U1<
ST1
TR1
tReset1
t1
IEC10000040-3-en.vsd
IEC10000040 V3 EN-US
Figure 85: Example for Definite Time Delay stage 1 operation
7.3.3.3 Blocking
M15331-18 v7
It is possible to block two step residual overvoltage protection ROV2PTOV
partially or completely by binary input signals where:
BLOCK:
blocks all outputs
BLKTR1: blocks all trip outputs of step 1
BLKST1: blocks all start and trip outputs related to step 1
BLKTR2: blocks all trip outputs of step 2
BLKST2: blocks all start and trip inputs related to step 2
7.3.3.4 Design
M15331-32 v7
The voltage measuring elements continuously measure the residual voltage.
Recursive Fourier filters filter the input voltage signal for the rated frequency. The
residual voltage is compared to the set value, and is also used for the inverse time
characteristic integration. The design of the function is schematically described in
figure 86.
Section 7 1MRK 505 384-UEN A
Voltage protection
196 Breaker protection REQ650 2.2 IEC
Technical manual
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