1 Scope
This part is intended to assist in the selection of tap-changers designed in accordance with GB 10230.1 for use in conjunction with the tapped windings of transformers or reactors. It is also intended to assist in understanding the various types of tap-changers and their associated equipment available. The application guide covers on-load tap-changers (resistor and reactor types) and off-circuit tap-changers.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties to coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents applies. For undated references, the latest editions apply.
GB 1094.1-1996 Power Transformers - Part 1: General (eqv IEC 60076-1: 1993)
GB 1094.3-2003 Power transformers - Part 3: Insulation Levels, Dielectric Tests and External Clearances in Air (eqv IEC 60076-3: 2000)
GB 1094.5-2003 Power Transformers - Part 5: Ability to Withstand Short Circuit (eqv IEC 60076-5: 2000)
GB 1094.11-2007 Power Transformers - Part 11: Dry-type Transformers (IEC 60076-11:2004, MOD)
GB/T 7252 Guide to the Analysis and the Diagnosis of Gases Dissolved in Transformer Oil (GB/T 7252-2001, neq IEC 60599: 1999)
GB 10230.1-2007 Tap-changers - Part 1: Performance Requirements and Test Methods (IEC 60214-1: 2003, MOD)
GB/T 15164 Loading Guide for Oil-immersed Power Transformers (GB/T 15164-1994, eqv IEC 60354: 1991)
IEC 60296: 2003 Fluids for Electrotechnical Applications - Unused Mineral Insulating Oils for Transformers and Switchgear
3 Terms and Definitions
For the purposes of this part, the terms and definitions given in GB 10230.1-2007 apply.
4 Symbols and Abbreviations
DGA Dissolved gas analysis
HVDC High-voltage direct current
PST Phase-shifting transformer
5 Types of Tap-changer
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Symbols and Abbreviations
5 Types of Tap-changer
5.1 General
5.2 On-load Tap-changers
5.3 Off-circuit Tap-changers
5.4 Liquid-immersed Tap-changers
5.5 Dry-type Tap-changers
5.6 Other Types
5.7 Protective Devices
6 Selection of Tap-changers
6.1 General
6.2 On-load Tap-changers
6.3 Off-circuit tap-changers
7 Location of Liquid Immersed Tap-changers
7.1 Tap Selectors
7.2 Diverter and Selector Switches
8 Fittings
8.1 Valves, Air Release Vents and Liquid-sampling Devices
8.2 Liquid Level Gauges
8.3 Low Liquid Level Alarms
8.4 Nameplate and Other Plates
8.5 Devices to Aid Maintenance
8.6 Dehydrating Breathers
9 Field Service (Operation, Maintenance and Monitoring)
9.1 Operation
9.2 Maintenance
9.3 Monitoring in Service
10 Information to be Provided by the Transformer Manufacturer
10.1 Information Required at the Enquiry or Order Stage for an On-load Tap-changer
10.2 Information Required with Enquiry or Order for Off-Circuit Tap-changers
10.3 Documentation
11 Protection and Safety
11.1 Protection
11.2 Safety Aspects
11.3 Immersing Medium
Figure 1 External Tap-changer with Separate Tap Selector and Diverter Switch Compartments (for Mounting on the End or Side of the Transformer)
Figure 2 External Selector Switches (for Mounting on the End or Side of the Transformer)
Figure 3 External Mounted Internal Tap-changer with Separate Barrier Board
Figure 4 Internal Separate Tap Selector and Diverter Switch
Figure 5 Internal Selector Switch
