Arc detection using detailed and approximate coefficients of discrete wavelet transform

摘要

An apparatus for facilitating interruption of current in an electrical circuit is provided and includes a current sensing device (10) in the electrical circuit to service an electrical load, the current sensing device (10) being productive of an output signal representative of a load current passing therethrough, a detection unit (30), in signal communication with the current sensing device (10) such that the output signal is received by the detection unit (30), the detection unit (30) being configured and disposed to output a secondary signal based on the output signal, and a microcontroller (80) to receive and to decompose the secondary signal into detailed and approximate coefficients, and to generate a trip signal for use in interrupting an operation of the electrical circuit when a current of the sensed load is above a predetermined threshold and the detailed and approximate coefficients cooperatively indicate that threshold conditions for trip signal generation are satisfied.