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Power capacitor with noise-reducing device

A technology of power capacitors and capacitors, which is applied in the direction of anti-noise capacitors, feedthrough capacitors, fixed capacitor shells/packages, etc., and can solve the adverse effects of production and life of surrounding residents, large capacity of filter capacitor devices, and insignificant noise reduction effects, etc. problems, to achieve the effects of minimal heat dissipation, low cost, and easy production and manufacturing

Active Publication Date: 2017-05-31
XIAN XD POWER CAPACITOR CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In ultra-high voltage and ultra-high voltage power systems, this type of parallel and filter capacitor device has the characteristics of large capacity, large floor area and high tower. Under certain conditions, the noise of all capacitor units will reach a level greater than 60dB after synthesis. Audible noise, which adversely affects the production and life of surrounding residents
[0003] At present, most of the noise reduction schemes for power capacitors are internal noise reduction. This noise reduction effect is not very obvious, and it brings difficulties to production and maintenance.

Method used

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  • Power capacitor with noise-reducing device

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0035] refer to figure 1 As shown, in the power capacitor of the noise reduction device of the present invention, a noise shielding device is installed at the bottom of the power capacitor housing 1, and the device position is composed of two parts, namely the damping material and the metal shell cover 6. refer to figure 2 , figure 2 (a) is a schematic diagram of fully filled high-density particles; figure 2 (b) is a schematic diagram of the combination of filling high-density particles and air bubbles; the damping material is filled with high-density particles 3 or air bubbles 2 or both; a cavity 5 is formed between the damping material and the metal shell, and the cavity can be installed with sound-absorbing materials Or the cavity 5 can be filled with damping material, and the...

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Abstract

The invention provides a power capacitor with a noise-reducing device. A metal case cover is sealed and connected with a capacitor case. The metal case cover is filled with a damping material, and the damping material is filled with high-density particles and / or bubbles. The quality m and the density of the high-density particles and the change of the equivalent elastic coefficient k and equivalent damping coefficient C of the damping material are regulated to control the frequency of the noise-reducing device, so that the most noise of the capacitor is absorbed. Compared with the common capacitor, the noise radiation quantity of the power capacitor is greatly reduced, the device cost is low, the process is simple, and the production and manufacture are easy. The influence to the heat dissipation of the power capacitor is small, and the stability of the power capacitor is not affected. The noise is reduced under the precondition of ensuring the safety operation of the power capacitor, and the installation and maintenance are convenient.

Description

【Technical field】 [0001] The invention relates to the field of power capacitors, in particular to a power capacitor with a noise reduction device. 【Background technique】 [0002] With more and more EHV and UHV DC transmission projects, a large number of harmonics are generated during the AC-DC conversion process of EHV and UHV DC transmission systems. When the harmonic current passes through the AC parallel, filter capacitor and DC filter capacitor, the medium in the capacitor unit is subjected to the action of the alternating electric field force and vibrates, causing the surface of the capacitor unit shell to vibrate, and the air next to the surface of the capacitor unit shell vibrates to produce sound. In ultra-high voltage and ultra-high voltage power systems, this type of parallel and filter capacitor device has the characteristics of large capacity, large floor area and high tower. Under certain conditions, the noise of all capacitor units will reach a level greater th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/224H01G4/35
CPCH01G4/224H01G4/35
Inventor 姚成尤鸿芃林丽妲
Owner XIAN XD POWER CAPACITOR CO LTD
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