新型串联谐振测试系统及其在中压电缆局部放电检测中的应用研究

Study on Novel Series Resonance Test System and Its Application in Partial Discharge Detection of Medium-voltage Power Cables

研制了一种新型串联谐振试验系统,该系统由变频电源、开关模块、励磁变压器、谐振电抗器4部分组成。相比于传统串联谐振试验系统,本系统引入全新的开关模块,解决了应用串联谐振试验系统进行电缆局部放电测试时存在大量开关噪声的问题,该试验系统不仅可进行电缆耐压试验,还可测量电缆局部放电水平。最后在实验室条件下开展电缆局部放电检测及定位分析,进一步验证了本系统进行电缆局部放电测量时的准确性和有效性。

A novel series resonance test system, which consists of variable-frequency power supply, switch module, exciting transformer, and resonant reactor, was designed. Compared with the traditional series resonance test system, this novel system introduced a new switch module to reduce the noise in PD detection of cables. This novel system can conduct not only withstand voltage test but also PD test of cables. Finally, PD detection and positioning analysis were conducted on cables under laboratory condi- tions, which further verified the accuracy and effectiveness of the system.