Abstract: In dealing with the nuisance problem of an indoor-substation producing different frequency band noise when its reactors are in operation, a composite noise-suction technology is developed, which uses micro-perforated metal-fiber board-walls and soundproof doors coated with damping materials to block noise leakage. In order to improve the radiating efficiency of the reactors, the ventilation system with silencers is redesigned by using low-noise and automatic-cycle cooling technique to control noise transmits outward. By compare the noise data before and after reconstruction, the noise control effects and rationality of the new type structures are analyzed. The testing results show that, the noise of the substation control room basically meets the requirements of noise emission standards of class-Ⅱ-area after the restruction (i.e.≤50 dB ); the noise of the substation’s surrounding environment is nearly the same with background noise; the noise of the reactors’ room has also been significantly reduced. This study provides a basis for creating a quiet environment-friendly substations in smart grids.

Key words: indoor substation, reactor, noise control, anti-noise system, structure design