Blocking; Design - ABB RED650 Technical Manual

1MRK 505 394-UEN A
9.3.7.3
9.3.7.4
Line differential protection RED650 2.2 IEC
Technical manual
U1<
ST1
TR1
tReset1
t1
IEC10000040 V3 EN-US
Figure 124: Example for Definite Time Delay stage 1 operation

Blocking

It is possible to block two step residual overvoltage protection ROV2PTOV
partially or completely by binary input signals where:
BLOCK:
BLKTR1:
BLKST1:
BLKTR2:
BLKST2:

Design

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 125.
blocks all outputs
blocks all trip outputs of step 1
blocks all start and trip outputs related to step 1
blocks all trip outputs of step 2
blocks all start and trip inputs related to step 2
Section 9
Voltage protection
IEC10000040-3-en.vsd
M15331-18 v7
M15331-32 v7
263