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

drafted.

This document is part 10 of GB/T 1094 "Power Transformers". GB/T 1094 has released the following parts.

--- Part 1.General;

--- Part 2.Temperature rise of liquid-immersed transformers;

--- Part 3.Insulation levels, insulation tests and air gaps for external insulation;

--- Part 4.Lightning impulse and operating impulse test guidelines for power transformers and reactors;

--- Part 5.Ability to withstand short circuits;

--- Part 6.Reactors;

--- Part 7.Loading guidelines for oil-immersed power transformers;

--- Part 10.Sound level determination;

--- Part 10.1.Application Guidelines for Sound Level Determination;

--- Part 11.Dry-type transformers;

--- Part 12.Loading guidelines for dry-type power transformers;

--- Part 14.Liquid-immersed power transformers using high-temperature insulating materials;

--- Part 15.Gas-filled power transformers;

--- Part 16.Transformers for wind power generation;

--- Part 18.Frequency response measurement;

--- Part 23.DC bias suppression device.

This document replaces GB/T 1094.10-2003 "Power Transformers - Part 10.Determination of Sound Levels", and GB/T 1094.10-2003

In contrast, except for structural adjustments and editorial changes, the main technical changes are as follows.

--- Added some terms and definitions (see Chapter 3);

--- Added sound level measurement of distribution transformers (see Chapter 4, Chapter 5 and Chapter 8);

--- Added new sound level measurement specifications (see Chapter 5);

--- Except for distribution transformers, 1/3 octave measurement has been added (see Chapter 5);

--- Increased the height of the measurement surface to be calculated from the reflection plane (see Chapters 7 and 11);

--- Added sound level measurement principles for dry reactors (see Chapters 7 and 8);

--- Except for distribution transformers, the standard measurement distance is modified from 0.3m to 1m (see Chapter 8, Chapter 8 of the.2003 edition);

--- Unify the calculation formula for measuring surface area (see Chapter 10);

--- Added the amendment criterion of the sound intensity method (see Chapter 11);

--- Adjusted the relevant drawings (see full text).

This document is modified to adopt IEC 60076-10.2016 "Power Transformers - Part 10.Determination of Sound Levels".

The technical differences between this document and IEC 60076-10.2016 and their reasons are as follows.

--- Replace IEC 61672-1 with the normatively quoted GB/T 3785.1 to adapt to the technical conditions of our country;

--- Replace IEC 61672-2 with the normatively quoted GB/T 3785.2 to adapt to the technical conditions of our country;

--- Replace ISO 61043.1993 with the normatively quoted GB/T 17561 to adapt to the technical conditions of our country;

--- Replace ISO 3382-2.2008 with the normatively quoted GB/T 36075.2 to adapt to the technical conditions of our country.

The following editorial changes have been made to this document.

--- Added reference to GB/T 1094.6 in paragraph 2 of the scope, and adjusted the IEC 60076 series of standards to GB/T 1094.1;

--- The content of the introduction has been improved, and the last sentence in the last paragraph of the introduction has been deleted;

--- References have been adjusted.

Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents.

Introduction

The formulation of power transformer standards is to establish a set of best evaluation criteria for power transformers, and to select raw materials for power transformers.

Provide guidance on matters needing attention in selection, design, production, inspection, selection, operation, maintenance, etc. The GB/T 1094 series of standards aim to ensure that

Principles and related rules that are immediately applicable to the design, manufacture, test, operation, maintenance, etc. of power transformers. It is planned to consist of 16 parts.

constitute.

--- Part 1.General. The purpose is to establish the rules applicable to the design, manufacture and production test of various types of power transformers.

General principles and related rules.

--- Part 2.Temperature rise of liquid immersed transformers. The purpose is to establish the relevant temperature rise aspects applicable to various types of liquid immersed power transformers.

technical requirements and test methods.

--- Part 3.Insulation level, insulation test and external insulation air gap. The purpose is to establish suitable for various types of liquid immersed power transformers

Technical requirements and insulation test methods for insulation levels, insulation tests and external insulation air gaps.

--- Part 4.Lightning impulse and operating impulse test guidelines for power transformers and reactors. The purpose is to establish

Technical requirements and test methods for lightning impulse testing and operational impulse testing of power transformers and reactors.

--- Part 5.Ability to withstand short circuits. The purpose is to establish the relevant specifications applicable to various types of power transformers regarding their ability to withstand short circuits.

Technical requirements and test methods.

--- Part 6.Reactors. The purpose is to establish technical requirements and test requirements applicable to various types of reactors.

--- Part 7.Loading guidelines for oil-immersed power transformers. The purpose is to carry out the operation of various types of oil-immersed power transformers with load.

provide guidance.

--- Part 10.Sound level determination. The purpose is to establish techniques applicable to the determination of sound levels of various types of power transformers and reactors.

technical requirements and test methods.

--- Part 10.1.Application guidelines for sound level determination. The purpose is to measure the application method of sound level related to various power transformers and reactors.

provide guidance.

--- Part 11.Dry-type transformers. The purpose is to establish technical requirements and test requirements applicable to various types of dry-type power transformers.

--- Part 12.Dry-type power transformer load guidelines. The purpose is to improve various types of dry-type power transformers related to load operation.

for guidance.

--- Part 14.Liquid-immersed power transformers using high-temperature insulating materials. The purpose is to establish suitable for various types of high temperature insulation

Technical requirements and test requirements for materials of liquid immersed transformers.

--- Part 15.Gas-filled power transformers. The purpose is to establish technical requirements and tests applicable to various types of gas-filled power transformers.

inspection requirements.

--- Part 16.Transformers for wind power generation. The purpose is to establish the technical requirements and tests applicable to various types of wind power transformers.

inspection requirements.

--- Part 18.Frequency response measurements. The purpose is to establish technical requirements applicable to various types of power transformers related to frequency response.

Summation test method.

--- Part 23.DC bias suppression device. The purpose is to establish the technical requirements and tests applicable to various types of DC bias suppression devices.

inspection requirements.

GB/T 1094 clarifies the technical content of various power transformers and reactors and other products through 16 parts, and gives specific technical

Technical requirements, test items, test procedures, test methods and operation instructions, etc. By establishing clear scope, terminology, technical requirements for various products

and test requirements, etc., so that personnel engaged in related product design, production, testing, use and operation and maintenance can more clearly and accurately

operation, thus laying the foundation for the design and manufacture of high-quality products, better promoting trade, exchanges and technical cooperation, and for my country's power grid

normal operation is guaranteed.

This document gives the sound level specification and test under different load conditions in order, and how to evaluate and report the sound level of the equipment through the test.

See Chapter 5 for new additions to the sound level measurement specification.

This document introduces the definition of "distribution transformer", which reflects the factory's need for simple and fast measurement of the sound level of such transformers.

All sound level (including background noise) measurements of equipment installed in substations have increased 1/3 octave spectrum measurements, reflecting the

The new requirements of the planning and design units for the users also put forward new requirements for the functions of the measuring instruments.

There has been little experience with the introduction of the sound intensity method before. After years of implementation, it is necessary to modify with the rich practical experience.

need. This document describes the equivalence of the sound pressure method and the sound intensity method under certain test constraints.

The introduction of the new sound intensity method validity criterion recognizes the limitations of previous experience. The allowable pressure-intensity index deltaL is still 8dB, while the measured

The difference between the measured sound pressure level and the reported sound intensity level is limited to 4dB.

For the sound pressure method, the correction of sound reflection is strengthened, and the frequency-dependent K obtained by measuring the reverberation time of the laboratory should be used.

value. If the K value is derived from the sound absorption coefficient table, the average sound absorption coefficient should reasonably reflect the surface condition of the working environment.

The walking measurement method and the point-by-point measurement method are also applicable. Walk measurements reflect technological advances in engineering practice, making measurements even higher

efficient, especially for large equipment. For distribution transformers and for health and safety reasons, point-by-point measurements are more applicable.

In order to reduce the near-field effect, the reference measurement distance is set to 1m. However, for distribution transformers, limited test sites, and low signal-to-noise ratios

Conditions and for health and safety reasons, the measurement distance is maintained at 0.3m.

Due to the complexity of the previous measurement surface area calculation formula, the difference in results is often less than 1dB, so the measurement surface area S will be measured.

The calculations are unified into a single formula.

All graphs depicting the measured surface area have been modified according to the envelope method for determining sound power levels. The height h is from the ground where the test product is located

Regardless of whether there is support under the test object, unless the test object is mounted on a support structure of sufficient size, the surface of the support structure can not be used.

as a reflective surface.

The method of determining the measurement surface area and the reference profile of several dry reactors is explained with a schematic diagram.

When using this document, reference should be made to the corresponding application guideline IEC 60076-10-1.2016, as this can help with important background information

and understanding of details.

Power transformers part 10. sound level determination

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.