BLOCK: blocks all outputs
BLK1: blocks all pickup and trip outputs related to step 1
BLK2: blocks all pickup and trip outputs related to step 2
7.2.7.4 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 73.
1MRK 511 287-UUS A Section 7
Voltage protection
179
Technical manual
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