冲击电压下变压器油中空间电场测量方法及装置

发布时间：2018-02-08 16:15

本文关键词： 变压器油 Kerr效应冲击电压灵敏度误差　出处：《中国电机工程学报》2017年06期 　论文类型：期刊论文

【摘要】：冲击电压下油纸绝缘结构的电场分布特性是变压器绝缘设计的关键环节,目前主要利用仿真软件基于容性场等效进行变压器电场的计算,并在容性场计算结果的基础上乘以一定的裕度系数,作为冲击电压下变压器绝缘涉及的参考依据,但仿真结果缺乏实测手段的支撑和验证。该文提出了冲击电压下油纸绝缘空间电场分布的非接触式实时测量方法,构建了由光路系统、光电转换器件、密封腔体、冲击电源构成的油纸绝缘空间电场测量装置,并利用平板电极对装置性能进行了标定和检验。在17~47k V雷电冲击电压下获得了电场测量值曲线和电场实际值曲线,并用相关系数描述二者之间的吻合程度。结果表明本装置最小可测峰值为3.49k V/mm的雷电冲击电场,最大误差小于3.56%,满足冲击电场测量的试验需求。
[Abstract]:The electric field distribution characteristic of oil-paper insulation structure under impulse voltage is the key link of transformer insulation design. At present, the electric field of transformer is mainly calculated by using simulation software based on capacitive field equivalence. And on the basis of capacitive field calculation results, multiplied by a certain margin coefficient, as the reference basis of transformer insulation under impulse voltage, However, the simulation results are short of the support and verification of the measured results. In this paper, a non-contact real-time measurement method for the spatial electric field distribution of oil-paper insulation under impulse voltage is proposed, and the optical circuit system, optoelectronic conversion device and sealed cavity are constructed. The oil-paper insulating space electric field measuring device composed of shock power supply was calibrated and tested by using flat electrode. The electric field measurement curve and the actual electric field value curve were obtained at 17 ~ 47kV lightning impulse voltage. The correlation coefficient is used to describe the degree of agreement between them. The results show that the minimum measurable peak value is 3.49kV / mm and the maximum error is less than 3.56.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);中国电力科学研究院;
【基金】：国家自然科学基金项目(51477052) 国家电网公司科技项目(GYB17201500159)~~
【分类号】：TM855

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