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Method for Detecting Small Deformation of Transformer Winding

A transformer winding and micro-deformation technology, which is applied in the detection field, can solve the problems such as the inability to detect the micro-deformation of the winding, and achieve the effect of easy promotion, overcoming technical difficulties, and simple measurement steps

Active Publication Date: 2011-11-30
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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Problems solved by technology

[0004] The conventional test method is used to detect the overall performance index of the transformer; in the special test, the frequency response method and the vibration analysis method can detect the deformation of the winding. The former has a better application effect and has been widely used in the power industry, but it cannot detect the small deformation of the winding.
The above-mentioned transformer deformation detection can detect large deformations, but cannot detect small deformations of windings.

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  • Method for Detecting Small Deformation of Transformer Winding

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Embodiment Construction

[0016] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.

[0017] Firstly, the principle of the method of the present invention is set forth. For a transformer, when the frequency is high (over 1kHz), the transformer iron core basically does not work, and each winding can be regarded as a coil consisting of distributed parameters such as resistance, capacitance, and inductance. passive linear two-port network. The equivalent passive linear two-port network can be found in figure 1 , assuming that the distributed inductance, longitudinal capacitance and ground capacitance per unit length of the winding are L, K, and C respectively, and neglecting the resistance of the winding (usually very small), this equivalent network can be characterized by the transfer function H(jω) for analysis. If the winding has mechanical deformation such as a...

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Abstract

The invention discloses a method for detecting the tiny deformation of a transformer winding, which includes: inputting a pulse signal with a frequency higher than 1KHZ into the transformer, collecting the signals of the input end and output end of the transformer through a sensor, processing the collected signals, and calculating the output end and the output end of the transformer. For the transfer function at the input end, the correlation coefficient is calculated through the calculated transfer function and the transfer function before the transformer is used for the first time. If it is judged that the correlation coefficient is less than the threshold, an alarm signal for winding deformation will be issued. If it is judged that the correlation coefficient is greater than or equal to the threshold, then The processed data of the collected signals are stored in the database. The method of the invention has simple measurement steps and is easy to implement, and the threshold value of the correlation coefficient can be adjusted to realize the measurement accuracy adjustment of the transformer deformation, which overcomes the long-standing technical difficulty in transformer deformation detection and is easy to popularize.

Description

technical field [0001] The invention relates to detection technology, in particular to a method for detecting small deformation of transformer windings. Background technique [0002] Among the various equipment in the power system, the transformer is one of the more expensive and important equipment, and its safety performance is of great significance to ensure the safety of the power grid. Statistics on transformers over the years have shown that 110kV and above power transformers in the country are damaged due to external short-circuit faults, accounting for 50% of the total number of accidents. Judging from the dismantling inspection, most of them are caused by winding deformation (such as axial and radial dimension changes, body displacement, winding distortion, bulging, etc.), and the main reason for these deformations is that the transformer insulation has been running for a long time. The electrothermal aging in the process leads to performance degradation or even da...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/06G01R23/02
Inventor 印华吴高林王勇李剑李毅宋伟王谦林伟
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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