) gas; more compact and housed indoors, ideal for urban areas. 2. Power Transformers The "heart" of the substation. Steps voltage down from .
A dense copper mesh (earth mat) is buried underground to protect personnel from step and touch voltages. 🏗️ Technical Specifications (Typical) Standard Value Incoming Voltage 400,000 Volts (AC) Cooling Method ONAN/ONAF (Oil Natural Air Natural/Forced) Insulation Medium Porcelain/Composite for AIS; SF6cap S cap F sub 6 Busbar Configuration Double Main and Transfer (for high reliability) visit report of 400kv power substation
Uses atmospheric air as insulation; requires large footprints and visible overhead busbars. GIS: Uses sulfur hexafluoride ( SF6cap S cap F sub 6 ) gas; more compact and housed indoors, ideal
Visiting requires hard hats, high-visibility vests, and steel-toed dielectric boots. Steps voltage down from
Maintain strict "Safe Working Distances" from energized busbars to prevent flashover.
Houses the (Supervisory Control and Data Acquisition) system.