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Transformer winding state diagnosis method

A transformer winding and diagnostic method technology, applied to instruments, vibration measurement in solids, and vibration measurement, can solve problems such as multiple winding conditions, difficult quantitative criteria, and complex frequency response waveforms

Active Publication Date: 2014-05-28
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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AI Technical Summary

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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Embodiment Construction

[0069] The method for diagnosing the winding state of a transformer described in the technical solution will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0070] In this embodiment, a 10kV transformer winding is monitored and diagnosed according to the following steps:

[0071] (1) An exciter is placed on the winding of the transformer, and the 20kHz white noise signal V amplified by the power amplifier is i The input vibrator excites the transformer winding, and 20 vibration acceleration sensors are placed on the surface of the transformer winding to collect and record the vibration signal V of each measuring point. oi (i=1,2,...,20), the acquisition time is 0.04s.

[0072] (2) For the input white noise signal V i And the vibration signal V of each measuring point oi Perform Fourier transform to obtain the vibration frequency response curve H(ω) of the transformer winding: ( figure 1 shows the vibration freq...

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Abstract

The invention discloses a transformer winding state diagnosis method. The method comprises the following steps: (1) a vibration signal of each measurement point of a transformer winding is acquired; (2) fourier transform is performed on the vibration signal to obtain a vibration frequency response curve of the transformer winding; (3) fourier inversion is performed on the vibration frequency response curve to obtain a free vibration signal of the transformer winding; (4) wavelet transform is performed on the free vibration signal with Morlet wavelets; (5) a wavelet transform time-frequency diagram is formed; (6) wavelet ridges of the wavelet transform time-frequency diagram are extracted, wherein the vertical coordinate of each wavelet ridge is the inherent frequency of the transformer winding; (7) and the state of the transformer winding is judged according to the change of the inherent frequency.

Description

technical field [0001] The invention relates to a signal monitoring method, in particular to a diagnosis method for the winding state of 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 system. [0003] After the transform...

Claims

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Application Information

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IPC IPC(8): G01H1/12G01H1/14
Inventor 邓小文刘石王丰华耿超金之俭
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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