MODULE 7 — Substations

7.1 Typical Substation Layout

132kV Line LA CB Isolator TX 132/33kV 33kV Bus CB

7.2 Busbar Arrangements

  • Single Busbar: Cheapest, low reliability. Maintenance requires shutting down.
  • Single Bus + Sectionalization: Isolates faults to one section.
  • Main & Transfer Bus: Allows breaker maintenance without outage.
  • Double Bus Double Breaker: Highest reliability, most expensive.