Fire Growth Rate Index as a Key Fire Characteristic of Electrical Cables

J. Martinka, P. Rantuch, Igor Wachter, Tomáš Štefko, M. Trčka, Martina Hladová, A. Nečas, Janka Sulová
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Abstract

Abstract This study deals with the Fire Growth Rate Index (FIGRA) as a key fire characteristic of electrical cables (determined by a cone calorimeter) that allows to estimate their reaction to fire class. Three power (supply) electrical cables (reaction to fire class B2ca) were tested by a cone calorimeter using different heat fluxes of 20, 30, 40 a 50 kW·m−2. The cables were three-wire (cross-section of each wire was 1.5 mm2) with a nominal voltage of 0.6 kV (alternating current), resp. 1 kV (direct current). The cable sheaths were made of an ethylene copolymer filled with aluminum hydroxide. The beddings were made of an ethylene copolymer filled with a mixture of aluminum hydroxide and calcium carbonate. The conductor insulations of one electrical cable were made of crosslinked polyethylene and the conductor insulations of the other two electrical cables were made of an ethylene copolymer filled with aluminum hydroxide. FIGRA was determined per unit length and unit area of electrical cables. FIGRA increased with increasing heat flux. At a heat flux of 50 kW·m−2, all the electric cables examined showed a very similar FIGRA (from 0.19 to 0.21 kW·m−1·s−1 and 18.4 to 21.2 kW·m−1·s−1, respectively). Conversely, at a heat flux of 20 kW·m−2, the investigated cables showed greater FIGRA variance (in the range of 0.11 to 0.16 kW·m−1·s−1 or 10.8 to 16.2 kW·m−1·s−1).
火灾增长率指标作为电缆火灾的关键特性
摘要:本研究将火灾增长率指数(FIGRA)作为电缆的关键火灾特性(由锥形量热计确定),用于估计电缆对火灾等级的反应。用锥形量热计测试了三根电源电缆(火灾反应等级B2ca),热流分别为20、30、40和50 kW·m−2。电缆为三线制(每根导线的横截面为1.5 mm2),标称电压为0.6 kV(交流电)。1kv(直流)。电缆护套由填充氢氧化铝的乙烯共聚物制成。衬垫由乙烯共聚物制成,填充了氢氧化铝和碳酸钙的混合物。其中一根电缆的导体绝缘层由交联聚乙烯制成,另外两根电缆的导体绝缘层由填充氢氧化铝的乙烯共聚物制成。FIGRA是按电缆的单位长度和单位面积计算的。FIGRA随热通量的增大而增大。在热流为50 kW·m−2时,所有电缆的FIGRA都非常相似(分别为0.19 ~ 0.21 kW·m−1·s−1和18.4 ~ 21.2 kW·m−1·s−1)。相反,当热流密度为20 kW·m−2时,所研究的电缆显示出更大的FIGRA方差(在0.11至0.16 kW·m−1·s−1或10.8至16.2 kW·m−1·s−1范围内)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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