摘要
在复合电压作用下,换流变压器出线装置的电场分布不均匀。为此,根据实际结构建立了电场仿真模型,分析出线装置在交流、直流及极性反转电压作用下的电场分布,以及温度对其电场分布的影响。采用非线性绝缘材料并通过几何形状优化法实现了对出线装置电场分布的均化。研究表明:交流电压下,出线装置上的最大电场强度出现在均压球附近的油隙中;直流电压下,出线装置的最大电场强度出现在均压球上表面的绝缘层中。在极性反转电压下,由于空间电荷的作用,变压器油承担较高的电场强度。随着温度的降低,变压器油和绝缘纸板中的电场分布越趋不均匀,采用非线性绝缘材料可有效改善出线装置中的电场分布。
The electric field distribution in converter transformer outlet device under complex voltages is non- uniform. To solve this problem, on the basis of a numerical model established according to practical outlet device structures, we calculated electric field distributions under AC, DC, and polarity reversal voltages, and analyzed the influence of operating temperature on the distribution. Then we homogenized the distribution through shape optimization and using non-linear insulating materials. The research shows that, the maximal electric field intensity of the outlet device is in the oil gap near the tulip surface and the insulation coating on the tulip surface under AC voltages and DC voltages, respectively. Under polarity reversal voltages, transformer oil undertakes great electric field intensity due to the accumulation of space charge. The electric field distribution in oil and insulating paper trends to be more inhomogeneous as temperature decreases, while the electric field distribution in outlet devices can be effectively improved in uniformity by adopting non-linear insulating materials.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第12期2859-2868,共10页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2011CB211707)
国家自然科学基金(51277047)
黑龙江省杰出青年基金(JC2010-09)~~
关键词
换流变压器
出线装置
复合电场
绝缘结构
电场分布
非线性材料
converter transformer
outlet device
complex electric field
insulation structure
electric field distribution
non-linear insulating material
