Abstract
This paper presents the history of the operating experience and surge-voltage recorder data for the years 1926 and 1927, on the first 220-kv. line in the East. The system of the Pennsylvania Power & Light Company is described. Lightning weather data, design characteristics of the 220-kv. line involved, and details of connection and installation of surge-voltage recorders are given. The study shows the magnitude of surge voltages encountered, method of classification, effect of our overhead ground wires, etc., and points out the necessity for comprehensive lightning research, which will permit a systematic solution of transmission problems.

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