Areva MiCOM P921 - Page 339

Technical Guide P92x/EN CM/E11
Commissioning Guide
MiCOM P921-P922-P923 Page 17/28
abcd
5.3.2 MiCOM P921-P922-P923 relay parameters
Note the settings of the MiCOM P921-P922-P923 relays in the tables below.
Settings
[59] OVERVOLTAGE
Default values
Group 1 Group 2 (P922-P923)
1
st
stage activated No No / AND / OR * No / AND / OR *
1
st
overvoltage stage 130.0V if H1**
480.0V if H2
VV
Time delay type DMT DMT/IDMT * DMT/IDMT *
TMS 1.0
tRESET V> 0.01s Secs Secs
tV>= 0.04s Secs Secs
2
nd
stage activated No No / AND / OR * No / AND / OR *
2
nd
overvoltage stage 130.0V if H1**
480.0V if H2
VV
tV>>= 0.01s Secs Secs
3
rd
stage activated No No / AND / OR * No / AND / OR *
3
rd
overvoltage stage 130.0V if H1**
480.0V if H2
VV
tV>>>= 0.01s Secs Secs
Hysteresis 0.98
Settings
[27] UNDERVOLTAGE
Default values
Group 1 Group 2 (P922-P923)
1
st
stage activated No No / AND / OR * No / AND / OR *
1
st
undervoltage stage 5.00V if H1**
20.0V if H2
VV
Time delay type DMT DMT/IDMT * DMT/IDMT *
TMS 1.0
tRESET V< 0.01s Secs Secs
tV<= 0.04s Secs Secs
2
nd
stage activated No No / AND / OR * No / AND / OR *
2
nd
undervoltage stage 5.00V if H1**
20.0V if H2
VV
tV<<= 0.01s Secs Secs
3
rd
stage activated No No / AND / OR * No / AND / OR *
3
rd
undervoltage stage 5.00V if H1**
20.0V if H2
VV
tV<<<= 0.01s Secs Secs
Hysteresis 1.02
* Delete as appropriate
** H1 = 57-130V voltage range H1 = 220-480V voltage range