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Online detection method of transformer winding deformation based on vibration

A technology for transformer windings and detection methods, applied in the field of power transformers, can solve the problems of low sensitivity, poor repeatability, and susceptibility to electromagnetic interference, and achieve the effects of easy popularization and application, strong engineering practicability, and clear methods

Inactive Publication Date: 2017-07-21
HOHAI UNIV
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Problems solved by technology

The short-circuit impedance method is based on measuring the change of transformer leakage inductance. Although online detection can be realized, the sensitivity is low; the low-voltage pulse method judges the deformation of the winding by comparing the response waveform of the applied low-voltage pulse, but it is susceptible to electromagnetic interference and has low repeatability. The frequency response method is mainly to judge the winding deformation by measuring and comparing the frequency response of the transformer. This method can reduce electromagnetic interference and has high repeatability, but it is easily affected by uncertain factors.

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  • Online detection method of transformer winding deformation based on vibration
  • Online detection method of transformer winding deformation based on vibration
  • Online detection method of transformer winding deformation based on vibration

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Embodiment Construction

[0026] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0027] figure 1 Shown is a system structure block diagram of the embodiment of the present invention, which mainly includes a PC signal processing module, a data acquisition instrument, a signal conversion device, 3 vibration sensors and a current transformer. Three of the vibration sensors are respectively connected to the data acquisition instrument through the signal conversion device. And the three vibration sensors are respectively placed on the top surface of the oil tank of the power transformer, respectively located directly above the center between the high-voltage winding and the low-voltage winding of each phase, and the data acquisition instrument transmits the signals collected by each vibration sensor to the PC signal processing module , the signal is processed, calculated and stored by the PC, and the fault judgment is carried o...

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Abstract

The invention discloses an online detection method of transformer winding deformation based on vibration. A PC processing module, a data acquisition instrument, a signal conversion interface, a current transformer and vibration sensors are comprised. The vibration sensor and the current transformer are connected to the signal conversion interface and the data acquisition instrument. Vibrators are distributed at the surface of the oil tank of a transformer. The data acquisition instrument collects vibration signals detected by the vibration sensors and transmits the vibration signals to the PC processing module. A PC processes, calculates and stores the collected vibration signals and current value and carries out judgment of a winding deformation degree. According to the amplitudes of the vibration signals and change characteristics with the winding deformation degree of the transformer, and 100Hz to 600 Hz signals in the vibration signals are used to judge the transformer winding deformation. According to the method, the real-time online monitoring of the transformer winding deformation can be realized, the vibration signals are sensitive to the winding deformation, and the method is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of power transformers, in particular to a vibration-based online detection method for transformer winding deformation. Background technique [0002] The power transformer is one of the important electrical equipment in the power system. Whether the transformer can operate safely and stably will greatly affect the safe operation of the entire power grid. Transformer winding deformation is an important factor affecting its safe and stable operation. According to statistical analysis, transformer winding deformation accounts for more than 60% of transformer faults. Therefore, online detection of winding deformation is one of the important measures to ensure the safe operation of power transformers. [0003] During the normal operation of a power transformer, its various components, especially the windings of the transformer, must bear the effects of high voltage, strong magnetic field, mechanical load, and ther...

Claims

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Application Information

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IPC IPC(8): G01R31/06G01B7/16
CPCG01B7/16G01R31/72
Inventor 吴明明马宏忠王彤张艳付明星黄春梅魏海增
Owner HOHAI UNIV
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