Personnel can be protected from arc flash hazards by means of personal protective equipment (PPE) or by modifying the design and configuration of electrical equipment. The best way to remove this hazard is to de-energise electrical equipment when interacting with it. De-energising electrical equipment does, however, pose it own arc flash hazard. DEHNarc is a modular arc fault protection system for low-voltage distribution boards in transformer stations which protects persons from the effects of arc faults during live work. The arc fault protection system detects arc faults in installations and immediately causes a short-circuit which trips the upstream overcurrent protective devices. As a result, the incident energy is reduced considerably. This arc protection system limits the thermal effects of arc faults significantly. The mobile components can be integrated in the open switch rack within a few seconds, removed after the work has been done, and used again for the next installation. This increases flexibility and minimises investment costs.
Contact Alexis Barwise, DEHN, Tel 011 704-1487, alexis.barwise@dehn-africa.com
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