Tie-Line Control of Interconnected Networks

The paper describes operating experience with tie-line load regulators on the tie connecting the Colfax Power Station of the Duquesne Light Co. and the Springdale Station of the West Penn Power Co. A description is given of the equipment used and also of supplementary equipment, such as program loading equipment installed at Colfax to maintain the most economic division of load between the various generating units. A new hydraulic speed changing device intended to reduce wear on the governor parts to a minimum is also described. Tests made jointly by the Duquesne Light and West Penn Power Companies to determine the effect of operating frequency and tie-line regulators simultaneously are discussed and the curves giving the results are shown.