核电站电力电缆芯温预测与内因火灾预警研究  

Research on core temperature prediction and internal-caused fire warning of power cables in nuclear power plants

作　　者：赵义文 ZHAO Yiwen(Fujian Ningde Nuclear Power Co.,Ltd.,Ningde Fujian 355200,China)

机构地区：[1]福建宁德核电有限公司,福建宁德355200

出　　处：《中国安全生产科学技术》2024年第4期129-135,共7页Journal of Safety Science and Technology

摘　　要：针对核电站中大量电力电缆集中敷设,电缆内部热量大量积聚,增加火灾风险的问题,提出利用线芯导体的异常温升这一极早期特征作为电缆内因火灾的预警方法。构建三芯电力电缆暂态热路模型,确立外护套表面温度与线芯温度之间的对应关系,开展内因火灾实验,积累研究所需的实验数据,提出基于Levenberg-Marquardt算法的电缆芯温反演计算方法。研究结果表明:将电缆外护套表面温度和电流数据作为输入参数,可实现电缆线芯温度的实时反演计算,能够解决电缆线芯因为包裹在护套内且具有极高的对地电压,导致其温度难以测量而不能以其温升指标作为电缆内因火灾预警依据的问题。研究结果可为预警电缆因电流过热导致的火灾提供参考。Aiming at the problem that a large number of power cables are laid centrally in nuclear power plants and there is a large accumulation of heat inside the cable,which increases the risk of fire,a warning method of internal-caused cable fire using the very early feature of abnormal temperature rise of the cable core conductor was proposed.A transient thermal circuit model of three-core power cable was established,and the corresponding relationship between the surface temperature of outer sheath and the temperature of cable core was determined.The internal-caused fire experiments were carried out to accumulate the experimental data required for research,and an inversion calculation method of cable core temperature based on the Levenberg-Marquardt algorithm were put forward.The results show that the real-time inversion calculation of the cable core temperature can be achieved by using the surface temperature of outer sheath and the cable current data as the input parameters,and it can solve the problem that the cable core is wrapped in the sheath and has a very high ground voltage,which makes it difficult to measure its temperature,and can not use its temperature rise index as the basis for internal-caused cable fire warning.The research results can provide reference for the early warning of cable fires caused by overheating current.

关 键 词：核电站 电缆内因火灾 电缆芯温 火灾预警 

分 类 号：X934[环境科学与工程—安全科学]