The circuit breaker protection can be selected from the list and added to the breaker unit.
To select a circuit breaker the user has to click on “Select Breaker” button. Then a circuit breaker model selection windo will pop up.
In this window the user should expand one of the manufacturers (ABB, Siemens, Schneider…), then expand one of breaker models and select appropriate tripping unit and press “OK”. The circuit breaker will be added and its curve will be shown in the right side of the configuration window.
In the configuration window the user can modify circuit breaker title, define nominal circuit breaker current, define overload protection values (IR value and tR time value), short circuit protection values (Isd value and tsd time value), instantaneous short circuit protection value (Ii value) and ground fault protection value (Ig current value tg time value). Protection number and number of properties depend on manufacturer and circuit breaker tripping unit. Every property value arrays are taken from official public manufacturer documentation.
On the right, in the configuration window, the user can instantly preview curve changes. To make configuration more easily there are several markers in the chart:
I_N in red – this is the nominal current of an element or current from power flows.
I_Motor_start in green – current flowing through element during motor starting.
I_max in yellow – current calculated based on I_N and coefficients “Ka” (reserve coefficient), “Kp” (transitional process coefficient), “Kg” (protection return coefficient). Coefficients are configured in the main configuration window. I_max value is calculated based on Eq. (2).
