Transformer winding ultrasonic online three-dimensional imaging monitoring method and system

Abstract

The invention provides an on-line ultrasonic three-dimensional imaging monitoring method for transformer windings. The method comprises steps of: disposing an ultrasonic transmitting probe and an ultrasonic receiving probe on a transformer housing so that an ultrasonic wave is reflected at the measured points of a winding; according to a time difference between ultrasonic wave transmission and ultrasonic wave reception, a wave velocity, and the positions of the ultrasonic transmitting probe and the ultrasonic receiving probe, calculating winding distance and transforming measured point positions into coordinate values in a transformer winding model coordinate system, wherein the distance from the transformer housing at the ultrasonic transmitting probe to the measured point is used as a coordinate value of the measured point in an axis; obtaining the three-dimensional coordinate values of a plurality of measured points and generating a transformer winding three-dimensional image; and comparing the transformer winding three-dimensional image with a pre-established transformer winding three-dimensional model image to determine whether the transformer winding is deformed or not. The method can carry out on-line monitoring on the transformer without power outage to ensure safe and reliable operation, and can realize the quantitative and visual inspection and analysis of a transformer winding state.

Description

technical field [0001] The invention relates to the field of transformer winding detection, in particular to a transformer winding ultrasonic online three-dimensional imaging monitoring method and system. Background technique [0002] Power transformers are important and expensive. During transportation, they may be damaged immediately due to the strong electrodynamic force of accidental collisions or system short-circuit faults, but generally only a certain degree of winding deformation occurs. If the deformation is not found and repaired in time, It may cause power system failure. After the transformer winding is deformed, some damage accidents occur immediately, while others can still run for a long time. Transformers whose windings have been deformed will continue to operate for quite a long time. If they cannot be repaired in a timely manner, the cumulative effect will develop further. Correct and timely deformation detection can ensure that the faulty components of t...

AI Technical Summary

Problems solved by technology

Due to the increasing number of power transformers put into the power grid in my country, the traditional offline detection method has been difficult to meet the requirements

The traditional short-circuit impedance method, low-voltage pulse method, and frequency response analysis method have achieved some results in the detection of winding deformation, but these traditional methods have problems such as inability to detect online, poor sensitivity, low anti-interference ability, and difficulty in data acquisition. Shortcomings, not to mention the inability to conduct real-time detection and intuitive analysis of the winding

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