Kyn28 High Voltage Switch Top Busbar Routing

In KYN28 high-voltage switchgear, the top busbar is routed in a dedicated upper rear compartment using a three-dimensional layout to connect main, branch, and grounding buses safely and efficiently.

Busbar Compartment and Layout

The top busbar in KYN28 switchgear is located in the upper rear part of the cabinet, forming the main bus system that interconnects all units within the switchgear. This compartment is separated from the circuit breaker and cable compartments to ensure safety and maintain proper clearances. The busbars are typically horizontally aligned but can adopt a three-dimensional routing to optimize space, reduce cabinet volume, and maintain aesthetic appearance while meeting electrical safety distances.

Three-

Dimensional Busbar Routing

The three-dimensional busbar design allows multiple bus sets (main, branch, and grounding) to be installed within limited space. This layout improves airflow, heat dissipation, and short-circuit withstand capability. Busbars are mounted on insulated supports and connected to current transformers, circuit breakers, and outgoing feeders.

The routing ensures minimal interference with the withdrawable circuit breaker trolley and facilitates maintenance.

Electrical and Mechanical Considerations

When designing or routing the top busbar, the following parameters are critical: Rated current and short-circuit current: Busbar cross-section and material must handle the maximum load and fault currents. Insulation and spacing: Heat-shrinkable insulation or epoxy-coated busbars are used to prevent arcing and maintain dielectric strength. Connection points: Busbars connect to fixed contact boxes in the busbar compartment and to the circuit breaker truck via flexible or rigid connectors.

Support and alignment: Auxiliary support posts and insulated mounting brackets maintain mechanical stability and prevent vibration or sagging.

Practical Implementation

Main bus: Runs continuously through the top compartment, connecting all switchgear units. Branch bus: Taps off the main bus to feed individual circuit breakers. Grounding bus: Routed parallel to the main bus, ensuring reliable earthing.

Maintenance access: The compartment design allows safe inspection and replacement without disturbing other sections.

Summary

The top busbar routing in KYN28 switchgear is a carefully engineered three-dimensional layout in the upper rear compartment, balancing electrical performance, safety, and space efficiency. Proper routing ensures reliable power distribution, facilitates maintenance, and meets IEC and GB standards for medium-voltage switchgear.