Kiosk Substation Foundation Works: What is it all about?

November 17, 2017


It feels a little counterintuitive, this notion that a building can be designed with open foundations. Heavy structures employ steel grids and strong concrete mixes, with the dried base forming a solid pad, right? That's almost true. Kiosk substations are an exception. Instead of that solid concrete pad, there's a prefabricated frame, a base that's constructed of robust but open materials. Just why is this alternate building methodology adopted in this case?

What is A Kiosk Substation?

Picture this electrical distribution platform. Oil-filled switchgear is installed inside a substation, as is the area transformer and all of the power transmitting electrical equipment that distributes that transmitted energy. In a kiosk substation, all of these parts are installed inside a compact metal enclosure, a housing that incorporates all of these voltage converting parts. Consider that design for a moment. The prefabricated frame and its housing will be lowered by a crane onto a pad. The only problem, of course, is that there needs to be a pathway for the cables so that a connection can be made between the transformer switchgear and the terminating cables, the ones routed through the underground trenches. A solid base, therefore, is not an option.

Kiosk Substations: Constructing the Foundations

In days gone by, gravel was laid in a strip around a substation. Under that gravel, pipes carried the high-voltage cables into the substation. Modern structures employ a more contemporary approach. Specially designed seals enter and exit multiple apertures under the base. They're expertly channeled and pulled into the switchgear pit. As for those prefabricated units, the kiosk substations mentioned above, strong ready-made frames, each machined with multiple frame openings, are fitted before the substation housing is lowered into place. They're designed with low-voltage and medium-voltage segments, which play the role of input/output cable ducts. Cable gland kits and enclosure boxes interrupt the frame material at regular intervals, all so that the cabling can be sealed before it enters the kiosk enclosure.

Compact kiosk enclosures are proliferating around the globe. They install quickly while withstanding the most arduous environmental conditions. Underneath the transformer-hosting framework, a tough concrete pad fitted with pipes and enclosures acts as the ideal connectivity interface. Alternatively, for an even tougher build, prefabricated frames are lowered into place in place of the concrete pad. The strengthened frame comes complete with all of the electrical fittings and glands required to connect the kiosk switchgear to the underground cables. Incidentally, this work requires the services of a technician who has certificates in medium-voltage electrical work.

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