tReset1
U1>
START
TRIP
t1
IEC10000038-2-en.vsd
IEC10000038 V2 EN
Figure 240:
Example for Definite Time Delay stage 1 operation
9.2.7.3
Blocking
It is possible to block Two step overvoltage protection OV2PTOV 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 outputs related to step 2
9.2.7.4
Design
The voltage measuring elements continuously measure the three phase-to-earth
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 START condition. The design of Two step overvoltage protection
(OV2PTOV) is schematically described in figure
Section 9
1MRK502052-UEN B
Voltage protection
502
Technical manual
Содержание Relion REG670
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