A Central Control Ground Locating System for Energized Shipboard Electrical Power Systems.
Abstract
The present method of locating grounds on normally ungrounded shipboard electrical power systems requires that branches of the circuit be switched off and on one at a time until the grounded circuit is located by observing indicator lights. Since it is vital that the power to much equipment on modern ships not be interrupted, an instrument system has been developed to obviate that requirement. It operates on the principle of superimposing a train of short, widely separated, current pulses of relatively fast rise time (1 millisecond or less), with distinctive signature, on a grounded energized power line and detecting these pulses inductively with a coil located close to the tested line. A detector amplifier and headset are provided. This is the latest phase in the development of an instrument begun at the former Naval Applied Science Laboratory, Brooklyn, New York. In contrast to previous models, it is centrally controlled and intended to be permanently installed, its control box being switchboard mounted. Laboratory investigations reveal that its behavior is similar to that of portable models evaluated previously on several ships with generally satisfactory results. Certain operating precautions to be taken in the course of shipboard evaluation are discussed and suggestions for later improvements are presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1970
- Accession Number
- AD0877279
Entities
People
- Ernest W. Fisher