1000kV特高压交流变电站噪声特性及变化规律

Characteristic and Variation of Noise at 1000kV UHV Substation

以1000kV特高压交流变电站为研究对象,连续3年在工况基本相同条件下对同一变压器、高压电抗器以及场界噪声进行了测量统计,分析了变电站主要设备噪声的分布情况,变化规律与衰减特性。结果表明,连续3年主变压器平均噪声分别为72.9.73.4、74.6 dB(A),平均每年递增0.6 dB(A),通过频谱分析得出主变噪声逐年增加主要由于冷却风扇噪声增加所致。连续3年高压电抗器室内平均噪声分别为77.0、.77.8、79.1 dB(A),平均每年分别递增0.7 dB(A),室外平均噪声分别为65.7、66.7、66.8 dB(A),平均每年分别递增0.4 dB(A),室内外平均噪声相差9.5~14.1 dB(A)。连续3年变电站场界噪声变化规律相近,且站界噪声值较小,变电站内主要设备发出的噪声对周边环境影响甚微。

In this paper,the 1000 kV UHV AC substation is taken as an example,the measurement and statistics on the noise of same transformer,HV reactor and filed boundary are performed under the basically identical condition in the consecutive three years.The noise distribution,variation and attenuation feature of the main equipment in the substation are analyzed.The results show that the average noise of main transformer for three consecutive years is 72.9,73.4 and 74.6 dB(A)respectively,with an average increase of 0.6 dB(A)per year.It is concluded through spectrum analysis that the increase of the noise of the main transformer year by year is mainly due to the increase of the noise of the cooling fan.The average noise of the high voltage reactor in the consecutive years is 77.0,77.8 and 79.1 dB(A)respectively,with an average increase of 0.7 dB(A)per year,the average outdoor noise level is 65.7,66.7 and 66.8 dB(A)respectively,with an average increase of 0.4 dB(A)per year and the difference between average indoor and outdoor noise is 9.5〜14.1 dB(A).For three consecutive years,the noise variation of substation field boundary is similar and the noise value in the station boundary is small.The noise from the main equipment in the substation has little impact on the surrounding environment.