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| The State of the Art of Combustion Behavior of Live Wires and Cables |
| ZHANG Jiaqing1,2,3, ZHANG Bosi2,3,4, WANG Liufang1,2,3, FAN Minghao1,2,3, XIE Hui1,2,3, LI Wei1,2,3
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1 State Grid Anhui Electric Power Research Institute, Hefei 230601;
2 State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities, Hefei 230022;
3 Anhui Province Key Laboratory of Electric Fire and Safety Protection, Hefei 230022;
4 Department of Safety Engineering, China Institute of Industrial Relations, Beijing 100048; |
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Abstract The state of art on combustion characteristics of live wires and cables are elaborated in this article. The main focus was put on the temperature rise characterictics of inservice wires and cables, the failure-induced fire of live wires and cables, and the mutual influence between current variable and combustion characteristics, which correspond to the nature, ignition characteristic and flame spread characteristic of wires and cables, respectively. In the section of temperature rise characteristics of inservice wires and cables, the prediction models on core temperature based upon thermal circuit and numerical computational models, as well as the core temperature monitoring systems of cables, are presented. In the section of failure induced fire of live wires and cables, two essential failures are discussed. The arc fault due to conductive path formed in the insulating layer and ionized air under external heat is analyzed first. Except for the arc fault, core overheating is another failure that could induce electric fires, which is mainly caused by short circuit, over load and poor connection. The combining effects among different electric faults are also considered. In the section of mutual infulence between current variable and combustion characteristics, we discuss the relationship between electric field and combustion characteristics, and reveal the influences of current variable on combustion and flame spread characteristics of wires and cables under external ignition source.It can be suggested that the influence of current variable on live wire and cable fire should be taken into account when enact the electric safety standards.
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Published: 04 May 2018
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2017, Vol. 31 
