Scope
This part of GB 1094 applies to three-phase and single-phase power transformers (including auto-transformers) with the exception of certain categories of small and special transformers such as:
——single-phase transformers with rated power less than 1 kVA and three-phase transformers less than 5 kVA;
——transformers, which have no windings with rated voltage higher than 1000 V;
——instrument transformers;
——traction transformers mounted on rolling stock;
——starting transformers;
——testing transformers;
——welding transformers;
——explosion-proof and mining transformers;
——transformers for deep water (submerged) applications.
When some standards do not exist for such categories of transformers (in particular transformer having no winding exceeding 1000V for industrial applications), this part may still be applicable either as a whole or in part.
This part does not address the requirements that would make a transformer suitable for mounting in a position accessible to the general public.
For those categories of power transformers and reactors which have their own standards, this part is applicable only to the extent in which it is specifically called up by cross-reference in the other standard. Such standards exist for:
——reactors (GB/T 1094.6);
——dry-type transformers (GB 1094.11);
——self-protected transformers (IEC 60076-13);
——gas-filled power transformers (IEC 60076-15);
——transformers for wind turbine applications (GB 1094.16);
——traction transformers and traction reactors (GB/T 25120);
——converter transformers for industrial applications (GB/T 18494.1);
——converter transformers for HVDC applications (GB/T 18494.2).
At several places in this part it is specified or recommended that an 'agreement' should be reached concerning alternative or additional technical solutions or procedures. Such agreement is made between the manufacturer and the purchaser. The matters should preferably be raised at an early stage and the agreements included in the contract specification.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 1094.2 Power Transformers Part 2: Temperature Rise for Liquid-immersed Transformers (GB 1094.2-2013, IEC 60076 - 2: 2011, MOD)
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 1094.5-2008, IEC 60076-5: 2006, MOD)
GB/T 1094.10 Power Transformers - Part 10: Determination of Sound Levels (GB/T 1094.10-2003, IEC 60076-10: 2001, MOD)
GB 1094.11 Power Transformers - Part 11: Dry-type Transformers (GB 1094.11-2007, IEC 60076-11: 2004, MOD)
GB/T 2521 Cold-rolled Grain-oriented and Non-oriented Magnetic steel Strip (Sheet) (GB/T 2521-2008, IEC 60404-8-7: 1998 and IEC60404-8-4: 1998, MOD)
GB 2536 Fluids for Electrotechnical Applications - Unused Mineral Insulating oils for Transformers and Switchgear(GB 2536-2011, IEC 60296: 2003, MOD)
GB/T 2900.15 Electrotechnical Terminology - Transformer, Instrument Transformer, Voltage Regulator and Reactor (GB/T 2900.15-1997, neq. IEC 60050-421: 1990 and IEC 60050-321: 1986)
GB/T 4109 Insulated Bushings for Alternating Voltages above 1 000V (GB/T 4109-2008, IEC 60137: 2008, MOD)
GB/T 4798.4 Environmental Conditions Existing in the Application of Electric and Electronic Products - Part 4: Stationary Use at Non-weather-protected Locations (GB/T 4798.4-2007, IEC 60721-3-4: 1995, MOD)
GB 10230.1 Tap-changers - Part 1: Performance Requirements and Test Methods (GB 10230.1-2007, IEC 60214-1: 2003, MOD)
GB/T 19001 Requirements for Quality Management System (GB/T 19001-2008, ISO 9001: 2008, IDT)
3 Terms and Definitions
For the purposes of this document, the terms and definitions specified in GB/T 2900.15 and the following ones apply. Some are listed more than once and some are changed.
3.1 General
3.1.1
Power transformer
A static piece of apparatus with two or more windings which, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power.
Note: GB/T 2900.15-1997, 3.1.1, modified.
3.1.2
Auto-transformer
A transformer in which at least two windings have a common part.
[GB/T 2900.15-1997, 3.1.15]
Note: Where there is a need to express that a transformer is not auto-connected, use is made of terms such as separate winding transformer, or double-wound transformer.
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Service Conditions
5 Rating and General Requirements
6 Requirements for Transformers Having a Tapped Winding
7 Connection and Connection Symbols
8 Rating Plates
9 Safety, Environmental and other Requirements
10 Tolerances
11 Tests
12 Electromagnetic Compatibility (EMC)
13 High Frequency Switching Transients
Annex A (Informative) Technical Differences between This Part and IEC 60076-1: 2011 and Their Reasons
Annex B (Informative) Vacuum Deflection Test and Pressure Deflection Test for Liquid Immersed Transformers in IEC 60076-1:
Annex C (Informative) Examples of Three-phase Transformer Connections
Annex D (Informative) Technical Requirements to be Provided with Enquiry and Order
Annex E (Informative) Examples of Specifications for Transformers with Tappings
Annex F (Informative) Specification of Short-circuit Impedance by Boundaries
Annex G (Normative) Temperature Correction of Load Loss
Annex H (Informative) Facilities for Future Fitting of Condition Monitoring Systems to Transformers
Annex I (Informative) Environmental and Safety Considerations
Bibliography
Scope
This part of GB 1094 applies to three-phase and single-phase power transformers (including auto-transformers) with the exception of certain categories of small and special transformers such as:
——single-phase transformers with rated power less than 1 kVA and three-phase transformers less than 5 kVA;
——transformers, which have no windings with rated voltage higher than 1000 V;
——instrument transformers;
——traction transformers mounted on rolling stock;
——starting transformers;
——testing transformers;
——welding transformers;
——explosion-proof and mining transformers;
——transformers for deep water (submerged) applications.
When some standards do not exist for such categories of transformers (in particular transformer having no winding exceeding 1000V for industrial applications), this part may still be applicable either as a whole or in part.
This part does not address the requirements that would make a transformer suitable for mounting in a position accessible to the general public.
For those categories of power transformers and reactors which have their own standards, this part is applicable only to the extent in which it is specifically called up by cross-reference in the other standard. Such standards exist for:
——reactors (GB/T 1094.6);
——dry-type transformers (GB 1094.11);
——self-protected transformers (IEC 60076-13);
——gas-filled power transformers (IEC 60076-15);
——transformers for wind turbine applications (GB 1094.16);
——traction transformers and traction reactors (GB/T 25120);
——converter transformers for industrial applications (GB/T 18494.1);
——converter transformers for HVDC applications (GB/T 18494.2).
At several places in this part it is specified or recommended that an 'agreement' should be reached concerning alternative or additional technical solutions or procedures. Such agreement is made between the manufacturer and the purchaser. The matters should preferably be raised at an early stage and the agreements included in the contract specification.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 1094.2 Power Transformers Part 2: Temperature Rise for Liquid-immersed Transformers (GB 1094.2-2013, IEC 60076 - 2: 2011, MOD)
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 1094.5-2008, IEC 60076-5: 2006, MOD)
GB/T 1094.10 Power Transformers - Part 10: Determination of Sound Levels (GB/T 1094.10-2003, IEC 60076-10: 2001, MOD)
GB 1094.11 Power Transformers - Part 11: Dry-type Transformers (GB 1094.11-2007, IEC 60076-11: 2004, MOD)
GB/T 2521 Cold-rolled Grain-oriented and Non-oriented Magnetic steel Strip (Sheet) (GB/T 2521-2008, IEC 60404-8-7: 1998 and IEC60404-8-4: 1998, MOD)
GB 2536 Fluids for Electrotechnical Applications - Unused Mineral Insulating oils for Transformers and Switchgear(GB 2536-2011, IEC 60296: 2003, MOD)
GB/T 2900.15 Electrotechnical Terminology - Transformer, Instrument Transformer, Voltage Regulator and Reactor (GB/T 2900.15-1997, neq. IEC 60050-421: 1990 and IEC 60050-321: 1986)
GB/T 4109 Insulated Bushings for Alternating Voltages above 1 000V (GB/T 4109-2008, IEC 60137: 2008, MOD)
GB/T 4798.4 Environmental Conditions Existing in the Application of Electric and Electronic Products - Part 4: Stationary Use at Non-weather-protected Locations (GB/T 4798.4-2007, IEC 60721-3-4: 1995, MOD)
GB 10230.1 Tap-changers - Part 1: Performance Requirements and Test Methods (GB 10230.1-2007, IEC 60214-1: 2003, MOD)
GB/T 19001 Requirements for Quality Management System (GB/T 19001-2008, ISO 9001: 2008, IDT)
3 Terms and Definitions
For the purposes of this document, the terms and definitions specified in GB/T 2900.15 and the following ones apply. Some are listed more than once and some are changed.
3.1 General
3.1.1
Power transformer
A static piece of apparatus with two or more windings which, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power.
Note: GB/T 2900.15-1997, 3.1.1, modified.
3.1.2
Auto-transformer
A transformer in which at least two windings have a common part.
[GB/T 2900.15-1997, 3.1.15]
Note: Where there is a need to express that a transformer is not auto-connected, use is made of terms such as separate winding transformer, or double-wound transformer.
Contents of GB/T 1094.1-2013/XG1-2018
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Service Conditions
5 Rating and General Requirements
6 Requirements for Transformers Having a Tapped Winding
7 Connection and Connection Symbols
8 Rating Plates
9 Safety, Environmental and other Requirements
10 Tolerances
11 Tests
12 Electromagnetic Compatibility (EMC)
13 High Frequency Switching Transients
Annex A (Informative) Technical Differences between This Part and IEC 60076-1: 2011 and Their Reasons
Annex B (Informative) Vacuum Deflection Test and Pressure Deflection Test for Liquid Immersed Transformers in IEC 60076-1:
Annex C (Informative) Examples of Three-phase Transformer Connections
Annex D (Informative) Technical Requirements to be Provided with Enquiry and Order
Annex E (Informative) Examples of Specifications for Transformers with Tappings
Annex F (Informative) Specification of Short-circuit Impedance by Boundaries
Annex G (Normative) Temperature Correction of Load Loss
Annex H (Informative) Facilities for Future Fitting of Condition Monitoring Systems to Transformers
Annex I (Informative) Environmental and Safety Considerations
Bibliography
