Online detection method of transformer winding deformation based on vibration

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...

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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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