Power apparatus and electric machines
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- Electrical and electronic engineering [78]
- Power systems and applications [78]
- Power apparatus and electric machines [78]
- Transformers and reactors [30]
- Switchgear [24]
- Instrumentation and special applications [23]
- Power networks and systems [17]
- a.c. machines [14]
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- Measurement equipment and instrumentation systems [9]
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- http://iet.metastore.ingenta.com/content/subject/b7100,http://iet.metastore.ingenta.com/content/subject/b7130,http://iet.metastore.ingenta.com/content/subject/b8140,http://iet.metastore.ingenta.com/content/subject/b2800,http://iet.metastore.ingenta.com/content/subject/b2830,http://iet.metastore.ingenta.com/content/subject/b7250,http://iet.metastore.ingenta.com/content/subject/b7250g,http://iet.metastore.ingenta.com/content/subject/b8310d,http://iet.metastore.ingenta.com/content/subject/b0000,http://iet.metastore.ingenta.com/content/subject/b2100,http://iet.metastore.ingenta.com/content/subject/b7300,http://iet.metastore.ingenta.com/content/subject/b8120,http://iet.metastore.ingenta.com/content/subject/b8120j,http://iet.metastore.ingenta.com/content/subject/b8375,http://iet.metastore.ingenta.com/content/subject/b0500,http://iet.metastore.ingenta.com/content/subject/b0590,http://iet.metastore.ingenta.com/content/subject/b7320,http://iet.metastore.ingenta.com/content/subject/b7320g,http://iet.metastore.ingenta.com/content/subject/a,http://iet.metastore.ingenta.com/content/subject/a4000,http://iet.metastore.ingenta.com/content/subject/a4300,http://iet.metastore.ingenta.com/content/subject/b1000,http://iet.metastore.ingenta.com/content/subject/b1100,http://iet.metastore.ingenta.com/content/subject/b2140,http://iet.metastore.ingenta.com/content/subject/b2180,http://iet.metastore.ingenta.com/content/subject/b2180b,http://iet.metastore.ingenta.com/content/subject/b5000,http://iet.metastore.ingenta.com/content/subject/b5100,http://iet.metastore.ingenta.com/content/subject/b8130,http://iet.metastore.ingenta.com/content/subject/b8320,http://iet.metastore.ingenta.com/content/subject/c,http://iet.metastore.ingenta.com/content/subject/c3000,http://iet.metastore.ingenta.com/content/subject/b0100,http://iet.metastore.ingenta.com/content/subject/b7210,http://iet.metastore.ingenta.com/content/subject/b7210f,http://iet.metastore.ingenta.com/content/subject/b7310,http://iet.metastore.ingenta.com/content/subject/b8310e,http://iet.metastore.ingenta.com/content/subject/c3200,http://iet.metastore.ingenta.com/content/subject/c3300
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- 1949 [78]
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- A. Langley Morris [5]
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A new technique is described whereby a recurrent-surge indication of the inherent restriking transient in either dead or live power networks can be obtained. The principle underlying this technique, which may be called a “half-wave injection” method, is explained, and a few illustrative laboratory records are given. The surge produced is of the order of a hundred volts, depending on the magnitude of the system inductance and the current rating of the required rectifier unit.
The paper presents a theory of the stator-fed a.c. commutator machine with fixed brushes and induction regulator to provide the variable voltage and/or phase-shifting effect in the rotor circuit for both shunt and series connection. Circle diagrams are developed using a minimum of mathematical treatment without, however, sacrificing accuracy, whilst a maximum of conclusions useful in practice are drawn. A number of regulator systems of known and recently developed design are also described.
Although the impulse voltage testing of transformers has long been recognized as a necessity, to ensure satisfactory design, there has hitherto been no entirely satisfactory method for detecting the occurrence, during such tests, of insulation failures—particularly of the type which impulse tests are especially liable to produce; namely between sections or between turns of the winding. Attention is drawn to a new fault-detection technique recently proposed in the U.S.A., and a summary is given of published information on this subject from various American and European sources.Details are presented of some exploratory experimental work done by the authors, with a view to ascertaining the usefulness of the new technique, and a brief outline is given of the theoretical principles on which it depends. This is followed by a review of the authors' experiences in the practical application of the new methods to the routine impulse testing of 3-phase power transformers over a period of about 2 years. The various practical difficulties encountered are discussed, and means by which they may be avoided are indicated. Tentative test circuits for various types of 3-phase transformers are proposed.It is concluded that the technique described permits the condition of the transformer after impulse tests to be established with confidence. In the authors' opinion the results obtained merit the introduction of the new technique as a standard procedure in the impulse testing of transformers.
