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Device for detecting transformer winding state utilizing sweep frequency power source exciting

A technology of transformer winding and frequency sweep power supply, which is used in measuring devices, measuring electrical variables, instruments, etc., can solve the problems of complex frequency response waveform, many winding conditions, difficult quantitative criteria, etc., to avoid sudden short circuit, timely maintenance or repair. replacement effect

Inactive Publication Date: 2008-03-05
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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AI Technical Summary

Problems solved by technology

[0019] 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.

Method used

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  • Device for detecting transformer winding state utilizing sweep frequency power source exciting
  • Device for detecting transformer winding state utilizing sweep frequency power source exciting
  • Device for detecting transformer winding state utilizing sweep frequency power source exciting

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Experimental program
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Effect test

Embodiment approach

[0044] The device provided by the present invention utilizes the frequency sweeping power supply to excite and detect the state of the transformer winding, and the transformer winding is equivalent to a complex elastic system with concentrated parameters. The natural frequency of several orders of mechanical vibration will gradually move to a lower frequency direction, and the overall amplitude of the low frequency band will increase, which will change the vibration characteristics of the entire elastic system; and the deformation of the transformer winding will cause elastic vibration. The change of the system structure will change the vibration characteristics of the elastic system. Therefore, as long as the change of the vibration characteristics of the elastic system itself can be effectively detected and the change of the natural resonant frequency curve of the transformer winding can be analyzed, the looseness and deformation of the transformer winding can be detected.

...

specific Embodiment

[0061] In a substation, the low-voltage side of phase A of the main transformer suffered a short-circuit impact due to the breakdown of the rheology at the outlet, and the protection action of the pressure release device was activated. Later, due to system deployment reasons, it was decided to put it into operation again.

[0062] A power outage was carried out before operation for detection. First, the short-circuit impedance method was used for testing, and the test found that the short-circuit impedance basically did not change (the change value was less than 0.1%). Then, the FRA method was used to test and analyze the low-voltage winding of phase A of the transformer, and it was found that there was no abnormal change compared with the original measurement curve. According to the conclusions of these two electrical measurement methods, it is believed that the A-phase winding coil of the transformer has no deformation fault.

[0063] But, adopt device of the present invent...

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Abstract

The disclosed device includes core control module, excitation module and data acquisition and control module. The data acquisition and control module includes vibration sensor, charge amplifier and data acquisition unit connected to each other through circuits. The excitation module includes constant current source in frequency conversion and excitation transformer. Through analyzing change of natural resonance frequency curve of transformer winding, the disclosed device detects loosening status of winding, providing very high detection sensitivity.

Description

technical field [0001] The invention relates to a device for detecting the winding state of a transformer by using a sweeping power supply to vibrate. Background technique [0002] The transformer is an 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 system. [0003] When a sudden short-circuit fault...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/06G01R31/00G01R29/20
Inventor 姜益民朱之述金之俭吴钧
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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