Input output module PM863K01 3BSE088381R1

Input output module PM863K01 3BSE088381R1

Input output module PM863K01 3BSE088381R1

Application

Low active power and power factor protection (LAPPGAPC) is one of the local criteria to be checked in direct transfer trip (DTT) scheme. In LAPPGAPC, active power and power factor are calculated from the voltage and current values at this end. On detection of low active power or low power factor condition, the trip output will be set. All the calculation and comparison are done per phase.

If there is a fault and the remote end circuit breaker is tripped, a carrier signal is sent to the local end and the active power in respective phases will decrease. Hence, detection of low active power in at least one of the phases would be one of the factors to ascertain the fault at other end.

The function has two modes, ‘1 out of 3’ and ‘2 out of 3’. ‘1 out of 3’ mode ensures that there is low active power in at least one of the three phases, while the ‘2 out of 3’ mode the low power is ensured in at least two phases simultaneously before sending the trip signal.

Line which is tripped at the remote end will have low active power flowing through it which also results in low power factor in the respective phase. A low power factor criterion could also be an added check of the local criterion in DTT.

In this function phase wise power factor is calculated, and a comparison is made for the low power factor condition to give phase segregated start and trip.