紧凑型非晶合金油浸式变压器主绝缘结构设计

Compact Main Insulation Structure Design of Amorphous Alloys Oil-immerse Transformer

为使非晶合金油浸式配电变压器(以下简称AMDT)更紧凑、更经济,设计了一种AMDT紧凑型主绝缘结构,采用ANSYS有限元分析软件分别计算了AMDT紧凑型与传统型主绝缘结构的电场分布,比较了紧凑型与传统型主绝缘结构的电场分布情况,并配合工频耐压和雷电冲击试验对紧凑型模型进行了测试。仿真和试验结果表明:AMDT紧凑型主绝缘结构的端部电场强度比传统型分布均匀,最大电场强度小于油隙的最大电场强度值;试验击穿电压的裕度大于1.6倍的额定耐压值,因此紧凑型主绝缘结构是可靠的。通过比较紧凑型与传统型主绝缘结构变压器的主材成本,证明了紧凑型绝缘结构的先进性和实用性。

In order to optimize amorphous alloys oil-immerse distribution transformer （hereafter referred to as AMDT） inaspects of size and economy, we designed a compact insulation structure for AMDT. The electric field distribution inAMDTs with compact or conventional main insulation structure is calculated respectively using ANSYS. Reliability ofthe compact main insulation structure is tested by power-fiequency AC withstand voltage tests and lightning impulse testsThe simulation and test results show that the electric field of the compact main insulation structure is better distributedthan that of the conventional structure, and its maximum electric field intensity is less than that of oil gap. Moreover, thebreakup voltage margin of the compact main insulation structure is more than 1.6 times of the rated withstand voltage.The economy comparison between the compact and the conventional main insulation structures indicates that the compactone is advanced and applicable.