Location of AC busbar in 10kV high-voltage switchgear

In 10kV high-voltage switchgear, the AC busbar is typically located in the busbar compartment, above or behind the circuit breaker and feeder compartments, within a metal-enclosed, insulated section.

Busbar Positioning

In standard 10kV indoor switchgear, such as ring main units or KYN28-12 type cabinets, the AC busbar is installed in a dedicated busbar compartment that is separate from the cable and circuit breaker compartments . This compartment is usually metal-enclosed and insulated, often using SF6 gas or epoxy insulation to ensure safety and prevent accidental contact . The busbar runs horizontally across the switchgear panel, connecting incoming and outgoing feeders, and may be configured as a single busbar, double busbar, or with a bypass bus depending on the system design .

Relation to Other Components

• Circuit Breakers: The busbar is positioned so that each circuit breaker can connect to it via a draw-out or fixed connection. The breaker compartment is typically below or in front of the busbar compartment .
• Disconnectors and Earthing Switches: Busbar disconnectors are installed within the busbar compartment to allow isolation of sections for maintenance without interrupting the entire system .
• Instrument Transformers: Current transformers (CTs) and potential transformers (PTs) are often mounted near the busbar to measure current and voltage for protection and metering purposes .

Safety and Accessibility

The busbar compartment is hermetically sealed and IP65 rated, providing protection against dust, moisture, and accidental contact . Access is only allowed when the switchgear doors are closed or with proper interlocks to ensure safe operation. In modular designs, the busbar can be extended or modified without interrupting the operation of other sections .

Summary

In essence, the AC busbar in 10kV switchgear is located in a dedicated, insulated compartment, typically above or behind the circuit breaker and feeder sections, allowing safe power distribution, easy sectional isolation, and integration with protective devices. This layout ensures operational reliability, safety, and flexibility for maintenance or future expansion .