MainsPro, SW version 1.4, ©ComAp – January 2013
MainsPro Reference Guide
Library of relay outputs
The standard logic of MainsPro corresponds to the standard of protective relays and offers an option
to set the logic of the relay outputs. For safety reasons there are available full set of outputs marked
with an exclamation mark “!”, which remain energized in fault-free state and in case of power supply
failure, the unit goes to “fault” indication position - the output relay deactivates. MainsPro also allows
setting the output relays to normal logic, so the outputs maintain de-energized in fault-free state and in
case of a trip, the relays energize.
CommTrpPer
Common trip permanent relay; closes at any failure with delay given by appropriate parameter. Relay
is in fault-free state kept in open position and closes immediately in case of LOM protection (Vector
shift or ROCOF), External trip, incorrect phase rotation or wrong phase polarity. Relay opens in fault
free state after successful fault reset. In case of LOM protection, the delay LOM: LOM Trip Del is
timed out and after this time it is possible to perform Fault reset.
!CommTrpPer
Inverse common trip permanent relay; opens at any failure with delay given by appropriate parameter.
Relay opens immediately in case of LOM protection (Vector shift or ROCOF), External trip, incorrect
phase rotation or wrong phase polarity. Relay closes in fault free state after a successful fault reset. In
case of LOM protection, the delay LOM: LOM Trip Del is timed out and after this time it is possible to
perform Fault reset.
CommTrpImp
Common trip impulse relay; closes at any failure with delay given by appropriate parameter. Relay is
in fault-free state kept in open position and closes immediately in case of LOM protection (Vector shift
or ROCOF), External trip, incorrect phase rotation or wrong phase polarity. Relay opens after Basic:
Imp Len has timed out, his opening however does not mean end of trip state! Trip is terminated in fault
free state after a successful fault reset. In case of LOM protection, the delay LOM: LOM Trip Del is
timed out and after this time it is possible to perform Fault reset. During trip status, the relay does not
react on any new failure.
!CommTrpImp
Inverse common trip impulse relay; opens at any failure with delay given by appropriate parameter.
Relay opens immediately in case of LOM protection (Vector shift or ROCOF), External trip, incorrect
phase rotation or wrong phase polarity. Relay closes after Basic: Imp Len has timed out, his closing
however does not mean end of trip state! Trip is terminated in fault free state after a successful fault
reset. In case of LOM protection, the delay LOM: LOM Trip Del is timed out and after this time it is
possible to perform Fault reset. During trip status, the relay does not react on any new failure.
CommSigImp
Inverse immediate impulse signalling relay; closes immediately at any failure. Relay opens after Basic:
Imp Len since its closing. Any other detected fault-state during run of this timer has no effect. Fault
reset has no influence on this output.
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