GB/T 28543-2021Noise measurement method on power capacitors (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 28543-2012 "Power Capacitor Noise Measurement Method", compared with GB/T 28543-2012, except for the structure In addition to adjustments and editorial changes, the main technical changes are as follows.

---Modified the scope of application (see Chapter 1, Chapter 1 of the 2012 edition);

---Updated normative reference documents (see Chapter 2, Chapter 2 of the 2012 edition);

---The terms "reference sound pressure", "measurement surface", "A-weighted sound pressure level" and "apparent directivity index" have been added, and the terms and definitions have been deleted "Measurement profile", "measurement surface", "fundamental power" and its definitions (see Chapter 3, see Chapter 3 of the 2012 edition);

---Modified the capacitor power injection requirements and deleted the current injection value regulations (see 4.1.1, 2012 edition 4.1.1);

---Added product layout and measurement conditions (see 4.4);

---Modified the measuring point layout and layout rules (see 4.5, 4.5 in the 2012 edition);

---Added the normative Appendix A "Microphone Arrangement on the Noise Measurement Surface of Power Capacitors" (see Appendix A);

---Added informative Appendix B "Power Capacitor Noise Test Example" (see Appendix B);

---Added references (see references).

1 Scope

This document describes the sound pressure level measurement method of the power capacitor unit, and to determine the sound power level of the power capacitor unit.

This document applies to shunt capacitor units for AC power systems with a nominal voltage of 1000V and above and a frequency of 50Hz or 60Hz.

Yuan, AC filter capacitor unit, DC filter capacitor unit. Refer to implementation for other power capacitor units.

This document does not apply to capacitors whose body height is less than 0.8m.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2900.16-1996 Electrical terminology power capacitor

GB/T 3241 Electroacoustic Octave and Fractional Octave Filter

GB/T 3767-2016 Acoustic sound pressure method to determine the sound power level and sound energy level of the noise source. Approximate free field above the reflective surface. Cheng Fa

GB/T 3785.1-2010 Electroacoustic Sound Level Meter Part 1: Specification

GB/T 3947-1996 Acoustic terminology

3 Terms and definitions

GB/T 2900.16-1996, GB/T 3767-2016 and GB/T 3947-1996 and the following terms and definitions apply In this document.