operate voltage (U4) must be set higher than the high-
est permitted 16 2/3 Hz voltage on the line. If set frequency is 16 2/3 Hz then the operate
voltage (U1) must be set higher than the highest permitted 50 Hz voltage on the line. A
safety margin of at least 10 % in addition to the inaccuracies of the voltage transformer
and the measuring function is recommended.
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TOVI-TRIP
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