Research On Prediction And Control Technology Of Noise Pollution In High Voltage Substation

110 kV,220 kV,330 kV and 500 kV substation built in the surrounding area of a city Originally,in the process of urbanization gradually adjacent area near the center of the city public places and residential areas.Research on noise prediction and control technology of high voltage substation, solve the problem of noise nuisance has very important practical significance.This research on the basis of the existing work at home and abroad, using BSWA308 sound level meter and the BSWA VS302USB spectrometer field tested the status of noise pollution in guangzhou 7 transformer substations and zhuhai 9 transformer substations of different voltage grade.The results showed that part of the substations which adjacent living area lack of noise prevention and control measures, the value of noise more than the standard where the living area need to observe, exists the phenomenon of noise nuisance.Through measure we found that the main noise source of the transformer substation is the transformer, the second is the reactor and the switch devices. The noise of transformer are divided into ontology noise and cooling device noise, the frequency of ontology noise is always below 500 Hz,the frequency of cooling device noise is 1 kHz to 3 kHz, and the frequency of reactor noise is about 20 Hz to 1 kHz.How strong the source of noise in substation transformer is affected by the factors of transformer have blast walls and radiator or not and so on, in addition, the high frequency of the substation noise attenuation fast under the obstacles blocking, low frequency attenuation slowly, therefore, the low frequency noise become the key object in the noise control.We obtain the revised law of high voltage substations noise prediction model throuth comparing the prediction results and the actual test results of noise in different high voltage substation:Substation noise is mainly affected by the geometric divergence attenuation,the obstructions attenuation,the air absorption attenuation and the ground excess attenuation, When to attenuation calculate, because of the influence of actual structure in substation is different to the calculation principle which existing, the calculated values of geometric divergence attenuation and obstructions attenuation need to be corrected respectively,the values of correction coefficient were 0.7 and 0.5, compared the calculation results from the modified model of noise prediction with actual noise measurements at prediction point are consistent basically.By comparing the present situation of noise pollution in different voltage grade substation, it is concluded that the prevention measures of high voltage noise in substations mainly through two methods is noice source control and transmission control, of which the former is the most fundamental and most effective control measures, but it often can not meet the noise reduction demand and need the latter to further control. According to the transmission of noise is infected by many factors such as geometric divergence attenuation, obstructions attenuation,air absorption attenuation,additional attenuation, making noise control planning before built substation to make full use of the existing geographic environment and planning station building location reasonably according to the above factors, realize "self-marketing" of substation noise; In the existing substation, noise control through the sound barrier,paste the sound-absorbing material,planting green belts and so on, make the substation noice reached noise limit of the national standard ultimately.