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Wiring Principle of Small Busbar in High Voltage Switchgear

The small busbar in high-voltage switchgear is typically connected sequentially to each circuit breaker and isolator, ensuring proper phase alignment, sectionalization, and integration with protection and control circuits.Busbar Configuration Overview

In high-voltage switchgear, the small busbar is often part of a single bus or sectionalized single bus system, where each incoming and outgoing circuit connects to the bus through its own circuit breaker and isolators . Sectionalization may include a bus coupler breaker to divide the bus into segments, allowing maintenance without interrupting the entire system . For more complex arrangements, such as double bus or double breaker/double bus systems, each circuit may connect to two buses via dedicated breakers, providing redundancy and operational flexibility .

Wiring Sequence Principles
  1. Phase Alignment: Connect the busbar to each circuit breaker in the correct phase sequence (R, Y, B) to maintain system balance and prevent phase-to-phase faults .
  2. Breaker Connections: Each breaker is connected to the busbar via its line-side terminals, ensuring that the busbar supplies power to the breaker and downstream circuits .
  3. Isolator Integration: Busbar isolators (disconnectors) are installed between the busbar and each breaker to allow safe isolation for maintenance. The wiring sequence ensures that the isolator can fully disconnect the breaker from the bus without affecting other circuits .
  4. Protection and Control Wiring: Auxiliary wiring for CTs, PTs, relays, and trip circuits is routed from the busbar to the protection devices. Phase-to-phase and phase-to-neutral connections must follow the schematic to ensure correct relay operation .
  5. Sectionalization and Couplers: If the busbar is sectionalized, the bus coupler breaker is wired to connect the segments. The sequence ensures that each segment can operate independently or together, depending on operational requirements .
  6. Earthing and Bonding: Proper grounding of the busbar is essential. The sequence includes connecting the busbar to the main earth bar and ensuring all metallic parts are bonded to prevent potential differences .
Commissioning and Verification

Before energizing the busbar:

  • Verify phase sequence and continuity using a phase rotation meter .
  • Measure busbar resistance and contact resistance to ensure tight connections (
Wiring Principle of Small Busbar in High Voltage Switchgear

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