Detection of Weak Signal Amplitude of Winding Deformation Based on Duffing Oscillator

In order to solve the problem that it is difficult to detect the weak sinusoidal response signal when the frequency response method is used to detect the transformer winding deformation fault online, this paper proposes a method to detect the amplitude of the response signal by using Duffing oscillator. Secondly, in order to solve the influence of the target signal phase shift on the amplitude detection in the actual detection process, a method of first detecting the signal phase using a vibrator array composed of Duffing vibrators and then detecting the amplitude is proposed. Finally, using this method to process the two sets of measured response signals of online detection, the detection results show that the maximum error between the detected signal amplitude and the standard signal is 5. 69%, which meets the requirements of the power industry standard, which proves that the method used in this article is It is feasible in winding deformation detection.

1 Introduction

As one of the main equipment of high-voltage substation, transformer is an important part of power system. Its health status is very important to ensure the safe and reliable operation of power grid. Research shows that winding deformation is one of the most common faults of transformer, so it is of great significance to detect winding deformation of transformer.