Time
V
Normal voltage
Pickup1
Pickup2
IntBlkStVal1
IntBlkStVal2
Disconnection
tBlkUV1 <
t1,t1Min
tBlkUV2 <
t2,t2Min
Block step 1
Block step 2
en05000466_ansi.vsd
ANSI05000466 V1 EN
Figure 91:
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
PICKUP condition. The design of Two step undervoltage protection UV2PTUV (27) is
schematically shown in
.
1MRK 511 365-UUS A
Section 9
Voltage protection
Phasor measurement unit RES670 2.1 ANSI
281
Technical manual
Содержание Relion 670 Series RES670
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