Space Electric Field Characteristics in Oil of Large-Scale Oil-Pressboard Structure under Various Voltage Stresses

被引：0

作者：

Gao C. ^{[1
]}

Qi B. ^{[1
]}

Han H. ^{[1
]}

Gao Y. ^{[2
]}

Li C. ^{[1
]}

机构：

[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing

[2] State Grid Shandong Rizhao Power Supply Company, Rizhao

来源：

Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2019年 / 34卷 / 22期

关键词：

Interface charge effect; Kerr electro-optic effect; Large-scale structure; Non-contact measurement; Oil-pressboard insulation; Space charge characteristic;

D O I：

10.19595/j.cnki.1000-6753.tces.181527

中图分类号：

学科分类号：

摘要：

The design of oil-pressboard/paper insulation structure mainly relies on simulation and verification test with simple equivalent test models, which lacks the physical entity verification under the large-scale structure. Based on Kerr electro-optic effect, a novel electric field measuring sensor was developed to capture the electric field in a large-scale converter transformer outlet device model under AC voltage, DC voltage and polarity reversal voltage. The test results indicated that ①under the positive DC voltage, as the voltage duration prolongs, the electric field in outer oil spacing decreases while those in inner and middle oil spacing both increase, and the field strength in steady state is increased by 2.04 times compared with the calculation results via RC (Resistance-Capacitance) model. Under the negative DC voltage, the tendency of electric field is similar to that under positive voltage; ②Under AC voltage, the maximum error between measured field strength and simulation result is 4.08%; ③Under the polarity reversal voltage, the faster the polarity reversal time, the higher the electric field strength after polarity reversal in the oil. In addition, the different interface charge accumulation conditions in each oil spacing could cause the zero-crossing point of electric field to be asynchronous with that of applied voltage. Based on the dynamic process of interface charge and its influence on space electric field, this paper proposes an electric analysis method for explaining the time-dependent characteristic mechanisms of electric field and interface charge in oil under DC voltage and polarity voltage. © 2019, Electrical Technology Press Co. Ltd. All right reserved.

引用

页码：4816 / 4826

页数：10

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