Unlike indoor Gas Insulated Switchgear (GIS), an ORU is exposed to the elements. Design must account for:
A premium "fail-safe" design where three breakers serve two circuits. This ensures that even if one bus is lost, all circuits remain powered.
The primary defense, capable of interrupting massive fault currents (often up to 40 kA) within milliseconds. shema oru 220 kv
An outdoor 220 kV switchgear is characterized by its sprawling "yard" where equipment is spaced out to prevent electrical arcing through the air. A standard scheme typically includes:
Highly flexible; it allows any circuit to be switched from one bus to another without interruption, making it ideal for busy regional hubs. Unlike indoor Gas Insulated Switchgear (GIS), an ORU
A simpler, more cost-effective layout often used for smaller industrial taps where absolute redundancy is less critical. 3. Challenges in the Open Air
The "senses" of the substation that scale down 220,000 volts and thousands of amps for safe monitoring by the control room. The primary defense, capable of interrupting massive fault
The large copper or aluminum conductors that serve as common electrical junctions for multiple lines. 2. Strategic Design Schemes