P92x/EN FT/E11 Technical Guide
User Guide
Page 90/110 MiCOM P921-P922-P923
The list of all electrical alarms and their significance are indicated in the table below :
- MiCOM P921, MiCOM P922 and MiCOM P923 : common alarms
Alarms Significance
V> 1
st
stage instantaneous overvoltage information
tV> 1
st
stage time-delayed overvoltage information
V>> 2
nd
stage instantaneous overvoltage information
tV>> 2
nd
stage time-delayed overvoltage information
V>>> 3
rd
stage instantaneous overvoltage information
tV>>> 3
rd
stage time-delayed overvoltage information
V< 1
st
stage instantaneous undervoltage information
tV< 1
st
stage time-delayed undervoltage information
V<< 2
nd
stage instantaneous undervoltage information
tV<< 2
nd
stage time-delayed undervoltage information
V<<< 3
rd
stage instantaneous undervoltage information
tV<<< 3
rd
stage time-delayed undervoltage information
V0> 1
st
stage instantaneous residual overvoltage information
tV0> 1
st
stage time-delayed residual overvoltage information
V0>> 2
nd
stage instantaneous residual overvoltage information
tV0>> 2
nd
stage time-delayed residual overvoltage information
V0>>> 3
rd
stage instantaneous residual overvoltage information
tV0>>> 3
rd
stage time-delayed residual overvoltage information
t AUX 1 time-delayed “tAUX1” information
t AUX 2 time-delayed “tAUX2” information
EQUATION A time-delayed result of the “A” logic equation
EQUATION B time-delayed result of the “B” logic equation
CB FAILURE
“CB Failure” information generated after the energisation of the
logic input allocated to the “CB FAIL” information (see “INPUTS”
sub-menu in the “AUTOMAT.CTRL” menu).
LATCH RELAY
information generated after the activation of the element which is
associated to the latch.
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