Published Resources Details
Journal Article
- Title
- A Static 150-Cycle Generator
- In
- Journal of the Institution of Engineers, Australia
- Imprint
- vol. 29, no. 3, Mar 1957, pp. 75-82
- Description
This paper, No.1266, originated in the Sydney Division of The Institution, and was submitted by the authors on 1Oth October 1955.
Dr. Geoffrey Builder PhD (non-member) is Senior Lecturer, School of Physics, University of Sydney. Dr. H. S. A. Rosenthal Dr.Ing(Berlin) MIEAust,is a Consulting Engineer.- Abstract
When a bank of single-phase transformers, or a three-phase shell-type transformer, has primaries star-connected to a three-phase mains supply, useful amounts of third-harmonic energy may be delivered to a load connected between the star-point and neutral, or to a load connected in series with delta-connected secondary windings; the two load connections are equivalent except in regard to winding losses. Distortion of the 150-cycle output voltage waveform is negligible when a simple filter is connected across the load. Utilisation of this filter to provide a capacitive reactance at 150 c/s, in parallel with the load, results in an increase in useful output power. A saturable reactor may be added to form a ferro-resonant circuit which provides a capactive reactance, at 150-cycles, which increases automatically as the load voltage decreases, resulting in improved regulation of the output voltage with load variations and with input-voltage variations. This improvement is particularly noticeable for low power factor loads. The arrangement described provides an economical 150-cycle generator, with fairly satisfactory characteristics for laboratory and general testing.