J. H. Cox

Klydonograph Surge Investigations

Since its recent development, the klydonograph has been used to investigate surge conditions on a number of transmission systems. Quantitative data, which show the characteristics of the actual surges present on transmission systems, are presented. In addition, these data are discussed in relation to various existing theories and practises regarding the production and the elimination of transient high voltages. The correctness of some of these ideas and the fallacy of others are indicated. The paper is subdivided, according to the nature of individual investigations, as follows: I. Open-wire Systems. II Cable Systems. III. Lightning Arresters.

The Klydonograph and Its Application to Surge Investigation

In the past few years the need of a device for recording voltage surges on transmission lines has been felt more and more. Realizing this need, J. F. Peters, in the fall of nineteen twenty-three, developed the klydonograph which utilizes the Litchtenberg figure to record the characteristics of transient voltages. The principle of the instrument and practical connections to a line are discussed. The results obtained in the field from four investigations are given. Parts II and IV describe the first experimental model of the klydonograph which uses a stationary glass photographic plate in removable plateholders with a moving electrode, and the commercial type of klydonograph which uses a day-light loading roll film of sufficient length to last seven days. This latter model has three electrodes for connection to a three-phase line.

Theoretical and Field Investigations of Lightning

This paper gives a review of some recent developments in the methods of studying lightning phenomena. The Norinder form of cathode ray oscillograph and its application in Tennessee are discussed, together with the information secured. The second part gives the theory of traveling waves along transmission lines. Reflections at open and grounded ends are considered. A mirror scheme of an infinite series of waves on a double infinite line equivalent to actual waves along a finite line is developed. The third part discusses the manner in which surges are actually produced on lines by lightning and the effect of ground resistance on the protection afforded by ground wires, both with respect to induced and direct strokes.

Symposium on Lightning Lightning on Transmission Lines Cathode Ray Oscillograph Studies

This paper is a review of the work done and results obtained in Norindertype cathode ray oscillograph studies of lightning on transmission lines during 1929. The various installations and methods of test are described. The wave shapes recorded are illustrated and their meaning discussed. The paper also contains a preliminary description of an artificial lightning investigation, using a portable 1,000,000-volt surge generator and a portable cathode ray oscillograph. The methods used and some of the preliminary results are discussed.

Regulation of grid-controlled rectifier

This paper discusses several factors which have not been included in the previously published regulation formulas and which should be considered in the practical application of rectifiers. Approximate solutions are given to take system reactance, and the load inductance into account. The effect of grid pickup characteristics on regulation, and means of modifying the inherent regulation characteristics by regulators or compensators are discussed.

Ignitron Rectifiers in Industry

WHEN a new device is developed, it is usually adopted and proved by a particular industry. In the case of the ignitron rectifier, the first applications were in transportation service in mines and railways. The apparatus and its performance in these early installations were discussed by the present authors in an earlier Institute paper.1

Excitation Circuits for Ignitron Rectifiers

Discussion of paper 41–127 by H. C. Myers and J. H. Cox, presented at the AIEE summer convention, Toronto, Ontario, Can., June 16–20, 1941, and published in AIEE TRANSACTIONS, 1941 (October section), pages 943–8.

Ignitrons for the Transportation Industry

THE USE of the multianode metal-tank mercury-arc rectifier is well established in the transportation industry. At the present time there are approximately 500,000 kw of these rectifiers in operation on railway properties in America. The units vary in size from 500 to 3,000 kw and range from 500 to 3,000 volts direct current.

Transmission Line Voltage Surges

Records of the transients actually occurring on transmission lines of widely varying characteristics have been obtained recently with the klydonograph. 1. These records substantiate many of the theories of transients on lines. 2. They indicate the incorrectness or incompleteness of some of these theories. 3. They suggested modifications or extensions of these latter theories. This paper is a coordination of those theories which agree with test data obtained up to the present time. Since the results of the klydonograph surge investigations are presented in a companion paper, only the data required to make this paper complete in itself are included.

Abridgment of theoretical and field investigations of lightning

This paper gives a review of some recent developments in the methods of studying lightning phenomena. The Norinder form of cathode ray oscillograph and its application in Tennessee are discussed, together with the information secured. The second part gives the theory of traveling waves along transmission lines. Reflections at open and grounded ends are considered. A mirror scheme of an infinite series of waves on a double infinite line equivalent to actual waves along a finite line is developed. The third part discusses the manner in which surges are actually produced on lines by lightning and the effect of ground resistance on the protection afforded by ground wires, both with respect to induced and direct strokes.