期刊论文

Stator Single Phase Ground Fault Protection of Powerformers Based on Grading Insulation

Wang, Y.

中文

中国电机工程学报

0258-8013

2018

38

23

7052-7060

10.13334/j.0258-8013.pcsee.180189

51777014:国家自然科学基金 51737002:国家自然科学基金 2017YFB0902903:国家重点研发计划 2018GK2057:湖南省重点研发计划项目

本校为第一且通讯机构

为改善高压发电机定子单相接地故障保护的灵敏度和可靠性,提出一种基于分级绝缘的高压发电机定子单相接地保护方案。考虑高压发电机定子绕组采用分级绝缘技术,定量计算了高压发电机齿部各位置的齿宽分布情况,分析了定子绕组在不同齿部尺寸下的磁密分布特性,精确给出了每相每分支匝电动势与定子绕组对地分布电容的数学描述。为消除输电系统三次谐波电压波动对保护方案的干扰,保护方案增加了自适应门槛保护判据。仿真结果表明,该方案在改善保护灵敏度与可靠性方面具有明显优势。

To improve the sensitivity and reliability of Powerformer stator single-phase ground fault protection, a scheme of stator single-phase grounding protection for Powerformers based on hierarchical insulation was proposed. In this paper, the stator winding of powerformer stator insulation using hierarchical technology to calculate the tooth width distribution of powerformer gear teeth at various locations, the magnetic density distribution characteristics in different tooth size of stator windings were analyzed, and a mathematical description of the electromotive force per branch and the distribu...