IEEE DRAFT C57.136 : D12 MAY 2000

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

Gives guidelines for selecting suitable methods for sound reduction in liquid-immersed power transformers and shunt reactors rated over 500 kVA.