183 / 2022-03-14 16:47:37

Electric Field Distribution law of Non-uniform Aging Oil-paper Insulation under Hybride Voltage combined with Temperature Field

non-uniform aging,oil-paper insulation,electrical field distribution

1. College of Electrical and Electronic Engineering,Harbin University of Science and Technology, Harbin, China


2. Electric Power Research Institute ,State Grid Heilongjiang Electric Power Company Limited, Harbin 150080

Convert transformer is the core equipment of HVDC transmission. Previous researches concentrated more on the water content, operating temperature and external voltage’s influence on the electric field distribution of the main insulation ,taking the aging distribution of the insulation material as a constant parameter .However, the actual aging state of the internal insulation  is obviously non-uniform , which will also affect the electric field distribution of the main insulation .This paper take all the factors above  into consideration to contribute a calculation model of the non-uniform aging transformer’s main insulation which based on the hot spot temperature through experiments .Looking forward that our research will have certain  significance for the transformer insulation design and operation.


This paper first analyzes the distribution of the non-uniform insulation aging by establishing a internal thermal road model of the transformer. Then, conduct a series of experiments to find out the influence that temperature, moisture, aging state have on the electrical conductivity, permittivity. Next, according to the actual non-uniform aging of the transformer internal insulation structure, a paper-oil-paper non-uniform aging structure model is constructed. Combined with the above experimental relationship, the calculation model on the electric field distribution of the typical insulation structure of the transformer is established. Last, analyze the influence that the external electric field has on the insulation structure of the converter transformer by changing the composite voltage parameters in the calculation model.


This project first analyzes the distribution of insulation non-uniform aging. Then quantified the influence that the temperature and moisture has on the electrical conductivity and permittivity of insulating material   of different aging degrees. establish a calculation model of the distribution of insulating electric field under non-uniform aging, then analyze the characteristics of the insulation field of converter transformer.


This paper establishes a more practical and quantifiable calculation model of insulation electric field distribution, explores the influence of several converter transformer valve side winding on the electric field distribution. It has certain reference significance for the transformer insulation design and operation and maintenance