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GB/T 1094.23-2019Power transformers -- Part 23: DC magnetic bias suppression devices (English PDF)

电力变压器第23部分：直流偏磁抑制装置

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

December 10, 2019

Implementation date

July 1, 2020

Scope

GB/T 1094.23-2019 is the English-translated version of 电力变压器第23部分：直流偏磁抑制装置.

GB/T 1094.23-2019 is the Chinese standard "Power transformers -- Part 23: DC magnetic bias suppression devices". Its scope clause reads: This part of GB/T 1094 specifies the terms and definitions, conditions of use, selection principles, and techniques of DC bias suppression devices for power transformers.

Technical requirements, tests, signs, packaging, transportation, storage, nameplate and technical file requirements.

This section applies to DC bias suppression devices installed at the neutral point of 110kV and above power transformers and converter transformers (including Resistance type current limiting device and capacitor type DC blocking device) and its auxiliary equipment (hereinafter referred to as the device).

For other voltage level transformer neutral point DC bias suppression devices, please refer to this section for implementation. Its clauses include terms and definitions.

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Document preview — GB/T 1094.23-2019

National Standard of the People's Republic of China

ICS: 29.180
Classification: K 41

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Conditions of use
5 Selection principles
6 Technical requirements
7 Test
8 Marking, packaging, transport and storage
9 Nameplate
10 Technical Document Requirements
Appendix A (informative) Technical differences between this part and IEC TS60076-23..2018 and their causes
Appendix B (Informative) Principles of DC Generation in Ground Caused by HVDC Transmission System
Appendix C (informative) Examples of harm caused by DC bias
Appendix D (Informative) Resistive Current Limiting Device
Appendix E (informative) Capacitive DC blocking device
Appendix F (Informative) Information Required for Transformer Neutral Point DC Calculations
Appendix G (Informative) DC Bias Current Calculation Method
Appendix H (Informative) Application Cases

1 Scope

This part of GB/T 1094 specifies the terms and definitions, conditions of use, selection principles, and techniques of DC bias suppression devices for power transformers.

Technical requirements, tests, signs, packaging, transportation, storage, nameplate and technical file requirements.

This section applies to DC bias suppression devices installed at the neutral point of 110kV and above power transformers and converter transformers (including

Resistance type current limiting device and capacitor type DC blocking device) and its auxiliary equipment (hereinafter referred to as the device).

For other voltage level transformer neutral point DC bias suppression devices, please refer to this section for implementation.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article

Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 1094.1 Power transformers Part 1. General (GB/T 1094.1-2013, IEC 60076-1..2011, MOD)

GB/T 1094.2 Power transformers Part 2. Temperature rise of oil-immersed transformers (GB/T 1094.2-2013, IEC 60076-2.

(2011, MOD)

GB/T 1094.3 Power transformers Part 3. Insulation level, insulation test and external insulation air gap (GB/T 1094.3-

2017, IEC 60076-3..2013, MOD)

GB/T 1094.5 Power transformers Part 5. Ability to withstand short circuits (GB/T 1094.5-2008, IEC 60076-5.

(2006, MOD)

GB/T 1094.6 Power transformers Part 6. Reactors (GB/T 1094.6-2011, IEC 60076-6..2007, MOD)

GB/T 3804 3.6kV ~ 40.5kV high voltage AC load switch (GB/T 3804-2017, IEC 62271-103..2011,

MOD)

GB/T 4109 Insulation bushing with AC voltage higher than 1000V (GB/T 4019-2008, IEC 60137Ed.6.0, MOD)

GB/T 4208 enclosure protection grade (IP code) (GB/T 4208-2017, IEC 60529..2013, IDT)

GB/T 8287.1 Insulators for indoor and outdoor pillars of systems with a nominal voltage higher than 1000V Part 1. Porcelain or glass insulators

Test (GB/T 8287.1-2008, IEC 60168..2001, MOD)

GB/T 9091 Inductive Voltage Divider (GB/T 9091-2008, IEC 60618..1997, IDT)

GB/T 15291 Semiconductor devices Part 6. Thyristors (GB/T 15291-2015, IEC 60747-6..2000, IDT)

GB/T 16927.1 High-voltage test technology Part 1. General definition and test requirements (GB/T 16927.1-2011, (IEC 60060-1..2010, MOD)

GB/T 17702 Power Electronic Capacitor (GB/T 17702-2013, IEC 61071..2007, IDT)

GB/T 17949.1 Guidelines for measuring soil resistivity, ground impedance and ground potential of grounding systems. Part 1. Routine measurements

JB/T 8168 pulse capacitor and DC capacitor

JB/T 10777 neutral point grounding resistor

3 terms and definitions

The following terms and definitions apply to this document.

GB/T 10228 | GB/T 8286 | GB 1094.1 | GB/Z 1094.20 | GB/T 1094.16 | GB/T 1094.14 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 64 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60076 · GB/T 1094.2 · GB/T 1094.2-2013 · GB/T 1094.5 · GB/T 1094.5-2008 · IEC 62271 · IEC 60137 · IEC 60529 · IEC 60168 · IEC 60618 · IEC 60747 · IEC 60060 · IEC 61071

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