FOREWORD
1 Scope
2 Normative references
3 Basic physics of sound
4 Sources and characteristics of transformer and reactor
sound
5 Measuring principles
6 Comparison of measuring methods
7 Practical aspects of making sound measurements
8 Difference between factory tests and field sound level
measurements
9 Specifying transformer and reactor sound levels
Annex A (informative) - Worked example: Power transformer
with cooling auxiliaries mounted on a separate
structure >3 m from the principal radiating surface
of the transformer - Sound power level determined
via sound pressure method
Annex B (informative) - Worked example: Distribution
transformer, sound power determined via
time-synchronous sound intensity method