Needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device

An ultra-high frequency signal, medium space technology, applied in the field of electrical variable measurement

Inactive Publication Date: 2014-06-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this prior art compares with the present invention, this prior art can only measure the distribution of space charge of solid medium of pin-plate electrode

Method used

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  • Needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device
  • Needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device
  • Needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device

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Embodiment 1

[0023] Such as figure 1 As shown, this embodiment includes: metal pressure equalizing ball 1, needle electrode 2, inner insulator 3, outer insulator 4, height adjustment gear 5, shielding cylinder 6, sensing and measuring antenna 7, lower electrode 8, piezoelectric film 9. The sound wave absorbing layer 10 and the shielding box 11, wherein: the metal pressure equalizing ball 1 is connected to the upper end of the needle electrode 2, the needle electrode 2 passes through the through hole in the middle of the inner insulating member 3, and the inner insulating member 3 passes through the outer insulating member 4 The through hole of the height adjustment gear 5 is matched with the tooth structure on the outer insulator 4, and the relative position of the inner insulator 3 and the outer insulator 4 can be adjusted by rotating the height adjustment gear 5 to select a suitable needle-plate distance. The surface of the lower electrode 8 is provided with a concentric T-shaped groove ...

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Abstract

Provided is a needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device in the field of electric variable measuring. An inner insulation piece is arranged in the middle of an outer insulation piece in a sleeved mode. The outer side of the inner insulation piece is provided with a tooth structure. The top end of a needle electrode is provided with a metal voltage-sharing ball. The bottom end of the needle electrode penetrates through middle through holes of the inner insulation piece and the outer insulation piece respectively. A height adjusting gear is matched with the tooth structure on the outer insulation piece. By rotating the height adjusting gear, the relative positions of the inner insulation piece and the outer insulation piece are adjusted, the proper distance between the needle electrode and a lower electrode is selected, a voltage pulse is applied at the top end of the needle electrode, vibration of a liquid oil sample to be detected is generated, mechanical wave signals are sent out, the mechanical wave signals are received by a piezoelectric film and are converted into voltage signals, and accordingly space charge distribution in the liquid oil sample to be detected is reflected. Space charge and partial-discharge ultrahigh-frequency signal synchronous measurement under needle-plate electrodes of liquid or solid media is achieved.

Description

technical field [0001] The invention relates to a device in the field of electric variable measurement, in particular to a device for synchronously measuring the space charge of a needle-plate electrode medium and a partial discharge ultra-high frequency signal. Background technique [0002] Partial discharge is an important factor leading to insulation cracking and failure. When partial discharge occurs, it can generate ultra-high frequency signals with a frequency up to 3GHz. The occurrence of partial discharge can be judged through the measurement of ultra-high frequency signals. At present, there are many explanations and speculations about the mechanism of partial discharge in oil, but they have not been reached. Unified opinion. Needle-plate electrodes are often used to simulate and study the characteristics of partial discharges generated by typical defects. Studying the space charge distribution in the oil under the needle-plate electrode can help to explain the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R29/24
Inventor 张倩吴建东兰莉尹毅
Owner SHANGHAI JIAO TONG UNIV
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