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| 单芯电缆热时间常数的理论计算与试验研究 | |
| 引用本文： | 张尧,周鑫,牛海清,王晓兵,汤毅,赵健康,樊友兵.单芯电缆热时间常数的理论计算与试验研究[J].高电压技术,2009,35(11):2801-2806. |
| 作者姓名： | 张尧 周鑫 牛海清 王晓兵 汤毅 赵健康 樊友兵 |
| 作者单位： | 1. 华南理工大学电力学院,广州,510640 2. 广东电网公司广州供电局,广州,510620 3. 国网电力科学研究院,武汉,430074 |
| 基金项目： | 国家重点基础研究发展计划(973计划)(2009CB724507); 广东电网公司重点科技进步项目(JA2006036)~~ |
| 摘 要： | 由于电缆热容的存在,当施加阶跃电流时,电缆温度随时间逐渐变化,经一段时间后达到热稳态,导体温度变化的速度一般用热时间常数来反映。为此,以单芯电缆为研究对象,介绍了电缆热时间常数;建立了电缆本体及周围介质的暂态热路模型并进行简化等效;计算了空气敷设和直埋敷设单芯电缆的热时间常数;并在试验现场进行了阶跃电流下的单芯电缆温升试验,通过对实测导体温度暂态过程的曲线拟合求得了电缆实际的热时间常数,验证了理论计算的正确性。电缆的热时间常数可用于估算阶跃电流作用下的导体暂态温度响应、以及到达最高允许温度所需要的升温时间,为电缆的运行状态监测及故障预警提供理论支持。 |
| 关 键 词： | 导体温度 热时间常数 单芯电缆 暂态热路模型 计算 试验 升温时间 |
Theoretical Calculation and Experimental Research on Thermal Time Constant of Single-core Cables |
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| ZHANG Yao , ZHOU Xin , NIU Hai-qing , WANG Xiao-bing , TANG Yi , ZHAO Jian-kang , FAN You-bing.Theoretical Calculation and Experimental Research on Thermal Time Constant of Single-core Cables[J].High Voltage Engineering,2009,35(11):2801-2806. | |
| Authors: | ZHANG Yao ZHOU Xin NIU Hai-qing WANG Xiao-bing TANG Yi ZHAO Jian-kang FAN You-bing |
| Affiliation: | ZHANG Yao1,ZHOU Xin1,NIU Hai-qing1,WANG Xiao-bing2,TANG Yi2,ZHAO Jian-kang3,FAN You-bing3(1.School of Electric Power,South China University of Technology,Guangzhou 510640,China,2.Guangzhou Power Bureau of Guangdong Power Grid Company,Guangzhou 510620,3.State Grid Electric Power Research Institute,Wuhan 430074,China) |
| Abstract: | Cable conductor temperature in operation is the key factor influencing insulation life,and cable operation state can be monitored through conductor temperature.Not only the value of temperature rise but also the change rate of conductor temperature is concerned.Generally the change rate of cable conductor temperature is represented by its thermal time constant.Consequently,the thermal time constant of single-core cable was introduced,transient thermal circuit models of cable body and its ambient medium were... |
| Keywords: | conductor temperature thermal time constant single-core cable transient thermal circuit model calculation test temperature rising time |
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