Low-noise power capacitor based on damping steel plate

Abstract

The invention discloses a low-noise power capacitor based on a damping steel plate. The low-noise power capacitor comprises a capacitor shell, a capacitor core, a sound insulation cavity and a terminal sheath, wherein the capacitor core is arranged inside the capacitor shell; the sound insulation cavity is of a closed cavity structure formed by combining an inner layer steel plate and an outer layer steel plate; the sound insulation cavity is arranged in the bottom of the capacitor shell; the closed cavity structure is fixed to the bottom of the capacitor through welding; a damping material isarranged between the outer layer steel plate and the inner layer steel plate, and a three-layer closed cavity structure is formed; the terminal sheath is arranged at the top of the capacitor shell. According to the low-noise power capacitor, the damping steel plate which has the advantages of low density, sound insulation and noise reduction, vibration absorption, high specific strength, high specific rigidity and the like are utilized, so that the vibration of the bottom of the power capacitor can be reduced; and the closed cavity formed by welding the damping steel plate is used for carrying out sound insulation on the main noise contribution frequency band, so that the noise of the bottom of the power capacitor is reduced, and the practical requirements of engineering are met.

Description

technical field [0001] The invention relates to the technical field of power equipment noise control, in particular to a low-noise power capacitor based on a damping steel plate. Background technique [0002] With the continuous improvement of the DC transmission level and the increase of the transmission power, the noise pollution generated by the shunt capacitor device is becoming more and more serious, which has far exceeded the field standard set by the national environmental department. Therefore, the audible noise generated by the filter capacitor device Noise pollution has become a problem that cannot be ignored. It has been proved by experiments that the noise frequency generated by the operation of power capacitors is 100HZ, 500HZ, 600HZ, 800HZ, 1100HZ, 1150HZ, 1200HZ, 1250HZ and other medium and low frequencies, and the generated noise mainly points to the bottom and top of the power capacitor. [0003] In order to solve the bottom noise problem, someone proposed ...

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Problems solved by technology

[0003] In order to solve the bottom noise problem, someone proposed a double-bottom structure to reduce the noise on the bottom of the power capacitor. Through a large number of experiments and conclusions, it was concluded that adding sound-proof cavities to the bottom and both ends of the capacitor element group is a more effective solution for capacitor noise control. In engineering A certain noise reduction effect has been obtained in the application, but it has not yet met the requirement of the capacitor noise level specified by the environmental department to be lower than 55dB, and there is no substantial reduction in the noise in the middle and low frequency regions radiated from the bottom of the capacitor

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