中文摘要：

现有限流熔断器中的高速开断器通常采用炸药爆炸产生的冲击力驱动进行分断，炸药在实际应用中存在易分解、不耐高温和安全性低等缺陷。该文针对炸药型开断器存在的问题，设计了一种采用电磁斥力机构和绝缘窄缝灭弧室的新型开断器，并基于该开断器提出了一种电弧触发器外置的混合型限流熔断器方案。开展了额定直流640V／2kA限流熔断器设计，进行了新型开断器的分断测速试验和介质恢复试验及其高速摄像。试验表明，电磁斥力机构驱动的绝缘栅片可在200gs内将银片顶断起弧换流，且通过加装绝缘窄缝灭弧室，开断器电弧在灭弧室中受到绝缘器壁的冷却而快速熄灭，在燃弧能量为8．2J的情况下，经过180Its的介质恢复时间，能够承受1．5kV电压，其介质恢复强度要明显好于没有灭弧室的情况。为了进一步减小开断器上的燃弧能量以提高其介质恢复强度，该文又提出了一种电弧触发器内置的改进混合型限流熔断器方案，开展了该方案的介质恢复试验和温升试验，结果表明开断器所需的介质恢复时间得到进一步缩短，可在100Its的介质恢复时间后承受1．5kV电压，该方案的介质恢复特性和温升特性可以较好的满足实际系统要求。

英文摘要：

The high speed isolator of existing current limiting fuse （CLF） mostly utilizes the explosive force to interrupt current, however, the explosive has some disadvantages in use, such as easily decompose, poor heat-resistant, insecurity and more cost. According to the above disadvantages of explosive isolator, a novel isolator based on electro-magnetic repulsion mechanism and arc extinction chamber with narrow gaps was designed. A novel hybrid CLF with arc-trigger outside using the isolator was introduced. A 640V/2kA DC CLF prototype was designed and the velocity measuring test and dielectric recovery test of isolator were carried out with fast speed video camera. The test results and videos show that the isolator is able to separate within 200 txs and the arc is extinguished quickly in the arc extinction chamber with narrow gaps. The dielectric recovery strength of isolator with arc extinction chamber reaches 1.5 kV after arc energy of 8.2 J and dielectric recovery time of 180 las is better than without arc extinction chamber. In order to reduce the arc energy of isolator further and improve the dielectric recovery strength, a novel improved hybrid CLF with arc-trigger inside was introduced. The dielectric recovery test and temperature rise test were carried out and the test results show that the dielectric recovery time of isolator is reduced and the isolator can suffer 1.5 kV after dielectric recovery time of 100 ~ts. The dielectric recovery characteristic and temperature rise characteristic can meet the demand of practical power system.