This part of GB 1094 applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 40.5 kV and at least one winding operating at greater than 1.1 kV. The standard applies to all construction technologies.
This standard does not apply to:
——gas-filled dry type transformers where the gas is not air;
——single-phase transformers rated at less than 5 kVA;
——poly-phase transformers rated at less than 15 kVA;
——instrument transformers;
——starting transformers;
——testing transformers;
——traction transformers mounted on rolling stock;
——flameproof and mining transformers;
——welding transformers;
——voltage regulating transformers;
——small power transformers in which safety is a special consideration.
Where corresponding standards do not exist for the transformers mentioned above or for other special transformers, this part may be applicable as a whole or in parts.
2 Normative References
The following standards contain provisions which, through reference in this part of GB 1094, constitute provisions of this part. For dated references, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. 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 Levels (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 Enclosures (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 Substation (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
For the purposes of this part, the terms and definitions given in GB/T 2900.15 and the followings apply.
3.1
dry-type transformer
transformer of which the iron core and windings are not immersed in an insulating liquid
3.2
totally enclosed dry-type transformer
transformer in an un-pressurized enclosure cooled by the circulation of the internal air
3.3
enclosed dry-type transformer
transformer in a ventilated enclosure cooled by the circulation of the external air
3.4
non-enclosed dry-type transformer
transformer supplied without a protective enclosure cooled by natural or forced air ventilation
