This Part of GB/T 18494 applies to oil-immersed three-phase and single-phase convertor transformers for use in HVDC power transmission. It applies to transformers having two, three or multiple windings.
This Part does not apply to:
— Convertor transformers for industrial applications;
— Convertor transformers for traction applications.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Part of GB/T 18494. For dated references, subsequent amendments 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 normative document referred to applies.
GB 1094.1 Power Transformers — Part 1: General (GB 1094.1-1996, eqv IEC 60076-1.1903)
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 2900.15-1997 Electrotechnical Terminology — Transformer, Instrument Transformer, Voltage Regulator and Reactor (neq IEC 60050-421:1990; IEC 60050-321:1986)
GB/T 2900.33-2004 Electrotoechnical Terminology — Power Electronics (IEC 60050-551:1908, IDT)
GB/T 13499-2002 Power Transformers — Application Guide (idt IEC 60076-8:1997)
GB/T 15164-1994 Loading Guide for Oil-immersed Power Transformers (idt IEC 60354:1991)
GB/T 17623-1998 Determination of Componental Contents of Gases Dissolved in Insulating Oil by Gas Chromatography Method (neq IEC 60567:1992)
GB/T 18494.1-2001 Convertor Transformers — Part 1: Transformers for Industrial Applications (idt IEC 61378-1:1997)
3 Terms and Definitions
Contents Foreword III Introduction V 1 Scope 2 Normative References 3 Terms and Definitions 4 Service Conditions 4.1 General 4.2 Temperature 4.3 Load current 4.4 Direction of power flow 5 List of Variables 6 Ratings 6.1 General 6.2 Rated voltage 6.3 Rated current 6.4 Rated frequency 6.5 Rated power 7 Tolerances 7.1 General 7.2 Short-circuit impedance tolerances 7.3 Guarantees 8 Losses 8.1 General 8.2 No-load loss 8.3 Load loss under rated power-frequency conditions 8.4 Load loss under service conditions 8.5 Determination of hot-spot temperature 9 Insulation Levels 9.1 Line windings 9.2 Valve windings 9.3 Induced voltage level with partial discharge measurements 10 Sound Level 10.1 General 10.2 Guaranteed sound-power levels 10.3 Sound-power level at site 11 Testing 11.1 General 11.2 Tests 11.3 Load-loss measurements 11.4 Factory dielectric tests 11.5 Temperature-rise test 11.6 Load-current test 11.7 Determination of transformer sound-power level 12 High-frequency Modelling 13 Loading of Transformer Above Rating 14 Bushings 14.1 AC bushings 14.2 Valve winding bushings 15 Tap-changer 15.1 General 15.2 Current wave shape
