摘要
针对直流系统中复杂的级差配合问题,对直流系统保护电器的模型与级差配合算法进行了研究,设计了直流系统保护电器状态检测与维护决策系统。根据保护电器的安秒特性,在已有模型的基础上进行了简化与改进。根据某220kV变电站直流系统的接线方式、实测负荷电流情况、馈线的参数与保护电器的安秒特性,模拟了各种短路故障时的级差配合状况,找出了可能引起越级现象的原因,分析了保护电器选型的合理性。应用直流系统保护电器状态检测与维护决策系统对保护电器提出了合理的维护决策。提出的级差配合分析方法具通用性与良好的可操作性,对直流系统的设计与技改有指导意义。
Aiming at the complex stage difference coordination in DC system,the model of DC system protection device and the algorithm of stage difference coordination are analyzed,and the system of DC protection system state detection and maintenance decision is designed.At first,according to the ampere-second characteristics of protective devices,the model of the protective device is simplified and improved on the original basis.Secondly,according to the wiring diagram,measured load current,parameters of feeders and ampere-second characteristics of protective devices of one 220 kV transformer substation DC system,the stage difference coordination status when different kinds of short circuit occur is simulated,reasons for possible leapfrog are found,and the rationality of selection of protective devices is analyzed.Finally,reasonable maintenance decisions of protective devices are proposed by applying the system of DC system protective devices state detection and maintenance decision.The method proposed in this paper is unniversal and has a good operability,which can guide the design and technological improvement of DC system.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2011年第2期45-49,54,共6页
Power System Protection and Control
基金
高等学校博士学科点专项科研基金资助项目(200611012)
关键词
直流系统
保护电器
安秒特性
级差配合
DC system
protective device
ampere-second characteristic
stage difference coordination
