HVDC单极运行对500kV交流变压器的振动影响分析研究  

Effects of HVDC monopole operation on vibration of a 500 kV AC transformer

作　　者：丁登伟[1] 张星海[1] 兰新生[1] 

机构地区：[1]国网四川省电力公司电力科学研究院,成都610072

出　　处：《振动与冲击》2016年第17期201-206,共6页Journal of Vibration and Shock

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500 kV变压器振动信号。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0 A增至5 000 A时,通过分析泸州站500 kV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500 kV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。When a HVDC system works with a monopole ground return mode,DC current flows into an AC power transformer near the grounded neutral,pole through the ransformer＇s neutral ground wire vibration. In debugging YibinJinhua high voltage direct current（ HVDC） system,a vibration testing system was applied to detect vibration signals of a 500 kV AC transformer of Luzhou substation near Yibin grounded pole. The spectral distribution features for the transformer＇s vibration signals were analyzed by means of the wavelet transformation,the vibration acoustic fingerprint and three typical characteristic parameters including the percentage of spectral energy distribution,the energy radio of odd and even harmonics and the waveform distortion radio were extracted,respectively. When the current of the HVDC system increased from 0 A to 5 000 A,the effects of DC bias on the operation status of the 500 kV AC transformer were investigated through analyzing the variation of the vibration acoustic fingerprint and three characteristic parameters of the transformer. The results showed that the energy radio of odd and even harmonics of the transformer vibration signals decreases significantly with increase in DC current; in addition,the percentage of spectral energy distribution and the vibration acoustic fingerprint vary obviously; these results are beneficial to evalute correctly the effects of DC bias on the operation 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 

分 类 号：TE855[石油与天然气工程—油气储运工程]