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GB/T 1094.10-2022Power transformers - Part 10: Determination of sound levels (English PDF)

电力变压器第10部分：声级测定

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 14, 2022

Implementation date

May 1, 2023

Scope

GB/T 1094.10-2022 is the English-translated version of 电力变压器第10部分：声级测定.

GB/T 1094.10-2022 is the Chinese standard "Power transformers - Part 10: Determination of sound levels". Its scope clause reads: This document describes the measurement of sound pressure and sound intensity to determine the sound performance of transformers, reactors and their installed cooling equipment rate.

Note. The term "transformer" in this document refers to "transformers and reactors". These methods are applicable to transformers and reactors conforming to GB/T 1094.1, GB/T 1094.6 and GB/T 18494 (all parts) to and the cooling equipment to which they are installed (whether they are mounted directly on the transformer or stand alone).

This document applies to noise measurements made at the factory. For measurements in the field, due to the presence of nearby objects (including other transformers) Therefore, the measurement conditions in the field are very different from those in the factory.

However, when noise measurements are required in the field, The general rules given in this document can be followed. Its clauses include terms and definitions.

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Document preview — GB/T 1094.10-2022

National Standard of the People's Republic of China

ICS: 29.180
Classification: K 41
Replacing: GB/T 1094.10-2003

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Sound power under different load conditions
4.1 General
4.2 No-load excitation sound power
4.3 Cooling equipment sound power
4.4 Load current sound power
5 Sound level measurement specification
6 Instrument Calibration and Accuracy
7 Reference emission surface
7.1 Overview
7.2 Transformers with or without cooling equipment
7.3 Transformers with protective enclosures with cooling equipment in them
7.4 Transformers with protective enclosure but with cooling outside the enclosure
7.6 Dry-type transformers
7.7 Dry air core reactor
8 Specify the contour line
9 Microphone position
10 Calculation of measured surface area
10.1 The measurement surface area with a measurement distance of not more than 30m
10.2 Measuring surface area with measuring distance greater than 30m
11 Sound level measurement
11.1 Test conditions
11.2 Sound pressure method
11.3 Sound intensity method
12 Determination of sound power level by calculation
13 Logarithm of individual sound levels plus or minus
14 Far-field calculation when the distance is greater than 30m
15 Expression of results
Appendix A (Informative) Narrowband Measurements and Time Synchronization Measurements
Appendix B (Informative) Typical Format of Sound Level Measurement Report

1 Scope

This document describes the measurement of sound pressure and sound intensity to determine the sound performance of transformers, reactors and their installed cooling equipment rate.

Note. The term "transformer" in this document refers to "transformers and reactors".

These methods are applicable to transformers and reactors conforming to GB/T 1094.1, GB/T 1094.6 and GB/T 18494 (all parts) to and the cooling equipment to which they are installed (whether they are mounted directly on the transformer or stand alone).

This document applies to noise measurements made at the factory. For measurements in the field, due to the presence of nearby objects (including other transformers)

Therefore, the measurement conditions in the field are very different from those in the factory. However, when noise measurements are required in the field,

The general rules given in this document can be followed.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 1094.1-2013 Power Transformers Part 1.General (IEC 60076-1.2011, MOD)

Note. There is no technical difference between the quoted content of GB/T 1094.1-2013 and IEC 60076-1.2011.

GB/T 3768-2017 Determination of sound power level and sound energy level of noise source by acoustic sound pressure method using the envelope measurement surface above the reflecting surface

Simple method of (ISO 3746.2010, IDT)

GB/T 3785.1 Electroacoustic Sound Level Meter Part 1.Specification (GB/T 3785.1-2010, IEC 61672-1..2002, IDT)

GB/T 3785.2 Electroacoustic Sound Level Meter Part 2.Type Evaluation Test (GB/T 3785.2-2010, IEC 61672-2.

2003, IDT)

GB/T 13499-2002 Application Guidelines for Power Transformers (IEC 60076-8.1997, MOD)

Note. There is no technical difference between the quoted content of GB/T 13499-2002 and the content of IEC 60076-8.1997.

GB/T 16404-1996 Determination of Sound Power Level of Noise Sources by Acoustic Sound Intensity Method Part 1.Measurement at Discrete Points (ISO 9614-1.1993, MOD)

Note. There is no technical difference between the quoted content of GB/T 16404-1996 and the quoted content of ISO 9614-1.1993.

GB/T 16404.2-1999 Determination of Sound Power Level of Noise Sources by Acoustic Sound Intensity Method Part 2.Scanning Measurement (GB/T 16404.2-1999, ISO 9614-2.1996, MOD)

Note. There is no technical difference between the quoted content of GB/T 16404.2-1999 and the quoted content of ISO 9614-2.1996.

GB/T 17561 Sound intensity measuring instrument with sound pressure microphone pair measurement (GB/T 17561-1998, IEC 61043.1993, IDT)

GB/T 36075.2 Acoustic Room Acoustic Parameters Measurement Part 2.Ordinary Room Reverberation Time (GB/T 36075.2-2018,

ISO 3382-2.2008, IDT)

3 Terms and Definitions

The terms and definitions defined in GB/T 1094.1-2013 and the following apply to this document.

GB/T 10228 | GB/T 8286 | GB 1094.1 | GB/T 1094.16 | GB/T 1094.7 | GB/T 1094.14 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 91 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60076 · ISO 3746.2010 · IEC 61672 · ISO 9614 · IEC 61043.1993 · ISO 3382

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