GB/T 32524.1-2016 English PDF

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GB/T 32524.1-2016: Acoustics -- Determination of sound power level and directivity character of power capacitor unit using sound pressure -- Part 1: Precision method for hemi-anechoic rooms
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 32524.1-2016	679	Add to Cart	6 days	Acoustics -- Determination of sound power level and directivity character of power capacitor unit using sound pressure -- Part 1: Precision method for hemi-anechoic rooms	Valid

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Basic data

Standard ID: GB/T 32524.1-2016 (GB/T32524.1-2016)
Description (Translated English): Acoustics -- Determination of sound power level and directivity character of power capacitor unit using sound pressure -- Part 1: Precision method for hemi-anechoic rooms
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 34,337
Date of Issue: 2016-02-24
Date of Implementation: 2016-09-01
Quoted Standard: GB/T 3241; GB/T 3785.1; GB/T 6882-2016; GB/T 15173; GB/T 16927.1; GB/T 20993; GB/T 20994; GB 26861-2011
Regulation (derived from): National Standard Announcement No
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the power capacitor unit (hereinafter referred to as the capacitor unit) in a semi-anechoic chamber (semi-anechoic chamber) by determining the sound power level and the direction of the capacitor cell by measuring the sound pressure level on the measuring surface surrounding the capacitor unit (GB/T 19052, Class 1 Accuracy) method for determining the accuracy of a characteristic. The test frequency range for this standard is the range covered by the 1/3 octave band with a center frequency of 100 Hz to 4000 Hz. The frequency range can be expanded or reduced as required, but the measurement environment should meet the frequency range requirements. This standard is applicable to AC filter capacitors, DC filter capacitors, shunt capacitors, etc. with a nominal voltage of 1kV and above. Other power capacitors may be referred to this standard.

GB/T 32524.1-2016: Acoustics -- Determination of sound power level and directivity character of power capacitor unit using sound pressure -- Part 1: Precision method for hemi-anechoic rooms

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Acoustics.Determination of sound power level and directivity character of power capacitor unit using sound pressure.Part 1. Precision method for hemi-anechoic rooms ICS 17.140 A59 National Standards of People's Republic of China Acoustic pressure measurement of power capacitor units Sound power level and pointing characteristics Part 1. semi - anechoic chamber precision method Acoustics-Determination ofsoundpowerlevelanddirectivitycharacter Part 1. Precisionmethodforhemi-anechoicrooms 2016-02-24 released 2016-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released Directory Preface III Introduction IV 1 Scope 1 2 normative reference document 1 3 Terms and definitions 1 4 Meteorological conditions 4 5 test environment and requirements 4 Equipment and equipment requirements 5 7 Installation requirements for capacitor units 6 8 Capacitor Unit Loading 7 9 Measuring surface and measuring point position 9 Measurement and calculation of sound pressure level 11 Calculation of sound power level 12 Calculate and represent the characterization Measurement Uncertainty 13 14 record content 14 Appendix A (Normative Appendix) Calculate A-weighted sound power level with 1/3 octave sound power level Appendix B (informative) Guidelines for measuring uncertainty Appendix C (informative) Capacitor units Sound power level and pointing characteristics Measurement record table 26 Reference 27

Foreword

GB/T 32524 "Acoustic sound pressure measurement of the power capacitor unit of the sound power level and pointing characteristics" contains the following two parts. - Part 1. semi - anechoic chamber precision method; Part 2. Engineering method for approximate free field above the reflective surface. This part is part 1 of GB/T 32524. This part is drafted in accordance with the rules given in GB/T 1.1-2009. Please note that some of the contents of this document may involve patents. The issuer of this document does not assume responsibility for the identification of these patents. This part is presented by the Chinese Academy of Sciences. This section is under the jurisdiction of the National Acoustics Standardization Technical Committee (SAC/TC17). This part of the drafting unit. Southern Power Grid Scientific Research Institute limited liability company, Hefei University of Technology, Guilin Power Capacitor Co., Ltd. Division, Shenzhen Ya Ya Electrical and Mechanical Industry Co., Ltd., Institute of Acoustics, Chinese Academy of Sciences, Beijing Institute of Labor Protection Science, Zhejiang University. This part of the main drafters. Huang Ying, Li Zhiyuan, Fang Qingchuan, Cheng Mingkun, Liang Cong, Lu Yadong, Li Xiaodong, Li Xiaokuan, Kuang Dongwei, Lu Yimin, Chen Zhang bit.

Introduction

In order to be able to conduct a unified evaluation and comparison of the noise emitted by the power capacitor and to design the noise of the specific project of the power system And the control provided basis, this part of the provisions in the semi-free field (semi-anechoic chamber) environment, the use of sound pressure measurement of power capacitor unit in the project Requirements of the working conditions under the conditions of the noise of the sound power level and the characteristics of the precision level method. This section focuses on power capacitor cell noise The requirements of the test environment, the installation conditions, the measurement surface and the measuring point arrangement, as well as the simulation of the actual working conditions, etc. are given specific provisions, To ensure that this part of the measurement can meet the GB/T 19052 provides the precise level (level 1) requirements. The method specified in this section measures the sound power level and expression orientation characteristics of the power capacitor unit using the band sound level or the A-weighted sound level. The method given in this section requires that the capacitor unit be installed in a semi-anechoic chamber with specified acoustic characteristics, such as in an anechoic chamber Set, can refer to GB/T 6882-2016 standard requirements. According to the method of this part of the measured sound power level and pointing characteristics can be used for power capacitor unit noise research, noise level comparison With evaluation. Acoustic pressure measurement of power capacitor units Sound power level and pointing characteristics Part 1. semi - anechoic chamber precision method

1 Scope

This part of GB/T 32524 specifies the power capacitor unit (hereinafter referred to as. capacitor unit) in a semi-free field environment (semi-silencer Chamber) by determining the sound pressure level measured on the measurement surface surrounding the capacitor unit to determine the precision of the sound level and the direction of the capacitor unit Level (GB/T 19052 level 1 accuracy) method. The test frequency range in this section is the range in which the center frequency is covered by the 1/3 octave band of 100 Hz to 4000 Hz. base on needs, The frequency range can be expanded or reduced, but the measurement environment should meet the frequency range requirements. This part applies to the nominal voltage 1kV and above the AC filter capacitors, DC filter capacitors, shunt capacitors, other electricity Force capacitors can be specified with this section.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 3241 electroacoustics octave and fractional octave filters Electroacoustics - Sound level gauges - Part 1. Specifications GB/T 6882-2016 Acoustic sound pressure method for the determination of noise sources of sound power and acoustic energy level of anechoic chamber and semi-anechoic chamber precision method GB/T 15173 electroacoustic sound calibrator High voltage test technology - Part 1. General definitions and test requirements GB/T GB/T 20993 DC Filter Capacitor and Neutral Bus Impact Capacitor for HVDC System GB/T 20994 HVDC system with parallel capacitors and AC filter capacitors Safety rules for electrical safety - Part

3 terms and definitions

The following terms and definitions apply to this document. 3.1 Sound pressure soundpressure The difference between instantaneous pressure and static pressure. Note. The sound pressure unit is Pa (Pa). [GB/T 6882-2016, definition 3.1] 3.2 Time average sound pressure level time-averagedsoundpressurelevel Lp, T At the specified duration interval T (starting at t1, terminating in t2), the ratio of the mean value of the sound pressure p square to the square of the reference value ......

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