Areva MiCOM P921 - Page 169

Technical Guide P92x/EN FT/E11
User Guide
MiCOM P921-P922-P923 Page 91/110
- Additional alarms for the MiCOM P922 and MiCOM P923 relay :
Alarm Significance
F1 1
st
frequency stage : instantaneous information
tF1 1
st
frequency stage : time-delayed information
F2 2
nd
frequency stage : instantaneous information
tF2 2
nd
frequency stage : time-delayed information
F3 3
rd
frequency stage : instantaneous information
tF3 3
rd
frequency stage : time-delayed information
F4 4
th
frequency stage : instantaneous information
tF4 4
th
frequency stage : time-delayed information
F5 5
th
frequency stage : instantaneous information
tF5 5
th
frequency stage : time-delayed information
F6 6
th
frequency stage : instantaneous information
tF6 6
th
frequency stage : time-delayed information
V2> 1
st
stage : instantaneous negative sequence overvoltage information
tV2> 1
st
stage : time-delayed negative sequence overvoltage information
V2>> 2
nd
stage : instantaneous negative sequence overvoltage information
tV2>> 2
nd
stage : time-delayed negative sequence overvoltage information
V1< 1
st
stage : instantaneous positive sequence undervoltage information
tV1< 1
st
stage : time-delayed positive sequence undervoltage information
V1<<
2
nd
stage : instantaneous positive sequence undervoltage
information
tV1<< 2
nd
stage : time-delayed positive sequence undervoltage information
F OUT OF
RANGE
Network frequency is out of the operation range (40Hz – 70Hz)
OPERATE TIME
CB
Opening time of the CB is greater than the specified threshold.
CB OPEN NB
The number of CB operations has reached the maximum allowed
number.
CB CLOSE
FAILURE
Closing time of the CB is greater than the specified threshold.