特高压交流试验基地电晕噪声抑制

为了抑制特高压交流试验基地1000kV变电区域严重电晕放电及其产生的可听噪声,使试验基地可听噪声满足环境标准的要求,测量了1000kV变电区域的电晕可听噪声并观测了电晕放电的发生情况,得出了部分设备、金具设计不合理和施工存在一定缺陷导致严重电晕的结论。提出了诸如增大均压球直径、整理软母线、更换隔离刀闸导杆等措施以减轻电晕及可听噪声。测量结果显示,部分措施实施后,电晕放电得到了有效控制。局部区域的可听噪声降低了约10dB,验证了所提出的优化措施的有效性。同时指出,可听噪声将随基地运行时间的增加而日趋稳定,应深化对均压环电晕的研究。

Restraint of Corona Noise in UHV AC Test Base

In order to mitigate the serious corona discharges and the noise caused by them in the 1000 kV area in the UHV AC test substation to make the noise of the test base accords with the requirement of the reply of the authority,the paper measures the noise and investigates the corona in the area,and gets the conclusion that the improper design of some equipment,fittings and the disfigurement of construction result in the serious discharge. Many measures,such as to enlarge the diameter of the grading rings/spheres,to arrange the flexible buses,to change the bars of the disconnecting switch,were used to reduce the audible noise. After some of these measures had been taken,the corona discharge was mitigated efficiently and the audible noise was reduced around 10 dB,the validity of the measurements was proved. At the same time,it could be expected that the values of audible noise will be stable day after day,the study on corona of the grading ring should be continued.