ABB REG670 - Blocking

U1<
ST1
TR1
tReset1
t1
IEC10000040-3-en.vsd
IEC10000040 V3 EN
Figure 247: Example for Definite Time Delay stage 1 operation
9.3.7.3 Blocking
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
9.3.7.4 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) is
schematically described in figure 248.
Section 9 1MRK502052-UEN B
Voltage protection
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Technical manual