NDLI: Thermal aging test for transformer oil–paper insulation under over-load condition temperature

Content Provider	IET Digital Library
Author	Yang, Li Jun Sun, Weidong Gao, Sihang Hao, Jian
Abstract	The accelerated thermal aging test is an effective method to simulate insulation material degradation in oil-immersed transformers. Traditionally, cellulose paper and mineral oil are heated up together at the same temperature when a thermal aging test is conducted. However, variation occurs between laboratory results and field conditions. Temperature gradients exist in real transformers, and each part of the winding is aged under various conditions. In order to rebuild temperature gradients and conduct a thermal aging test under this condition. First, 3D models with designed U-shape wingding which can guarantee different parts aged simultaneously under different temperatures are calculated for temperature field analysis. Then a thermal aging platform with a large current generator is proposed to construct temperature gradients in a thermal aging test. The large current generator helps to heat up the copper winding. Temperature sensors are installed in the aging tank to monitoring winding and oil temperature and control temperature. The aging temperature is selected according to the standard IEC 60076-7 for the over-load condition. The degree of polymerisation of the insulation paper is measured and properties of each layer of the insulation paper are analysed. Other aging products under both traditional test and method in this study are compared.
Starting Page	2846
Ending Page	2853
Page Count	8
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 12, Jul (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.1334
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-01-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	3D Model Accelerated Thermal Aging Testing Ageing Cellulose Paper Copper Winding Current Generator IEC 60076-7 Standard Insulation Material Degradation Simulation Life Testing Mineral Oil Oil Temperature Monitoring Oil-immersed Transformer Organic Insulation Paper Polymerisation Power Transformer Insulation Power Transformer Testing Sensing Device And Transducers Temperature Field Analysis Temperature Gradient Temperature Measurement Temperature Sensor Temperature Sonsor Thermal Variables Measurement Transformer And Reactors Transformer Oil Transformer Oil-paper Insulation Transformer Windings U-shape Winding
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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