Retrofit implementation of medium voltage contactors at abou quir power station in egypt

A new generation of medium voltage vacuum circuit breakers were used to retrofit sealed Sf6 contactors which experienced difficulty in disconnecting the loads safely after 15 years of service. The new breakers which replaced the contactors and the associated fuses were mounted on the same panel truck preserving all original interlocks. Mechanical and electrical modifications were implemented to match the new breakers to the existing panel. Retrofitted breakers are in good service successfully for 5 years now.