Partial discharge interferometric monitoring device of transformer

Abstract

The invention relates to a partial discharge interferometric monitoring device of a transformer. The device comprises an additional electric field generator-a lightning surge generator, an optical monitoring system comprising a He-Ne laser and a Michelson interferometer, and an interference fringe capturing device-a CCD camera; wherein the Michelson interferometer comprises a beam expander, a beamsplitter and two reflectors M1 and M2, and a tested system is put in an object optical path of the Michelson interferometer. The partial discharge interferometric monitoring device can monitor the phenomena whether power equipment has electric spark and undergoes voltage and current jump in real time and the like, so as to alarm timely to prevent the occurrence of accidents such as fire disastersand damage of equipment or electronic elements, the device can be used in the field of power electronics, can quantitatively calculate electric field strength around a device in a switching process by measuring overshoot voltage and current caused in switching process of a power electronic device, thereby providing reference for parameter selection of the electronic device and design of a protective circuit; and the device is simple in structure, is greatly lowered in cost, is not contacted and has good security.

Description

technical field [0001] The invention relates to a monitoring technology, in particular to a transformer partial discharge interference monitoring device. Background technique [0002] Transformers have a wide range of applications and are one of the most important electrical products in power systems, especially in power transmission and transformation lines. In order to ensure the reliability and economy of power system power supply, online monitoring and fault diagnosis of transformers came into being. It can be seen from the structure of the transformer that the coils of the transformer are filled with transformer oil, which increases the dielectric constant and makes the transformer difficult to be broken down during operation, which is an important component of the transformer. During the long-term operation of the transformer, the transformer oil may be cracked and mixed with impurities, which will affect the normal operation of the transformer. How to use a convenie...

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Problems solved by technology

[0005] The present invention aims at the problems in the prior art that the operation is complex, time-consuming, real-time on-line monitoring cannot be carried out and early warning cannot be performed in time, and a transformer partial discharge interferometric monitoring device is proposed to realize real-time monitoring of electric sparks, voltage and current in electric equipment. Jump and other phenomena occur, give early warning in time

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