What is the function of blowout coils in medium-voltage motor starters?

Blowout coils in medium-voltage motor starters serve a specific function related to arc suppression during the motor starting process. When a medium-voltage motor starter operates, it can generate an electrical arc as the contacts open or close. The arc can damage the contacts and create safety hazards.

The blowout coil generates a magnetic field that effectively "blows out" or extinguishes the arc that forms between the contacts. This is achieved by directing the arc into a specified path, reducing its duration and energy. By controlling the arc, blowout coils help ensure the longevity of the contact points in the starter and enhance overall safety during motor operations.

Understanding the role of blowout coils is crucial for anyone working with medium-voltage equipment, as they directly relate to arc management, which is essential for safe and reliable motor control. Implementing blowout coils allows for safer operations, minimizes maintenance required for contact points, and helps protect the integrity of the motor starter.