一种可用于电缆局部放电检测的串联谐振系统

A Frequency-tuned Resonant System for PD Measurement and Withstand Test

交联聚乙烯电缆正日益取代传统的架空线路,逐渐成为城市输配电网络的重要构成部分。复杂的电力电缆网络对电缆的故障检测技术提出了更高的要求,然而传统的串联谐振系统存在大量的脉冲干扰,导致其只能进行耐压试验而不能用于局部放电检测,难以满足电缆绝缘状态评估的需要。为了实现对电缆绝缘状态全面且可靠的评估,文中提出了一种改进的串联谐振系统,利用等脉宽调制技术和时域开窗技术滤除脉冲干扰,实现了在开展电缆耐压试验同时进行局部放电检测的功能,并用实验室试验验证了系统的有效性。

XLPE cables have become an important part of urban transmission and distribution networks in recent years. As cable systems become more complex, simple withstand voltage test can not meet the needs of cable fault detection. However, the traditional frequency-tuned resonant system has a large amount of pulse interference, which makes it impossible to use for partial diseharge（PD） measurement. It introduces an improved frequency-tuned resonant system, using pulse width modulation and time domain elimination to achieve PD measurement and withstand test at the same time. The effectiveness of the system is verified by experiments.