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Field direct-current partial discharge test system and method for converter transformer

A converter transformer, partial discharge technology, applied in the direction of testing dielectric strength, using acoustic measurement for testing, etc., to improve accuracy and eliminate external interference

Inactive Publication Date: 2019-04-05
云南电力技术有限责任公司
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Problems solved by technology

[0005] An on-site DC partial discharge test system and method for a converter transformer in the embodiment of the present application, to solve the problem that in the prior art, the existing DC partial discharge test equipment cannot perform the on-site DC partial discharge test of the converter valve side winding question

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  • Field direct-current partial discharge test system and method for converter transformer
  • Field direct-current partial discharge test system and method for converter transformer
  • Field direct-current partial discharge test system and method for converter transformer

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Embodiment Construction

[0039]In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] An on-site DC partial discharge test system and method of a converter transformer in the embodiment of the present application is to solve the problem that in the prior art, the existing DC partial discharge test equipment cannot perform the on-site DC partial discharge test of the converter valve side winding question.

[0041] The on-site DC partial discharge test of the valve side winding of the converter has certain difficulties, which are mainly reflected in the following aspects: (1) The discharge under DC voltage has nothing to do with the AC frequency, the repetition rate is low, and the phase cannot be used to distinguish the discharge signal from the Interference signal; (2) The voltage a...

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Abstract

The invention discloses a field direct-current partial discharge test system and method for a converter transformer. The system comprises a direct-current high-voltage generator, a voltage regulator,a control device and a partial discharge instrument; the control device is connected with the direct-current high-voltage generator; the voltage regulator is connected with an input unit sleeve in thedirect-current high-voltage generator; the direct-current high-voltage generator is connected with a valve side winding of the converter transformer through a voltage-sharing ring and an anti-coronawire; and the partial discharge instrument is connected with the valve side winding of the converter transformer. By adopting the system, the field direct-current partial discharge test of the valve side winding of the converter transformer is realized; the direct-current high-voltage generator is connected with the valve side winding of the converter transformer through the voltage-sharing ring and the anti-corona wire so as to eliminate field corona discharge interference or magnetic suspension discharge interference; and by adopting the multi-channel partial discharge instrument, whether the polarity of direct-current voltages in a plurality of channels is consistent with the polarity of a voltage provided by the direct-current high-voltage generator or not is recognized to judge, recognize and eliminate external interference pulses, so that the field test accuracy is improved.

Description

technical field [0001] The present application relates to the technical field of high-voltage electrical equipment testing, in particular to a system and method for on-site DC partial discharge testing of converter transformers. Background technique [0002] As an indispensable equipment in HVDC transmission project, converter transformer connects the converter valve and AC system. Among them, the winding of the converter transformer connected with the AC system is called the converter transformer network side winding, and the winding of the converter transformer connected with the converter valve is called the converter transformer valve side winding. During the operation of the converter transformer, the valve side winding of the converter transformer not only bears the stress generated by AC voltage, but also bears the stress generated by DC voltage and the stress of polarity reversal. Therefore, the insulation of the converter transformer, especially the insulation of t...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1209
Inventor 王臣玺韩德孝廖圣桑前浩胡亚超徐莹田小航蔡伟
Owner 云南电力技术有限责任公司
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