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-US
Figure 94:
Blocking function
9.1.7.4
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 PICKUP condition. The design of Two step undervoltage protection
UV2PTUV (27) is schematically shown in
.
1MRK 511 408-UUS A
Section 9
Voltage protection
Phasor measurement unit RES670 2.2 ANSI
283
Technical manual
Summary of Contents for Relion RES670
Page 1: ...RELION 670 SERIES Phasor measurement unit RES670 Version 2 2 ANSI Technical manual ...
Page 2: ......
Page 276: ...270 ...
Page 306: ...300 ...
Page 360: ...354 ...
Page 406: ...400 ...
Page 614: ...608 ...
Page 732: ...726 ...
Page 748: ...742 ...
Page 884: ...878 ...
Page 932: ...926 ...
Page 933: ...927 ...