Some standard content:
GB2314—1997
GB2314 General Technical Conditions for Power Fittings is the general standard for the design, manufacture, installation and use of power fittings, and plays a guiding role in improving the design level, manufacturing quality and standardization level of fittings. This standard is revised from GB2314-85 according to the plan of the Ministry of Electric Power Industry of the People's Republic of China. During the revision, the relevant standards of IECTC1I were referred to and combined with the specific conditions of my country. Many modifications and supplements were made in the compilation of the type and content of the clauses, and the requirements for materials and processes were added. The national standards for fitting manufacturing materials are listed in the appendix. After the revision, this standard has reached the advanced level of similar international standards.
This standard shall be implemented from October 1, 1998: from the date of implementation, all standards related to this standard that are submitted for approval shall comply with the provisions of this standard.
This standard will replace GB2314-85 from the date of implementation. This standard is proposed by the Ministry of Electric Power Industry of the People's Republic of China. This standard is under the jurisdiction of the National Overhead Line (Power Fittings) Standardization Technical Committee. This standard is drafted by the Electric Power Construction Research Institute of the Ministry of Electric Power Industry and Zhejiang Electric Power Design Institute. The main drafters of this standard are: Dong Jiyu, Bo Tong, Xu Naiguan, Xu Shaoxian, Zhao Junhu, Jiang Liangxiu, Luo Yizu, etc. 1 Scope
National Standard of the People's Republic of China
General Technical Requirements for Electric Power Fittings
General Technical Requirements for Electric Power Fittings
GB 2314—1997
Replaces G 2314—8
This standard applies to electric power fittings (hereinafter referred to as fittings) used for overhead power lines, substations and power distribution equipment with a rated voltage of 10kV and above.
Similar fittings used in low-voltage distribution networks can refer to this standard. Fittings used in severe corrosion and pollution environments, high altitude areas, high-cold areas, etc. should also meet the relevant provisions of other standards. 2 Reference to Standards
The provisions contained in the following standards become the provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB196-81 Basic dimensions of common threads (diameter 1~600 nim) GB 1804-92
GR 2315
End tolerances of linear dimensions
General tolerances
Nominal load series of power fittings and part connection dimensions Power fittings product model naming method
GB 2316-—85
GB 2317—85
Acceptance rules, test methods, marking and packaging of power fittings Vibration damper
GB 2336—85
GB 2338—85
GB 5075—85
GP 5958-86*
Terminology of power fittings
General technical conditions for hot-dip galvanized layer of insulator metal accessories GB/T 4056-94 Connection structure and dimensions of intermittent insulators for high-voltage lines JB/T8177-95 General technical conditions for hot-dip galvanized layers of insulated metal accessories 3 Basic requirements
3.1 Hardware should be manufactured using drawings approved in accordance with the prescribed procedures 3.2 Hardware should withstand the relevant mechanical loads that may occur during installation, maintenance and operation, and be able to withstand the test of various conditions such as the designed working current (including short-circuit current), working temperature and environmental conditions. 3.3 The nominal breaking load and connection type size of hardware should comply with the provisions of GB2815. 3.4 Each connecting part of the hardware should have a locking device to ensure that it will not loosen during operation. Hardware related to live line maintenance should also ensure safety and ease of operation.
* Has been reduced to an industry standard,
Approved by the State Administration of Technical Supervision on September 24, 1997 and implemented on October 1, 1998
GB 2314-1997 wwW.bzxz.Net
3.5 Hardware should minimize hysteresis and current loss, and limit the impact of corona. For hardware with rated voltage of 330kV and above, when shielding devices are not used, the hardware itself should have anti-corona characteristics. 3.6 Hardware should be made of suitable materials and production technology. 3.7 Appearance quality of hardware
3.7.1 Appearance quality of forgeable iron castings after hot-dip galvanizing: a) The surface of the casting should be bright, smooth, and free of defects such as cracks and shrinkage. b) The important parts of the casting (referring to the parts where the machine load is not allowed to be reduced, subject to the markings on the product drawings) are not allowed to have defects such as pores, sand holes, slag holes and flying back.
c) The parts connected with other parts and in contact with the wires and ground wires (such as ears and wires) are not allowed to have defects such as sand swelling, scarring, burrs, etc. that hinder the connection and damage the wires or ground wires.
3.7.2 Appearance quality of forgings and stampings after hot-dip galvanizing: a) The shear section slope deviation of the blanking parts should be less than one tenth of the plate thickness. b) Forgings, stampings and sheared parts should be flat and smooth, and no defects such as burrs, cracks and laminations are allowed. Forgings and hot-bent parts are not allowed to have overburning, lamination, Local melting and oxide scale exist; c)
d) The electrical contact surface of the aluminum part should be smooth and clean, and no burrs or dents exceeding the limit deviation of the plate thickness, scratches, pits and indentations are allowed:
3.7.3 Appearance quality of aluminum parts (hot extrusion, die casting, metal mold casting aluminum parts): t) The surface of aluminum parts should be smooth and clean: visible cracks are not allowed: b) Important parts of cast aluminum parts (referring to parts with mechanical load requirements, marked parts according to product drawings) are not allowed to have shrinkage, pores, sand clothing, slag eyes, flash and other defects
core) The surface of the contact surface between the aluminum part and the wire, the part connected with other parts, the compression part of the connecting pipe and the die, and the part with anti-corona requirements, are not allowed to have defects such as sand swelling, scarring, and bulges; d) The electrical contact plane of the aluminum part is not allowed to have defects such as dents, scratches, pits, and indentations. 3.7.4 Surface quality of welded parts:
a) The weld should be fine and flat with fine scales, and the edge should be sealed, with the undercut depth not greater than 1mm; b) The weld should be free of defects such as cracks, pores, slag inclusions, etc. 3.7.5 Surface quality of fasteners:
a) There should be no zinc nodules, zinc slag, or zinc ash on the surface of fasteners; b) External and internal threads should be smooth;
c) There should be no cracks on screws and nuts.
4 Classification requirements
4.1 Suspension wire
4.1.1 The plumb line clamp should take into account various use conditions such as wire or wrapped wire. 4.1.2 For ship-type suspension wire clamps, the curvature flat diameter of the hull wire trough should not be less than 8 times the diameter of the conductor or ground wire. 4.1.3 Any type of suspension wire clamp should have a water axis that allows the hull to rotate in the vertical plane. Its position should be in the plane of the conductor axis, or above or below the plane of the conductor axis. 4.1.4 The suspension wire clamp should clearly provide the limited range of use, maximum exit angle, minimum exit angle and allowable rotation angle, etc. 4.1.5 The design of the suspension wire clamp should consider reducing the impact of breeze vibration on the conductor and ground wire, and should avoid stress concentration or damage to the conductor and ground wire.
4.1.6 The ratio of the holding force of the fixed suspension clamp on the conductor and the ground wire to the calculated breaking force of the conductor and the ground wire shall not be less than the requirements of Table 1: Stranded wire category
Copper core aluminum stranded wire, steel core aluminum alloy stranded wire
Steel stranded wire
Steel stranded wire, aluminum clad steel corrugated wire
Lead stranded wire Key alloy corrugated wire
CB 23141997
Table 1 Percentage of the holding force of the suspension clamp and the calculated breaking force of the stranded wire Pot steel cross-section ratio
4. 0~- 4, 5
7. 0~8. 0
11.0~20.0
Percentage (%)
4.1.7 There should be sufficient contact surface between the suspension clamp and the installed conductor and ground wire to reduce the damage caused by fault current. 4.2 Tension clamps, joint fittings and contact fittings 4.2.1 Fittings that bear electrical loads, whether they bear tension or not, should not reduce the conductivity of the wire. 4.2.2 Fittings used for electrical connections should meet the requirements of GB2317. 4.2.3 Fittings that are required to withstand electrical load performance should meet the following requirements: a) The resistance between the two end points of the wire connection, for compression fittings, should not be greater than the resistance of the wire of the same length; for non-compression fittings, it should not be greater than 1.1 times the resistance of the wire of the same length; b) The temperature rise at the wire connection should not be greater than the temperature rise of the connected wire; c) The current carrying capacity of all fittings that bear electrical loads should not be less than the current carrying capacity of the installed wire. 4.2.4 The gripping force of the tension clamp, joint fittings and contact fittings on the conductor and ground wire, and the ratio of the gripping force of the conductor and ground wire to the calculated breaking force of the conductor and ground wire shall not be less than the provisions in Table 2:
Table 2 Percentage of the gripping force of the tension clamp, joint fittings and contact fittings and the calculated breaking force of the stranded wireMetal type
Compression type joint pipe and tension clamp
Compression type tension clamp
T-type clamp and equipment clamp (contact fittings)Note: For the extra-large cross-section conductor, expanded diameter conductor and continuous wire, the gripping force can be 65%. Percentage (%)
4.2.5 When the curved extension of the non-compression type tension clamp contacts the conductor under tension, the radius of curvature at the exit of the curved extension shall not be less than 8 times the diameter of the installed conductor. 4.2.6 Conductive grease should be applied to the conductive contact surface of the fittings. Conductive grease to prevent oxidation corrosion should be provided for shrinkage fittings to fill the gaps inside the fittings.
4.2.7 All compression fittings should minimize the internal pores to prevent moisture from entering during operation. 4.2.8 The connection between the tension clamp and the contact fittings and the conductor should avoid the problem of bimetallic corrosion between two different metals. 4.2.9 The tension clamp connection and contact fittings should consider that there is no increase in the stress of the conductor at the original contact surface between the conductor and the fitting after installation to prevent the conductor from being damaged by breeze vibration or other conductor vibration conditions. 4.2.10 The tension clamp connection and contact fittings should avoid stress concentration to prevent excessive metal cold deformation of the conductor or ground wire. 4.3 Protective fittings
4.3.1 Electrical protective fittings should be able to withstand breeze vibration without causing damage. 4.3.2 The electrical protection hardware should be able to withstand a certain static mechanical load, and the voltage-equalizing shielding hardware should ensure safe support of the weight of an individual.
GH 2314·-1997
4.3.3 The repair pipe should be repaired when the number of broken strands in the outermost layer of the conductor is not more than 1/3. 4.3.4 The requirements for anti-vibration should be in accordance with GB2336 and the requirements for spacing should be in accordance with G1B2338. 4.4 Busbar hardware
4.4.1 Each line fixing hardware should be able to withstand bending load, and its value should match the requirements of the installed high-voltage branch insulator. 4.4.2 The busbar expansion joint should withstand an expansion of 32 mm and 10 round trips without fatigue damage. 4.4.3 The copper and aluminum transition hardware manufactured by flash welding or friction welding should be able to withstand 180° bending without welding lamp breakage at the copper-aluminum welding point. Copper-aluminum reverse transition fittings manufactured by brazing technology and cold-rolled copper-aluminum transition composite sheets shall be subjected to copper plate peeling test, and the composite area of copper and aluminum surfaces shall not be less than 75% of the total contact surface. 5 Materials and anti-corrosion
5.1 The materials for manufacturing fittings shall be selected according to the specifications of the drawings (refer to Appendix A); or other materials that meet the requirements of use and are agreed by the user shall be selected.
5.2 The metal materials used to manufacture fittings shall meet the requirements of service life, and shall not be prone to intergranular or stress corrosion of metal materials, nor shall they cause corrosion of any part of the conductor or line. 5.3 The metal materials of medical shrinkage fittings shall be able to withstand the cold deformation of shrinkage products, and the steel shrinkage parts shall have sufficient impact strength after compression. Steel joints should be made of high-quality steel with a plastic content of no less than 0.15%, and lead compression parts should be made of chrome with a purity of no less than 99.5%.
5.4 Use insensitive steel as much as possible. If sensitive steel must be used, avoid severe cold processing. Hardware used in high-cold areas should avoid using cold materials.
5.5 Hardware made of copper alloy materials should have a copper content of no less than 80%. 5.6 Hardware made of non-metallic core materials should have good anti-aging performance, can withstand the working temperature without performance degradation, and should have sufficient anti-ozone, anti-ultraviolet and anti-air pollution capabilities within the working humidity range. 5.7 All metal and its ferrous metal parts, except stainless steel parts and gray cast iron, should be treated with hot-dip galvanizing in accordance with CB5958. The minimum quality of the zinc layer is 460g/m2, and the screw and washer are 380g/tm2. Other methods agreed by both parties can also be used to obtain equivalent anti-glass performance.
5.B When two metals with low contact potential are in contact with each other, special measures must be taken to avoid potential corrosion and reduce contact resistance. This requirement also applies to some metal parts that are in direct contact with the wire. 5.9 The external thread of the fastener shall be processed or machined according to GB196 standard before hot-dip galvanizing, and then hot-dip galvanized. The internal thread can be added before or after hot-dip galvanizing. The matching of external thread and internal thread shall meet the 7H/8g precision standard. If it is processed after hot-dip galvanizing, it shall be coated with anti-magnetic grease:
The external thread of the hardware is not allowed to reduce the external diameter of the thread under any circumstances; the internal thread is allowed to expand, the shearing rod is not allowed to shrink, and the rod diameter of the screw not controlled by shearing shall not be less than the thread diameter. 6 Structural and dimensional tolerances
6.1 The thread of the shearing bolt is allowed to enter the load-bearing plate to a depth of no more than one-third of the thickness of the plate: 6.2 The width of the hanging plate of the L-type hanging plate connection method should not be greater than 100mm. Otherwise, the groove connection type with the whole plate drilled should be adopted. 6.3 All kinds of wire clamps and connecting metals that contact the wire and the ground wire should be made into a smooth trumpet shape. 6.4 The structure of the metal should avoid the possibility of water accumulation. 6.5 The connection dimensions of the ball and the clevis should comply with the provisions of GB4056. 6.6 The size and tolerance of the metal fittings should ensure that the metal fittings meet the specified mechanical and electrical performance requirements. The size of the galvanized metal fittings is the size after galvanizing.
6.7 For the parts with size deviation, the limit deviation should comply with the following provisions! a) When the basic size of the metal fitting is less than 0 mm, the allowable limit deviation is ±1.0 mm: GB 2314—1997
b) When the basic size of the metal fitting is greater than 50 mm, the allowable limit deviation is ±2% of the basic size. 6.8 The limit deviation of the width of the plate at the bend should comply with the provisions of GB1804. JS-14 grade is selected. 6.9 The minimum limit deviation of the basic dimensions of stampings, forgings and hot-bent rods shall comply with the requirements of the drawing group. The unmarked tolerance shall be selected according to the provisions of GB1804 and JS14 grade. 6.10 The limit deviation of the outer diameter and inner diameter of the steel connecting pipe shall comply with the provisions of Table 3: Table 3 Limit deviation of the outer diameter and inner diameter of the steel connecting pipe External
Basic size
>14~22
>22~-34
Pole installation difference
0.2---0.3
0. 2 ~ — 0. 4
Basic size
6.11 The limit deviation of the outer diameter and inner diameter of the extruded lead pipe shall comply with the provisions of Table 4: Table 1 Limit deviation of the outer diameter and inner diameter of the extruded aluminum tube Diameter
Basic size
≥32--50
5J--B0
7 Structural process requirements
Limit deviation
7.1 The bending processing of hardware parts shall be carried out before galvanizing. The basic size
>22~36
Limit deviation base
Limit deviation
7.2 The bending and twisting processing of steel plates shall be hot forming. During the whole process of bending and forming operations, the material shall be kept at 850-920℃ and cooled in air after the operation. The minimum inner diameter of the hot-formed bend should not be less than the thickness of the bent steel plate. 7.3 For U-shaped fittings that must be cold-formed, the ratio of the radius of curvature to the plate thickness or bar diameter shall not be less than 2.5. 7.4 All parts that are cold-formed such as \ should be annealed. When the plate edge is cold-sheared, the surface edge of the plate should be ground or machined to a solid drive with a radius of not less than 1.5 mm. The section of this arc-avoiding edge should be on the entire curved surface of the bending process and extend 12 mm on both sides. 7.5 All parts that are cold-formed, such as cold-bending and cold-punching, should be annealed before zinc bonding to eliminate stress. 7.6 The Brinell hardness of drawn and extruded aluminum arms shall not exceed HR25, and the tensile strength shall not be less than 80N/mm: the hardness of the steel pipe shall not exceed H3137, and the tensile strength shall not be less than 375.V/mm2.
8 Marking and Packaging
8.1 The marking position and size of the hardware should be in accordance with the requirements of the detailed drawing, 8.2 The marking and packaging of hardware should comply with the requirements of GB2317. A1 Material standards
GB470-83 Zinc ingots
GB 2314—1997
Appendix A
(Appendix to the standard)
Material standards and fastener standards
GB699—88 Technical conditions for high-quality carbon structural steel GB700—88 Carbon structural steel
GB1173—1995 Cast aluminum alloys
GB1196—93 Aluminum ingots for remelting
GB1200—88 Galvanized steel strands
GB1220—92 Stainless steel bars
GB1348—88
3 Ductile iron castings
GB 2040—89
Pure copper plates
GB31901996 Chemical composition of deformed aluminum and aluminum alloys GB 3193—-82
GB 3196-82
GB 443784
GR6982---86
GR8162-87
GB 9439—88
GB 9440—&8
Aluminum and aluminum alloy hot-rolled plates
Aluminum and aluminum alloy wire for rivets
Aluminum and aluminum alloy hot extruded pipes
Aluminum and aluminum alloy hot extruded profiles for industrial use
Hot-rolled seamless steel pipes for structures
Gray cast iron
Forgeable cast iron
GB 11352—89
A2 fastener standard
GB 12---88
GB41-86
GB 67-85
GB 68—85
GB 93—87
GB 95—85
Casting carbon steel parts for general engineering
Smooth round head square neck bolts
Regular hexagonal nuts Grade C
Slotted pan head screws
Slotted countersunk head screws
Standard spring washers
Flat washers Grade C
GB1972—92Butterfly springs
GB 5780—86Hexagonal head screws Grade C
GB5781—86Hexagonal head bolts with full thread Grade CSD25—82Hexagonal head bolts with pin holes
SD 26--82Closed pins
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.