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NB/T 10220-2019: Structural Design specification for Electrical Control Equipment of Plateau Type WTGs
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Structural Design specification for Electrical Control Equipment of Plateau Type WTGs
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NB/T 10220-2019
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Basic data | Standard ID | NB/T 10220-2019 (NB/T10220-2019) | | Description (Translated English) | Structural Design specification for Electrical Control Equipment of Plateau Type WTGs | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | K45 | | Classification of International Standard | 29.120.01 | | Word Count Estimation | 16,160 | | Date of Issue | 2018-06-04 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | NB/T 10220-2019: Structural Design specification for Electrical Control Equipment of Plateau Type WTGs
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Structral Design specification for Electrical Control Equipment
NB ICS 29.120.01K 45
Energy Industry Standards of the People's Republic of China
Electrical control equipment of wind turbine generator set for plateau
Structural design specifications
of Plateau TypeWTGs
2018-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Parameters of plateau environmental conditions...2
5 Classification of structural parts...2
6 Technical requirements for metal structural parts...2
7 Selection principles and requirements for non-metallic structural parts...7
Appendix A (Informative Appendix) Corrosion Environment and Durability Level...8
Appendix B (informative appendix) The influence of plateau environment on the structure of electrical control equipment...10
Appendix C (Normative Appendix) Electric Clearance and Creepage Distance...11
Appendix D (informative appendix) Commonly used rubber material properties for electrical control equipment...13
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Electrical Equipment Industry Association.
This standard is organized by the National Plateau Electrical Products Environmental Technology Standardization Technical Committee (SAC/TC330) and the energy industry wind power standardization technology
Under the jurisdiction of the Technical Committee Wind Power Electrical Equipment Sub-Technical Committee (NEA/TCl/SC6).
Drafting organizations of this standard. Beijing Goldwind Kechuang Wind Power Equipment Co., Ltd., Beijing Tiancheng Tongchuang Electric Co., Ltd., Kunming Electric
Research Institute, Shanghai Electric Wind Power Group Co., Ltd., Mingyang Smart Energy Group Co., Ltd., Shanghai Electric Power Transmission and Distribution Group Co., Ltd.
Company, Guodian United Power Technology Co., Ltd., China Electric Power Research Institute, Chengdu Forte Technology Co., Ltd., Tianjin Ruineng Power
Gas Co., Ltd., Beijing Institute of Electrical Technology and Economics of Machinery Industry, Guangdong Yuanguang Cable Industry Co., Ltd.
The main drafters of this standard. Wang Ziling, Wang Yanhua, Hou Yao, Zhou Qiongfang, Rong Qi, Yu Qing, Zhao Xu, Zhao Jinliang, Zhang Xing, Zhou
Shengbing, Wang Ruiming, Fu Xiaolin, Zuo Gangqiang, Chen Dongliang, Li Nan, Zhang Li, Gao Bo, Yang Ajuan, Cai Zhongguang, Jiang Lusi, Zhao Ronghao,
Jia Lianhua.
Design specification for structural parts of electrical control equipment of high prototype wind turbine
1 Scope
This standard specifies the definition of terms for the design of high-level prototype wind turbine low-voltage switchgear and control equipment structural parts.
Parameters of environmental conditions, classification of structural parts, and technical requirements.
This standard is applicable to low-rise towers, nacelles and hubs located in towers, nacelles and hubs within the range from above.2000 m to below 5000 m (inclusive)
Piezoelectric control equipment.
The voltage range covered by this standard complies with the voltage range required by GB/T 7251.1 and GB/T 7251.12.
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
file. For undated references, the latest version (including all amendments) applies to this document.
GB/T 1303.4 Thermosetting resin industrial hard laminate for electrical use-Part 4.Epoxy resin hard laminate
GB/T 7251.1-2013 Low-voltage switchgear and control equipment Part 1.General rules
GB/T 7251.12-2013 Low-voltage switchgear and control equipment-Part 2.Complete power switch and control equipment
GB/T 8013.1 Aluminum and aluminum alloy anodic oxide film and organic polymer film Part 1.Anodic oxide film
GB/T 9799 Metal and other inorganic coatings, treated zinc plating on steel
GB/T 11804 Terms of Environmental Conditions for Electrical and Electronic Products
GB/T 12599 Technical specifications and test methods for tin electroplated metal coating
GB/T 13912 Technical requirements and test methods for hot-dip galvanizing of steel parts with metal coating
GB/T 15568-2008 general-purpose sheet molding compound (SMC)
GB/T 16935.1-2008 Insulation coordination of equipment in low-voltage systems-Part 1.Principles, requirements and tests
GB/T 20625 Terms for special environmental conditions
GB/T 20626.1-2017 Special environmental conditions Plateau electrical and electronic products Part 1.General technical requirements
GB/T 22764.5 Low Voltage Cabinet Part 5.Basic Test Method
GB/T 18663.1 Mechanical structure of electronic equipment metric series and imperial series test part 1.cabinets, racks, sub-boxes and
The climate, mechanical test and safety requirements of the chassis
GB/T 23641 Electrical fiber reinforced unsaturated polyester molding compound (SMC/BMC)
GB/T 31140 Environmental Technical Requirements for Wind Power Equipment Used in Plateau
GB 50149 Specification for Construction and Acceptance of Busbar Installation of Electrical Installation Engineering
NB/T 31138 Technical requirements for anticorrosion of electronic control product structure of plateau wind turbine
3 Terms and definitions
GB/T 7251.1, GB/T 7251.12, GB/T 11804, GB/T 20625 and NB/T 31138 as well as the following terms and definitions
The meaning applies to this document.
3.1
Electrical Controlassemblies
It is mainly used to control the switching equipment of the power receiving equipment and the combination of the control, measurement, protection and regulation equipment associated with it.
Called. It also refers to the combination of these electrical appliances and the associated internal connecting wires, auxiliary parts, housing and supporting members.
[GB/T 3797-2016, definition 3.1].
3.2
Degree of protection
In accordance with the inspection method specified in the standard, determine the protection provided by the enclosure against people approaching dangerous parts and preventing solid foreign objects from entering or water entering.
Degree of protection.
[GB/T 4208-2017, definition 3.3].
4 Parameters of plateau environmental conditions
4.1 Environmental conditions parameters
In addition to the environmental condition parameters in accordance with GB/T 31140, other operating environment requirements are as follows.
a) Corrosion grade and durability. C3-high and above, see Appendix A;
b) Pollution degree. Level 3 and above, see Article 7.1.3 in GB/T 7251.1-2013;
c) Overvoltage category. Category IV, see Article 4.3.3.2.2 in GB/T 16935.1-2008;
d) When there are special requirements, such as molds, fungi, and animals that are harmful to the product, the supplier and the buyer shall negotiate by themselves.
4.2 The influence of plateau environment on the structural parts of electrical control equipment
See Appendix B.
5 Classification of structural parts
5.1 The structural parts of electrical control equipment mainly include cabinets, structural parts outside the cabinet, structural parts inside the cabinet, copper bars, and standard parts
Wait.
5.2 The external structural parts of the cabinet mainly include. lifting beams on the top of the cabinet, the base of the cabinet, and other special-shaped parts.
5.3 The structural parts inside the cabinet mainly include. mounting plates, beams, supports, insulating parts, and other special-shaped parts.
6 Technical requirements for metal structural parts
6.1 Design and process technical requirements
6.1.1 Cabinet
The cabinet design and process requirements are as follows.
a) The form of the cabinet can be a box type welded cabinet or a frame type cabinet;
b) The protection level of the cabinet with forced air cooling, liquid cooling and natural cooling is not less than IP54.For forced air cooling
The dust-proof net of the cabinet should be convenient for regular cleaning and replacement;
c) If the cabinet is composed of parts with different protection levels, the complete set of equipment manufacturers should separately mark the protection levels of different parts;
d) The cabinet should have sufficient strength and rigidity as well as the ability to withstand vibration and impact to meet the requirements of the equipment, components,
The installation, commissioning and operation requirements of the wiring and its accessories can meet the requirements of cabinet combining of complete sets of equipment, and meet the requirements of transportation and hoisting;
e) The cabinet body should be designed with safe and reliable fixed installation holes and lifting installation holes according to the carrying capacity, and enter according to GB/T 22764.5
Perform no-load lifting and stiffness characteristic test. After the test, no deformation or damage of parts that affect the fit or function is allowed;
f) The cabinet shall be subjected to vibration and shock tests in accordance with GB/T 18663.1.After the test, the parts shall not be allowed to affect the shape, fit or
Functional deformation or destruction.
g) The combination form and external dimensions of the cabinet should consider the possibility of maintenance, disassembly and replacement during the whole life cycle, and it should be in advance
Fully evaluate the space constraints of the hub, nacelle, and tower;
h) The independent shell, frame, front door, back panel, top cover, mounting plate, door lock and other metal structural parts of the cabinet shall pass
Direct mutual effective connection or mutual effective connection completed by the protective conductor to ensure the continuity of the circuit;
i) The cabinets that realize conductive interconnection should be equipped with safety grounding points or safety grounding terminals, and there should be obvious protective grounding signs;
j) The resistance between the exposed conductive part of the cabinet and the protective grounding point should not be greater than 1Ω, and the contact resistance of each connection point should not
Greater than 0.1Ω;
k) Cabinet doors and other movable parts should be opened and closed flexibly, door locks should be reliable, and the coating or plating should not be damaged during the opening and closing process.
The opening angle of the door should not be less than 90 degrees, and the door limit mechanism should be set if necessary;
l) The structure should prevent the gap caused by the stress and deformation of the door and affect the sealing performance;
m) The anti-corrosion grade of cabinet door locks and hinges and other accessories is not lower than the cabinet anti-corrosion grade; when the door lock is set outside the sealing strip, the door lock
The protection level can be lower than the cabinet protection level. When the door lock is installed in the door sealing strip, the door lock protection level shall not be lower than the cabinet protection level.
Body protection level;
n) The joints of the sealing strips between the cabinets of the combined cabinets should be under the water flow, and glued and smoothed to prevent water seepage;
o) Sealant should be applied to the welded joints of the welding cabinet.
6.1.2 Metal structural parts outside and inside the cabinet
The design and process requirements are as follows.
a) The hoisting beams, cabinet bases, beams, supports, etc. outside the cabinet should be made of profile or sheet metal bending;
b) At the beginning of the design of the load-bearing parts, load simulation should be carried out according to the load and force condition, or use the verified
Structural parts of the same type;
c) Minimize the use of welding structures. Welding structures are inevitable. The welding should be firm and uniform. There should be no false welding, pores, cracks,
For defects such as weld penetration, gaps, undercuts, arc craters, scratches, etc., the hot-dip galvanized parts shall be fully welded;
d) Assembled parts of different types of metal materials cannot be treated together in solution, spraying or after electrochemical treatment should be used as much as possible
Make a combination
e) When two metals (or plating) are in contact, use two metal contacts with similar potentials;
f) The potential difference between the two metals (or plating) inside the cabinet should not exceed 0.5V at most;
g) The potential difference between the two metals (or plating) outside the cabinet should not exceed 0.25V;
h) When two metals (or plating) that are not allowed to contact are in contact, use plating or coating to reduce the potential difference, or add
The method of compatible metal gaskets should be adjusted to meet the requirements of f) and g) for potential difference;
i) The edges of all parts and openings should be flat and smooth, flash burrs should be removed, sharp edges should be blunt, and the edges should be rounded as far as possible, half rounded
The diameter is at least 0.8mm;
j) For electroplating and oxidizing parts, avoid deep recesses, blind holes and water accumulation structures, and reserve overflow holes for plating solution and gas where there is a ring profile;
Prevent the accumulation of corrosive liquid and it is difficult to remove;
k) Try to avoid the joint structure to prevent the storage of corrosive liquid; seal the inevitable welds and riveting gaps with sealant;
l) The overall design of the structure should be conducive to surface treatment, painting, inspection and maintenance;
m) The design should be as simple as possible, avoid being too complicated, and be easy to install and disassemble;
n) Avoid corrosion caused by design stress, processing and assembly stress;
6.1.3 Copper bar structure
The design and process requirements are as follows.
a) The lap and installation of copper bars meet the requirements of GB 50149;
b) On the premise of satisfying the current carrying capacity, the copper busbar shall give a design margin, and try to use common specifications copper busbar;
c) Copper bars are the main conductors of electrical control equipment. In addition to meeting electrical performance, the structure design and processing also need to consider such as
The following factors.
1) When an AC circuit passes through a metal frame forming a closed magnetic circuit, the three-phase copper bar should pass through the same frame hole;
2) There should be no cracks in the bend of the copper bar, and no defects such as indentations, pits, burrs, etc. on the surface;
3) A gap of more than 3mm must be maintained between the steel washer and the steel washer on the copper bar to prevent the closed magnetic circuit formed by the steel nail
vortex;
4) The copper bars should have sufficient mechanical strength, and the insulation support spacing of the busbars is shown in Table 1;
5) When the copper bar is too long, in order to make the copper bar have expansion and contraction margin in the longitudinal direction, expansion and contraction compensation should be set in the appropriate part of the bus bar.
Joint
6) The connecting hole of the copper bar is generally a round hole, only the longer copper bar is directly fixed on the supporting insulator with bolts
Or other special circumstances, long round holes are allowed;
7) To avoid arc discharge, the ends of the copper bars between two adjacent items are rounded.
6.2 Calculation of clearance and creepage distance
6.2.1 General
According to Article 8.3.1 of GB/T 7251.1-2013, electrical clearance and creepage distance are applicable to phase-to-phase and relatively neutral lines; except for conductors
Direct grounding is also suitable for relative ground and neutral to ground. For bare live conductors and terminals (e.g., busbars, devices and cable joints
Connection) The electrical clearance and creepage distance should at least comply with the relevant regulations of the equipment directly connected to it. When the clearance and creepage distance
When the parameter requirements of 6.2.2 a) and b) cannot be met, insulation protection treatment is required.
For the electrical clearance and creepage distance involved in withdrawable structural parts, manufacturing tolerances and dimensions due to wear should be considered
For changes, see Article 8.3.2 of GB/T 7251.12-2013.
6.2.2 Electrical clearance
The electrical clearance design requirements are as follows.
a) To determine the rated impulse withstand voltage, the overvoltage category is Category IV, according to Appendix G of GB/T 7251.1-2013, which is determined by the nominal voltage
To determine the rated impulse withstand voltage of the equipment, see Appendix C, Table C.1;
b) Determine the correction factor of the rated impulse withstand voltage according to the altitude, in accordance with Article 5.5.1 of GB/T 20626.1-2017, in the product
When the operating altitude is different from the test altitude, the power frequency withstand voltage and impulse withstand voltage are corrected according to the altitude where the product is installed.
The correction factor is shown in Appendix C, Table C.2;
c) The determination of the electrical clearance from sea level to.2000 m above sea level is based on Article 8.3.2 of GB 7251.1-2013.
The minimum electrical clearance from the plane to 2 000 m. Considering that the circuit should be able to withstand temporary overvoltage and transient overvoltage, shock is recommended
The voltage is determined by a value higher than the rated impulse withstand voltage determined by the basic insulation. The highest altitude from sea level to 2 000 m
See Appendix C, Table C.3 for small electrical clearance;
d) The clearance of electrical control equipment of the prototype wind turbine generator set with air as the insulating medium is in accordance with GB/T 20626.1-2017
Article 5.2 The clearance correction factor shall be corrected.
See Appendix C, Table C.4, and the revised minimum electrical clearance of high altitude electrical control equipment is shown in Table 2.
6.2.3 Creepage distance.
The design requirements for creepage distance are as follows.
a) The rated insulation voltage is selected from the nominal voltage, according to Article 4.3.2.2 of GB/T 16935.1-2008, Table F.3a and Table F.3b,
See Table 3;
b) According to Article 8.3.3 of GB/T 7251.1-2013 and Table 2, the altitude from sea level to 2 000 m is determined by the rated insulation voltage
The minimum creepage distance for electrical control equipment is 3, the material group is classified as Class III, and the altitude ranges from sea level to 2 000 m
The minimum creepage distance is shown in Table 3;
c) The minimum creepage distance is determined at an altitude of.2000 m to 4000 m, and the standard does not specify a correction system for high altitude creepage distance.
The minimum creepage distance is required to be no lower than the electrical clearance. See Table 3.
Table 3 Minimum creepage distance
6.3 Selection, surface treatment and protective measures of metal materials for structural parts
On the basis of reasonable structure and process design, comprehensive consideration of disassembly, maintenance, economy and other characteristics, reasonable selection and protection of materials,
See Table 4 for material selection, surface treatment and protective measures of electrical control equipment structural parts.
Appendix A
(Informative appendix)
Corrosive environment and durability level
A.1 Corrosion levels of atmospheric environment and typical environment examples
The atmospheric environment corrosiveness classification can be divided into 6 levels. The classification definition and corresponding durability levels are shown in Table A.1.
Appendix B
(Informative appendix)
The influence of plateau environment on the structure of electrical control equipment
B.1 The influence of plateau environment on the structural parts of electrical control equipment
The most obvious impact of the plateau environment on the structural parts of electrical control equipment is that as the altitude increases, the air density decreases, and the device
Insulation capacity decreases, electrical clearance and creepage distance need to be increased, and structural design needs to be checked and adjusted;
The range and rate of change of the air temperature in the plateau environment will exceed that of the ordinary land environment. If the temperature difference between day and night is too large, it is easy to produce condensation and make
Reduced insulation performance will also deform and crack parts and deform plastic materials. Low relative humidity can easily lead to plastics, etc.
The insulating material is deformed or cracked.
Changes in the humidity of the plateau environment, condensation, reasonable selection of materials, design and protection, improve product environmental adaptability. Affect electrical control equipment
The factors of preparation materials and structural performance are shown in Table B.1.
Appendix C
(Normative appendix)
Electric clearance and creepage distance
C.1 Rated impulse withstand voltage
The clearance should be determined according to the rated impulse withstand voltage, and the rated impulse withstand voltage of the equipment is determined by the nominal voltage, see Table C.1.
C.2 Altitude correction factor for power frequency withstand voltage and impulse withstand voltage
When the product use altitude is different from the test altitude, the power frequency withstand voltage and impulse withstand voltage are corrected according to the altitude where the product is installed.
The correction factor is shown in Table C.2.
Note 1.In the routine test focusing on the assessment of internal insulation quality, according to the relevant product standards, the test voltage is the product's resistance at an altitude of 1000m or.2000m.
The received voltage value will not be corrected.
Note 2.The test voltage value is the product of the value specified in the standard of the conventional product and the altitude correction factor Ka.
Note 3.If the altitude exceeds 3500m, this table is only for reference, especially for ultra-high voltage and ultra-high voltage equipment.
C.3 Minimum electrical clearance from sea level to 2 000 m above sea level
According to Article 8.3.2 of GB/T 7251.1-2013, determine the minimum electrical clearance from sea level to 2 000 m above sea level, see Table C.3.
C.4 Clearance correction factor
According to the altitude, determine the correction factor, see Table C.4 for the clearance correction factor.
D.1 Common rubber material characteristics
The main characteristics, working temperature and main uses of rubber are shown in Table D.1.
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