CIRCUIT PROTECTION DEVICE AND TEST FACILITY TO SIMULATE A FAULT CONDITION

摘要

Residual current device which includes a test facility to simulate a fault condition to ensure reliable operation of the device. A test signal generating means, which is connectable to the input of a sense coil wound on a current transformer and responsive to any current imbalance in the electrical supply, injects at least one test signal representative of a current imbalance directly into the sense coil, which is detectable by a processing means. The current obtained from the output of the sense coil is then compared to a predetermined fault condition.