Complex wavelet transform partial discharge location test method and device

Abstract

The invention provides a complex wavelet transform partial discharge location test method and device. The method includes the steps of: simulating a partial discharge signal of a transformer substation by exponential damped oscillation pulse, and adding various noise signals of the noise jamming simulation transformer substation based on the partial discharge signal; filtering the signal added with the noise by complex wavelet transform, and thereby obtaining the denoised signal; working out the arrival time delay between two signals by a high-order cumulant detection method; at last estimating the partial discharge location by detecting the arrival time delay between the signals of the sensor. According to the complex wavelet transform partial discharge location test method and device. The interference of the Gaussian noise on the original partial discharge signal; the complex wavelet transform has good applicability for denoising the partial signal, can restore the amplitude, the phase and other characteristics of the partial signal, provides the partial signal with high quality for time delay estimation, and can improve the accuracy of the time delay estimation based on high-order cumulants.

Description

Technical field [0001] The invention relates to the technical field of power high voltage and insulation, in particular to a partial discharge positioning test method and device for complex wavelet transform. Background technique [0002] Partial discharge of power equipment is one of the causes of equipment aging, deterioration and even damage. In severe cases, it can cause accidents in substations and power systems. Therefore, it is extremely important to correctly evaluate the insulation status of power equipment, and partial discharge detection is one of the important means to evaluate the insulation status of power equipment. The previous partial discharge monitoring method in the substation is to detect the partial discharge signal of a single device. To realize the partial discharge detection of all power equipment in the station, a large number of sensors are required, which will greatly increase the investment cost. [0003] The partial discharge signal detection methods ...

AI Technical Summary

Problems solved by technology

The time delay estimation method has a clear idea and a strong theoretical basis, but the method has high requirements on the signal, and requires that the noise signal and the partial discharge signal are not correlated with each other.

In reality, the noise signal in the substation is very complex, including Gaussian noise, communication narrowband noise, etc. Therefore, how to reduce or eliminate the influence of these noises is the key to the time delay estimation method. At present, there are no reports and literature on related methods at home and abroad.

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