Time
U
Normal voltage
U1<
U2<
IntBlkStVal1
IntBlkStVal2
Disconnection
tBlkUV1 <
t1,t1Min
tBlkUV2 <
t2,t2Min
Block step 1
Block step 2
en05000466.vsd
IEC05000466 V1 EN
Figure 232:
Blocking function
9.1.7.4
Design
The voltage measuring elements continuously measure the three phase-to-neutral
voltages or the three phase-to-phase voltages. Recursive fourier filters or true RMS
filters of input voltage signals are used. The voltages are individually compared to the
set value, and the lowest 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
and
3 out of 3
criteria
to fulfill the START condition. The design of Two step undervoltage protection
UV2PTUV is schematically shown in
1MRK502052-UEN B
Section 9
Voltage protection
489
Technical manual
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