Substation Equipment

66 - 33/11 kV Substation Equipment

Equipment in a substation can widely be categorized as follows:

• Structures;
• Power transformers;
• Bus-bars;
• Circuit breakers (33 kV and 11 kV);
• Isolators or isolating switches (33 kV and 11 kV);
• earthing switches;
• Insulators;
• Power and control cables;
• Control panel;
• Lightning protection - surge arrestors;
• Instrument transformers (current and power transformers, i.e., CTs and PTs);
• Earthing arrangements;
• Reactive compensation;
• DC supply arrangement;
• Auxiliary supply transformer; and
• Fire-fighting system.

The design of substation equipment must comply with the requirement of relevant Standards.