The purpose of the thesis was to develop the relay testing system for the 615 series protection relay and create a document for PVC. The testing system need to be safer, more proper and ready for automatic testing.

The requirements affected the final results. The new testing system needs to be able to simulate breakers and switches for all standard configurations. The testing system must be able to adapt for a protection relay swap without any physical changes.

The requirements were completed and the system is in use. The design and implementation of the physical part took a lot of time. This was the first step towards automatic testing. The system will be updated in future and developed further. The end result in this is to develop the own ‘’brains’’ for testing system, meaning the wiring will set up automatically after swapping a new protection relay to the system.