中国电力2016，Vol.49Issue(7)：45-50,6.DOI:10.11930/j.issn.1004-9649.2016.07.045.06
大型发电机组中变压器后备保护存在问题分析及对策
Problems and Solutions of Backup Protection for Large Generator-Transformer Unit
张健康 1粟小华 1焦在滨2
作者信息
- 1. 国家电网西北电力调控分中心,陕西西安710048
- 2. 西安交通大学电气工程学院,陕西西安710049
- 折叠
摘要
Abstract
Compound voltage over-current and zero-sequence over-current protection are usually used as backup protection for phase and ground faults in generator-transformer unit.Since the boundary of protective zone of these two types of protection is difficult to delimit,it frequently leads to miscoordination with protection in grid side.In addition,it is difficult for protection in grid side to coordinate with the protection in power plant side.Both cases can give arise to misoperation of protection at faults.To meet the requirements of speed,selectivity and sensitivity,phase and ground impedance protection are introduced into generator-transformer unit.The setting principle for impedance protection proposed is discussed in detail and a calculation case is given taking a 750 kV power plant as an example.The scheme has been successfully applied to the large generator-transformer unit and its adjacent grid in Northwest China,which greatly improve coordination of backup protection in power plant side and grid side.关键词
发电机-变压器组/后备保护/阻抗保护/整定配合Key words
generator-transformer unit/backup protection/impedance protection/setting coordination分类
信息技术与安全科学引用本文复制引用
张健康,粟小华,焦在滨..大型发电机组中变压器后备保护存在问题分析及对策[J].中国电力,2016,49(7):45-50,6.
