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BS EN 60076-10:2016 – TC:2020 Edition

BS EN 60076-10:2016 – TC:2020 Edition

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Tracked Changes. Power transformers – Determination of sound levels

Published By Publication Date Number of Pages
BSI 2020 153
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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
93 English
CONTENTS
95 FOREWORD
97 INTRODUCTION
99 1 Scope
2 Normative references
100 3 Terms and definitions
102 4 Sound power for different loading conditions
4.1 General
103 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
105 5 Sound level measurement specification
106 6 Instrumentation, calibration and accuracy
107 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
108 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 ā‰„ 3 m
7.6 Dry-type transformers
7.7 Dry-type air-core reactors
109 8 Prescribed contour
110 9 Microphone positions
10 Calculation of the measurement surface area
10.1 Measurement surface area for measuring distances up to 30Ā m
10.2 Measurement surface area for measuring distances larger than 30Ā m
111 11 Sound measurement
11.1 Test conditions
11.1.1 Placement of test object
11.1.2 Test energisation options
112 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
113 11.2.3 Calculation of the spatially averaged sound pressure level
114 11.2.4 Validation of test measurements with respect to background noise
11.2.5 Calculation of environmental correction K
Tables
Table 1 ā€“ Test acceptance criteria
116 11.2.6 Final correction for steady-state background noise and test environment
Table 2 ā€“ Approximate values of the average acoustic absorption coefficient
117 11.3 Sound intensity method
11.3.1 General
11.3.2 Test procedure
118 11.3.3 Calculation of average normal sound intensity and sound pressure level
119 11.3.4 Measurement validation
11.3.5 Final correction based on P-IĀ index and direction flag
120 12 Determination of sound power level by calculation
13 Logarithmic addition and subtraction of individual sound levels
121 14 Far-field calculations for distances larger than 30Ā m
122 15 Presentation of results
124 Figures
Figure 1 ā€“ Typical microphone path / positions for sound measurement on transformers excluding cooling devices
125 Figure 2 ā€“ 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
126 Figure 3 ā€“ 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
127 Figure 4 ā€“ Typical microphone path / positions for sound measurement on cooling devices mounted on a separate structure spaced ā‰„ 3 m away from the principal radiating surface of the transformer
128 Figure 5 ā€“ Typical microphone positions for sound measurementon dry-type transformers without enclosures
129 Figure 6 ā€“ Principle radiating surface and prescribed contour of dry-type air-core reactors
130 Figure 7 ā€“ Environmental correction, K
131 Annex A (informative) Narrow-band and time-synchronous measurements
A.1 General considerations
A.2 Narrow-band measurement
A.2.1 General
132 A.2.2 Post processing of narrow-band measurements to exclude background noise
A.3 Time-synchronous averaging technique
133 Annex B (informative) Typical report of sound level determination
B.1 Sound pressure method
141 B.2 Sound pressure method ā€“ Appendix for the point-by-point procedure
142 B.3 Sound intensity method
150 B.4 Sound intensity method ā€“ Appendix for the point-by-point procedure
151 Bibliography

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