Abb Switchgear Manual 12th Edition Pdf May 2026

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2. Basic Principles of Arc Quenching

• Arc formation: When contacts open under load, an arc sustains current.
• Quenching methods:
  • Air (magnetic blow-out, arc chutes)
  • Oil (mineral oil – now less common)
  • SF₆ (high dielectric strength, used in GIS)
  • Vacuum (preferred for MV – high insulation recovery)
• Key terms: Restriking voltage, recovery voltage, interrupting rating.

4. Medium-Voltage Switchgear (1 kV – 52 kV)

• Types:
  • Air-insulated (AIS) – ZS1, Unigear ZS1/ZVC
  • Gas-insulated (GIS) – ZX2, ZX1.2 (SF₆)
  • Shielded solid insulated (SIS) – SafePlus
• Internal arc classification: IAC (AFL, AFLR) per IEC 62271-200.
• Switchgear assemblies: Metal-enclosed, metal-clad, cubicle types.

4. Dimensioning and Planning (The Engineering Core)

• Current Carrying Capacity: Thermal dimensioning of busbars and conductors.
  • Derating factors for ambient temperature and enclosure type.
• Short-Circuit Strength:
  • Calculating peak short-circuit current ($i_p$) and thermal short-circuit current ($I_th$).
  • Mechanical stress calculations for busbars and support insulators.
• Cable and Busbar Sizing: Tables and calculation methods for selecting appropriate cross-sections based on load and fault current requirements.

C. High Voltage (HV) Switchgear

• GIS Technology: Layout and components for HV substations.
• Hybrid Switchgear Modules: Combining AIS and GIS technologies.