Overvoltage on Transmission Systems Caused by Dropping Load Discussion of Means of Limiting Such Overvoltage with Particular Reference to the Use of Generator Voltage Regulators

In a previous article¹ the author showed the manner in which under different conditions the voltage on transmission systems will rise due to the dropping of load, and described some means of limiting the voltage rise to avoid overstressing insulation. This paper describes further means of limiting the voltage under such conditions, considering first an improved type of regulator and wheatstone bridge main exciter field rheostat and second, as an alternative, a method of automatically inserting resistance in the alternator field circuit. Tests are described which show the effectiveness of these methods of limiting the voltage.