电缆终端和接头现场精确局部放电测量方法

Toshihiro Takahashi
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引用次数: 2

摘要

局部放电测量是电力设备绝缘诊断和精确资产管理的重要技术手段。然而,PD有时不是连续发生的,而是在其初始阶段以非常低的重复率发生。这种情况下,由于重复率极低的脉冲难以产生相位分辨PD模式(PRPD模式)等指纹,给现场PD测量和诊断带来了困难。相反,在现场PD测量中获得的连续产生的脉冲信号有时不是来自于在内部电绝缘层产生的PD,而是来自于设备外部,如套管的表面、安装在客观设备附近的设备的金属部件的边缘。这些不是来自预期仪器的信号有时会导致错误的诊断结果。因此,PD信号的鉴别方法对于PD的准确测量和诊断具有重要意义。本文讨论了电缆端部和接头局部电流测量的判别方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Methodology of on-site Precise Partial Discharge Measurement for Cable Terminations and Joints
Partial discharge (PD) measurement is a powerful technique for the insulation diagnosis and precise asset management of electric power apparatus. However, PD occurs sometimes not continuously, rather with very low repetition rate in its inception stage. In that case, it is difficult in on-site PD measurement and diagnosis, because the pulses of very low repetition rate are difficult to produce any finger print such as phase resolved PD pattern (PRPD pattern). On the contrary, the continuously generated pulse signals obtained at the on-site PD measurement sometimes do not come from PD generated at the internal electrical insulation layer but outside of the apparatus such as a surface of the bushing, an edge of a metallic part of the apparatus which is installed near the objective apparatus. These signals coming not from the intended apparatus sometimes leads incorrect diagnostic results. Thus, the discrimination methodology of PD signals occurring in the intended apparatus is important for the accurate PD measurement and diagnosis. This paper discusses the discrimination methodology for the PD measurement at cable terminations and joints.
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