Areva MiCOM P921 - Page 372

P92x/EN RS/E11 Technical Guide
Test Report
Page 20/22 MiCOM P921-P922-P923
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7.7 “Under/overfrequency protection” function (P922-P923)
Settings
[81] FREQUENCY
Default values
Group 1 Group 2
1
st
stage activated No No / 81< / 81> * No / 81< / 81> *
1
st
frequency stage 50 Hz Hz Hz
1
st
stage time delay 0.04s Secs Secs
2
nd
stage activated No No / 81< / 81> * No / 81< / 81> *
2
nd
frequency stage 50 Hz Hz Hz
2
nd
stage time delay 0.04s Secs Secs
3
rd
stage activated No No / 81< / 81> * No / 81< / 81> *
3
rd
frequency stage 50 Hz Hz Hz
3
rd
stage time delay 0.04s Secs Secs
4
th
stage activated No No / 81< / 81> * No / 81< / 81> *
4
th
frequency stage 50 Hz Hz Hz
4
th
stage time delay 0.04s Secs Secs
5
th
stage activated No No / 81< / 81> * No / 81< / 81> *
5
th
frequency stage 50 Hz Hz Hz
5
th
stage time delay 0.04s Secs Secs
6
th
stage activated No No / 81< / 81> * No / 81< / 81> *
6
th
frequency stage 50 Hz Hz Hz
6
th
stage time delay 0.04s Secs Secs
7.8 “Rate of change of frequency” function (P923)
Default values Settings
[81R] Rate of
change of frequency
Group 1and 2
1
st
stage activated No No/Yes*
1
st
stage df/dt1 1.0 Hzs Hzs
1
st
stage activated No No/Yes*
1
st
stage df/dt2 1.0 Hzs Hzs
1
st
stage activated No No/Yes*
1
st
stage df/dt3 1.0 Hzs Hzs
1
st
stage activated No No/Yes*
1
st
stage df/dt4 1.0 Hzs Hzs
1
st
stage activated No No/Yes*
1
st
stage df/dt5 1.0 Hzs Hzs
1
st
stage activated No No/Yes*
1
st
stage df/dt6 1.0 Hzs Hzs