摘要
[目的]直流电源系统中电缆截面通常按电缆长期允许载流量和回路允许电压降两个条件选择,但在实际工程中由于级差配合断路器额定电流可能会选的比较大,这时候就存在电缆过负荷或短路时断路器不动作烧坏电缆的情况。文章一方面通过工程实例说明这个问题,另一方面尝试找到电缆与断路器之间的简单关系式以方便工程设计。[方法]一方面通过实际算例简要介绍了电缆的选择、直流断路器配合的方法;另一方面通过数据拟合、曲线分析的方式,分析电缆与断路器的配合关系。[结果]得到一组电缆截面与断路器额定电流之间的工程实用关系式。[结论]电缆截面与断路器额定电流之间的工程实用关系式具有较广泛应用范围,为今后工程直流系统电缆设计提供借鉴。
[Introduction]In the DC power supply system,the cable section is usually selected according to the long-term allowable current-carrying capacity of the cable and the allowable voltage drop of the circuit.However,in actual projects,a larger rated current of the circuit breaker may be selected due to stage difference coordination.In this case,the circuit breaker will not act and will burn the cable when the cable is overloaded or short circuited.On one hand,this paper illustrates this problem with project examples.On the other hand,it tries to find a simple relation between cable and circuit breaker to facilitate engineering design.[Method]On one hand,the selection of cable and the coordination method of DC circuit breaker were briefly introduced through practical examples;On the other hand,the coordination between cable and circuit breaker was analyzed by means of data fitting and curve analysis.[Result]A set of engineering practical relations between cable section and rated current of circuit breaker are obtained.[Conclusion]The engineering practical relations between cable section and rated current of circuit breaker have a wide range of applications,providing reference for cable design of DC system in future projects.
作者
贾红舟
彭冠炎
刘艳华
JIA Hongzhou;PENG Guanyan;LIU Yanhua(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China)
出处
《南方能源建设》
2022年第S02期74-78,共5页
Southern Energy Construction
基金
中国能建广东院科技项目“物联网在智能电网的应用研究与工程示范”(ER05321W)
关键词
电缆与断路器配合
电缆截面选择
直流系统
直流电缆
直流断路器
coordination between cable and circuit breaker
selection of cable section
DC system
DC cable
DC circuit breaker
