Starting in 2003, CEG has designed substation capacitor banks for Great River Energy transmission substations. These banks ranged from 7200 kVar to 14400 kVar, at 34.5 kV and 69 kV. The scope included specification and selection of the capacitors, and physical, control and SCADA modifications. Each substation required a new breaker for the capacitor bank, foundations, control wiring and various modifications to the substation structures or site as needed. The control work consisted of protective relaying in the form of a primary differential voltage relay and secondary overcurrent relay, and incorporation of those relays into existing panels or a new relay panel. The projects also included 4 pole-top 34.5 kV capacitor banks of around 3000 kVar, located on transmission lines outside the substation and controlled from within the substation.
