Simulation analysis of interference sound field of shunt high voltage reactor

Abstract

At present, the company has invested more scientific research work and case projects in noise source control and noise transmission path control. For example, in the aspect of noise source control, the company has successively issued a number of noise reduction topics for the main equipment body. By studying the internal structure of the main equipment, it puts forward the optimization scheme for the internal structure of the equipment to reduce the noise radiation energy, so as to achieve the noise control at the noise source. This kind of control effect at the noise source is the most direct and effective, but also the most difficult. In the aspect of noise transmission path control, sound absorption technology, sound insulation technology, noise elimination technology and damping technology are mainly adopted at present. In UHV substation, UHV main transformer is located in the central area of the station site, and its contribution to noise of plant boundary and noise sensitive buildings outside the station is relatively small, while high voltage shunt reactor is often located near the station boundary, The noise contribution to the noise sensitive buildings outside the plant boundary and the station is large, which has become the key object of noise control in UHV substation. Therefore, the control of sound transmission in UHV substation focuses on shunt reactor, such as heightening the plant boundary wall at the side of shunt reactor and installing sound insulation cover on the reactor[1]. This paper focuses on the influence of sound barrier, ground effect and acoustic interference effect on the sound propagation process. Based on the analysis of the sound barrier theory, the test site is built to measure the sound field distribution of the artificial sound source at different frequencies, analyze the influence of the shelter on the noise propagation path of the artificial sound source, and then study the firewall, the noise source and the noise source The influence of enclosure and other shelter on the transmission mode of substation noise. The second is based on the noise propagation theory of ISO 9613–2 ground effect, select the test site, carry out the sound propagation test of cement ground and green plant (lawn) ground under the condition of artificial sound source, analyze the ground effect noise attenuation under different frequencies and different receiving distances, and correct the corresponding attenuation items specified in the international standard ISO 9613–2. Thirdly, based on the sound source characteristics of shunt reactor obtained in topic 1, the interference sound field characteristics around the reactor are analyzed, and then the interference sound field measurement test scheme of shunt reactor in UHV substation is formulated. The field measurement is carried out to analyze the influence of acoustic interference on substation noise propagation mode, and to clarify the extent and scope of the influence of acoustic interference on substation reactor. Thus, the influence law of firewall, enclosure and ground on substation noise propagation is obtained, and the influence law of shunt reactor interference effect on substation noise propagation mode is obtained, which provides key technical support for UHV substation planning layout and acoustic environment impact assessment [2].