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

Status
Published
Publication Date
24-Oct-2012
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
25-Oct-2012
Completion Date
25-Oct-2012
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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
IEC/IEEE 62271-37-082:2012(E)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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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62271-37-082 © IEC/IEEE:2012(E) – 3 –

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 reference

parallelepiped 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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– 4 – 62271-37-082 © IEC/IEEE:2012(E)
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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---------------------- Page: 6 ----------------------
62271-37-082 © IEC/IEEE:2012(E) – 5 –

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 frequencies
2.2
ambient noise

all noises that exist in an area that are not related to a facility or equipment under

consideration

Note 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 measurement

Note 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 area
2.4
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 frequency

Note 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 frequency
2.7
decibel

unit of measure of sound pressure that compresses a large range of numbers into a more

meaningful scale

Note 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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