Current measurements by Rogowski coil and voltage measurements by a voltage divider with the digital bus where switchgear events and sampled measured values are shared allow decoupling engineering of measuring hardware from protection applications.
Line-to-ground currents are always measured in each feeder separately for the protection purposes of every IED. Incoming feeders use resistive dividers connected to cables and provide voltage measurements for IEDs in
incoming feeders.
Outgoing feeder protection schemes may need to use busbar voltage measurements. One outgoing feeder in section A includes resistive voltage dividers connected to the bus bar system in section A and a bus coupler equipped with resistive voltage dividers connected bus bar system in section B.
IEDs in these feeders besides the potential use of measured voltage for their protection schemes publish
voltage-sampled measured data to digital communication. All other IEDs either in
section A or B can subscribe to this digital voltage measurement for the particular protection scheme.
Finally, switchgear events are also shared among all feeders for switchgear control, blocking, or interlocking logic.
