GB/T 40586-2021Technical requirements of grid-related protection of grid-connected power (English PDF)
并网电源涉网保护技术要求
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 11, 2021
Implementation date
May 1, 2022
Scope
GB/T 40586-2021 is the English-translated version of 并网电源涉网保护技术要求.
GB/T 40586-2021 sets out the requirements for the grid-related protection of grid-connected power sources, whose settings depend on how the grid is operated.
It applies to thermal, gas and nuclear units of 100 MW and above and to hydro and solar thermal units of 40 MW and above connected at 220 kV and above, and to new energy and energy storage stations connected at 35 kV and above, distributed sources and synchronous condensers.
For synchronous generators it covers stator and rotor overload, loss of excitation, out-of-step, abnormal frequency, overspeed limiting, overexcitation, stator overvoltage, zero-sequence and compound voltage overcurrent protection.
For new energy plants and distributed sources it covers high and low voltage protection and abnormal frequency protection. It was issued on 11 October 2021 and has applied since 1 May 2022.
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Document preview — GB/T 40586-2021
National Standard of the People's Republic of China
- ICS
- 29.240.01
- Classification
- F 21
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 General requirements
- 5 Technical requirements for network-related protection of synchronous generators
- 5.1 Stator winding symmetrical overload protection
- 5.2 Rotor winding overload protection
- 5.3 Low-excitation loss-of-excitation protection
- 5.4 Out-of-step protection
- 5.5 Frequency Abnormal Protection
- 5.6 Turbine overspeed limit (OPC)
- 5.7 Overexcitation protection
- 5.8 Generator stator overvoltage protection
- 5.9 Transformer zero sequence overcurrent protection
- 5.10 Generator compound voltage overcurrent protection
- 5.11 Type 1 auxiliary machine protection
- 5.12 Zero power protection
- 5.13 Overexcitation limit and overexcitation protection
- 5.14 Overexcitation limit
- 5.15 Low excitation limit
- 5.16 Stator current limit
- 5.17 Voltage adjustment rate
- 5.18 Steam turbine power load imbalance control
- 5.19 Reactive power limit
- 5.20 Other
- 6 Technical requirements for network-related protection of new energy plants and distributed power sources
- 6.1 High/low voltage protection
- 6.2 Frequency Abnormal Protection
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
1 Scope
This document specifies the overall requirements for grid-related protection of grid-connected power supplies, technical requirements for grid-related protection of synchronous units, new energy plants and distributed Power supply network protection technical requirements.
This document applies to thermal power, gas and nuclear power units with a single unit capacity of 100MW and above, hydropower and solar thermal power units with a capacity of 40MW and above, and Connect to 220kV and above synchronous generator sets, and connect to 35kV and above new energy stations, energy storage power stations, and substations.
Cloth-type power supply and tuning camera. Refer to the implementation of other grid-connected power supplies.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 31464 Grid Operation Guidelines
GB 38755 Safety and Stability Guidelines for Power Systems
GB/T 38969 Technical Guidelines for Power System
DL/T 684 Large generator transformer relay protection setting calculation guide
DL/T 1523 Synchronous generator phase advance test guide
DL/T 1648 Technical Specification for High and Low Voltage Ride Through Frequency Converters of Auxiliary Equipment in Power Plants and Substations
DL/T 5153 Technical specification for auxiliary power design of thermal power plant
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Grid-related protection
In the protection and control devices of generator sets (including new energy) and reactive power adjustment equipment such as synchronous cameras and static synchronous compensators, the action The behavior and parameter settings are related to the grid operation mode, or the part that needs to be coordinated with the grid-side safety automatic device.
Note: For example, synchronous generator set stator overvoltage protection, rotor overload protection, loss of excitation protection, loss of step protection, frequency abnormality, overspeed protection, top value and overexcitation limit System, fan over-voltage protection, etc. [Source: GB 38755-2019, 2.12]
3.2 Loss-of-field protection
The protection when the generator partly or completely loses excitation. [Source: DL/T 1309-2013, 3.2]
3.3 Out-of-step operation
The generator loses synchronization due to disturbances, while maintaining full or partial excitation operation.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 31464The grid operation code
- GB 38755Code on security and stability for power system
- GB/T 38969Guide on technology for power system
- DL/T 1523Synchronous Generator Phase Advance Test Guidelines
- DL/T 1648Technical specification for high and low voltage crossing of auxiliary frequency converter of power plant and substation
- DL/T 5153Technical code for the design of auxiliary power system of fossil-fired power plant
DL/T 684
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Related Standards
DL/T 1523-2023 — Synchronous Generator Phase Advance Test Guidelines
DL/T 1648-2016 — Technical specification for high and low voltage crossing of auxiliary frequency converter of power plant and substation
DL/T 5153-2014 — Technical code for the design of auxiliary power system of fossil-fired power plant
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