Pickup1
PICKUP
TRIP
tReset1
t1
ANSI10000038-2-en.vsd
ANSI10000038 V2 EN-US
Figure 344: Example for Definite Time Delay stage 1 operation
9.3.7.3 Blocking
M15331-18 v6
It is possible to block Two step residual overvoltage protection ROV2PTOV (59N) partially or
completely, by binary input signals where:
BLOCK: blocks all outputs
BLKTR1: blocks all trip outputs of step 1
BLK1: blocks all pickup and trip outputs related to step 1
BLKTR2: blocks all trip outputs of step 2
BLK2: blocks all pickup and trip inputs related to step 2
9.3.7.4 Design
M15331-32 v6
The voltage measuring elements continuously measure the residual voltage. Recursive Fourier
filters filter the input voltage signal for the rated frequency. The single input voltage is compared
to the set value, and is also used for the inverse time characteristic integration. The design of Two
step residual overvoltage protection (ROV2PTOV, 59N) is schematically described in figure
345.
Section 9 1MRK 502 066-UUS B
Voltage protection
634
Technical manual
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