SGC SwitchGear Company’s patented SV-25 and SV-50 **Arc-Killer** takes safety to a new level. Not just the operator and the environment are shielded from harm, but the super swift arc extinguishing system allows cubicles to be back in operation very quickly in case of an internal fault.
Protect your cubicles, your infrastructure, and especially your staff against the negative consequences of an internal arc.
The built-in Arc-Killer extinguishes an arc in less than 50 ms, by directing it to a metal earthed short circuit.
This solution is patented and KEMA type tested according to IAC: B-FLR (unrestricted accessibility (includes public) 20 kA/1s.
Key features and benefits
• Can make MV switchrooms safer
• Super fast arc fault quenching
• Protection of workers from the potentially toxic gases, from overpressure in case of compact switch room, and eliminates the hazard of fire propagation • Reduce complexity of MV design
• B-FLR internal arc classification achieved without need for ducting or venting of the arc fault gases outside of switchgear
• Simplified installation
• Reduced installation requirements and automatically ensures
• The internal arc classification of the switchgear is maintained in any application and is not compromised by incorrect installation
The metal-enclosed cubicles of the SGC’s switchgear are combined with a shaft at the rear of the cubicle. The shaft absorbs the gasses (in case of an internal arc) that escape through the overpressure valves. As a result, the expansion of hot gasses in a room can be reduced to an absolute minimum, offering KEMA type tested cubicles which give protection against an internal arc classification IAC category B,(unrestricted accessibility (includes public) FLR 20 kA 1 s. (F=frontal, L=lateral, R=rear)
As a result, the operator is protected against the negative consequences of an arc, whether they stand in front of the switchboard, next to it or behind
Design of the Arc-Killer system is shown in Figure 1
In the normal position the Arc-Killer earthing contacts are open and the spring of the mechanism is tensioned ready to close.
In the unlikely event of an internal arcing fault, the pressure in the panel will rapidly rise and in 18ms the Arc flaps will open into the arc duct, which is a fully enclosed chamber at the back of the panel. The opening flaps will activate the Arc Killer mechanism, via the flexible cable link connection, the Arc Killer contacts close and shunt all three phases together and to the earth. The arcing fault is eliminated in 48ms.
Due to the fast Arc quenching, fixed switchgear with the **Arc-Killer** has achieved the 20KA, 1s, **B-FLR unrestricted accessibility (includes public)** arcing fault rating without need for ducting or venting of the arcing fault and arc flash gases outside of switchgear.
The short duration of an arcing fault event and its full containment ensures protection of workers from the potentially toxic gases, from overpressure in case of compact switch room, and eliminates the hazard of fire propagation.
The Arc-Killer reduces installation requirements and automatically ensures the arcing fault withstand rating of the switchgear is maintained in any application and is not compromised by incorrect installation.