Research on early warning of mining high voltage cable internal-caused fire based on thermal circuit
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摘要: 线芯的异常温升是矿用电缆内因火灾的极早期特征,及时准确地获取电缆线芯温度是电缆内因火灾预警技术的关键。本文提出了一种通过电缆外护套表面温度推算线芯温度的热路模型算法。该算法依据电缆外护套表面温度、电流、结构参数对电缆线芯导体的温度进行推算。其中,稳态热路模型算法用于电缆正常工作且电流稳定时的温度计算,暂态热路模型算法用于电缆故障时的温度计算。通过矿用电缆内因火灾实验,分析了模型的计算误差,验证了模型算法可行性。结果表明,热路模型算法的计算值与实验值吻合度较高,相对误差小于10 %,可作为矿用电缆内因火灾预警的判据。Abstract: The abnormal increase in the temperature of the cable core is an extremely early phenomenon observed during a mining cable internal-caused fire; therefore, the cable internal-caused fire warning system relies on the prompt and accurate measurement of the cable core temperature. The paper proposed a thermal circuit model to calculate the core temperature from the surface temperature of the outer sheath of the cable. The steady-state thermal circuit model is suitable for calculating the temperature when the cable is working normally and the current is stable, whereas the transient thermal circuit model is suitable for calculating the temperature when the cable is faulty. The calculation error of the model is analyzed through the internal-caused fire experiment of the mine cable, and the feasibility of the model algorithm is verified. The results show that the values obtained using the thermal circuit model are in good agreement with the experimental values, and the relative error is less than 10 %, which can be considered to be the criterion for providing early warning in case of a mining cable internal-caused fire.
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Key words:
- mining cable /
- internal-caused fire /
- thermal circuit model /
- fire warning
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表 1 实验装置主要部件
Table 1. The main components of experimental device
序号 名称及规格 型号 数量 单位 1 10 kVA全自动调压器 SDTY-10KVA 3 台 2 10 kVA大电流
变压器(1 000 A)SDDL-1000A 3 台 3 电流互感器1 000 A/5 BH-0.66 3 台 4 大电流测量模块 SDDL-1000A 3 块 5 功率因数补偿系统 SDBC-10KW 3 台 6 温度采集分析系统 RTD-8 16 路 表 2 导体温度计算值与实测值
Table 2. The calculated value and the measured value of conductor temperature
稳态电流/A 外护套表面温度/℃ 环境温度/℃ 实测线芯温度/℃ 计算线芯温度/℃ 误差/% 100 28.8 22.6 33.9 35.2 3.8 表 3 暂态热路模型在各个负载电流下的计算误差
Table 3. Calculation error of transient thermal circuit model under various load currents
负载电流值/A 平均误差 相对误差/% 绝对误差/℃ 100 -0.74 -2.52 200 -2.77 -5.70 320 -7.33 -7.06 -
[1] 卢建. 煤矿用电缆火灾致因及其防范[J]. 煤矿安全, 2016, 47(5): 248-250. https://www.cnki.com.cn/Article/CJFDTOTAL-MKAQ201605066.htmLu Jian. Causes of coal mine cable fire and its prevention[J]. Safety in Coal Mines, 2016, 47(5): 248-250. https://www.cnki.com.cn/Article/CJFDTOTAL-MKAQ201605066.htm [2] 陈杰. 对煤矿用电缆火灾事故的思考[J]. 煤矿安全, 2011, 42(2): 133-134. https://www.cnki.com.cn/Article/CJFDTOTAL-MKAQ201102046.htmChen Jie. Consideration on fire accident of cable used in coal mine[J]. Safety in Coal Mines, 2011, 42(2): 133-134. https://www.cnki.com.cn/Article/CJFDTOTAL-MKAQ201102046.htm [3] 袁亮. 煤矿典型动力灾害风险判识及监控预警技术"十三五"研究进展[J]. 矿业科学学报, 2021, 6(1): 1-8. doi: 10.19606/j.cnki.jmst.2021.01.001Yuan Liang. Risk identification, monitoring and early warning of typical coal mine dynamic disasters during the 13th Five-Year Plan period[J]. Journal of Mining Science and Technology, 2021, 6 (1): 1-8. doi: 10.19606/j.cnki.jmst.2021.01.001 [4] 孟远, 谢东海, 苏波, 等. 2010年—2019年全国煤矿生产安全事故统计与现状分析[J]. 矿业工程研究, 2020, 35(4): 27-33. https://www.cnki.com.cn/Article/CJFDTOTAL-KTGC202004005.htmMeng Yuan, Xie Donghai, Su Bo, et al. Statistics and analysis of coal mine production safety accidents in China from 2010 to 2019[J]. Mineral Engineering Research, 2020, 35(4): 27-33. https://www.cnki.com.cn/Article/CJFDTOTAL-KTGC202004005.htm [5] 汪腾蛟, 周西华, 白刚, 等. 煤矿火灾诱发瓦斯爆炸危险性预测[J]. 煤炭学报, 2020, 45(12): 4104-4110. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB202012014.htmWang Tengjiao, Zhou Xihua, Bai Gang, et al. Hazard prediction of gas explosion induced by coal mine fire[J]. Journal of China Coal Society, 2020, 45(12): 4104-4110. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB202012014.htm [6] 王彦文, 赵永梅, 孙梦雅, 等. 一种矿井高压电缆绝缘监测新方法[J]. 矿业科学学报, 2017, 2(6): 582-587. http://kykxxb.cumtb.edu.cn/article/id/111Wang Yanwen, Zhao Yongmei, Sun Mengya, et al. A new method of high-voltage cable insulation monitoring in coal mine[J]. Journal of Mining Science and Technology, 2017, 2(6): 582-587. http://kykxxb.cumtb.edu.cn/article/id/111 [7] 赵建华, 袁宏永, 范维澄, 等. 基于表面温度场的电缆线芯温度在线诊断研究[J]. 中国电机工程学报, 1999(11): 53-55, 69. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC199911011.htmZhao Jianhua, Yuan Hongyong, Fan Weicheng, et al. On line diagnosis of cable core temperature based on surface temperature field[J]. Proceedings of the CSEE, 1999(11): 53-55, 69. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC199911011.htm [8] Liang K, Hao X F, An W G, et al. Study on cable fire spread and smoke temperature distribution in T-shaped utility tunnel[J]. Case Studies in Thermal Engineering, 2019, 14: 100433. doi: 10.1016/j.csite.2019.100433 [9] 桂小红, 游建平, 苏树君, 等. 通风换气对煤矿井下电缆巷火灾影响分析[J]. 矿业科学学报, 2021, 6(3): 348-355. doi: 10.19606/j.cnki.jmst.2021.03.012Gui Xiaohong, You Jianping, Su Shujun, et al. Analysis of the influence of ventilation on fire in underground cable roadway of coal mine[J]. Journal of Mining Science and Technology, 2021, 6(3): 348-355. doi: 10.19606/j.cnki.jmst.2021.03.012 [10] 柴丽芳. 浅议煤矿井下电缆火灾事故及预防对策[J]. 品牌: 理论月刊, 2011(S1): 157. https://www.cnki.com.cn/Article/CJFDTOTAL-PPLL2011Z1122.htmChai Lifang. Discussion on cable fire accident and preventive measures in coal mine[J]. Brand, 2011(S1): 157. https://www.cnki.com.cn/Article/CJFDTOTAL-PPLL2011Z1122.htm [11] 吕亮, 段成, 汲胜昌, 等.电线电缆引燃机理及燃烧特性研究综述[J/OL]. 高电压技术: 1-19[2021-03-29].https://doi.org/10.13336/j.1003-6520.hve.20201638.Lü Liang, Duan Cheng, Ji Shengchang, et al. Overview of ignition mechanism and combustion characteristic of wire and cable[J/OL]. High VoltageEngineering: 1-19[2021-03-29]. https://doi.org/10.13336/j.1003-6520.hve.20201638. [12] 刘洋, 陈杰, 李陈莹, 等. 膨胀型防火涂料对高压电力电缆引燃特性影响的实验研究[J]. 火灾科学, 2020, 29(4): 214-221. doi: 10.3969/j.issn.1004-5309.2020.04.03Liu Yang, Chen Jie, Li Chenying, et al. Experimental study on the influence of intumescent fire-resistant coating on ignition characteristics of high-voltage power cables[J]. Fire Safety Science, 2020, 29(4): 214-221. doi: 10.3969/j.issn.1004-5309.2020.04.03 [13] Korolchenko D, Eremina T, Tanklevsky L. Operation of cable lines under fire conditions[J]. E3S Web of Conferences, 2020, 221: 02007. doi: 10.1051/e3sconf/202022102007 [14] Huang X J, Zhu H, Peng L, et al. Thermal characteristics of vertically spreading cable fires in confined compartments[J]. Fire Technology, 2019, 55(5): 1849-1875. doi: 10.1007/s10694-019-00833-9 [15] Beji T, Verstockt S, Zavaleta P, et al. Flame spread monitoring and estimation of the heat release rate from a cable tray fire using video fire analysis (VFA)[J]. Fire Technology, 2016, 52(3): 611-621. doi: 10.1007/s10694-015-0538-2 [16] 张小翌, 王德明, 杨雪花. 煤矿硐室电缆火灾数值模拟[J]. 工矿自动化, 2019, 45(3): 52-55. https://www.cnki.com.cn/Article/CJFDTOTAL-MKZD201903010.htmZhang Xiaoyi, Wang Deming, Yang Xuehua. Numerical simulation of cable fire in coal mine chamber[J]. Industry and Mine Automation, 2019, 45(3): 52-55. https://www.cnki.com.cn/Article/CJFDTOTAL-MKZD201903010.htm [17] 郑建康, 刘素蓉, 蒲路, 等. 电力电缆带电燃烧的数值模拟技术研究进展[J]. 智慧电力, 2020, 48(10): 105-112. doi: 10.3969/j.issn.1673-7598.2020.10.017Zheng Jiankang, Liu Surong, Pu Lu, et al. State of the art of combustion behavior of live power cables[J]. Smart Power, 2020, 48(10): 105-112. doi: 10.3969/j.issn.1673-7598.2020.10.017 [18] 任慧, 孙继平, 刘晓阳. 矿用电缆火灾图像识别方法[J]. 辽宁工程技术大学学报, 2007, 26(1): 85-88. https://www.cnki.com.cn/Article/CJFDTOTAL-FXKY200701025.htmRen Hui, Sun Jiping, Liu Xiaoyang. Image recognition method of mine cable fires[J]. Journal of Liaoning Technical University, 2007, 26(1): 85-88. https://www.cnki.com.cn/Article/CJFDTOTAL-FXKY200701025.htm [19] 王海洋. 煤矿电缆火灾自动监控系统设计与实现[J]. 辽宁工程技术大学学报: 自然科学版, 2019, 38(1): 64-69. https://www.cnki.com.cn/Article/CJFDTOTAL-FXKY201901011.htmWang Haiyang. Design and implementation of automatic monitored control system for coal mine cable fire[J]. Journal of Liaoning Technical University: Natural Science, 2019, 38(1): 64-69. https://www.cnki.com.cn/Article/CJFDTOTAL-FXKY201901011.htm [20] Singh R S, Cobben S, Ćuk V. PMU-based cable temperature monitoring and thermal assessment for dynamic line rating[J]. IEEE Transactions on Power Delivery, 2021, 36(3): 1859-1868. doi: 10.1109/TPWRD.2020.3016717 [21] Miyagi D, Takata N, Takahashi N. Thermal analysis of co-axial multi-layered BSCCO HTS power cable[J]. IEEE Transactions on Applied Superconductivity, 2011, 21(3): 991-995. doi: 10.1109/TASC.2010.2090636 [22] 陶文铨. 数值传热学[M]. 2版. 西安: 西安交通大学出版社, 2001. [23] 牛海清, 周鑫, 王晓兵, 等. 外皮温度监测的单芯电缆暂态温度计算与试验[J]. 高电压技术, 2009, 35(9): 2138-2143. https://www.cnki.com.cn/Article/CJFDTOTAL-GDYJ200909018.htmNiu Haiqing, Zhou Xin, Wang Xiaobing, et al. Calculation and experiment of transient temperatures of single-core cables on jacket temperature monitoring[J]. High Voltage Engineering, 2009, 35(9): 2138-2143. https://www.cnki.com.cn/Article/CJFDTOTAL-GDYJ200909018.htm [24] Wang Y W, Zhang X R. Research on spontaneous cable fire early warning based on thermal circuit model with distribution parameters[J]. Dynamic Systems and Applications, 2020, 29(8): 2557-2570. [25] 李波, 张旭然, 薄春波. 电力电缆内因火灾早期特征的试验研究[J]. 消防科学与技术, 2019, 38(12): 1772-1776. doi: 10.3969/j.issn.1009-0029.2019.12.037Li Bo, Zhang Xuran, Bo Chunbo. Experimental study on early characteristics of internal cause of fire in power cable[J]. Fire Science and Technology, 2019, 38(12): 1772-1776. doi: 10.3969/j.issn.1009-0029.2019.12.037