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Audible noise measuring circuit and method of power capacitor

A power capacitor and noise measurement technology, which is applied in the direction of noise figure or signal-to-noise ratio measurement, can solve the problems of loss of comparability of measurement results, increase of power capacitor noise noise measurement operation randomness, and no consideration

Inactive Publication Date: 2010-08-04
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

None of these factors are taken into account in current capacitor noise measurements
[0005] It can be seen that the simple method cannot be used to measure the noise of power capacitors
Otherwise, the arbitrariness of the power capacitor noise measurement operation will be greatly increased, making the measurement results lose comparability

Method used

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  • Audible noise measuring circuit and method of power capacitor
  • Audible noise measuring circuit and method of power capacitor
  • Audible noise measuring circuit and method of power capacitor

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Embodiment Construction

[0034] see figure 1 , 2 , a power capacitor audible noise measurement circuit, comprising a power capacitor, as a power capacitor under test, three power capacitors with the same specifications, models and technical parameters as the power capacitor under test are set outside the anechoic test area A power capacitor is used as a power capacitor for accompanying measurement; a power capacitor under test and three power capacitors for accompanying measurement are connected through wires, and a node is respectively set on the connection between two adjacent power capacitors, which are respectively marked as A . The adjustable reactors are respectively loaded on the positive and negative poles of the external high-voltage AC power supply, and an adjustable reactor is also connected between the wires drawn from nodes B and D, and then loaded on both ends of the external harmonic power supply, the whole The lapping circuit forms a bridge-type power capacitor loading circuit; seve...

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Abstract

The invention discloses audible noise measuring circuit and method of a power capacitor. The audible noise measuring method comprises the following steps of: selecting a noise-eliminating test area; mounting a power capacitor to be measured in the noise-eliminating test area; setting a power capacitor to be measured in accompany; building the power capacitor to be measured and the power capacitorto be measured in accompany into a bridge-type power capacitor loading circuit; respectively loading an external high-voltage alternating current power source and an external harmonic power source attwo ends of the bridge-type power capacitor loading circuit, wherein the whole bridge-type circuit achieves resonance state under the common action of power frequency voltage generated by the high-voltage alternating current power source and various time harmonic voltage generated by the harmonic power source; and obtaining various noise values generated by the power capacitor to be measured in an actual work state according to data which are measured by a noise sensor arranged around the power capacitor to be measured and are related to the noise. The invention reduces the random of the noise measuring operation of the power capacitor, so that a measuring result has more comparability and a set of noise measuring method of the power capacitor with systematicness, completeness, science and reasonability is formed.

Description

technical field [0001] The invention relates to the field of noise measurement methods, in particular to a power capacitor audible noise measurement circuit and a measurement method. Background technique [0002] The power capacitor is one of the key equipment in the HVDC transmission system. Due to the large number of power capacitors used, it has become the most important audible noise (hereinafter referred to as noise) radiation equipment in the DC converter station. With the enhancement of people's awareness of environmental protection, people have higher and higher requirements for the noise radiation performance of equipment. But at present, there is no clear regulation on the measurement method of the radiated noise of the power capacitor at home and abroad, which makes the noise value of the power capacitor not comparable. At the International Large Power Grid Conference in April 2002, although the method of calculating the noise sound pressure level by the vibratio...

Claims

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Application Information

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IPC IPC(8): G01R29/26
Inventor 李志远黄莹黎小林卢有盟黄国兴冯春林
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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