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Method for detecting micro 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: 2009-10-14
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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Problems solved by technology

[0005] In view of this, the present invention is to provide a method for detecting the small deformation of the transformer winding, so as to solve the above-mentioned problem that the small deformation of the winding cannot be detected for the transformer deformation detection

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  • Method for detecting micro deformation of transformer winding
  • Method for detecting micro deformation of transformer winding
  • Method for detecting micro 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 micro deformation of a transformer winding, which comprises the following steps: a pulse signal with a frequency higher than 1KHz is input into a transformer and the signals of an input terminal and an output terminal of the transformer are acquired by a sensor, after the signals acquired are processed, the transmission functions of the output terminal and the input terminal are computed, a correlation coefficient is computed by utilizing the transmission functions computed and a transmission function prior to the initial use of the transformer, if the correlation coefficient is judged to be smaller than the threshold value, an alarm signal of winding deformation is sent; and if the correlation coefficient is judged to be bigger than or equal to the threshold value, the acquired signals are processed and then saved into a database. The method for detecting micro deformation of transformer winding has simple measuring procedure, is easy to realize, can adjust measure precision on transformer deformation by adjusting the threshold value of the correlation coefficient and overcome the technology difficulty of deformation detection of the transformer for long time, 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 Applications(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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