The project involved engineering prior to installation to determine the relay settings, a wiring schematic, assistance with panel layout, removal of equipment with replacement as well as testing and field commissioning. A total of 4 circuit breakers at 2 different substations were completed, replacing 20 existing relays.
Below, right, is a bench test of one of the relays after programming to verify correct functionality. The latching relay in the lower left hand corner was connected to simulate the operation of an oil circuit breaker open close operation with 52a contact transition during reclosing. Both relays were tested in this fashion to speed installation. Once the relays were installed, current injection tests were performed to verify ct continuity as well as functional testing of the control scheme.
The completed relay installation with OCBs back in service.