电力系统自动化Issue(10)：163-167,5.DOI:10.7500/AEPS20141130028
变压器自适应相间后备保护
Adaptive Phase-to-phase Backup Protection of Transformer
李晋民 1王振科1
作者信息
- 1. 山西大学电力工程系，山西省太原市 030013
- 折叠
摘要
Abstract
The high voltage side overcurrent protection in step-down transformers is not able to ensure the sensitivity of internal fault on the lower voltage side.Consequently,it is unable to meet the requirement as the local backup protection of transformer internal phase-to-phase short circuit.Similarly,the lower voltage side overcurrent protection has the same problem as the remote backup protection of the adjacent element.Based on an analysis of the characteristics of adaptive protection and the backup protection arrangement of transformer,a transformer adaptive overcurrent protection scheme is put forward,which can identify the operating mode of system as well as fault types on line should fault occur and calculate the settings of backup protection in real-time automatically.It not only guarantees correct operation under transformer rated load,but also ensures the sensitivity as local back-up protection and remote back-up protection in an internal or external fault situation.The superiority and feasibility of the scheme are proved by examples.关键词
变压器保护/相间后备保护/过流保护/灵敏度Key words
transformer protection/phase-to-phase backup protection/overcurrent protection/sensitivity引用本文复制引用
李晋民,王振科..变压器自适应相间后备保护[J].电力系统自动化,2015,(10):163-167,5.
