How do I model a low voltage (LV) circuit breaker (ACB, MCCB or MCB) relay (release)?
The modelling of LV circuit breaker releases is very similar to the modelling of HV circuit breaker relays with some slight differences. These differences are briefly highlighted below.
The modelling of LV circuit breaker releases is very similar to the modelling of HV circuit breaker relays. The main difference is that although a CT element is selected (StaCt), this element should not be specified to have a type (TypCt) or alternatively the CT type should have a ratio of 1:1. If no CT type is selected, PowerFactory by default assigns a 1:1 ratio to the CT. The uninterrupted current rating of the LV circuit breaker is assigned in the relevant measurement block of the relay as the Nominal Current rating of the relay. By modelling the relays in this way a single relay type can be used to represent numerous physical instances of a relay model.
Please refer to the relay modelling advanced tutorial for more detailed information regarding modelling of LV circuit breakers.