高电压技术2018，Vol.44Issue(2)：366-371,6.DOI:10.13336/j.1003-6520.hve.20180131004
石英砂熔断器的弧前时间-电流特性
Pre-arcing Time and Current Characteristics of Quartz Sand Fuse
摘要
Abstract
Quartz sand fuse is widely used in power system as a protection.The pre-arcing time-current characteristic is one of the important performance indexes for the fuse.We put forward an efficient simulation method,which is able to accurately simulate pre-arcing characteristics of quartz sand fuse.The research reveals the factors influencing the pre-arcing characteristics,and it is helpful to understand its physical process.A coupled thermal-electric model of the pre-arcing period of quartz sand fuse is used to simulate the heating process of fuse element by ANSYS with an enthalpy changes formulation.Experiments on fuses of two shapes of notches are carried out under different prospective currents to validate the simulations.The results show that the current density of the notch is the largest,and the temperature increases most rapidly.The temperature of the fuse-element increases non-linearly with time because the electrical resistivity,thermal conductivity,density and enthalpy vary with temperature and there are slow growth stages during two phase transformation.Pre-arcing time tends to decrease as the prospective current increases when the current is between 300 A and 3 500 A,and the value of truncated current verify the current-limiting characteristics of quartz sand fuse.The error between simulation and experiment of pre-arcing time-current characteristic for two kinds of fuse-elements is less than 5％,which can prove the validity and applicability of the simulation model and the method.关键词
石英砂熔断器/熔体/弧前时间-电流特性/焓变/热电耦合/限流Key words
quartz sand fuse/fuse-element/pre-arcing time-current characteristics/enthalpy changes/coupled thermal-electric/current limiting引用本文复制引用
刘志远,王彤,孙超,闫静,王姣,耿英三..石英砂熔断器的弧前时间-电流特性[J].高电压技术,2018,44(2):366-371,6.基金项目
国家重点基础研究发展计划(973计划)(2015CB251002) （973计划）
国家自然科学基金(51677141).Project supported by National Key Basic Research Program of China (973 Program) (2015CB251002),National Natural Science Foundation of China (51677141). （51677141）
