Parallel operation of transformers with on-load tap changers and negative-reactance-compounding control

A systematic investigation has been made of the performance obtained when using a system of negative-reactance compounding for automatically controlling the tap changers of two transformers operating in parallel, either side by side or connected together through a distribution system. A wide range of operating conditions was covered by tests in the field, with a laboratory model and by computer studies. Stable parallel operation of the transformers was proved.