Capacitor end portion contact state detection method

A technology of contact state and detection method, which is applied in capacitor testing, instrumentation, measuring electricity, etc., can solve problems such as application limitations of metallized film capacitors, and achieve the effect of simple determination method, high feasibility, and good detection effect

Inactive Publication Date: 2017-12-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gold-sprayed structure at the end is the main reason why the application of metallized film capacitors in the field of pulse power is limited

Method used

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  • Capacitor end portion contact state detection method
  • Capacitor end portion contact state detection method
  • Capacitor end portion contact state detection method

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0018] The metallized film capacitor provided by the present invention is generally formed by overlapping two single-sided metallized films and winding them around a mandrel, and spraying gold on both ends as electrodes after winding. A cross-sectional schematic diagram of a metallized film capacitor is shown in figure 1 As shown, the width of the metal electrode in the figure is b e , the ...

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Abstract

The invention discloses a capacitor end portion contact state detection method comprising the following steps: determining whether a to-be measured metalized film capacitor equivalent series resistance ESR is bigger than a threshold or not, if yes, the capacitor end portion contact state is poor, otherwise, the capacitor end portion contact state is good; the capacitor equivalent series resistance ESR parameter is the metalized film capacitor equivalent series resistance measured under 100Hz; the threshold is the metalized film capacitor equivalent series resistance theory calculating value under 100Hz. The method uses the capacitor 100Hz equivalent series resistance ESR parameter to detect the end portion contact state, thus preventing the capacitor temperature rise caused by poor end portion contact state under pulse current, preventing capacitor failure under electromotive force effect, and preventing severe influences on discharge efficiency and discharge waveform; the method can conveniently detect the capacitor end portion contact state, thus easily removing capacitors with poor end portion contact state from a batch of capacitors, and selecting the capacitors with good end portion contact state.

Description

technical field [0001] The invention belongs to the technical detection field of electrical equipment, and more specifically relates to a detection method for the contact state of a capacitor end. Background technique [0002] The loosening or detachment of the contact between the gold-sprayed layer and the metallized film electrode is one of the main reasons for the failure of the capacitor. When the capacitor works in AC steady state, the gold-sprayed layer falls off rarely occurs, but when the capacitor works in a high-field-strength pulse state, under the action of high peak pulse current, the gold-sprayed layer falls off from time to time . Studies have shown that the pulse current withstand capability of metallized film capacitors depends on the terminal contact state of the capacitor. When the pulse current flows, the electrical stress and mechanical stress generated lead to the aging of the terminal contact state of the metallized film capacitor. In the actual capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/64
Inventor 李化李露李立威陈麒任刘毅林福昌
Owner HUAZHONG UNIV OF SCI & TECH
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