Effects of External Heat Radiation on Combustion and Toxic Gas Release of Flame Retardant Cables

Abstract:

The effects of external heat radiation on combustion and toxic gas release characteristics of flame retardant cables, which were XLPE insulated, flame retardant PVC sheathed and steel armoured cables, were investigated. The combustion characteristics of the level A and the level C flame retardant cables were explored by the cone calorimeter. For the level C cables, heat release rate (HRR) and CO concentration in cable fires increased and the ignition time decreased with increase of the external radiation heat flux. For level A cables, the HRR and CO concentration showed two-stage variations with the external radiation heat flux. When the external radiation heat flux was smaller than 35 kW/m², the cable self-extinguished quickly after the ignition. When the external radiation heat flux was larger than 50 kW/m², the cables showed continuous burning phenomena after the ignition. The level A cable had smaller HRRs compared with that of the level C cable under the same external radiation heat flux. However, the CO concentration of level A cable was remarkably higher than that of the level C cable in the present study. The high CO release rate of cable with well flame retardant ability under large external radiation heat flux requires more caution in the cable fires.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 2392-2398
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.2392
• Online since: June 2017
• Authors: Jia Qing Zhang*, Bo Si Zhang, Ming Hao Fan, Liu Fang Wang, Xiang Jun Guo, Deng Yang Yu
• Keywords: Cable, Flame Retardant, Heat Radiation, Heat Release, Toxic Gases

References

[1] J.Q. Zhang, M.H. Fan, W. Li, et al., Fire Safety of Cables in Power Grid: Tracking Combustion Test Standards of Cables and New Insights on Test Framework, CIGRE (International Council on Large Electric systems) 2016, B1-214.

[2] O. Fujita, T. Kyono, Y. Kido, et al., Ignition of electrical wire insulation with short-term excess electric current in microgravity, Proceedings of the Combustion Institute, 2011, 33: 2617-2623.

DOI: 10.1016/j.proci.2010.06.123

[3] M.K. Kim, S.H. Chung, O. Fujita, Effect of AC electric fields on flame spread over electrical wire. Proceedings of the Combustion Institute, 2011, 33: 1145-1151.

DOI: 10.1016/j.proci.2010.06.155

[4] J.Q. Zhang, M.H. Fan, X. F, Du, et al., Tracing and Analysis on Combustion Test Standards of Electrical Wires and Cables, Insulating Materials, 2015, 48(9): 6-11.

[5] H.J. Li, Estimation of thermal parameters and prediction of temperature rise in crane power cables, IEE Proceedings on Generation, Transmission and Distribution, 2004, 151(3): 355-360.

DOI: 10.1049/ip-gtd:20040376

[6] S.J. Grayson, P.V. Hees, A.M. Green et al., Assessing the fire performance of electric cables (FIPEC), Fire and Materials, 2001, 25(2): 49-60.

DOI: 10.1002/fam.756

[7] M.J. Niu, X.F. Li, J.Z. Chen et al., Study on the Flame Retardation and Smoke Emission of Flame Retarded Polyethyleneterephthalate with Cone, Polymer Materials Science and Engineering, 2002, 18(6): 202-204.

[8] W. Wang, H.P. Zhang and Y.T. Wan., A study on the burning behavior of PVC cables in the conic calorimeter test, Journal of Safety and Environment, 8(2): 117-120, (2008).

[9] A.S. Hansen and P.J. Hovde, Prediction of smoke production based on statistical analyses and mathematical modelling, Interflam 2001: 113-124.

[10] M.M. Hirschler, Electrical Cable Fire Hazard Assessment with the Cone Calorimeter, Fire Hazard and Fire Risk Assessment, STP1150, (1992).

DOI: 10.1520/stp23787s

[11] C.H. Lin Y.M. Ferng and B.S. Pei, Development of CFD fire models for deterministic analyses of the cable issues in the nuclear power plant, Nuclear Engineering and Design, 2008, 2: 338-345.

DOI: 10.1016/j.nucengdes.2008.09.010

[12] F.B. Clarke, H.V. Juijk, S. Steele, Predicting the Toxic Hazard of Cable Fires, Fire Hazard and Fire Risk Assessment, STP1082, (1990).

[13] G.X. Gong, J. Li and J.F. Ma, Investigation of the Toxicity of the Smoke Evolved during Burning of a Cable, Electric Wire & Cable, 2011, 2(2): 9-13.

[14] J.Q. Zhang, M. H. Fan, W. Li et al., Study on Combustion and Toxic Gas Release Characteristics of Flame Retardant Cables, Insulating Materials, 2016, 49(8): 72-77.

[15] Q. Fu. Study on Fire Performance of Typical Cables, University of Science and Technology of China, Hefei, (2012).