GB/T 1094.11-2022Power transformers—Part 11: Dry-type transformers (English PDF)

Foreword

Chapter 1, Chapter 2, Chapter 3, Chapter 6, Chapter 33, Chapter 34 of this

part are recommended. The rest are mandatory.

GB 1094 "Power transformers" currently contains the following parts.

- Part 1.General;

-Part 2.Temperature rise;

- Part 3.Insulation levels, dielectric tests and external clearances in air;

- Part 4.Guide to the lightning impulse and switching impulse testing - Power

transformers and reactors;

- Part 5.Ability to withstand short circuit;

- Part 10.Determination of sound;

- Part 11.Dry-type transformers.

This part is Part 11 of GB 1094.The number of the previous version of this part

is GB 6450.The corresponding IEC standard number is IEC 60726.As the

standard numbers of IEC related power transformers are now adjusted to the

IEC 60076 series, in order to be in harmony with the IEC standard numbers

AND convenient to use, this revision also adjusts the standard numbers, based

on the new IEC standard series.

This part modifies and adopts IEC 60076-11.2004 "Power transformer - Part 11.

Dry-type transformer" (English version).

This part is redrafted in accordance with IEC 60076-11.2004 in accordance with

the redrafting principles. The numbering of the figure in this part is completely

consistent with IEC 60076-11.2004, whilst the numbering of some chapters,

clauses, tables are not completely consistent with IEC 60076-11.2004.The

comparison list is given in Appendix A.

Taking into account the current conditions of China, when adopting IEC 60076-

11.2004, some technical content has been modified in this part. The differences

have been incorporated into the main text AND marked with a vertical single

line in the margins of the clauses they involve. A list of these technical

differences and their reasons is given in Appendix B, for reference.

For ease of use, this part also makes the following editorial changes to IEC

60076-11.2004.

a) DELETE the forewords of IEC 60076-11.2004;

b) USE a decimal point ".", to replace the comma "," which was used as a

decimal point;

c) According to GB/T 1.1-2000 "Directives for standardization-Part 1.Rules

for the structure and drafting of standards", MODIFY the format of Table 1

in IEC 60076-11.2004.

This part replaces GB 6450-1986 "Dry-type power transformer".

Compared with GB 6450-1986, the main changes in this part are as follows.

- ADD the "Normative references";

- CANCEL the definitions of "dry-type transformers with encapsulated coils",

"dry-type transformers with non-encapsulated coils", "sealed dry-type

transformers";

- ADD some "conditions of use"; ADD "transportation and storage conditions";

- MODIFY the relevant provisions on the correction of temperature rise limit

and insulation level of transformers, which are used for special conditions

of use;

- MODIFY the rated short-time applied withstand voltage of the transformer,

which has a nominal system voltage of 10 kV;

- ADD the technical requirements, test items, test methods for "climate,

environment, combustion performance level";

- MODIFY the relevant technical requirements and test methods of "partial

discharge measurement";

- MODIFY the relevant requirements of the "temperature rise test";

- ADD the requirements for "protection against direct contact", "grounding

terminal", "installation and safety information".

Appendix A, Appendix B, Appendix C, Appendix D of this part are all informative

appendixes.

This part was proposed by the China Electrical Equipment Industry Association.

This part shall be under the jurisdiction of the National Transformer

Standardization Technical Committee (SAC/TC 44).

Drafting organizations of this part. Shenyang Transformer Research Institute,

Power transformers - Part 11.Dry-type transformers

1 Scope

This part of GB 1094 applies to dry-type power transformers (including

autotransformers), where the maximum voltage of the equipment is 40.5 kV and

below, AND at least one winding is operated at a temperature higher than 1.1

kV. This part applies to dry-type transformers of various structures and

processes.

This part does not apply to.

- Inflatable dry-type transformer (when the inflatable gas is not air);

- Single-phase transformer, which has a rated capacity of less than 5 kVA;

- Multi-phase transformer, which has a rated capacity of less than 15 kVA;

- Transducer;

- Starting transformer;

- Test transformer;

- Locomotive traction transformer;

- Flameproof and mining transformers;

- Welding transformer;

- Voltage regulating transformer;

- Small power transformers that focus on safety.

When the above-mentioned transformers or other special transformers do not

have corresponding standards, this part can be applied in whole or in part.

2 Normative references

The provisions in following documents become the provisions of this part

through reference in GB 1094.For the dated references, the subsequent

amendments (excluding corrections) or revisions do not apply to this part;

however, parties who reach an agreement based on this part are encouraged

to study if the latest versions of these documents are applicable. For undated

references, the latest edition of the referenced document applies.

GB 311.1 Insulation co-ordination for high voltage transmission and

distribution equipment (GB 311.1-1997, neq IEC 60071-1.1993)

GB 1094.1 Power transformers - Part 1.General (GB 1094.1-1996, eqv IEC

60076-1.1993)

GB 1094.2 Power transformers - Part 2.Temperature rise (GB 1094.2-1996,

eqv IEC 60076-2.1993)

GB 1094.3 Power transformers - Part 3.Insulation levels, dielectric tests and

external clearances in air (GB 1094.3-2003, IEC 60076-3.2000, MOD)

GB 1094.5 Power transformers - Part 5.Ability to withstand short circuit (GB

1094.5-2003, IEC 60076-5.2000, MOD)

GB/T 1094.10 Power transformers - Part 10.Determination of sound (GB/T

1094.10-2003, IEC 60076-10.2001, MOD)

GB/T 2900.15 Electrotechnical terminology - Transformer, instrument

transformer, voltage regulator and reactor (GB/T 2900.15-1997, neq IEC

60050-421.1990, IEC 60050-321.1986)

GB 4208 Degrees of protection provided by enclosure (IP code) (GB 4208-

1993, eqv IEC 60529.1989)

GB/T 7354 Partial discharge measurements (GB/T 7354-2003, IEC

60270.2000, IDT)

GB/T 11021 Thermal evaluation and classification of electrical insulation

(GB/T 11021-1989, eqv IEC 60085.1984)

GB/T 17211-1998 Loading guide for dry-type power transformers (eqv IEC

60905.1987)

GB/T 17467 High-voltage/low-voltage prefabricated substations (GB/T

17467-1998, eqv IEC 61330.1995)

GB/T 18380.3 Tests on electric cables under fire conditions - Part 3.Tests

on bunched wires or cables (GB/T 18380.3-2001, idt IEC 60332-3.1992)

3 Terms and definitions

The terms and definitions as defined in GB/T 2900.15, as well as the following

terms and definitions, apply to this part.

temperature rise test.