Transformer winding state diagnosis method, device and system, equipment and medium

Abstract

The embodiment of the invention discloses a method, device and system for diagnosing the winding state of a transformer, equipment and a medium. The method comprises the steps that a target signal source is controlled to inject broadband signals to M injection phases on the low-voltage side of the transformer at the output frequency i; acquiring the current amplitude of each voltage level group when the broadband signal is injected into each injection phase; according to the current amplitude of each voltage grade group of the mth injection phase, determining a state characteristic curve of each voltage grade group corresponding to the mth injection phase, m being 1 to M; calculating a curve correlation coefficient between the state characteristic curves of the same voltage grade group in each injection phase group; and determining the winding state of the transformer according to the curve correlation coefficient. By means of the mode, signal injection is convenient, the voltage grade of the low-voltage side of the transformer is low, the system impedance of the low-voltage line side is large, broadband signals can be injected into the transformer conveniently, the amplitude of current flowing into and out of the transformer can be obtained online in real time, and the winding fault diagnosis accuracy is higher.

Description

technical field [0001] The present invention relates to the technical field of power systems, and in particular, to a method, device and system for diagnosing a winding state of a transformer, equipment and medium. Background technique [0002] Large-scale transformers are the key equipment in the power system. The sudden failure of the transformer during operation seriously affects the safety and stability of the power system, which can cause major asset losses and large-scale power outages. Transformer accidents show that winding deformation is one of the main causes of accidents. Traditionally, the winding deformation fault monitoring is carried out by injecting signals from the high-voltage side capacitor bushing and neutral line of the transformer. Due to the small capacitance of the bushing, it is not conducive to signal injection, and due to the large impedance of the transformer medium and low-voltage sides, the injected signal flows to the system. The high-voltage ...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a transformer winding state diagnosis method, device and system, equipment and media, which can solve the lack of a reliable and effective online monitoring method for transformer winding deformation faults in the prior art, so as to realize the detection of transformer windings. The problem of real-time monitoring of winding state

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