Meaningful Measurements to Assess Transformer Noise
Electric transformers are situated where electric power is used – frequently, close to people. Due to their hum and the noise of cooling fans they may cause intrusive noise levels.
A noise impact assessment (NIA) is therefor a useful tool to predict noise levels near third party stakeholders, to assess their acceptability and to prevent future noise problems. The sound power level (PWL) provides necessary information to be used in such an assessment or compare transformers. Typically, the PWL for transformers is calculated from measurements using standards such as IEEEI standard C57.12.90-2010, “IEEE Standard Test Code for Liquid-Immersed Distribution, Power and Regulating Transformers”. That standard requires an elaborate number of individual measurements around a transformer and results in a single-number PWL, without taking potential directivity into account. The method may therefore not be the most suitable to provide the necessary data for the purpose of assessing the noise impact from transformers. This paper aims to compare the measurement procedure and results according to IEEEI standard C57.12.90-2010 to other relevant standards such as ISO 3744:2010 “Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane” or measurements at some distance, assuming the transformer as a point source.
Henk de Haan, Eur. Ing. INCE Bd. Cert.
(403) 836 8806
How to Cite
Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i) to publish, reproduce, distribute, display and store the Contribution;
ii) to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii) to exploit all subsidiary rights in the Contribution,
iv) to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v) to licence any third party to do any or all of the above.