Table of Contents

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

Abstract

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

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN
Supersedes	IEEE DRAFT C57.136 : D12 MAY 2000