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NB/T 10421-2020Technical specification of comprehensive treatment equipment for unbalanced current in low voltage distribution grid (English PDF)

低压配网不平衡电流综合治理装置技术规范

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

October 23, 2020

Implementation date

February 1, 2021

Scope

NB/T 10421-2020 is the English-translated version of 低压配网不平衡电流综合治理装置技术规范.

NB/T 10421-2020 is the Chinese energy industry specification for active devices that treat unbalanced current in 0.38 kV, 50 Hz low-voltage distribution networks.

These shunt power-electronic units compensate fundamental negative- and zero-sequence unbalanced current and may also filter harmonics and compensate reactive power.

The standard sets product models and basic parameters, conditions of use, insulation, electrical performance, protection functions, control logic, grid voltage adaptability, temperature rise, electromagnetic compatibility, enclosure protection and communication, with the corresponding inspection methods, inspection rules, marking, packaging, transport and storage.

Appendices give the MODBUS communication protocol, methods for calculating unbalance and a control logic diagram. Other low-voltage levels may apply it by reference. Issued on 23 October 2020, it has applied since 1 February 2021.

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Document preview — NB/T 10421-2020

National Standard of the People's Republic of China

ICS: 29.130.01
Classification: K 30

Issued by: National Energy Administration of the People's Republic of China

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Product model, meaning and basic parameters
4.1 Model and meaning
4.2 Main product models and their basic parameters
5 Technical requirements
5.1 Functional requirements
5.2 Conditions of Use
5.3 Appearance, parts and components
5.4 Insulation performance
5.5 Electrical performance indicators
5.6 Protection function
5.7 Control logic
5.8 Grid voltage adaptability
5.9 Temperature rise limit
5.10 Electromagnetic compatibility
5.11 Protection performance
5.12 Communication function
6 Inspection method
6.1 Inspection conditions
6.2 Inspection of appearance, parts and components
6.3 Insulation withstand voltage test
6.4 Basic function inspection
6.5 Compensation performance inspection
6.6 Protection function inspection
6.7 Grid voltage adaptability test
6.8 Control logic check
6.9 Temperature rise inspection
6.10 Loss inspection
6.11 Electromagnetic compatibility inspection
6.12 Noise inspection
6.13 Protection performance inspection
6.14 Environmental test
7 Inspection rules
7.1 Inspection classification
7.2 Type test
7.3 Factory inspection
7.4 On-site inspection
8 Marking, packaging, transportation and storage
8.1 Sign
8.2 Packaging
8.3 Transportation
8.4 Storage
Appendix A (Normative Appendix) Device MODBUS communication protocol
A.1 Scope of application
A.2 Reference Standard
A.3 The underlying protocol
A.4 Physical interface
A.5 Data transmission rate
A.6 Character format
A.7 Data Type
A.8 Application layer data packet/frame format definition
A.9 Detailed Explanation of Command/Response Information
A.10 CRC calculation function
Appendix B (informative appendix) Unbalance calculation method
B.1 The case where both amplitude and phase are known
B.2 The case where the amplitude is known but the phase is uncertain
Appendix C (informative appendix) Device control logic diagram

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the environmental conditions, functions, performance, and inspection of the comprehensive treatment device for unbalanced current in the low-voltage distribution network (hereinafter referred to as the "device")

Technical requirements for inspection methods, inspection rules, signs, packaging, transportation, and storage.

This standard is applicable to parallel active power electronic unbalanced current synthesis systems with a nominal voltage of 0.38kV and a frequency of 50Hz in low-voltage AC distribution networks.

Combined management device, other low-voltage voltage levels can be implemented by reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 191-2008 Graphical signs for packaging, storage and transportation (ISO 780:1997, MOD)

GB/T 2423.1-2008 Environmental testing of electric and electronic products Part 2: Test method Test A. Low temperature (IEC 60068-2-1:2007, IDT)

GB/T 2423.2-2008 Environmental testing of electric and electronic products Part 2: Test method Test B. High temperature (IEC 60068-2-2:2007, IDT)

GB/T 2423.4-2008 Environmental testing of electric and electronic products Part 2: Test method Test Db. Alternating damp heat (12h 12h cycle) (IEC 60068-2-30:2005, IDT)

GB 2894-2008 Safety signs and guidelines for their use

GB/T 3859.1-2013 General requirements for semiconductor converters and power grid commutated converters Part 1-1.Basic requirements and specifications (IEC 60146-1-1:2009, MOD)

GB/T 4208-2017 Enclosure protection class (IP code) (IEC 60529:2013, IDT)

GB/T 4798.1-2019 Environmental condition classification, environmental parameter group classification and its severity classification Part 1: Storage (IEC 60721-3-1:2018, IDT)

GB/T 4798.2-2008 Environmental conditions for the application of electrical and electronic products Part 2: Transportation (IEC 60721-3-2:1997, MOD)

GB 4824-2019 Industrial, scientific and medical equipment radio frequency disturbance characteristic limits and measurement methods (CISPR11.2016, IDT)

GB/T 15576-2008 Low-voltage complete set of reactive power compensation device

GB/T 17626.2-2018 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test (IEC 61000-4-2:2008, IDT)

GB/T 17626.4-2018 Electromagnetic compatibility test and measurement technology Electrical fast transient pulse group immunity test (IEC 61000-4-4:2012, IDT)

GB/T 17626.5-2019 Electromagnetic compatibility test and measurement technology surge (impact) immunity test (IEC 61000-4-5. 2014, IDT)

GB/T 17626.12-2013 Electromagnetic compatibility test and measurement technology Ring wave immunity test (IEC 61000-4-12:2006, IDT)

3 Terms and definitions

3.1 Active unbalanced current comprehensive treatment device

Use power electronic converter technology to actively compensate the fundamental unbalanced current of the load (negative sequence current or zero sequence current), and also have harmonic filtering Parallel active device with wave and fundamental reactive power compensation function.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 27 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 18216.6-2022|NB/T 10327-2019|NB/T 10188-2019|NB/T 10204-2019|GB/T 44114-2024|GB/T 18216.10-2022

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