特高压交流同塔双回输电线路可听噪声长期测试数据分析

Analysis of Long-term Measured Data of Audible Noise on UHV AC Double-circuit Transmission Lines on the Same Tower

为获取实际运行的特高压交流同塔双回输电线路可听噪声水平及其特性,并对BPA公式修正方法进行评估,通过在1 000 kV淮南—上海特高压同塔双回输电线路沿线的安徽芜湖建立一处电磁环境长期观测站,对可听噪声开展了10个月的长期测试,获取了不同天气下的可听噪声典型频谱,并对雨天可听噪声测试数据进行了统计分析。研究表明:芜湖观测站3个测点测得的雨天可听噪声基本符合正态分布,边相导线投影外20 m可听噪声A声级与其8 k Hz分量的相关性较好。边相导线投影外10、20 m处的雨天可听噪声实测L50值分别为49.83、49.58 d B,与BPA公式计算值减2 d B修正后的预测结果较相符。

In order to obtain the level and characteristics of audible noise from actual UHV AC double-circuit transmis- sion lines on the same tower in operation, the long-term observation station for electromagnetic environment was established near 1 000 kV Huainan-Shanghai UHV AC double-cimuit transmission lines on the same tower in Wuhu, An- hui Province. Typical spectra under different weather conditions and the of audible noise during rainy days were obtained for ten months. The results show that the data of audible noise during rainy days from the three measure points in Wuhu observation station conform to normal distribution, and the A-weighted level of audible noise and its 8 kHz components at 20 m away from the projection of outside phase have a good correlation. The Lso audible noise level during rainy days at 10 m and 20 m away from the projection of outside phase are 49.83 dB and 49.58 dB, respectively, which are in consistent with the calculation by using BPA method minus 2 dB.