变压器间及其与电流互感器暂态交互作用分析和保护对策  

Multiple transformers and CTs interactive effect and its impact on the protective relay

作　　者：尹项根[1] 张哲[1] 王友怀 刘勇 戚宣威[1] 曹文斌[1] 郭乾[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北武汉430074 [2]湖北省电力调度控制中心,湖北武汉430077

出　　处：《电力系统保护与控制》2016年第23期1-9,共9页Power System Protection and Control

基　　金：国家重点研发计划智能电网与装备重点专项(2016YFB0900600);国家自然科学基金项目(51277084)~~

摘　　要：交直流混联复杂电网发生扰动和故障期间,变压器之间及其与电流互感器之间将发生暂态交互作用,这一复杂暂态过程,增加了故障判断的难度,影响到继电保护正确动作。近年来,电网发生不少由于变压器空投导致相邻变压器、发电机和输电线路保护误动的事故,威胁电网安全运行。从原理分析、数字仿真以及动模试验等多个层面围绕变压器励磁涌流、和应涌流以及互感器暂态饱和开展研究,论述变压器之间及其与电流互感器暂态交互作用机理,分析电磁暂态对保护的影响,提出保护的应对措施。并讨论了一种多场景仿真平台,可用于电流互感器选型和事故分析。When disturbance or fault occurs to AC/DC hybrid power system, the transformer and current transformer （CT） will produce complex transient interactive process, which makes it difficult for relay protection to identify faults and operate correctly. In recent years, there are many unusual real-operations of the differential protection for transformer, generator and transmission line already in operation caused by the adjacent switching-on transformer, which have seriously threaten the safe and stable operation of the power grid. The transformer inrush current, sympathetic current and CT transient saturation are researched based on mechanism analysis, digital simulation and dynamic test. The mechanism of transformers and CT transient interactive process is discovered and relevant countermeasure is proposed. A simulation platform is also built to help to select the types of CT and analyze accident.

关 键 词：变压器 电流互感器 励磁涌流 和应涌流 暂态饱和 差动保护 

分 类 号：TM721.3[电气工程—电力系统及自动化] TM41TM452