IEC/IEEE 62271-37-082:2012
(Main)High-voltage switchgear and controlgear - Part 37-082: Standard practice for the measurement of sound pressure levels on alternating current circuit-breakers
High-voltage switchgear and controlgear - Part 37-082: Standard practice for the measurement of sound pressure levels on alternating current circuit-breakers
IEC/IEEE 62271-37-082:2012(E) provides methods for the measurement of sound pressure level produced by outdoor alternating current circuit-breakers in a free-field environment. These methods may also be used indoors or in restricted field, provided that precautions are observed in the measurement and interpretation of the results. This standard has been prepared by subcommittee 17A: High-voltage switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear, in cooperation with the Switchgear Committee of the IEEE Power & Energy Society, under the IEC/IEEE Dual Logo Agreement between IEC and IEEE. The contents of the corrigendum of January 2014 have been included in this copy.
General Information
Standards Content (sample)
IEC/IEEE 62271-37-082
Edition 1.0 2012-10
INTERNATIONAL
STANDARD
High-voltage switchgear and controlgear –
Part 37-082: Standard practice for the measurement of sound pressure levels on
alternating current circuit-breakers
IEC/IEEE 62271-37-082:2012(E)
---------------------- Page: 1 ----------------------
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IEC/IEEE 62271-37-082
Edition 1.0 2012-10
INTERNATIONAL
STANDARD
High-voltage switchgear and controlgear –
Part 37-082: Standard practice for the measurement of sound pressure levels on
alternating current circuit-breakers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
ICS 29.130.10 ISBN 978-2-83220-406-1
Warning! Make sure that you obtained this publication from an authorized distributor.
---------------------- Page: 3 ----------------------– 2 – 62271-37-082 © IEC/IEEE:2012(E)
CONTENTS
FOREWORD ........................................................................................................................... 4
1 Scope ............................................................................................................................... 6
2 Terms and definitions ....................................................................................................... 6
3 Acoustical environment .................................................................................................... 9
3.1 Ambient noise ......................................................................................................... 9
3.2 Wind conditions ....................................................................................................... 9
3.3 Air condition ............................................................................................................ 9
3.4 Local topography ..................................................................................................... 9
4 Instrumentation .............................................................................................................. 10
4.1 Sound level meter ................................................................................................. 10
4.1.1 General ..................................................................................................... 10
4.1.2 Preferred sound level meter....................................................................... 10
4.1.3 Peak and time average .............................................................................. 10
4.2 Calibration capability ............................................................................................. 10
4.3 Supplemental instrumentation ............................................................................... 10
5 Type test methods .......................................................................................................... 10
5.1 General test requirements ..................................................................................... 10
5.1.1 General ..................................................................................................... 10
5.1.2 Sound pressure level measurements ......................................................... 10
5.1.3 No load conditions ..................................................................................... 11
5.1.4 Impulse noise measurement ...................................................................... 11
5.1.5 Location of microphone ............................................................................. 11
5.1.6 Orientation of microphone ......................................................................... 11
5.2 Near-field measurements ...................................................................................... 11
5.2.1 Type of noise measurements ..................................................................... 11
5.2.2 Near field measurement with fully opened doors ........................................ 12
5.2.3 Near field measurement with fully closed doors ......................................... 12
5.3 Far-field measurements ......................................................................................... 12
5.3.1 Type of noise measurements ..................................................................... 12
5.3.2 Far field measurement ............................................................................... 13
5.3.3 Equivalent data ......................................................................................... 14
5.4 Data ...................................................................................................................... 14
5.4.1 General ..................................................................................................... 14
5.4.2 Circuit-breaker being tested ....................................................................... 14
5.4.3 Environment .............................................................................................. 15
5.4.4 Instrumentation.......................................................................................... 15
5.4.5 Acoustical data .......................................................................................... 15
5.4.6 Miscellaneous ............................................................................................ 15
5.5 Report ................................................................................................................... 15
5.5.1 Completeness of the report........................................................................ 15
5.5.2 Conversion ................................................................................................ 15
6 Field test methods .......................................................................................................... 17
6.1 General ................................................................................................................. 17
6.2 Wind conditions ..................................................................................................... 17
6.3 Circuit-breaker operating conditions ...................................................................... 17
6.3.1 Operating conditions .................................................................................. 17
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6.3.2 Specific conditions..................................................................................... 17
6.3.3 Measurements ........................................................................................... 17
6.4 Microphone locations ............................................................................................ 17
7 Measurements to be taken ............................................................................................. 18
7.1 Limitation of the measurement .............................................................................. 18
7.2 Measurement of impulsive noise............................................................................ 18
7.3 Data and report ..................................................................................................... 18
Bibliography .......................................................................................................................... 19
Figure 1 – Location of measurement points with respect to the referenceparallelepiped for near field measurements ........................................................................... 12
Figure 2 – Location of measurement points with respect to circuit-breaker outline for
far field measurements ......................................................................................................... 14
Figure 3 – Measurement of sound pressure levels of a.c. circuit-breakers – Record
form ...................................................................................................................................... 16
Table 1 – Wind conditions for sound measurements ............................................................... 9
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 37-082: Standard practice for the measurement of sound
pressure levels on alternating current circuit-breakers
FOREWORD
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International Standard IEC/IEEE 62271-37-082 has been prepared by subcommittee 17A:
High-voltage switchgear and controlgear, of IEC technical committee 17: Switchgear and
controlgear, in cooperation with the Switchgear Committee of the IEEE Power & Energy
Society , under the IEC/IEEE Dual Logo Agreement between IEC and IEEE.This publication is published as an IEC/IEEE Dual Logo standard.
The text of this standard is based on the following IEC documents:
FDIS Report on voting
17A/1014/FDIS 17A/1023/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.International standards are drafted in accordance with the rules given in the ISO/IEC
Directives, Part 2.A list of all parts of the IEC 62271 series can be found, under the general title High-voltage
switchgear and controlgear, on the IEC website.The IEC Technical Committee and IEEE Technical Committee have decided that the contents
of this publication will remain unchanged until the stability date indicated on the IEC web site
under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this standard may be issued at a later date.
The contents of the corrigendum of January 2014 have been included in this copy.
—————————
A list of IEEE participants can be found at the following URL:
http://standards.ieee.org/downloads/62271-37-082/62271-37-082-2012/62271-37-082_wg-participants.pdf
---------------------- Page: 7 ----------------------– 6 – 62271-37-082 © IEC/IEEE:2012(E)
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 37-082: Standard practice for the measurement of sound
pressure levels on alternating current circuit-breakers
1 Scope
This part of International Standard 62271 provides methods for the measurement of sound
pressure level produced by outdoor alternating current circuit-breakers in a free-field
environment. These methods may also be used indoors or in restricted field, provided that
precautions are observed in the measurement and interpretation of the results.2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
A-weighted sound level
sound level as measured on a sound level meter using a setting that emphasizes the middle
frequency components similar to the frequency response of the human ear at levels typical of
rural backgrounds in mid frequencies2.2
ambient noise
all noises that exist in an area that are not related to a facility or equipment under
considerationNote 1 to entry: Ambient noise includes sound from other industrial noise, transportation sources, animals, and
nature, etc.2.3
ambient sound level
ASL
sound level that is a composite of different airborne sounds from many sources far away from
and near the point of measurementNote 1 to entry: The ASL does not include any sound from the facility or equipment under consideration and is
measured without it.Note 2 to entry: The ASL is measured under representative conditions.
Note 3 to entry: As with comprehensive sound levels, representative conditions do not constitute absolute worst-
case conditions but conditions that portray typical conditions for the area2.4
bands
octave
1/3 octave
series of electronic filters separate sound into discrete frequency bands, making it possible to
know how sound energy is distributed as a function of frequencyNote 1 to entry: Each octave band has a centre frequency that is double the centre frequency of the octave band
preceding it. The 1/3 octave band analysis provides a finer breakdown of sound distribution as a function of
frequency.---------------------- Page: 8 ----------------------
62271-37-082 © IEC/IEEE:2012(E) – 7 –
2.5
C-weighted sound level
approximation of the sensitivity of human hearing at industrial noise levels (above about
85 dBA)Note 1 to entry: The C-weighted sound level (i.e., measured with the C-weighting) is more sensitive to sounds at
low frequencies than the A-weighted sound level and is sometimes used to assess the low-frequency content of
complex sound environments.2.6
calibration
procedure used for the adjustment of a sound level meter using a reference source of a
known sound pressure level and frequency2.7
decibel
unit of measure of sound pressure that compresses a large range of numbers into a more
meaningful scaleNote 1 to entry: Hearing tests indicate that the lowest audible pressure is about 2 × 10 Pa (0 dB), while the
sensation of pain is about 2 × 10 Pa (140 dB). Generally, an increase of 10 dB is perceived as twice as loud.
p p
Sound pressure level (dB) = 10 log = 20 log
2
0
where
p is the root-mean-square of the sound pressure (in Pa);
p is the reference root-mean-square-sound of the sound pressure, generally 2 × 10 Pa.
The decibel is a linear weighting and can also be used when referring to differences in weightings.
...
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