Blocking - ABB RES670 Technical Manual

1MRK 511 408-UUS A
9.2.7.3
9.2.7.4
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Pickup1
PICKUP
TRIP
tReset1
t1
ANSI10000038 V2 EN-US
Figure 102: Example for Definite Time Delay stage 1 operation

Blocking

It is possible to block Two step overvoltage protection OV2PTOV, (59) partially or
completely, by binary input signals where:
BLOCK:
BLKTR1:
BLK1:
BLKTR2:
BLK2:
Design
The voltage measuring elements continuously measure the three phase-to-ground
voltages or the three phase-to-phase voltages. Recursive Fourier filters or true RMS
filters of input voltage signals are used. The phase voltages are individually compared
to the set value, and the highest voltage is used for the inverse time characteristic
integration. A special logic is included to achieve the 1 out of 3, 2 out of 3 or 3 out of 3
criteria to fulfill the PICKUP condition. The design of Two step overvoltage protection
(OV2PTOV, 59) is schematically described in figure 103.
blocks all outputs
blocks all trip outputs of step 1
blocks all pickup and trip outputs related to step 1
blocks all trip outputs of step 2
blocks all pickup and trip outputs related to step 2
Section 9
Voltage protection
ANSI10000038-2-en.vsd
M15330-20 v8
M15330-34 v8
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