Research on Measurement of Transformer Short-Circuit Force Using Piezoelectric Thin Film Polyvinylidene Fluoride Sensor

Abstract

This paper presents a newly designed piezoelectric thin film polyvinylidene fluoride (PVDF) sensor that is able to measure short-circuit force directly in a short-circuit test. The sensor, with its advantages of high sensitivity, thin shape and shock-resistant, could measure the axial and radial short-circuit force which is usually difficult to measure due to large voltage and small gap between transformer windings during a short-circuit test, and thus provides a good way to study the ability of transformers to withstand short circuit, in which case many transformer accidents are caused. In the first part the working principle of PVDF sensor and the design of PVDF sensor in transformers are described. The following part introduces the calculation and simulation of the sensor and the short-circuit force. A real short-circuit test with PVDF sensor is then recorded and analyzed in the following part. And it is finally concluded that the piezoelectric thin film PVDF sensor is proved to have high accuracy in the measurement of the short-circuit force of transformer.