Patent ID: 7626791
Filing Date: 2009-12-01
Classification: B63H,H02H

Abstract:
1. An electrical fault protection arrangement including a busbar, at least one source of direct electrical current connected to the busbar, at least one electrical load circuit connected to the busbar, a plurality of sensors to obtain electrical current values, the sensors being arranged to obtain electrical current values for all electrical currents entering the busbar and all electrical currents leaving the busbar, a controller coupled to the sensors to receive all of the electrical current values, the controller is arranged to sum all the electrical current values from all the sensors to produce a summation value, the controller is arranged to compare the summation value with a threshold value stored in the controller for a first time duration, to provide a control signal for controlling an isolation device to electrically isolate the busbar, said controller being arranged to compare electrical current values for the at least one electrical load circuit with an expected value stored in the controller for a second time duration to provide a control signal for controlling an isolation device to electrically isolate the at least one electrical load circuit wherein said second time duration is greater than said first time duration.