Power transformer winding deformation on-line detection method based on pulse coupling injection

Abstract

The invention discloses a power transformer winding deformation on-line detection method based on pulse coupling injection, and belongs to the technical field of electrical equipment on-line detection. The method comprises the steps that (1) a high-voltage nanosecond square-wave pulse generator generates high-voltage nanosecond pulse signals; (2) the high-voltage nanosecond pulse signals are injected into a protection circuit through signal injection and transmitted into a transformer signal sensor installed on a transformer casing pipe to be coupled to a winding; (3) a data acquisition module acquires the high-voltage nanosecond pulse signals and current response signals of the neutral point of the tail end of the winding and converts the high-voltage nanosecond pulse signals and the current response signals into digital signals; (4) a data processing module carries out Fourier transformation on the digital signals, works out a frequency-response curve of the winding, calculates characteristic parameters such as the correlation coefficient and the standard deviation of the frequency-response curve and judges the deformation degree of the transformer winding. By means of the method, non-intrusive on-line detection of winding deformation can be achieved. In addition, the method has the advantages that the detection speed is high, damage to an electric system is avoided, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of on-line detection of electric power equipment, and relates to an on-line detection method for winding deformation of a power transformer based on pulse coupling injection. Background technique [0002] Power transformer is the core equipment of substation, its safe and stable operation plays an important role in ensuring the reliability of power supply and improving economy. According to incomplete statistics, winding deformation accounts for nearly half of the various failure factors that cause transformer damage and outage. Transformer transportation, operation, insulation aging damage, explosion of dissolved gas in oil, earthquake and other force majeure can cause different degrees of deformation of the winding, especially in the case of a short-circuit at the external outlet of the transformer during operation, the short-circuit current in the winding forms a huge electromagnetic The force causes the...

AI Technical Summary

Problems solved by technology

However, this method can only be used offline, and cannot detect the deformation of the power transformer winding online, and cannot obtain the information of the winding deformation in time, so it is difficult to resist sudden failures

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