220 kV向塘线路可听噪声的特性分析

摘要

In order to learn the corona audible noise characters of 220 kV Xiang-Tang transmission line and its influence on nearby residents’life, the corona discharge UV-light, the environmental noise and sound energy of the transmission line were measured. The results show that the corona discharge is mainly concentrated on the wire. The audible noise sound level on the roofs is 46.2 dB(A) at night, which is slightly beyond the limit value 45 dB(A) of the first kind zone in the“sound environment quality national standard”. However, at night, the transmission line audible noise like“s-”was obvious to disturb the nearby residents seriously. Results of the sound energy analysis show that the transmission line audible noise energy mainly focuses in the frequency range below 200 Hz. The sound intensity directivity test shows that the sound energy in the direction from the transmission line to the top floor residents was the highest at 100 Hz frequency. It is the reason that the transmission line noise is slightly beyond the limit but the feeling is so strong.%为了解220 kV向塘输电线路电晕可听噪声特性及其对居民生活的影响，对输电线路开展现场测试并进行电晕放电紫外光、环境噪声和声能量分析。研究结果表明：电晕放电主要集中在线路上。楼顶夜间测试可听噪声为46.2 dB(A)，虽然只是稍稍超过《声环境质量标准》中1类区域的45 dB(A)限值，但现场有明显的输电线路“咝咝”噪声，扰民严重。研究从声能量角度分析发现，夜间输电线路可听噪声能量主要集中在200 Hz以下的低频部分，通过住户方向的指向性声强测试发现，输电线路正对顶楼住户方向所传出来的声能量在100 Hz频率处最大，从而解释了夜间输电线路轻微超标但特有噪声感觉明显的现象。