Transformer high-frequency partial discharge and power-frequency earth current combination monitoring device

Abstract

The present invention provides a transformer high-frequency partial discharge and power-frequency earth current combination monitoring device. The device comprises a current sensor, a phase synchronization signal obtaining device, a front signal conditioner, a data collection processor and a background server. The input end of the current sensor is connected with the down conductor of a monitored transformer to obtain an earth current state quantity of the monitored transformer; the front signal conditioner is configured to perform front amplification of weak signals obtained from the current sensor and front attenuation of strong signals obtained from the current sensor; the data collection processor is configured to collect signals output by the front signal conditioner and perform analysis and abnormality determination; and the background server is configured to perform remote receiving and storage of collection and analysis data of the data collection processor and perform remote control of the data collection processor. The device is compact in structure, the detection device is high in reliability, and the transformer high-frequency partial discharge and power-frequency earth current combination monitoring device can provide basic analysis data for the partial discharge and insulation state analysis at the internal portion of the transformer.

Description

technical field [0001] The invention relates to the field of state monitoring of electric equipment, in particular to a combined monitoring device for transformer high-frequency partial discharge and power frequency grounding current. Background technique [0002] The operational reliability of power transformers is directly related to the safety and stability of power systems. Large-scale power transformers mainly adopt oil / paper insulation structure, and insulation failure caused by internal discharge is one of the important reasons affecting the reliable operation of transformers. Therefore, in the process of transformer operation, it is of great practical significance to effectively detect the change and development of partial discharge in the early stage to prevent latent and sudden insulation accidents. [0003] When the transformer core fails, it often appears as a partial discharge signal in the initial stage, and finally causes two points to be grounded, forming a ...

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Problems solved by technology

As a result, the temperature rise of the iron core is too high, local overheating, and even short circuit between turns

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