Power transformers - Part 15: Gas-filled power transformers English
1 Scope
This part of GB/T 1094 specifies the terms and definitions, service conditions, rating and general requirements, requirements for transformers having a tapped winding, connection phase displacement symbols, rating plates, safety, environmental and other requirements, tolerances, tests, electromagnetic compatibility (EMC), high frequency switching transients, earthing terminal, information required with enquiry and order of gas-filled power transformers.
This part applies to three-phase and single-phase gas-filled 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 1kVA and three-phase transformers less than 5kVA;
——transformers, which have no windings with rated voltage higher than 1,000V;
——instrument transformers;
——traction transformers mounted on rolling stock;
——starting transformers;
——testing transformers;
——welding transformers.
When standards do not exist for such categories of transformers (in particular transformer having no winding exceeding 1,000V 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 in general (GB/T 1094.6);
——self-protected transformers (IEC 60076-13);
——transformers for wind turbine applications (GB/T 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).
Note 1: At several places in this part, it is specified or recommended that an 'agreement' shall 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.
Note 2: This part can be applicable to the gas parts of a transformer in which an insulating gas is used with an insulating liquid.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1094.1-2013 Power transformers—Part 1: General (IEC 60076-1:2011, MOD)
GB/T 1094.2-2013 Power transformers—Part 2: Temperature rise for liquid-immersed transformers (IEC 60076-2:2011, MOD)
GB/T 1094.3-2017 Power transformers—Part 3: Insulation levels, dielectric tests and external clearances in air (IEC 60076-3:2013, MOD)
GB/T 1094.5 Power transformers—Part 5: Ability to withstand short circuit (GB/T 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/T 4109 Insulated bushings for alternating voltages above 1,000V (GB/T 4109-2008, IEC 60137:2008)
GB/T 8905 The guide for management and measuring SF6 gas in electrical equipment (GB/T 8905-2012, IEC 60480:2004, MOD)
GB/T 11022 Common specifications for high-voltage alternating-current switchgear and control gear standards (GB/T 11022-2011, IEC 62271-1:2007, MOD)
GB/T 12022 Industrial sulfur hexafluoride
GB/T 13499-2002 Power transformers—Application guide (IEC 60076-8:1997, IDT)
IEC 62271-4:2002 High-voltage switchgear and controlgear—Part 4: Handling procedures for sulphur hexafluoride (SF6) and its mixtures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Note: See GB/T 1094.1, GB/T 1094.2, GB/T 1094.3, GB/T 1094.5, GB/T 1094.10 or GB/T 2900.95 for other terms.
3.1
gas-filled power transformer
transformer of which the magnetic circuit and windings are placed in an enclosure filled with an insulating gas
Note 1: Generally, sulfur hexafluoride (SF6) gas is used, and sometimes this transformer is called a gas-insulated transformer.
Note 2: The transformer whose magnetic circuit and winding are placed in a closed box filled with insulating liquid (such as perfluorocarbon, natural ester, synthetic ester, silicone oil, etc.) shall be regarded as liquid-immersed 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
14 Earthing terminal
15 Information required with enquiry and order
Annex A (Informative) Transient loading – Mathematical model
Annex B (Informative) Technical requirements to be provided with enquiry and order
Annex C (Informative) Gauges, indicators and relays for gas-filled power transformers
Bibliography
Figure A.1 Temperature distribution model
Table 1 Classification and insulation system temperature
Table 2 Winding temperature-rise limits
Table 3 Exponents for the corrections of temperature-rise test results
Table C.1 Comparison of gauges, indicators and relays between gas-filled power transformers and oil-immersed power transformers
Power transformers - Part 15: Gas-filled power transformers English
1 Scope
This part of GB/T 1094 specifies the terms and definitions, service conditions, rating and general requirements, requirements for transformers having a tapped winding, connection phase displacement symbols, rating plates, safety, environmental and other requirements, tolerances, tests, electromagnetic compatibility (EMC), high frequency switching transients, earthing terminal, information required with enquiry and order of gas-filled power transformers.
This part applies to three-phase and single-phase gas-filled 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 1kVA and three-phase transformers less than 5kVA;
——transformers, which have no windings with rated voltage higher than 1,000V;
——instrument transformers;
——traction transformers mounted on rolling stock;
——starting transformers;
——testing transformers;
——welding transformers.
When standards do not exist for such categories of transformers (in particular transformer having no winding exceeding 1,000V 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 in general (GB/T 1094.6);
——self-protected transformers (IEC 60076-13);
——transformers for wind turbine applications (GB/T 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).
Note 1: At several places in this part, it is specified or recommended that an 'agreement' shall 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.
Note 2: This part can be applicable to the gas parts of a transformer in which an insulating gas is used with an insulating liquid.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1094.1-2013 Power transformers—Part 1: General (IEC 60076-1:2011, MOD)
GB/T 1094.2-2013 Power transformers—Part 2: Temperature rise for liquid-immersed transformers (IEC 60076-2:2011, MOD)
GB/T 1094.3-2017 Power transformers—Part 3: Insulation levels, dielectric tests and external clearances in air (IEC 60076-3:2013, MOD)
GB/T 1094.5 Power transformers—Part 5: Ability to withstand short circuit (GB/T 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/T 4109 Insulated bushings for alternating voltages above 1,000V (GB/T 4109-2008, IEC 60137:2008)
GB/T 8905 The guide for management and measuring SF6 gas in electrical equipment (GB/T 8905-2012, IEC 60480:2004, MOD)
GB/T 11022 Common specifications for high-voltage alternating-current switchgear and control gear standards (GB/T 11022-2011, IEC 62271-1:2007, MOD)
GB/T 12022 Industrial sulfur hexafluoride
GB/T 13499-2002 Power transformers—Application guide (IEC 60076-8:1997, IDT)
IEC 62271-4:2002 High-voltage switchgear and controlgear—Part 4: Handling procedures for sulphur hexafluoride (SF6) and its mixtures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Note: See GB/T 1094.1, GB/T 1094.2, GB/T 1094.3, GB/T 1094.5, GB/T 1094.10 or GB/T 2900.95 for other terms.
3.1
gas-filled power transformer
transformer of which the magnetic circuit and windings are placed in an enclosure filled with an insulating gas
Note 1: Generally, sulfur hexafluoride (SF6) gas is used, and sometimes this transformer is called a gas-insulated transformer.
Note 2: The transformer whose magnetic circuit and winding are placed in a closed box filled with insulating liquid (such as perfluorocarbon, natural ester, synthetic ester, silicone oil, etc.) shall be regarded as liquid-immersed transformer.
Contents of GB/T 1094.15-2020
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
14 Earthing terminal
15 Information required with enquiry and order
Annex A (Informative) Transient loading – Mathematical model
Annex B (Informative) Technical requirements to be provided with enquiry and order
Annex C (Informative) Gauges, indicators and relays for gas-filled power transformers
Bibliography
Figure A.1 Temperature distribution model
Table 1 Classification and insulation system temperature
Table 2 Winding temperature-rise limits
Table 3 Exponents for the corrections of temperature-rise test results
Table C.1 Comparison of gauges, indicators and relays between gas-filled power transformers and oil-immersed power transformers
