![Radiation on surface pyrosim](https://knopkazmeya.com/22.png)
The output power of the arc power supply varies from 0 to 300 W. The arc power supply consists of two parts: the first-stage low-voltage conversion module and the second-stage high-voltage boost module. The arc discharge is driven by an ac power supply with voltage amplitude up to 20 kV and a frequency of 20 kHz. Figure 1 shows the experimental setup of the ignition of the power cable by Jacob’s ladder arc. In previous work, the equivalence between a Jacob’s ladder arc and the arc fault is analyzed, which shows that the Jacob’s ladder arc can serve as a fire source for the ignition of cable fire. When the grounding wire is stolen or the cable system is poorly grounded, high suspension voltage of several kilovolts on the metal sheath of the power cable is presented, which leads to the arc faults and therefore the possibility of cable fire.
#Radiation on surface pyrosim software
The electric characteristics and gas temperature of the arc discharge, the experimental ignition of cable fire, and the simulation of the ignition of the cable fire and flame propagation by Pyrosim software are presented in Section 3. The experimental setup of the 110 kV cable fire ignited by arc discharge is introduced in Section 2. A Jacob’s ladder arc is served as the fire source. Therefore, this study is aimed to investigate the effects of the size of the arc discharge on the ignition and flame propagation of the cable fire. Nevertheless, the previous works mainly focus on the development of a fire source for the ignition of power cable little attentions is paid to the effects of the parameters of arc discharge on the ignition of the cable fire and flame propagation. Experimental results show that as the fire source is applied to the outer sheath of the cable, a 110 kV cable fire can be successfully ignited and propagates forward a few minutes later. proposed a fire source based on Jacob’s ladder arc, which is used to simulate the arc discharge caused by the abnormal floating voltage of the cable sheath. However, the cable fire could not be ignited in their experiment. The simulated results show that the power cable could be ignited at 14.4 s after the start of the fire source. simulated the ignition of the 10 kV cable tunnel by arc discharge in a single-phase grounding fault. By use of FDS software, Liu Surong et al. An arc discharge is generated along with the knife scratch of the sheath of the cable, but the cable cannot be successfully ignited.
![radiation on surface pyrosim radiation on surface pyrosim](https://files.thunderheadeng.com/support/images/results-graph-radconv-top-left-conv-flux.png)
established a test platform for the ignition of cable fire by arc discharge.
![radiation on surface pyrosim radiation on surface pyrosim](https://klippel.net.cn/fileadmin/_processed_/0/3/csm_Sound_Radiation_1_660b61a9f1.png)
To understand the ignition of the cable fire by arc discharge, several research groups have made a great effort. This study deepens the understanding of the cable fire ignited by arc discharge and therefore it is useful for the evaluation and prevention of cable fire.
![radiation on surface pyrosim radiation on surface pyrosim](https://waikanaewatch.files.wordpress.com/2022/10/volcano-2.jpg)
Simulated results show that as the arc size increases, the cable fire is ignited faster, the flame propagates both vertically and horizontally increasing significantly, which is agreed well with the experimental results. In addition, a 3D model of the cable fire ignited by arc discharge is computed by Pyrosim software with fire dynamic simulation (FDS) module. However, the gas temperature of the arc decreases slightly from 2280 K to 2100 K. Therein, when the gap distance increases from 1.3 cm to 3.1 cm, the equivalent impedance and the length of the arc discharge increase nearly seven times and three times, respectively. It is interesting to find that the larger the arc size is, the faster the cable fire is ignited and propagates, and the larger the damaged area of the sheath of the cable is.
![radiation on surface pyrosim radiation on surface pyrosim](https://m.media-amazon.com/images/I/51Bt4GOXWgL._SL500_.jpg)
The arc size is changed by varying the gap distance of electrodes from 1.5 cm to 2.5 cm. In this work, with the constant electric power deposited into the arc discharge, the effects of arc size on the ignition and flame propagation of 110 kV XLPE cable fire are investigated for the first time. The ignition and flame propagation of cable fire dependent on the characteristics of the arc discharge is lackingin in-depth understanding at present. Cable fire caused by arc faults is one of the essential factors threatening the safe operation of a power system.
![Radiation on surface pyrosim](https://knopkazmeya.com/22.png)