摘要
提出了一种基于纵联比较原理的变压器后备保护新方案。在现有保护的基础上,通过综合比较安装在变压器各侧测量元件的判断结果,能达到快速确定故障位置、隔离故障的目的。若判断为区内故障可实现快速跳闸;若为区外故障,能快速判断出故障所在侧,实现有选择性、动作延时配合简单的后备保护功能。该方案有效解决了变压器高压侧后备保护对中、低压侧故障灵敏度不高的问题,能缩小故障影响范围,缩短后备保护动作延时。考虑到在变压器不同运行方式下后备保护方案的通用性,选择基于故障分量的方向元件作为变压器各侧的测量元件。对各种故障情况进行了EMTDC(Electro-MagneticTransientinDCSystem)仿真计算,证明了该方案的可行性。
A new scheme for transformer backup protection based on longitudinal comparison principle is proposed. On the basis of existing backup protection, by means of comprehensively comparing the judgement results of the measuring elements installed at all sides of transformer, the faults can be rapidly located and isolated. If the fault were inside the protection zone, the fault could be fast tripped out; if the fault were outside the protection zone, the faulty side could be rapidly judged and a selective backup protection function with simple adaptation for action delay could be implemented. The proposed scheme effectively solves the problem that the transformer＇s backup protection at high voltage side is not sensitive to the faults occurred at the medium and low voltage side of transformer, therefore the impact range of the faults can be reduced and the time delay of backup protection action can also be reduced. Considering the versatility of backup protection under different operating modes of transformer, the directional relay based on fault components are selected as the measuring elements at all sides of the transformer. The EMTDC （Electro-Magnetic Transient in DC System） simulation results show that the proposed scheme is feasible.
出处
《电网技术》
EI
CSCD
北大核心
2005年第17期63-67,共5页
Power System Technology
关键词
变压器
纵联比较原理
后备保护
故障分量
方向继电器
电力系统
Transformer. Longitudinal comparison principle
Backup protection
Fault components
Directional relay
Power system
