HVDC单极运行对500kV交流变压器的振动影响分析研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (17) : 201-206.

论文

丁登伟, 张星海, 兰新生

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Effect Investigation of Vibration on 500kV AC Transformer Caused by HVDC System under Monopole Operation

Ding Deng-wei, Zhang Xin-hai and Lan xin-sheng

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摘要

当特高压直流系统单极大地回路运行时，直流电流将经中性点接地线流入接地极附近的变压器，使得变压器振动加强。在宾金特高压直流系统调试时，研究人员采用振动测试系统检测了宜宾接地极附近的泸州站500kV变压器振动信号。本文利用小波时频变换，分析变压器振动信号的频谱分布特征，提取了变压器振动声学指纹和三个典型特征参数，包括频谱能量分布百分比、奇偶谐波能量比和波形畸变比。当直流系统的电流从0A增至5000A时，通过分析泸州站500kV变压器的振动声学指纹和三个典型特征参数的变化，研究直流偏磁对500kV变压器运行状态的影响。测试分析发现变压器振动信号的奇偶谐波能量比随电流增大而明显变小，此外频谱能量分布百分比和振动声学指纹也变化显著，有利于准确评估直流偏磁对变压器的运行影响。

Abstract

When the HVDC system works in monopole ground return mode, dc current flows through the neutral of ac power transformer with the neutral grounded, which will enhance its vibration . In the debugging of the Yibin-Jinhua high voltage direct current (HVDC) system, the vibration testing system was applied by the researchers to detect the vibration signal of the 500kV transformer in the Luzhou substation, which is nearby the grounding substation. The spectrum distribution of the transformer vibration signal is analyzed by means of the wavelet transform, the vibration acoustic fingerprint and three typical characteristic parameters including the distribution percentage of spectral energy、the energy radio of odd and even harmonic and the waveform distortion radio, are extracted respectively. When the current of HVDC system increased from 0A to 5000A, the impact of the DC bias on the operation status of 500kV transformer was investigated through the change analysis of the vibration acoustic fingerprint and three characteristic parameters. It indicated that the energy radio of odd and even harmonic of the 500kV transformer vibration signal induced significantly with the increase of the current. In addition, the distribution percentage of spectral energy and the vibration acoustic fingerprint changed obviously. It is conducive to assess accurately the effect of the DC bias on the operation status of the transformer.

关键词

特高压直流 / 直流偏磁 / 变压器振动 / 小波时频变换 / 振动声学指纹。

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丁登伟, 张星海, 兰新生. HVDC单极运行对500kV交流变压器的振动影响分析研究[J]. 振动与冲击, 2016, 35(17): 201-206

Ding Deng-wei, Zhang Xin-hai and Lan xin-sheng . Effect Investigation of Vibration on 500kV AC Transformer Caused by HVDC System under Monopole Operation[J]. Journal of Vibration and Shock, 2016, 35(17): 201-206

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