K-B Type High-Voltage Bus Duct

This is an air-insulated high-voltage feeder system comprising copper or aluminum plate conductors --called bus bar-- supported by insulators, which is covered by a steel or aluminum casing. A lightweight, compact sized new product called nonsegregated phase bus type has been developed, in which conductors for three phases are accommodated in block in a casing, and no bulkhead is provided between the phases.

Features

1. Attractive appearance

The product has an attractive appearance because welding flexure is eliminated from the casing.

2. Lightweight

The casing has a plate-assembly structure with high strength, enabling the reduction of plate thickness. Thus, the weight has been reduced by as much as 20% compared with conventional products of ours.

3. Ease of installation

Unlike high-voltage cable termination, the installation needs no special skill or components.

4. Ease of dimension adjustment

The dimension adjustment unit has been introduced enabling a dimension adjustment of ±10 mm.

5. Large allowable current for short duration

The product allows a large current capacity for short duration because the conductors are supported by insulators at regular intervals.

Uses

Private electric power generating facilities for large buildings, i.e., electric feeder lines between a generator and the primary side of a transformer
Receiving and transforming facilities, i.e., electric feeder lines between the secondary side of a high-voltage transformer and a distribution board

Standard Specifications

Standard	JEM 1425
Type	Nonsegregated Phase Bus type
Circuit	Three-phase, three-wire circuit
Nominal voltage	3.6 kV to 36 kV
Nominal current	600 A to 3000 A
Material	Conductor: Copper
Material	Casing: Steel or aluminum
Conductor supporter	Epoxy resin insulator

Places of supply

Office building, Factory, Electric power plant, Sewage-disposal plant, Waste treatment plant

Topic

The product has appeared on OHM, December 1999, a must-see magazine for electrical engineers, and on many industrial newspapers.