Resonant experimental device of dry-type power transformer partial discharge detection

A power transformer, partial discharge detection technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problem that the test device can only be carried by manpower

Inactive Publication Date: 2007-09-12
上海久隆电气设备试验有限公司 +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The constraints on the partial discharge field test of dry-type power transformers are mainly: dry-type power transformers with large capacity need to be equipped with lar

Method used

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  • Resonant experimental device of dry-type power transformer partial discharge detection

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] As shown in Figure 1, a resonance test device for dry-type power transformer partial discharge detection uses a three-phase 380V 50Hz power supply to input three single-phase variable frequency power supply devices to generate three single-phase power supplies with a phase difference of 120°. Connected in a star shape to obtain frequency conversion three-phase power supply, this power supply device has functions such as frequency modulation, voltage regulation, display and protection.

[0026] The three-phase power output from the frequency conversion device is input into the intermediate transformer. The intermediate transformer is composed of three single-phase double-winding non-discharge transformers. The high-voltage side is connected in a star shape, and the low-voltage side is connected in a delta shape to improve the output voltage waveform.

[0027] The high...

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Abstract

This invention relates to harmonic vibration test facilities of partial discharge detection of dry-type transformer. This invention includes three-phase power source of 380V 50Hz, frequency conversion power source, intermedial transformer, high voltage filter, high voltage measure equipment, compensator, sampling device of partial discharge signal, measure equipment of partial discharge. Compared with existing technique, this invention has enough experiment capacity. And the invention is easy to carry.

Description

technical field [0001] The invention relates to a detection test device for electric equipment, in particular to a resonance test device for dry-type power transformer partial discharge detection. Background technique [0002] The dry-type power transformer with solid insulation has the advantages of compact structure, no oil pollution, and good fire prevention, so it has been widely used in user substations of 35kV and below. However, solid cast insulation is often more prone to hidden process local defects, such as pores and impurity particles, etc. The partial discharge of these weak links may lead to penetrating dielectric breakdown and damage equipment, resulting in fatal hazards. [0003] Partial discharge testing is an effective means of detecting local defects in insulation. Therefore, for 35KV solid insulated transformers, etc., the partial discharge test has already been used as a specified item in the field test. However, for solid insulation power transformers,...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 邱永椿
Owner 上海久隆电气设备试验有限公司
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