469-1977 IEEE Recommended Practice for Voice-Frequency Electrical-Noise Tests of Distribution Transformers

inactive - Superseded by 469-1988
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Organization: IEEE - Institute of Electrical and Electronics Engineers, Inc.
Publication Date: 29 July 1977
Status: inactive
Page(s): 1 - 16
ISBN (Online): 978-1-5044-0358-0
DOI: 10.1109/IEEESTD.1977.7422636

Abstracts

Regular

The practice described herein provides instruction on the testing of distribution transformers as voice-frequency noise generators, to measure the degree to which they may contribute to electrical noise in communication circuits that are in parallel with the power-supply circuits serving the transformers. Transformers have a characteristic common to other iron-core devices of causing harmonic currents at voice frequencies to flow in supply circuits to the transformers. The magnitudes of these currents, and of interference that may result, vary according to design of the transformer as well as excitation voltage. The tests described in this practice provide a standard method for use by the transformer manufacturer, user, and others in industry for the purpose of better evaluating the design choices available and moving toward industry objectives as to levels of harmonic exciting current expressed as I-T (current X telephone influence factor [TIF] ).

Document History

469-1988 - IEEE Recommended Practice for Voice-Frequency Electrical-Noise Tests of Distribution Transformers
December 29, 1988 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Instruction for the testing of distribution transformers as sources of voice-frequency noise for communication circuits is provided. The tests measure the degree to which a transformer may contribute to electrical noise in communication circuits that are physically paralleling the power-supply circu...

469-1977 - IEEE Recommended Practice for Voice-Frequency Electrical-Noise Tests of Distribution Transformers
July 29, 1977 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The practice described herein provides instruction on the testing of distribution transformers as voice-frequency noise generators, to measure the degree to which they may contribute to electrical noise in communication circuits that are in parallel with the power-supply circuits serving the transfo...

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