NDLI: Research on the deterioration process of electrical contact structure inside the ±500 kV converter transformer RIP bushings and its prediction strategy

Content Provider	IET Digital Library
Author	Tian, Huidong Liu, Peng Zhou, Shiyi Wang, Qingyu Wu, Zehua Zhang, Jinyin Peng, Zongren
Abstract	Extra high-voltage converter transformer resin impregnated paper (RIP) bushing is used as the outlet device of the converter transformer, its safe operation is directly related to the reliability of the power system. Under the long-term effects of high current, strong mechanical stress and abrasion, the contact resistance of connection structure inside the bushing is prone to deteriorate. When the local overheating increases to a certain level, the insulation performance of bushing will decline and may lead to penetrating discharge. Therefore, it is vital to develop strategies for predicting the overheating fault of RIP bushings. In this study, firstly, one typical overheating fault of RIP bushing induced by the contact deterioration was diagnosed according to the fretting corrosive model and SF6 decomposition process. Secondly, using the three-dimensional electromagnetic-thermal-fluid finite element method, the temperature distributions of RIP bushing under the different overheating degrees were simulated. Finally, based on the maintenance experience and simulation results, the diagnosis strategies were proposed. The diagnosis principle and prediction strategies were successfully helped to maintain the faulted RIP bushings and wall bushings before a destructive overheating accident could occur, which provide a basic reference for the fault prediction and improvements of relative standards.
Starting Page	2391
Ending Page	2400
Page Count	10
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 12, Jun (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.0110
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-04-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Abrasion Bushings Connection Structure Connector Contact Deterioration Contact Resistance Corrosion Destructive Overheating Accident Deterioration Process Diagnosis Principle Eengineering Materials Science Electrical Contact Structure Extra High-voltage Converter Transformer Resin Impregnated Paper Bushing Fault Diagnosis Fault Prediction Faulted RIP Bushings Finite Element Analysis Fretting Corrosive Model Insulator Local Overheating Overheating Degrees Polymers And Plastics Power Converter Power Line Supports Power Supplies to Apparatus Power System Fault Power System Reliability Power Transformer Insulation Prediction Strategy Reliability Resins RIP Bushing SF6 Decomposition Process Strong Mechanical Stress Temperature Distribution Three-dimensional Electromagnetic-thermal-fluid Finite Element Method Transformer And Reactors Typical Overheating Fault Voltage 500 KV Wall Bushings
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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