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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-US
Figure 133:
Blocking function
8.1.7.4
Design
M15326-35 v9
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
.
1MRK 506 382-UEN A
Section 8
Voltage protection
Line distance protection REL650 2.2 IEC
271
Technical manual
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