D. C. High Voltage Cable Testing Sets

Abstract

In a. c. high voltage tests of long cables, the capacity of the transformer may be necessarily large on account of the great amount of the charging current. The necessary power often amounts to several hundred K. V. A., because of increasing in proportion to the capacity of the lines and to the square of the voltage, so that the a. c. testing sets are inconvenient for transportation owing to its large size.
To overcome these difficulties, the d. c. testing sets were introduced for long years by means of a kenotron or a mechanical rectifier in combination with condensers.
The writer has recently constructed a mechanical rectifier for this purpose and studied the characteristics of this equipment.
The features of the paper are as follows:-