BS EN 60076-10:2016
$198.66
Power transformers – Determination of sound levels
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 66 |
IEC 60076-10:2016 defines sound pressure and sound intensity measurement methods from which sound power levels of transformers, reactors and their associated cooling devices are determined. The methods are applicable to transformers, reactors and their cooling devices – either fitted to or separate from the transformer – as covered by the IEC 60076 and IEC 61378 series. This standard is primarily intended to apply to measurements made at the factory. Conditions on-site can be very different because of the proximity of objects, including other transformers. Nevertheless, this standard is applied to the extent possible for on site measurements. This edition includes the following significant technical changes with respect to the previous edition: – additional useful definitions introduced; – definition of distribution type transformers introduced for the purpose this standard; – new clause for sound level measurement specification introduced; – requirement for 1/3 octave band measurements introduced for transformers other than distribution type transformers; – standard measurement distance changed from 0,3 m to 1 m for transformers other than distribution type transformers; – height of measurement surface is now clearly defined to count from the reflecting plane; – measurement surface formula unified; – correction criteria for intensity method introduced; – rules for sound measurements on dry-type reactors introduced; – figures revised; – new informative test report templates introduced (Annex B); – IEC 60076-10-1 (application guide) revised in parallel providing worthwhile information for the use of this standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 8 | FOREWORD |
| 10 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references |
| 13 | 3 Terms and definitions |
| 15 | 4 Sound power for different loading conditions 4.1 General |
| 16 | 4.2 Sound power at no-load excitation 4.3 Sound power of the cooling device(s) 4.4 Sound power due to load current |
| 18 | 5 Sound level measurement specification |
| 19 | 6 Instrumentation, calibration and accuracy |
| 20 | 7 Principal radiating surface 7.1 General 7.2 Transformers with or without cooling device 7.3 Transformers in enclosures with cooling devices inside the enclosure |
| 21 | 7.4 Transformers in enclosures with cooling devices outside the enclosure 7.5 Cooling devices mounted on a separate structure where the distance between the two principal radiating surfaces is ≥ 3 m 7.6 Dry-type transformers 7.7 Dry-type air-core reactors |
| 22 | 8 Prescribed contour |
| 23 | 9 Microphone positions 10 Calculation of the measurement surface area 10.1 Measurement surface area for measuring distances up to 30 m 10.2 Measurement surface area for measuring distances larger than 30 m |
| 24 | 11 Sound measurement 11.1 Test conditions 11.1.1 Placement of test object 11.1.2 Test energisation options |
| 25 | 11.1.3 Test application details 11.1.4 Prevailing ambient conditions 11.2 Sound pressure method 11.2.1 General 11.2.2 Test procedure |
| 26 | 11.2.3 Calculation of the spatially averaged sound pressure level |
| 27 | 11.2.4 Validation of test measurements with respect to background noise 11.2.5 Calculation of environmental correction K Tables Table 1 – Test acceptance criteria |
| 29 | 11.2.6 Final correction for steady-state background noise and test environment Table 2 – Approximate values of the average acoustic absorption coefficient |
| 30 | 11.3 Sound intensity method 11.3.1 General 11.3.2 Test procedure |
| 31 | 11.3.3 Calculation of average normal sound intensity and sound pressure level |
| 32 | 11.3.4 Measurement validation 11.3.5 Final correction based on P-I index and direction flag |
| 33 | 12 Determination of sound power level by calculation 13 Logarithmic addition and subtraction of individual sound levels |
| 34 | 14 Far-field calculations for distances larger than 30 m |
| 35 | 15 Presentation of results |
| 37 | Figures Figure 1 – Typical microphone path / positions for sound measurement on transformers excluding cooling devices |
| 38 | Figure 2 – Typical microphone path / positions for sound measurement on transformers having cooling devices mounted either directly on the tank or on a separate structure spaced < 3 m away from the principal radiating surface of the main tank |
| 39 | Figure 3 – Typical microphone path / positions for sound measurement on transformers having separate cooling devices spaced < 3 m away from the principal radiating surface of the main tank |
| 40 | Figure 4 – Typical microphone path / positions for sound measurement on cooling devices mounted on a separate structure spaced ≥ 3 m away from the principal radiating surface of the transformer |
| 41 | Figure 5 – Typical microphone positions for sound measurementon dry-type transformers without enclosures |
| 42 | Figure 6 – Principle radiating surface and prescribed contour of dry-type air-core reactors |
| 43 | Figure 7 – Environmental correction, K |
| 44 | Annex A (informative) Narrow-band and time-synchronous measurements A.1 General considerations A.2 Narrow-band measurement A.2.1 General |
| 45 | A.2.2 Post processing of narrow-band measurements to exclude background noise A.3 Time-synchronous averaging technique |
| 46 | Annex B (informative) Typical report of sound level determination B.1 Sound pressure method |
| 54 | B.2 Sound pressure method – Appendix for the point-by-point procedure |
| 55 | B.3 Sound intensity method |
| 63 | B.4 Sound intensity method – Appendix for the point-by-point procedure |
| 64 | Bibliography |
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