Patent ID: 7180303
Filing Date: 2007-02-20
Classification: H01H

Abstract:
1. A simple discharge detector for a power equipment using an acoustic emission technique, comprising: an acoustic emission sensor set on power equipment to sense acoustic emission signals generated from said power equipment; a preamplifier connected to an output of said acoustic emission sensor to amplify said acoustic emission signals; a bandpass filter connected to said preamplifier to filter off acoustic emission signals having high and low frequencies; a comparator having a first input connected to an output of said bandpass filter to receive said filtered acoustic emission signals therefrom and a second input coupled to a reference voltage, said comparator having an output providing square-wave signals corresponding to said filtered acoustic emission signals having a magnitude greater than said reference voltage; a microprocessor having an input coupled to said output of said comparator and an output coupled to a numeric display, said microprocessor including a counter for counting a number of said square-wave signals received per second and said microprocessor outputting said count said numeric display for displaying partial discharge occurrences per second, said microprocessor illuminating an indicator responsive to said microprocessor detecting receipt of periodic acoustic emission signals.