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Ceramic capacitance sensor for ultra-high frequency on-line monitoring local high-voltage discharge

A ceramic capacitor and partial discharge technology, which is applied in the field of on-line monitoring of the insulation state of large-scale power equipment, and in the field of sensors, can solve the problems of reduced sensitivity and reliability of measurement results, pulse waveform distortion, and unsuitable neutral point, etc., and achieves compact structure and durable The effect of high electric strength and high sensitivity

Inactive Publication Date: 2003-05-28
西安博源电气有限公司
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Problems solved by technology

[0004] At present, most of the partial discharge systems that have been put into operation in China use the neutral point monitoring method, but in fact the neutral point is not suitable for partial discharge monitoring: for high-voltage motors, partial discharge is more likely to occur in the area near the phase outlet. In this way, the discharge pulse must have a long-distance transmission in the entire stator winding to reach the neutral point.
Therefore, for a complex capacitive network such as a motor winding, the final pulse will be severely distorted due to waveform distortion and amplitude attenuation
And at the neutral point, the sensitivity and reliability of the measurement results are greatly reduced due to the aliasing of three-phase discharge signals and the aliasing of discharge signals from other high-voltage equipment.

Method used

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  • Ceramic capacitance sensor for ultra-high frequency on-line monitoring local high-voltage discharge
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  • Ceramic capacitance sensor for ultra-high frequency on-line monitoring local high-voltage discharge

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Embodiment Construction

[0030] In order to understand the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and the embodiments given by the inventor.

[0031] see Figure 1~2 , figure 1 It is a side sectional view of the ceramic capacitive sensor of the present invention; the symbols in the figure respectively represent: 1-ceramic capacitor core, 2-represents the conductive metal rod of the upper electrode, 3-represents the conductive metal strip of the lower electrode, 4-represents the cable fastening bolt, 5-represents the lower electrode lead fixing screw, 6-represents the connecting cable conductor, 7-bus connection cable, 8-small epoxy resin umbrella group, 9-epoxy resin large umbrella group, 10-fixing bolt; figure 2 yes figure 1 The left view of ; the symbols in the figure represent respectively: 5-lower electrode lead wire fixing screw, 10-fixing bolt;

[0032] It can be seen from the structural di...

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Abstract

A UHF ceramic capacitor sensor for in-line monitor of local high-voltage discharge is composed of electrically insulating shell packaged by epoxy resin and the ceramic capacitor core with upper and lower copper electrodes and their conducting metal rod and metal strip. Its advantages are high sensitivity and minimal distortion. When a pair of such sensors are connected to the bus of one phase of electric generator, an anti-interference method for discriminating pulse delay can be implemented.

Description

1. Technical field [0001] The invention belongs to the on-line monitoring technology of the insulation state of large electric equipment, and relates to a sensor, in particular to a ceramic capacitance sensor for high-voltage partial discharge ultra-high frequency on-line monitoring. 2. Background technology [0002] Most of the existing on-line partial discharge monitoring systems for generators in China use sensors installed on the neutral point lead-out line (divided into two methods: voltage coupling and current coupling). In the neutral point ungrounded or impedance grounded system, the neutral point parallel coupling capacitor is used to collect the discharge signal; in the directly grounded system, two high-frequency current transformer clamps are used to collect the discharge signal on the ground wire. This neutral point monitoring method has a low working voltage (only a few V in normal operation), and is easy to install and debug, so it is adopted by many monitorin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06
Inventor 徐阳陈维王凯邱昌容冯义曹晓珑
Owner 西安博源电气有限公司
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