直流滤波电容器内部熔丝的过流能力验证及对保护的影响  

Verification of Overcurrent Capability of Internal Fuses of DC Filter Capacitor and Influence on Protection

作　　者：颜红岳 吴洪林 YAN Hongyue;WU Honglin(Nissin Electric(Wuxi)Co.,Ltd.,Jiangshu Wuxi 214112,China)

机构地区：[1]日新电机(无锡)有限公司,江苏无锡214112

出　　处：《电力电容器与无功补偿》2023年第5期33-37,共5页Power Capacitor & Reactive Power Compensation

摘　　要：文中针对换流站的直流滤波电容器组C1保护整定计算方式“一定数量的串联段短路”这一要求,对内熔丝的通流能力进行试验,发现单元电容器在运行过程中故障串联段不一定会出现稳态的短路,当谐波电流较大时与击穿元件相串联的内熔丝会短时间内熔断。同时分析了单元电容器内单个串联段中的元件数损坏到一定数量后,理论上电容器组C1不平衡电流值也能达到按串联段短路时计算的整定值,但此时电容器存在开路的风险。In view of the requirement of short circuit of a certain number of series sections in the protection setting calculation method of DC filter capacitor bank C1 in converter station,the current carrying capacity of internal fuses is tested.It is found that the faulty series section of capacitor unit does not necessarily have steadystate short circuit during operation,When the harmonic current is large,the internal fuse connected in series with the breakdown element will fuse in a short time.At the same time,it is analyzed that after the number of elements in one series section in the capacitor unit is damaged to a certain number,the unbalanced current of capacitor bank C1 can theoretically also reach the setting value calculated in accordance with the short circuit of series section,however,the capacitor has the risk of open circuit at this time.

关 键 词：直流滤波电容器 内部熔丝 稳态过流能力 串联段 保护 

分 类 号：TM53[电气工程—电器] TM721.1