Pickup1
PICKUP
TRIP
tReset1
t1
ANSI10000038-2-en.vsd
ANSI10000038 V2 EN
Figure 269: Example for Definite Time Delay stage 1 operation
8.3.2.3 Blocking
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
8.3.2.4 Design
The voltage measuring elements continuously measure the residual voltage. Recursive
Fourier filters filter the input voltage signal. 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
270.
Section 8 1MRK505222-UUS C
Voltage protection
524
Technical reference manual
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