DESCRIPTION
Our Metal-Enclosed Bus Duct is covered with a metal case, suitable for power plants and substations, buildings, and bus bar facilities in a factory. The Isolated Phase Bus (IPB) is optimum for high-currents and important high capacity facilities and power plants. Since the conductor is enclosed within a grounded metal case, there is no risk of accidents with the charging mechanism. Even if any accident occurs, the spread of the accident is limited. Finally, it is designed by complying with international standards such as ANSI, IEEE, and IEC, the product endures thermal or mechanical shocks from a short circuit. The conductor is insulated by the support from the insulation shell or the epoxy support insulation (porcelain for IPB).
MEDIUOM VOLTAGE NSPB
Our Medium Voltage NSPB connects the generator-to-transformer and the transformer-to-switchgear of the small-capacity power plant or substation, as well as the transformer-to-switchgear or the switchgear-to-switchgear of various other industrial facilities or buildings.
Features
- Rated voltage is over 1kV and less than 36kV and the rated current is available up to 5,000A
- Material of the conductor is copper or aluminum; insulation tubing of the conductor is available at the request of the customer
- Insulation laminate or epoxy insulator is used for conductor support, taking into account the mechanical strength, against a short circuit
- Conductor size is designed to withstand the continuous ratings of the system and thermal characteristics from a short circuit
- Connecting area of the conductor is silver-alloyed in order to prevent deterioration and designed with consideration to the overall thermal expansion of the conductor
- In order to prevent condensed water in the unit, the bushing is installed in the penetration of the wall, the section where the indoor/outdoor bus duct is connected
- Wall penetration is constructed after providing installation perfect weatherproof material
- One space heater per unit is included in the indoor/outdoor bus duct to eliminate moisture
Kian Tajhiz’s Isolated Phase Bus (IPB) is used in power plants and in industry where high-current medium voltage links are required. It was designed by taking into account the thermal and mechanical strength required against the short circuit current, earthquake, or typhoon. With its high thermal and mechanical strength, it has been evaluated as a highly reliable, safe, and durable product.
The IPB transmits the high-capacity currents between the substation of a hydro, thermal, or nuclear power plant and the main transformer. With up to a possible 40,000A rated current, Kian Tajhiz IPBs are classified into two types: self and forced cooling IPBs. Kian Tajhiz’s IPB places the individual conductor in the isolated phase type. With this configuration, the perfect closure prevents heat from transferring to neighboring structures and the malfunction of electric devices, as well as reduces the accidental current generated by the phase isolation. In order to reduce installation cost and time, Kian Tajhiz assembles as many parts as possible in the factory before delivery and supplies the necessary materials for installation, taking into account the construction conditions at the site. The IPB does not require maintenance; however, if needed, the inspection window is included in all sections where insulators are installed for easy maintenance.
Features
- Conductor: For heavy capacity, an octagonal duct made up of two 99.5% pure aluminum sections welded together at regular intervals by spacers is used, thus maintaining a constant clearance.
- Enclosure: Each phase is enclosed in a weather-proof, dust-tight, and nonmagnetic metal enclosure.
- Painting: For more effective cooling, the conductors and enclosures are painted. The outside of the enclosure is painted in accordance with the customer’s specification.
- Supporting structure: IPB supporting structures are designed, usually with galvanized steel, to be spaced at maximum intervals. Each enclosure is secured to these structures by clamped or sliding supports to allow for expansion.
- Post insulator: Bus support insulators are interchangeable, have a high creepage distance, and high strength in order to withstand electromechanical stress due to short circuit, wet processes, and fine glazed porcelain
- Expansion joint: Expansion joints on the conductor and the enclosure allow the isolated phase buses to expand freely and restricts the expansion forces imposed on the civil works to those of friction.
- Wall entrance: Where the isolated phase bus passes through the power station wall, the space between the enclosures and the wall is blocked with an aluminum plate and insulating flanges allowing isolated phase bus expansion.
- Pressurization (Anti-condensation): In the case of self cooling, pressurization is not necessary, owing to the use of porcelain insulators with a long creepage distance; Pressurization may however be necessary in the case of a particularly aggressive environment to achieve anti-condensation.