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TUV--BLKTR
TEST
TUV--TEST
Block TUV=Yes
TUV--BLOCK
TUV--VTSU
TUV--STUL1N
TUV--STUL2N
Time delayed undervoltage protection
(TUV) for two sections (TUV1)
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The voltage measuring elements within one of the built-in digital signal processors con-
tinuously measure the phase-to-neutral voltage. Recursive Fourier filter filters the input
voltage signals and a separate trip counter prevents high overreaching or underreaching
of the measuring elements. If the voltage falls below the set value for a longer period
than the set delay the protection gives a trip command.
The undervoltage protection, TUV1, is blocked if the input signal TUV1-BLOCK is ac-
tivated. The trip output is blocked if the input signal TUV1-BLKTR is activated.
The signal TUV1-VTZU, which may be connected to the fuse-failure supervision func-
tion, prevents unwanted operation.
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TUV--TRIP
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TUV--START
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