Transient characteristics of a laboratory universal machine operating as an alternator
作者:
D.P.Sen Gupta,
J.W.Lynn,
期刊:
Proceedings of the Institution of Electrical Engineers
(IET Available online 1965)
卷期:
Volume 112,
issue 8
页码: 1549-1556
年代: 1965
DOI:10.1049/piee.1965.0252
出版商: IEE
数据来源: IET
摘要:
The paper describes experimental results obtained from transient tests on a laboratory universal machine, connected to operate as a 3-phase alternator. During these tests, which were carried out in order to measure the parameters, severe harmonic distortion was found in the armature-current waveform under conditions of sudden symmetrical short circuit. This appeared to be mainly second and third harmonic together with a very low-frequency subharmonic. The paper gives an analysis of the machine with computed values of transient current and shows that, with the compromise design used to achieve a measure of generalisation, such harmonics are to be expected. It also shows mathematically that the usual transient d.c. component in the armature current may become a transient, very-low-frequency oscillation, depending on the machine parameters.These effects observed on a ‘universal machine’ were also found during tests carried out on a second generalised machine of different design.It was found that damping and field time constant have considerable effect on the transient harmonic distortion in the short-circuit armature current.
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