摘要
探讨了电力变压器的远后备保护问题 ,特别是当变压器角接侧 (非电源侧 )发生两相故障且变压器保护失去直流电源的情况下变压器的远后备保护问题。通过相量图分析此时变压器高、低压侧故障电流的特点 ,进而提出一种远后备保护方案 。
This paper mainly discusses the remote backup protection of transformers, especially when the phase-to-phase fault occurs at the angle-connected side (non-power supply side) of transformers and the transformer protection loses its DC power supply. Through the phasor diagram analysis of the fault currents at both sides of transformer, a new remote backup protection scheme is proposed. The scheme completely solves the problem that the remote backup protection is not sensitive enough when phase-to-phase fault occurs at the angle-connected side of transformers.
出处
《电力系统自动化》
EI
CSCD
北大核心
2001年第17期45-46,共2页
Automation of Electric Power Systems
关键词
继电保护
远后备保护
电力变压器
电力系统
微机保护
Electric fault currents
Electric losses
Electric relays
Phase diagrams
Power supply circuits
