In high temperature environment, safe operation of insulated and sheathed cables needs to be guaranteed from multiple aspects.
1. Material selection
For insulating materials, high temperature resistant materials such as cross-linked polyethylene (XLPE) can be selected under high temperature environment. XLPE has better heat resistance than ordinary polyethylene and can withstand higher temperatures. Its molecular structure is more stable at high temperatures and can effectively prevent the degradation of insulation performance. In terms of sheath materials, silicone rubber is a good choice. It can work normally in a wide temperature range of -60℃ to 200℃, and can still maintain good flexibility and physical properties at high temperatures, which plays a good protective role for the internal structure of the cable.
2. Cable heat dissipation design
In high temperature environment, cable heat dissipation becomes particularly critical. On the one hand, heat dissipation can be promoted by increasing the surface area of the cable, such as using a flat cable structure. Compared with round cables, flat cables have a larger surface area under the same cross-sectional area, which is conducive to heat dissipation. On the other hand, reasonable laying methods can also help heat dissipation, such as laying cables overhead to avoid direct contact between cables and high-temperature ground or other high-temperature objects, and maintaining appropriate spacing between cables to avoid heat accumulation.
3. Overload protection of cables
High temperature will reduce the current carrying capacity of cables, so it is necessary to accurately calculate the current carrying capacity of cables in high temperature environments and set up appropriate overload protection devices. For example, install protective devices such as thermal relays. When the cable current exceeds the safety value and the temperature rises to a certain level, the thermal relay can cut off the circuit in time to prevent the cable from being damaged due to overheating.
4. Real-time monitoring of cables
By installing monitoring equipment such as temperature sensors on the cables, the temperature of the cables can be monitored in real time. Once the temperature rises abnormally, the problem can be discovered in time and corresponding measures can be taken, such as checking whether the cable has local overheating, insulation damage, etc., to ensure the safe operation of the cable in high temperature environments.
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