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In a retrofill solution, the existing switchgear cell and bus are modified to accept the new circuit breaker. This option requires a longer bus outage (compared to the direct replacement option), during which time the internal circuit breaker cell is modified to accept the new circuit breaker.
Low Voltage Retrofill
Features a Masterpact cradle and circuit breaker, along with a new racking mechanism and primary and secondary connections in each switchgear cell. Existing cells are modified to accept the new cradle and circuit breaker, including a custom-engineered connection between the cradle and the switchgear line and load side bus. Custom designs are available for any manufacturer’s low voltage switchgear.
Medium Voltage Retrofill
This solution upgrades switchgear by installing a new medium-voltage circuit breaker and cell into an existing line-up. Necessary modifications – including an all-new racking mechanism, primary and secondary disconnects and customized connections – are made to the existing cell. Available designs include:
» Air-magnetic to vacuum or SF6
» Air-blast to vacuum or SF6
» OCB switchgear to vacuum or SF6 switchgear
» Convert stationary circuit breaker to draw-out, or obsolete air circuit breaker to vacuum or SF6