It is proposed to carry out secondary injection with the relay still connected to the CTs (not using test terminals but injecting directly onto the loop). Has anyone done such a test before, i doubt it is meanful?
I recently had a contractor doing ratio tests on our transformers but they were using the reference capacitor method instead of the conventional voltage method. They basically used a capacitor of known size in series with one winding while applying high voltage (11KV) on the other winding (HV)...
