组合型接地方式对注入式定子接地保护的影响

doi:10.11930/j.issn.1004-9649.201805084

中国电力 ›› 2018, Vol. 51 ›› Issue (11): 96-103.DOI: 10.11930/j.issn.1004-9649.201805084

组合型接地方式对注入式定子接地保护的影响

张琦雪¹, 王祥珩², 陈佳胜¹, 徐天乐¹, 李华忠¹, 王光¹, 陈俊¹

1. 南京南瑞继保电气有限公司, 江苏南京 211102;
2. 清华大学电机工程与应用电子技术系, 北京 100084

收稿日期:2018-05-15 修回日期:2018-09-27 出版日期:2018-11-05 发布日期:2018-11-16
作者简介:张琦雪(1974-),男,博士,高级工程师(研究员级),从事电厂继电保护及自动化装置研发工作,E-mail:zhangqx@nrec.com;王祥珩(1940-),男,博士,教授,博士生导师,从事电机分析和控制、电机故障及保护、电气传动及其自动化等研究,E-mail:wangxiangheng@tsinghua.edu.cn

Influence of the Combination-Type Grounding Scheme on Voltage-Injected Stator Ground Fault Protection

ZHANG Qixue¹, WANG Xiangheng², CHEN Jiasheng¹, XU Tianle¹, LI Huazhong¹, WANG Guang¹, CHEN Jun¹

1. NR Electric Co., Ltd., Nanjing 211102, China;
2. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Received:2018-05-15 Revised:2018-09-27 Online:2018-11-05 Published:2018-11-16

摘要/Abstract

摘要： 借鉴谐振接地的优点，采用在大型发电机的配电变压器低压侧负载电阻两端并联电感的组合型接地方式，减少接地故障电流。使用Matlab Simulink 工具搭建仿真模型，采用准分布电容参数模型模拟定子接地故障，使用与保护装置相同的算法计算注入式定子接地保护。设计一种常规高阻接地和3种组合型接地的方案，对白鹤滩水电站发电机的实例进行仿真计算，通过对比分析，研究组合型接地方式对注入式定子接地保护的影响。结果表明，增加并联电感会恶化接地过渡电阻的计算结果；将并联电感放到接地变压器高压侧，对注入式定子接地保护最有利，但是该方案增加了设备成本；在并联电感有限的补偿电流范围内，失谐度越大，越有利于接地过渡电阻的测量。

关键词: 大型发电机, 单相接地故障, 高阻接地, 谐振接地, 定子接地保护, 注入式

Abstract: By drawing upon the advantages of the resonant grounding method, a combination-type grounding scheme is adopted for large-sized generator to reduce the ground fault current, in which the inductor is installed in parallel with the load resistor on the LV-side of the neutral grounding transformer (NGT). In the paper, a numerical simulation model is established by using Matlab Simulink. The quasi-distributed capacitance model is used to simulate the stator ground fault protection, and the algorithm used for the protection devices is adopted to calculate the voltage-injected stator ground fault protection. A conventional high-resistance grounding scheme and three combination-type grounding schemes are designed, and simulations are carried out for the large-sized generator of Baihetan hydropower station in China. By comparing the simulation results, a study is made on the influence of the combination-type grounding scheme on the voltage-injected grounding protection. The results show that adding parallel inductor will worsen the calculation results of the ground fault resistance; the parallel inductor installed on the high voltage side of the NGT is most favorable to the voltage-injected stator ground fault protection, but the equipment cost will be increased; within the limited amount of compensation current by the parallel inductor, the greater the degree of detuning is, the better the measurement of the ground fault resistance is.

Key words: large-sized generator, single-phase-to-ground fault, high-resistance ground, resonant ground, stator ground fault protection, voltage-injected

中图分类号:

TM772

张琦雪, 王祥珩, 陈佳胜, 徐天乐, 李华忠, 王光, 陈俊. 组合型接地方式对注入式定子接地保护的影响[J]. 中国电力, 2018, 51(11): 96-103.

ZHANG Qixue, WANG Xiangheng, CHEN Jiasheng, XU Tianle, LI Huazhong, WANG Guang, CHEN Jun. Influence of the Combination-Type Grounding Scheme on Voltage-Injected Stator Ground Fault Protection[J]. Electric Power, 2018, 51(11): 96-103.

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组合型接地方式对注入式定子接地保护的影响

Influence of the Combination-Type Grounding Scheme on Voltage-Injected Stator Ground Fault Protection

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组合型接地方式对注入式定子接地保护的影响

Influence of the Combination-Type Grounding Scheme on Voltage-Injected Stator Ground Fault Protection

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