CAJ | 학술논문

为研究两点电晕放电产生的可听噪声的特性,该文在 10m法电波暗室内搭建了正极性两点电晕放电测试平台,准确测量了两个放电点相距12 mm、10 cm、20 cm、40 cm、60 cm及80 cm时正极性电晕放电产生的可听噪声与电晕电流的时域波形.借助于电晕电流与可听噪声脉冲的一一对应关系,提出从时域分离两点电晕放电时各放电点产生的可听噪声时域波形方法,借助于分离出的可听噪声时域波形对两点电晕放电产生可听噪声的关联特性进行了分析.实验结果表明:两点电晕放电产生的可听噪声脉冲与电晕电流脉冲依然具有一一对应关系.在时域上两点电晕放电产生的声压为各放电点产生的声压的线性叠加,在计算两点电晕放电产生的总声压级特性时,可以按照声功率叠加的方法来计算.实际输电线路上放电点的间距一般较大,各放电点可以看成不相关的声源,放电产生的声压及声功率均可采用线性叠加的方法来计算.在分析放电点间距对可听噪声的特性的影响时,需要综合考虑放电点之间的相互影响及放电点产生的声波衰减的影响.
위연구량점전훈방전산생적가은조성적특성,해문재 10m법전파암실내탑건료정겁성량점전훈방전측시평태,준학측량료량개방전점상거12 mm、10 cm、20 cm、40 cm、60 cm급80 cm시정겁성전훈방전산생적가은조성여전훈전류적시역파형.차조우전훈전류여가은조성맥충적일일대응관계,제출종시역분리량점전훈방전시각방전점산생적가은조성시역파형방법,차조우분리출적가은조성시역파형대량점전훈방전산생가은조성적관련특성진행료분석.실험결과표명:량점전훈방전산생적가은조성맥충여전훈전류맥충의연구유일일대응관계.재시역상량점전훈방전산생적성압위각방전점산생적성압적선성첩가,재계산량점전훈방전산생적총성압급특성시,가이안조성공솔첩가적방법래계산.실제수전선로상방전점적간거일반교대,각방전점가이간성불상관적성원,방전산생적성압급성공솔균가채용선성첩가적방법래계산.재분석방전점간거대가은조성적특성적영향시,수요종합고필방전점지간적상호영향급방전점산생적성파쇠감적영향.
In order to investigate the characteristics of the audible noise from a pair of positive corona sources on the conductor, a platform with two corona sources was set up in the 10 m anechoic chamber. The time-domain waveforms of audible noise and corona current were accurately measured. In the experiments, the distances of the two corona sources were set as 12 mm, 10 cm, 20 cm, 40 cm, 60 cm and 80 cm respectively. A method for separating the sound pressure pulses from two corona sources was developed with the help of the one-to-one relationship between the audible noise and the corona current. Based on the separated audible noise waveform, the correlation of audible noise from two corona source was presented. The results show that the audible noise pulse and the corona current pulse for two corona sources still have one-to-one relationship in time-domain. The sound pressure generated by the two corona sources can be treated as the superposition of the sound pressure generated by each source. The distance of the corona sources for the practical transmission lines is generally large enough, and thus the corona sources can be treated as uncorrelated sound sources. This paper gives a confirmation that the analysis of the sound pressure level from two corona sources can be carried out in terms of acoustics power on the basis of the results. Besides, the interactions from corona sources and the attenuation of the audible noise should be taken into consideration in the analysis of the influence of the separations between corona sources on the total sound pressure level.