摘要
为解决电弧触发式混合限流熔断器在大电流场合下的应用问题,针对其关键技术开展了深入研究,重点对电弧触发器进行了优化设计。通过建立电弧触发器的热电耦合模型,分析了熔体结构尺寸对其温升和弧前特性的影响,旨在提高其熔体的载流密度,在满足温升要求的前提下缩短其熔断时间,提高故障检测速度。研制了2000 A/640 V工程样机,额定通流功耗144 W。在预期电流峰值100 kA、时间常数4.17 ms的短路试验中,电弧触发器在短路后700μs熔断起弧,整机弧前时间1.1 ms,全分断时间仅为1.85 ms,短路电流峰值19 kA,弧前焦尔积分值仅为同规格快速熔断器的1/28。
are deeply temperature For the studied high-current applications of arc-triggering hybrid and the design of arc-trigger is optimized. rise,the effect of physical dimension of fuse current-limiting fuse, the key technologies To shorten its fusing time with allowed on the temperature rise and pre-arcing characteristics is analyzed with its thermoelectric coupling model. A 2 000 A/640 V prototype is developed and its rated power is 144 W. The results of short-circuit test with prospective peak current 100 kA and time constant 4.17 ms show that,the are trigger burns out in 700 p,s after short-circuit fault,the pre-arcing time is 1.1 ms,the clear time is 1.85 ms,the fault current is limited to 19kA,and the melting joule integral is only 1/28 of the rapid fuse with same specifications.
出处
《电力自动化设备》
EI
CSCD
北大核心
2011年第10期81-85,共5页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(50877078)~~
关键词
大电流
混合限流熔断器
电弧触发
热电耦合模型
耦合
模型
熔断器
设计
high current
hybrid current-limiting fuse
arc-triggering
thermoelectric coupling model
couplings
models
electric fuses
design
