摘要
针对目前配电箱内断路器在火灾热影响下,由于脱扣机构动作引起跳闸,不能保证消防设备持续供电的问题,利用传热学理论,对实际建筑中广泛使用的低压配电箱在火灾条件下的传热过程进行了分析,采取加装隔热板的办法降低箱内温度,在一定程度上保护了内部电路,并依据双金属片热弯曲理论,推导出了热脱扣机构动作力与端部位移成正比的关系.得出了消防终端设备供电装置应该采取隔热保护措施,需增加消防负载供电时间的结论,并且对断路器进行技术改进.
Since circuit breaker in the fire distribution box can not guarantee power supply problems, because of the tripping caused by thermal tripping framework＇ s movement under the fire thermal effect, the paper uses heat transfer theory to analyse the heat transfer process of the low-voltage distribution box widely used in the actual construction on fire condition, and install thermal insulation panel to decrease temperature in box, in order to protect internal circuit at a certain extent. And based on thermal bimetallic bending theory the research deduces the relationship between the movement of thermal tripping framework and the end displacement is proportional. It can conclude that fire terminal power supply device should take heat insulation protection measures and improve circuit breaker with technological methods to increase the supply time of fire power load.
出处
《哈尔滨理工大学学报》
CAS
北大核心
2009年第4期64-66,70,共4页
Journal of Harbin University of Science and Technology
关键词
配电箱
火灾
消防负载
断路器
脱扣机构
fire distribution box
fire environment
fire power load
circuit breaker
thermal tripping framework
