摘要
中压配电线路分级保护配置无统一标准,亟待寻找量化评价方法对各种分级保护方案进行准确评价,以寻求最优配置方案。基于现有标准和规范介绍了配电线路分级保护的一般整定原则,根据变电站出线保护可整定的最长动作时间制定分级保护典型配置方案,计及分级保护延时跳闸导致的电压骤降与主变损害影响,从长时停电、短时停电、电压骤降影响以及主变损害程度4个方面定义了分级保护方案的评价指标,并兼顾供电可靠性与经济性构建了分级保护方案综合评价模型。以某典型中压配电线路为例,对国内常见的分级保护方案进行综合评价,根据评价结果得到与地区网架结构相适应的最优分级保护方案,验证了评价方法的有效性。
Due to the lack of unified standards for the hierarchical protection configuration of medium voltage distribution lines,it is urgent to find a quantitative evaluation method to evaluate various hierarchical protection schemes accurately in order to find the optimal allocation scheme.Firstly,the general setting principles of hierarchical protection for distribution lines are introduced based on existing standards and specifications,and the typical configuration scenarios for hierarchical protection are developed according to the maximum action time that can be tuned for outgoing protection of substation.Secondly,taking into account the impact of voltage collapse and main transformer dam-age caused by delayed tripping of hierarchical protection,the evaluation indexes of the hierarchical protection are defined from four aspects:long-term power outage,short-term power outage,voltage collapse,and main transformer damage,on this basis,the comprehensive evalua-tion model combining power supply reliability and economy is constructed.Taking a typical medium-voltage distribution line as an example,a comprehensive evaluation of the common hierarchical protection schemes in China is carried out,and the optimal hierarchical protection scheme suitable for the regional grid structure is obtained according to the evaluation results,and the effectiveness of the evaluation method is verified.
作者
王标
涂佳铭
王嘉豪
WANG Biao;TU Jia-ming;WANG Jia-hao(Kunshan Power Supply Company of State Grid Jiangsu Electric Power Co.,Ltd,Kunshan 215300,China)
出处
《电工电气》
2024年第1期27-32,70,共7页
Electrotechnics Electric
关键词
配电线路
分级保护
电压骤降
主变损害
评价指标
综合评价
distribution line
hierarchical protection
voltage collapse
main transformer damage
evaluation index
comprehensive evalu-ation
