KYN550-12 Metal-Clad Switchgear

It need not be uniform. Five widths are available — 550, 600, 650, 800 and 1000 mm — chosen per cubicle against its rated current and component fit: small feeders take 550 or 600 while large incomers and bus-ties widen as needed. Mixing widths in one line-up is the normal approach and makes the total length shorter than a single-width arrangement. The point to watch is that the busbar has to run continuously across cubicles of different width, and ETENZ works that transition out at drawing stage.

It is this model’s main busbar rating, with distribution busbars also available to 4000 A. The typical places that need it are substation main incomers, large station-service supplies in power plants, and any line-up carrying many circuits on one busbar that should not be sectionalised. Where the busbar current falls short, the alternatives are sectionalising or adding a bus-tie, and both add cubicles and floor area. Send the total line-up load and whether sectionalising is acceptable, and whether 4000 A is a requirement or headroom becomes clear.

From the switchroom civil conditions first, with the electrical layout worked out afterwards. Depths run 1100 to 1650 mm in six steps and heights 2000 to 2300 mm in four. The switchroom depth has to take the cubicle depth plus front operating and maintenance space and the truck withdrawal travel, and the clear height has to take the cubicle plus the busbar bridge and top duct. Once those are set, busbar sizes and component layout are arranged in what remains. Send the switchroom layout with clear height and it can be confirmed during quotation.

On capacity and width. A 4000 A main busbar takes KYN550-12, the highest busbar rating in the series. A wide fault range with rated current to 3150 A takes KYN28A-12. A severely limited switchroom area, where 630 to 1600 A is acceptable, takes YF-KYN450-12 at 475 to 550 mm wide and 1100 mm deep. The series page carries the full five-model comparison.

Four things give a preliminary scheme: the single-line diagram, rated voltage and total line-up current, the system fault capacity, and the switchroom dimensions with clear height. For a contract-grade quotation, add each cubicle’s primary scheme and rated current, control supply type and voltage, metering and protection requirements, cable entry arrangement and cable sizes, communication interfaces, and the standards and document list for the destination market.

Yes. Switchgear is supplied as equipment while an MV switchgear E-House or power module is supplied as an enclosure — the first is the panel itself, the second covers the enclosure, equipment layout, auxiliary systems and interface integration. The selectable widths help here, since the line-up can be packed more closely to a given module length. Where it goes inside as the primary equipment, ETENZ details the line-up arrangement, busbar connections and in-module interfaces, and the delivery boundary is settled once at contract stage.