Partial discharge ultrasonic sensor with built-in integral derivative conditioning circuit

Abstract

The application discloses a partial discharge ultrasonic sensor with built-in integral differential conditioning circuit, comprising: a shell, a ceramic ultrasonic receiving surface, a piezoelectric film, an analog-digital conversion conditioning circuit based on integral differential principle, the ceramic ultrasonic receiving surface is the bottom of the shell, and the piezoelectric film and the conditioning circuit are arranged in the shell; the ceramic ultrasonic receiving surface is used for receiving ultrasonic signals generated by partial discharge; the piezoelectric film and the ceramic ultrasonic receiving surface are closely attached, induct ultrasonic signals, and convert the ultrasonic signals into analog voltage signals; the conditioning circuit is used for receiving the analog voltage signals, and converts the analog voltage signals into digital voltage signals which are discrete in time domain and amplified in amplitude after coding. Through implementation of the application, the analog voltage signal data is digitalized by using the conditioning circuit without MCU, and the defect that the traditional ultrasonic sensor directly transmits analog signals and is easily affected by strong electromagnetic noise and interference in a transformer substation is effectively avoided. The structures are integrated in the shell, and the overall volume is reduced.

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