Welland Hydro recently undertook a program to modernize one of their older medium-voltage substations. The substation was built in the 1960’s and much of the equipment had become obsolete having reached the end of its life. This included the medium-voltage switchgear in which the circuit breakers were obsolete and was causing Welland Hydro operational and safety issues.
ABB’s OneFit solution is applicable for all non-ABB switchgear enabling an easy and fast retrofit of the circuit breaker. It utilizes ABB’s standard and active circuit breakers. The standard option of electrical and remote rack in/out feature improves safety and operations. The solution balances the need for a Retrofill solution with reasonably limited site works andreduced outage time compared to a switchgear replacement.
Welland Hydro approached ABB for suggestions on upgrading the switchgear. ABB presented several options and the customer selected the OneFit solution as it also provided many operational and safety improvements compared to traditional retrofit solutions. OneFit is the latest ABB hard-bus Retrofill design concept embedding an integrally safe plug-in technology to easily connect the new circuit breaker to a wide range of existing non-ABB panels. The Welland project involved the retrofit of four Magne-blast 5kV circuit breakers and protection relays, installation and commissioning and training services.