At present, the main transformer room gate of the prefabricated substation in use generally has the problem of sound leakage. If the noise prevention is not handled well, it will cause the substation noise to disturb the people and affect the construction of a harmonious society. In this paper, the cause of sound leakage is analyzed first. The sound leakage is mainly caused by the deformation and manufacturing error of the gate, the thin shell structure of the gate , and the sound leakage of the air inlet louver. Then, improvement measures are proposed on this basis. The noise reduction performance was optimized by improving the rigidity of the gate body, using multiple gate slits, and using a rotary air intake system. Finally, a new assembly-type substation main transformer room gate was designed accordingly. And a detailed description of the gate structure is presented. After adopting this design, the sound absorption and sound insulation performance of the main transformer room gate of the prefabricated substation has been greatly improved, the ventilation and heat removal performance has been significantly improved as well.
Shunt reactor plays an important role in transmission system, which can provide reactive power compensation for
transmission line and improve the quality of transmission line. But in the field operation, the shunt reactor will produce a
large degree of vibration and noise, and even endanger the safety of indoor substation floor. Therefore, based on the
vibration effect of shunt reactor, this paper puts forward the vibration variation law of shunt reactor under different DC
bias. In this paper, the finite element model of reactor is built by COMSOL finite element simulation software to analyze
the flux density distribution of reactor core under different direct flow injection, and then analyze the change trend of stress
and strain. Then the reactor vibration test system is built on site, and the vibration acceleration curve of the reactor is
collected and analyzed. The correctness of the reactor model is verified from the side. This study can provide a strong
reference for the reactor vibration and noise reduction.
As the prefabricated substation adopts the enclosure partition wall structure with light steel double-layer thin plate, the impact of its low-frequency noise on the environment is bound to be more prominent. This paper analyses the main causes and characteristics of noise in fabricated substations. The main source of noise in fabricated substations is transformers. The low-frequency components of the noise generated by them account for a relatively large proportion. The sound pressure level of noise is the highest at 200Hz and 315Hz. In order to reduce the impact of noise on the environment, this article introduces several low-frequency sound absorption and sound insulation structures used, analyses their principles, and proposes a sound absorption and sound insulation enclosure structure suitable for prefabricated power stations to improve its low-frequency sound absorption performance. By arranging diaphragm ribs, the structure moves the resonant frequency band to high frequency, which improves the sound insulation of low frequency. Owing to the adoption of more ribs and stiffening plates, the number of resonance peaks in the low frequency band is reduced, which is beneficial to the sound insulation performance of the double-layer structure. A fireproof board is added between the inner and outer partitions to reduce the influence of the gap on the sound insulation and improve the fireproof performance of the structure. The final sound insulation at low frequencies is higher than 40dB, which will greatly improve the noise pollution to the environment.
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