A multi-dimensional detection method for partial discharge of transformer bushing

Abstract

The invention discloses a multi-dimensional detection method for partial discharge of a transformer bushing, which comprises a multi-dimensional signal acquisition module, a multi-dimensional signal transmission module and a multi-dimensional signal combined analysis module. The multi-dimensional signal acquisition module includes a UHF signal sensor, a high-frequency current signal sensor, and an optical fiber sensor, which are used to collect the partial discharge signal of the transformer bushing; the multi-dimensional signal transmission module is used to transmit different forms of signals received by each sensor. ; The multi-dimensional signal combination analysis module is used to jointly analyze the three signals, realize the preliminary positioning of the PD source, and can judge the severity of the PD and predict the development of the PD. The invention comprehensively detects the insulation state of the transformer bushing based on various detection methods, and at the same time ensures the high efficiency and reliability of data transmission, and can accurately determine whether the transformer bushing is faulty and give an early warning, thereby avoiding accidents. occurs to ensure that the transformer can operate safely and stably.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection in power systems, and in particular relates to a joint detection method for partial discharge of a transformer bushing. Background technique [0002] The transformer bushing is a device that supports the outgoing wires of the transformer. Due to the frequent occurrence of bushing accidents in recent years, the main detection technologies based on transformer bushings mainly include capacitance / dielectric loss, dielectric spectrum detection and other methods. On the basis of the outage of the transformer, it is necessary to carry out a certain transformation on the end screen, which also brings security risks. Therefore, the current casing detection technology cannot detect faults in time or has defects such as low sensitivity, and new detection methods and ideas are urgently needed. [0003] The faults that occur during the operation of the transformer bushing include partial...

AI Technical Summary

Problems solved by technology

Due to the frequent occurrence of bushing accidents in recent years, the current main detection technologies based on transformer bushings mainly include capacitance / dielectric loss, dielectric spectrum detection and other methods. Generally speaking, the measurement accuracy is unstable and susceptible to electromagnetic interference. On the basis of the outage of the transformer, certain modifications must be made to the end screen, which also brings potential safety hazards

Therefore, the current casing detection technology cannot detect faults in time or has defects such as low sensitivity, and new detection methods and ideas are urgently needed

[0003] Faults that occur during the operation of transformer bushings include partial breakdown of the capacitive screen during operation, poor contact of the final screen, poor sealing of the bushing, oil leakage, etc. The emergency replacement of the bushing will cause the transformer to be out of service for a long time

It can be seen that the defects and faults of transformer bushings have the characteristics of large fault loss, wide range of fault influence, and long recovery time.

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