RT-GFM High-Voltage Enclosed Common Enclosure Busway

Product Features

RT-GFM High-Voltage Enclosed Common Enclosure Busway is specifically engineered for electrical connections between high-voltage switchgear (rated for 6kV, 10kV, 20kV, and 35kV) and transformers. It is widely deployed in power supply systems for large industrial plants, major substations, captive power plants in large enterprises, large-scale construction projects, and connections between generators and step-up transformers, ensuring reliable power distribution across critical infrastructure.

The product adopts a segregated phase structure, where each phase is individually insulated and housed within a robust alloy enclosure, meeting stringent standards for insulation performance and operational safety. By separating the three phases in air, it achieves balanced three-phase voltage distribution, reduced temperature rise, high currentcarrying capacity, and straightforward installation, enhancing system efficiency and longevity.

The busway is equipped with intelligent monitoring devices along its entire length, providing real-time insights into system performance and ensuring secure power supply operation. It incorporates a dedicated control wire trench, simplifying installation and maintenance processes while optimizing space utilization.

The busway’s side panels are constructed from heat sink-style aluminum-magnesium alloy profiles with a thickness of 3.0mm. The integrated cooling fins not only improve heat dissipation but also reinforce structural rigidity, allowing side heights of up to 305mm without additional reinforcements. Top and bottom covers are made from aluminum-zinc coated steel, contributing to the overall structural integrity of the assembled busway. Side panels and base plates are securely fastened using high-strength imported rivets, while cover plates are bolted to the side panels for easy access. Each busway section typically includes strategically positioned standard inspection openings on the upper side (optionally on the sides to suit site-specific needs). Advanced manufacturing techniques at inspection points and high-performance expansion joint technology ensure the busway enclosure achieves an IP54 protection rating, delivering durability and resilience in diverse operating environments.

Structural Performance

● The busbar utilizes high-quality copper as the conductor.

● The enclosure is constructed from 4mm premium aluminum alloy plates, designed as fully enclosed and non-ventilated. It offers corrosion resistance, excellent heat dissipation, and effective grounding.

● A specialized modular assembly design allows flexible installation of large busway sections without requiring elbows, enabling systematic and standardized design and installation of the busway system.

● The busway enclosure features a smooth and flat surface, which can be painted according to customer requirements.

● A safety clearance of 150mm is maintained between each phase of the busbar, and each section of the busway enclosure is equipped with grounding terminals to ensure continuous and effective grounding after installation.

● The main busbar and support insulators can withstand the effects of rated peak short-circuit current and rated short-time withstand current without experiencing mechanical stress or electrical damage.

● The enclosed busway can withstand a short-circuit current of I4 = 40kA for 4 seconds, with the short-circuit heating temperature not exceeding the limit, and can endure the mechanical stress generated by a short-circuit current (Ich = 100kA).

Structural Performance

High-voltage busway adopts a high-strength and high-performance DMC insulation support block clamping structure, offering excellent load performance and dynamic/thermal stability. It features strong overload capacity and low temperature rise. As a reinforced insulation fully enclosed high-voltage busway, it achieves IP40 protection rating, with conductors fully encapsulated by high-voltage heat-shrink tubing. It can be installed at altitudes up to 2000m.By replacing traditional exposed busbar wiring with enclosed encapsulation, the high-voltage busway significantly reduces power outage maintenance frequency. When transmitting high currents, it eliminates faults caused by uneven current distribution associated with using multiple parallel high-voltage cables, ensuring reliable power supply.

Scope of Application

Common-Enclosure Busway A new type of enclosed busway designed for power supply systems with AC 50–60 Hz, voltage 3.6 kV, and rated current ranging from 400 A to 6300 A. The RT-GFM series high-voltage common-enclosure busway is suitable for electrical connections between high-voltage transformers and high-voltage switchgear, as well as between generator sets and stepup transformers.

Product Features

● The series features excellent short-circuit resistance, with its aluminum enclosure effectively reducing structural heating caused by eddy currents or circulating currents, thereby lowering the busway surface temperature, minimizing energy loss, and increasing current-carrying capacity.

● Flexible structural design allows maintenance access holes to be positioned freely on the top or bottom. For high-current indoor busways, ventilation louvers are installed on both sides and the bottom to enhance heat dissipation and reduce temperature rise.

● Double insulation and multi-point grounding connections significantly reduce maintenance requirements while substantially improving safety performance.

● Corrugated expansion joints enable simple installation and two-dimensional adjustment (horizontal/vertical), accommodating thermal expansion/contraction and compensating for foundation settlement errors.

● Vibration from transformers, generators, and distribution cabinets is mitigated using flexible connections (copper braids) and rubber pads between enclosures. Additional shock absorbers provide elastic support for insulators and conductors.

● The exterior is painted light gray to reduce visible light absorption, while the interior uses black paint to enhance radiant heat transfer and prevent corona discharge.

● All joints are silver-plated to increase allowable temperature rise to 65K, resisting electrochemical corrosion in coastal/industrial atmospheres and reducing contact resistance.

● Sealed inspection windows at connection points allow temperature monitoring via indicators or infrared sensors. Current transformers can be installed at generator outputs/exciter transformer primaries for current measurement.

Technical Parameter

Rated power frequency dry test withstand voltage (1 minute), rated (lightning) impulse withstand voltage, rated operating voltage, and maximum operating voltage.

FAQ

What is a high voltage bus bar?

A high voltage bus bar is a conductor used to carry electrical current in high-voltage systems. In an enclosed busway or bus duct system, the bus bars are integrated into a protective enclosure together with insulation and structural components, allowing safe and stable power transmission between equipment such as transformers, switchgear, and generators.

How is high voltage busway installed?

High voltage busway installation depends on project layout, voltage level, and routing conditions. The system is typically assembled in sections, including straight lengths, bends, and expansion joints. Flexible connections and vibration control measures are used at equipment interfaces such as transformers and generators. Proper alignment, grounding, and insulation clearance are important to ensure reliable operation.

What is the difference between busway and bus duct?

In most industrial applications, “busway” and “bus duct” refer to the same type of enclosed conductor system used for power distribution. The terms are often used interchangeably, although “bus duct” is more common in project and procurement language.

Where is high-voltage enclosed busway used?

It is commonly used in power distribution systems for substations, industrial plants, and large-scale infrastructure projects, especially for connections between transformers, generators, and high-voltage switchgear.

What factors should be considered when selecting a busway system?

Selection should be based on voltage class, rated current, installation environment, routing layout, expansion requirements, and maintenance access conditions. Early technical discussion helps ensure a suitable configuration.

Need a reliable high-voltage busway solution for your project?

ZHERUTONG provides high-voltage enclosed busway and bus duct systems tailored to your voltage level, current capacity, and installation conditions.
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