How to Ensure Reliable Cable Performance at –40°C and Below?
In polar regions, the phenomenon of the midnight sun provides months of continuous solar radiation, offering abundant renewable energy for research stations and remote installations.
However, the same environment presents an extreme challenge: sustained temperatures below –40°C, which put photovoltaic systems—and especially PV cables—to a severe test of survival.
Without dedicated countermeasures, conventional cables become as brittle as glass in such conditions, risking whole system failure.
The “Current-Carrying Crisis” in Extreme Cold
Under ultra-low temperatures, standard cables face three major risks:
• Insulation embrittlement
Common PVC or low-grade plastics harden rapidly below –30°C. Even slight wind-induced vibration can cause the insulation to crack like ice.
• Loss of flexibility
Cables become extremely stiff, making installation difficult and introducing internal mechanical stress that can lead to microscopic conductor damage.
• Escalating failure risks
Cracks in the insulation allow moisture and frost to penetrate, significantly increasing the risk of short circuits or even fire when the system is energised.
Slocable’s Cold-Resistant Engineering Solution
To ensure stable photovoltaic operation in the coldest regions in the world, Slocable has developed a high-performance low-temperature cable solution.
1. Material Innovation: XLPE with Anti-Freeze Plasticisers
Survival in polar conditions starts at the molecular level. Slocable uses specially formulated cross-linked polyethene (XLPE) insulation:
• Flexibility retained at –50°C
By incorporating advanced anti-freeze plasticisers, our cables remain flexible and successfully pass bending tests even at –50°C.
2. Dual Protection: UV Resistance and Extended Service Life
Although polar regions are cold, the thin atmosphere and snow reflection result in intense ultraviolet radiation.
• Slocable cable sheaths are compounded with high-efficiency UV stabilisers.
• This allows the cables to withstand continuous 24-hour sunlight during polar summers, effectively resisting photo-oxidative aging and ensuring a service life exceeding 25 years.
