Aging properties of vegetable-oil-paper insulation with controlled dry air

被引：0

作者：

State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400030, China ^{[1
]}

不详 ^{[2
]}

不详 ^{[3
]}

机构：

[1] State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University

[2] China Electric Power Research Institute

[3] ABB (China) Limited

来源：

Gaodianya Jishu | / 6卷 / 1460-1468期

关键词：

Degree of polymerization; Dry air; NOMEX paper; Oil-paper insulation; Open-type transformer; Thermal aging; Vegetable oil;

D O I：

10.3969/j.issn.1003-6520.2013.06.025

中图分类号：

学科分类号：

摘要：

In order to explore the thermal aging properties of oil-paper insulation composed of vegetable oil and NOMEX paper in controlled dry air, and to provide reference for the application of new types of oil-paper insulation in open types of transformers, accelerated thermal aging tests with controlled dry air injection was performed at 170°C for 216 h. The oil-paper insulation samples were composed of BIOTEMP oil (vegetable oil), NOMEX paper, and 3042 pressboard. Some aging parameters, including degree of polymerization (DP) of pressboard, tensile strength of NOMEX paper, furfural concentration of oil, and acid number and water content of oil, were measured and recorded during the aging process. The variations of the parameters against the aging time, the correlation among these parameters, and the explanations for them were analyzed systematically. Furthermore, the results were compared with those of mineral oil in detail. It is found that the decrease of DP of pressboard fits into the second-order kinetic model; the tensile strength of NOMEX paper increases slightly with the development of aging; the moisture content of oil and paper initially increases and then decreases, however, the moisture content of pressboard fluctuates; the logarithm of the furfural concentration in oil is in a good linear relationship with DP of pressboard; the acid value, breakdown voltage and dissipation factor of oil can be applied to evaluate the condition of accelerated thermal aging of vegetable oil with controlled dry air injection.

引用

页码：1460 / 1468

页数：8

共 33 条

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