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Positioning method and device for reestablishing local discharge ultrasonic source of transformer

A technology of partial discharge and positioning method, which is applied in the direction of testing dielectric strength, etc., can solve the problems of massive sample size, high sampling rate, cross-discrete, etc., and achieve the effect of overcoming the large amount of data

Active Publication Date: 2015-06-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

The advantage of this method is that it can perform multi-point positioning. The disadvantage is that in order to build a database, it is necessary to perform cross-discrete on parameters such as multi-source, any position, and various discharge quantities.
In order to achieve high-precision positioning, the sampling rate of each parameter is large, and a large number of samples are required as a whole. The time required for the construction process is unbearable, or even impossible.

Method used

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  • Positioning method and device for reestablishing local discharge ultrasonic source of transformer
  • Positioning method and device for reestablishing local discharge ultrasonic source of transformer
  • Positioning method and device for reestablishing local discharge ultrasonic source of transformer

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028]The invention utilizes the sound source reconstruction method to locate the ultrasonic source. The pulse current of the partial discharge of the transformer excites the ultrasonic signal, and the discharge point of the transformer is the ultrasonic source point. The ultrasonic signal propagates inside the transformer from the point of discharge. The sensor array composed of multiple ultrasonic sensors installed inside the transformer records the ultrasonic signals received by the ultrasonic sensors. According to the sound pressure wave equation and the transformer sound propagation model, the time-reversal method is used to calculate the ultrasonic signal received by each ultrasonic sensor. towards the sound field. Then the reverse sound field is superimposed to obtain the focused sound field to realize the reconstruction of the sound s...

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Abstract

The invention discloses a positioning method and a device for reestablishing a local discharge ultrasonic source of a transformer. The positioning method comprises the following steps of: exciting a lorentz force ultrasonic signal by pulse current generated by local discharge of the transformer; mounting a sensor array consisting of a plurality of ultrasonic sensors inside the transformer; recording an ultrasonic signal received by the ultrasonic sensor; inverting an ultrasonic source and positioning a local discharge point according to a propagation model of sound waves in the transformer by adopting a time reversal inverse source analytic method; and meanwhile, discharge capacity information is acquired and the discharge capacity is estimated.

Description

technical field [0001] The invention relates to a method for detecting partial discharge of a transformer, in particular to an ultrasonic detection method and a device for the partial discharge of a transformer. Background technique [0002] Most of the current large-scale power transformers are oil-immersed power transformers, and their insulation structures are mainly solid-oil insulation structures composed of oil, paper, cardboard and other solid insulation. Although it has sufficient electrical strength and excellent mechanical properties in design, accidental factors in the manufacturing process will cause some congenital local defects, such as bubbles, cracks, suspended conductive particles and electrode burrs. It is these defects that cause the electric field strength in certain areas inside or on the surface of the insulator to be higher than the average electric field strength. When the breakdown field strength in these areas is lower than the average breakdown fie...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 夏正武刘国强李艳红吴清龑夏慧李士强
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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