Phoenix Contact explains how arc quenching technology boosts safety and system uptime in environments including EVs, solar power and data centres.
With the rise of DC applications in electric vehicles, solar photovoltaic systems, battery energy storage systems and data centres, DC arc flash has become a critical safety concern which involves unique challenges due to its continuous energy release.
During maintenance, the entire DC system must be shut down to minimise risks, which takes time. So, what if it was possible to safely shut down some elements of a system, to exchange parts for example, while the rest of the system continues operating? This would mean high availability, with downtimes a thing of the past.
A DC arc flash is an uncontrolled release of thermal energy, pressure and light caused by a fault in a DC system. It poses serious risks such as burns, blast injuries and equipment damage due to its continuous, non-extinguishing arc behaviour.
DC arc flash is continuous because DC current does not have a zero-crossing point like AC. As a result, DC arcs sustain longer, cause deeper burns, require larger arc flash boundaries, and may need higher-rated personal protective equipment.
Firstly, arc flashes can generate temperatures over 35,000°F, causing severe second- or third-degree burns instantly on exposure. Secondly, the sudden expansion of air and vapourised metal creates a violent pressure wave, which can cause concussions, lung injuries or even throw workers across a room.
Thirdly, conductors and nearby metal components can melt and spray molten metal, leading to deep burns and damage to eyes and skin. Finally, the flash produces intense ultraviolet and infrared radiation, which can cause permanent eye damage (such as retinal burns) and skin injuries similar to severe sunburn.
Phoenix Contact’s DC connectors with ArcZero technology safely and reliably protect the operator against hazardous electric arcs. This makes handling during installation and maintenance easy. During maintenance, device replacement can simply be carried out under load.
The special feature is integrated into the DC connector, with an innovative piece of electronics in the connector actively quenching the electric arc.
By understanding the unique challenges of DC arc flash and leveraging advanced solutions like ArcZero technology, manufacturers can ensure safer and more reliable electrical systems in an increasingly DC-powered world.
