In large substations, noise sources include mechanical noise, gas discharge noise, electromagnetic exposure sound, structural transmission noise, etc. For example, the noise generated by arc discharge and pulse discharge in transformers, cooling equipment and fans, power equipment and switchgear, the noise generated by electromagnetic field changes in power equipment and transformers and the noise generated by mechanical connections between building structures and equipment in substations, such as supports, pipelines and transmission lines, may be transmitted to the surrounding environment through the structures. The noise reduction in substations mainly involves two parts: first, reduce the noise of the transformer itself; second, take measures to isolate noise transmission pathways on surrounding pipes. For the substations, of which low-noise equipment has been selected or replaced and excellent layout has been realized, the latter can be adopted to achieve more complete exposure control. For example, the sound barrier for noise reduction is a good solution.