Behaviour of silicon ointment for power-cable insulation under external heating
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Behaviour of silicon ointment for power‑cable insulation under external heating Jiaqing Zhang1 · Bosi Zhang2 · Wenjie Li3 · Benhong Ouyang3 · Minghao Fan1 · Haoming Wang4 Received: 17 July 2019 / Accepted: 25 October 2019 © Akadémiai Kiadó, Budapest, Hungary 2019
Abstract The burning process and typical fire parameters of power-cable silicon ointment were explored experimentally using a cone calorimeter, and the effects of the external radiation heat flux (ERHF) and pool size were examined. The results showed that a shell with the appearance of numerous white convex particles was formed on the fuel surface soon after ignition and prevented the burning of the silicon ointment. These convex particles swelled with time, and the shell cracked under the influences of the ERHF and combustible gas release. The ERHF significantly affected the heat release rate (HRR) of the silicon ointment. Under low and high ERHFs, the HRR curve of the silicon ointment exhibited three and four stages, respectively. The peak HRR increased with the ERHF, and the influence of the pool size on the HRR of the silicon ointment was complex. The CO production rate of the silicon ointment increased continuously throughout the duration of the fire. The effect of the ERHF on the CO production rate was not significant. The CO production rate initially increased with the pool size but decreased when the pool size reached 9.5 cm. Keywords Silicon ointment · Burning process · Fire parameter · External heating · Cone calorimeter
Introduction Cables are widely used in electrical systems. If a cable fails in daily operation, fires may occur. Cable fire is the most common type of urban fire and has caused immeasurable losses. The joint of the cable is one of the most vulnerable parts of cable circuits. Cable failures, such as loose contact, poor heat dissipation, and short circuits, are prone to occur in cable joints. Therefore, the potential fire risk of cable joints is great. Silicon ointment is commonly used for insulating the cable joints in low-voltage circuits. Therefore,
* Jiaqing Zhang [email protected] * Bosi Zhang [email protected] 1
State Grid Anhui Electric Power Research Institute, Hefei 230601, China
2
Department of Safety Engineering, China University of Labor Relations, Beijing 100048, China
3
China Electric Power Research Institute, Wuhan 430074, China
4
State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
investigating the fire characteristics of silicon ointment is important for ensuring the fire safety of cables. As cable fires have caused great loss, they have attracted significant attention [1–3]. Some researchers focused on the fire parameters, including the heat release rate (HRR), the temperature rise, and the spread rate, and performed simulated experiments involving cable fires. Tarek et al. [4] introduced a method for determining the HRR of cable fires using the Video Fire Analysis technique and the flame detection algorithm. The obtained HRR profile showed good agreement with the HRR m
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