电力变压器局部放电在线监测干扰分析与抑制

IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1997-10-19 DOI:10.1109/CEIDP.1997.641128

Changchang Wang, X. Jin, T. Cheng, Shibo Zhang, Z. Dong, Zhongdong Wang, D. Lin, Deheng Zhu

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引用次数: 1

摘要

电力变压器局部放电在线监测的关键是如何有效地抑制干扰。本文报道了利用快速傅立叶变换(FFT)技术对现场干扰进行定性和定量分析。在电力系统的载波通信、晶闸管开关、高频保护信号以及无线电广播信号中发现了各种周期性干扰。采用LMS自适应数字滤波器和FFT阈值数字滤波器可以消除连续周期性噪声，实现PD在线监测。然而，它们也有自身的内在弱点。为此，研制了一种基于FFT的多带通数字滤波器。这是一种较好的抑制连续周期性干扰的方法。

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Analysis and suppression of interference for on-line monitoring of partial discharge of power transformers

The key to on-line partial discharge (PD) monitoring of power transformers is how to suppress interference effectively. This paper reports an interference qualitative and quantitative analysis on site using a Fast Fourier Transform (FFT) technique. Various periodic interferences have been found, which emanated from the carrier communication, thyristor switching, and high frequency protection signals of the power system as well as radio broadcasting signals. LMS adaptive digital filters and FFT threshold digital filters can be used to eliminate continuous periodic noises for on-line PD monitoring. However, they suffer from their own intrinsic weaknesses. Therefore, a multi-band-pass digital filter based on FFT has been developed. It is an much better method for suppressing continuous periodic interferences.

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来源期刊

IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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