Motion Law of Internal Space Charge in Oil-paper Insulation

YANG Zhifei; LIAO Yifan; DU Zhiye; WANG Guoli; HUANG Guodong; RUAN Jiangjun

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Motion Law of Internal Space Charge in Oil-paper Insulation

更新时间：2025-12-08

- Motion Law of Internal Space Charge in Oil-paper Insulation
- Vol. 44, Issue 6, Pages: 1828-1835(2018)
- 作者机构：
  
  1. 武汉大学电气工程学院
  2. 南方电网科学研究院有限责任公司
  3. 华南理工大学电力学院
  4. 广东电网有限责任公司电力调度控制中心
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 July 2018，
  
  Published：2018
- 稿件说明：
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YANG Zhifei, LIAO Yifan, DU Zhiye, et al. Motion Law of Internal Space Charge in Oil-paper Insulation[J]. 2018, 44(6): 1828-1835.
DOI：

YANG Zhifei, LIAO Yifan, DU Zhiye, et al. Motion Law of Internal Space Charge in Oil-paper Insulation[J]. 2018, 44(6): 1828-1835. DOI：

摘要

针对换流变压器油–纸绝缘内部合成电场的计算

目前尚无有效的方法考虑空间电荷对合成电场的附加影响

致使内绝缘设计误差较大。为此对现有的上流有限元法进行改进

添加时间步长

基于迭代思想

提出瞬态上流元法

在考虑空间电荷运动的情况下

计算油–纸绝缘内部合成电场。单层油纸绝缘实验结果与仿真结果的对比验证了该方法的正确性。研究了不同电场强度下

油–纸绝缘介质内部空间电荷的运动规律和合成电场的畸变情况

并利用该方法进一步研究了双层油–纸绝缘系统内部空间电荷的分布规律。研究结果表明:瞬态上流元法具有较高的精确度;在载流子迁移率一定的情况下

初始电场强度越大

电荷运动到动态稳定所需时间越短

且内部合成电场畸变率越大;双层油–纸交界面对空间电荷具有阻碍效应

可通过设置适当的界面势垒模拟这一特性。该方法的提出为提高特高压直流设备的内绝缘优化设计水平提供了理论与技术支撑。

Abstract

No effective method can be adopted to consider the influence of space charges when calculating the total electric field distribution in the main insulation system of the valve-side winding of converter transformer. In order to calculate total electric field in oil-paper insulation system

we put forward a new simulation method in oil-paper insulation based on a transient upstream finite element method（TUFEM）

in which the time variable is considered. The TUFEM is used to calculate the total electric field in oil-paper insulation system by considering motion law of space charges. The simulation method is verified by comparing the simulation results to the test data in references. The motion law of space charges and distribution characteristics of the electric field under difference voltage values in single-layer oil-paper insulation is obtained. The distribution of space charge in a double-layer oil paper insulation system is further studied by this method. The results show that the TUFEM has an excellent accuracy compared with test data in references. When carrier mobility is a constant

the higher the initial electric field intensity is

the less time the space charge reaching dynamic stability will take

and the greater distortion rate of internal total electric field will be. Space charges are hindered on the interface of double layers of oil-paper insulation

which can be simulated by setting an appropriate interface potential barrier.This method will promote the design and optimization level of UHVDC converter transformers.

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