Dry-type transformer partial discharge on-line monitoring device and positioning method thereof

Abstract

The invention discloses a dry-type transformer partial discharge on-line monitoring device and a positioning method of the monitoring device, wherein a first ultrasonic transducer, a second ultrasonic transducer, a third ultrasonic transducer and a fourth ultrasonic transducer are respectively used for acquiring four ultrasonic signals in a partial discharge signal, and transmitting the ultrasonic signals to a signal processing unit; an ultrahigh frequency transducer is used for acquiring an ultrahigh frequency signal in the partial discharge signal, and transmitting the ultrahigh frequency signal to the signal processing unit; the signal processing unit is used for carrying out amplification and filtering processing on four ultrasonic signals and one ultrahigh frequency signal respectively, and transmitting the processed four ultrasonic signals and one ultrahigh frequency signal to a data acquisition card; the processed four ultrasonic signals and one ultrahigh frequency signal are respectively converted into four ultrasonic digital signals and one ultrahigh frequency digital signal and are stored up; after a trigger requirement is achieved, the four ultrasonic digital signals or the four ultrasonic digital signals and one ultrahigh frequency digital signal are transmitted to a computer; and the computer calculates so as to position a partial discharge position.

Description

technical field [0001] The invention relates to the technical field of monitoring, in particular to an on-line monitoring device for partial discharge of a dry-type transformer and a positioning method thereof. Background technique [0002] Dry-type transformer is one of the main equipment of power system, widely used in special occasions such as oil refinery and offshore oil platform. Statistics show that the main faults of dry-type transformers are mainly insulation faults, and the insulation faults are mainly manifested in the deterioration of insulation. On the other hand, partial discharge is not only the cause of insulation degradation, but also the manifestation of insulation degradation. The detection of partial discharge can reflect the insulation status of the dry-type transformer in advance, find out the insulation defects inside the dry-type transformer in time, and prevent the occurrence of latent and sudden accidents. Therefore, timely and effective detection...

AI Technical Summary

Problems solved by technology

[0005] The accuracy and sensitivity of the partial discharge ultrasonic positioning method are not high, the main reason is that the time delay error of ultrasonic propagation is too large

Because the internal structure of the dry-type transformer is complex, the ultrasonic signal is affected by various factors such as refraction, reflection and loss when propagating in different media such as resin and metal of the dry-type transformer, and the actual time delay estimation for positioning is often not obtained accurately.

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