Abstract
In order to analyze the partial discharge (PD) characteristics of a liquid/solid composite medium in an oil-filled submarine cable terminal; we have designed five discharge models including needle-plate, plate-to-plate air gap, surface, slide-flash and suspension potential. At the same time, the ultrasonic signals of PD have been extracted through the typical fault model research platform of oil-filled submarine cable equipment. First, we use SureShrink threshold wavelet denoising to suppress the ultrasonic signal noise. Secondly, through the multi-scale analysis of the signal, the energy distribution maps of five different types of PD are obtained; the analysis found that needle-plate discharge, suspension discharge, and slide-flash discharge have better resolution; and plate-to-plate air gap discharge and creeping discharge have similar characteristics and are not easy to distinguish. Finally, we designed six characteristic parameters of the ultrasound signal, and screened three feature quantities by a back propagation (BP) neural network to distinguish between plate-to-plate air gap discharge and surface discharge. In summary, the method of combining multi-scale analysis and neural networks is used to distinguish the five discharge types by extracting the characteristic values of the characteristic signals.
Highlights
The high-voltage cable terminal is an indispensable accessory for connecting other electrical equipment when laying high-voltage cables
For partial discharge (PD) ultrasonic signals, such as smallfast-fading signals, we use wavelet transform to extract the characteristics of the signals is a very ultrasonic signal, the ultrasonic signal is a non-linear signal
For PD ultrasonic signals, such as smallamplitude, fast-fading signals, we use wavelet transform to extract the characteristics of the signals effective method
Summary
The high-voltage cable terminal is an indispensable accessory for connecting other electrical equipment when laying high-voltage cables. The main structure of the oil-filled terminal is to install a stress cone at the end of the cable insulation shield to improve the electric field distribution, and install it into a ceramic or composite material sleeve [2]. With the increase of the cable terminal use time, the aging of the insulating oil will gradually increase, leading to a significant reduction in the terminal’s insulation performance, which will cause the cable terminal to heat, discharge, and even cause insulation breakdown failure. Whether it is the cracking of the insulating oil or the decomposition
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