1 Scope
2 References
3 Sources of sound
3.1 General characteristics
3.2 Transformers
3.3 Shunt reactors
3.4 Fans and pumps
4 Factors affecting sound levels in field operation
4.1 Load power factor
4.2 Loading beyond nameplate rating
4.3 Harmonics
4.4 DC magnetization
4.5 Resonances
5 Factory-installed sound abatement methods
5.1 Typical design methods for sound abatement
5.2 Other factory-installed sound abatement methods
6 Field-installed sound abatement methods
6.1 Typical field-installed sound abatement methods
6.2 Other field-installed sound abatement methods
7 Active sound cancellation
7.1 Sound cancellation on or near the tank
7.2 Other active sound cancellation techniques
8 Useful sound level information
8.1 Sound pressure level
8.2 Sound power level
8.3 A-weighting sound scale
8.4 Sound level calculations
Annex A (informative) Bibliography
Annex B (informative) Estimation of far-field transformer
sound levels