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Method for diagnosing operating state of windings in short-circuiting of transformer

A technology of working state and diagnosis method, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of complex frequency response waveforms, difficult quantitative criteria, and many winding conditions.

Inactive Publication Date: 2013-03-27
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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Problems solved by technology

[0017] The test sensitivity of the frequency response method is higher than that of the short-circuit impedance method. However, due to the complexity of the frequency response waveform, the judgment of the winding condition requires more experience, and it is difficult to form a clear quantitative criterion. Therefore, no criterion has been formed so far.

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  • Method for diagnosing operating state of windings in short-circuiting of transformer
  • Method for diagnosing operating state of windings in short-circuiting of transformer
  • Method for diagnosing operating state of windings in short-circuiting of transformer

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Embodiment Construction

[0062] The short-circuit impact test was carried out with a 10kV distribution transformer of a power company as the test object. During the test, the low-voltage winding was short-circuited, the high-voltage B-phase winding was loaded with power, and 25 short-circuit impacts were performed. After each short-circuit test, the power was cut off to perform short-circuit impedance detection, and the vibration signal during each short-circuit impact state was recorded at the same time. figure 1 shows the vibration waveform when the transformer winding is in good condition, figure 2 It shows the vibration waveform when the working state of the transformer winding deteriorates. Follow the steps below to judge the working state of the winding when the transformer is short-circuited:

[0063] (1) Collect the vibration signal of the transformer box wall, and select the vibration signal within the time period of 0.3s;

[0064] (2) Extend the left endpoint of the above-mentioned vibrat...

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Abstract

The invention discloses a method for diagnosing operating state of windings in short-circuiting of a transformer. The method includes the steps of firstly, acquiring a vibration signal of a box wall of the transformer when the short-circuiting of the transformer occurs; secondly, pre-continuing left and right ends of the vibration signal; thirdly, decomposing the continued vibration signal into a plurality of intrinsic-mode function components; fourthly, subjecting all the intrinsic-mode function components obtained by decomposing to Hilbert transformation so as to obtain Hilbert spectrum of the vibration signal; fifthly, acquiring Hilbert marginal spectrum and Hilbert energy according to the Hilbert spectrum; and sixthly, judging the state of the transformer windings according to changes in the Hilbert marginal spectrum and the Hilbert energy.

Description

technical field [0001] The invention relates to a signal monitoring method, in particular to a method for diagnosing the winding working state when a short circuit occurs in a transformer. Background technique [0002] The transformer is one of the most important equipment in the power system, and its operation stability has a great influence on the safety of the power system. With the increasing capacity of my country's power grid, the short-circuit capacity is also increasing. The huge electromagnetic force generated by the surge current formed by the short-circuit of the transformer outlet poses a serious threat to the mechanical strength and dynamic stability of the transformer winding. At present, the operating environment of substation equipment and lines is not optimistic. The deformation of transformer winding caused by external short circuit is a relatively common fault in the process of transformer operation, which poses a great threat to the safe operation of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/06
Inventor 李清蔡开穗王丰华金之俭
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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