How many close coils does an EHV breaker have?

An extra-high voltage (EHV) circuit breaker is typically designed with a single close coil. This coil serves the purpose of controlling the operation of the breaker mechanism, allowing it to either open or close the contacts when required. The presence of one close coil is essential to maintain a straightforward and reliable operation since it allows for effective maneuvering of the breaker under the conditions associated with high voltage systems.

A single coil simplifies the design and functionality while ensuring that the circuit breaker can respond quickly and efficiently to control signals. This design choice is particularly important in EHV systems where reliability and speed of operation can significantly impact the overall stability of the power grid. Understanding the specific design and operational characteristics of EHV breakers is crucial for anyone involved in substation operations and maintenance.