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Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
Code for design of cables of electric work
50217—94
Code for design of cables electric work
1994—11—05
1995—07—01
State Bureau of Technical Supervision
Jointly Issued
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
Code for design of cables of electric GB50217-94
Editor: Ministry of Electric Power Industry of the People's Republic of ChinaApproval: Ministry of Construction of the People's Republic of ChinaEffective Date: July 1, 1995
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of the National Standard "Electric Power Engineering Cable Design Specification"
Construction Standard [1994] No. 671
According to the requirements of the State Planning Commission's Document No. [1987] 2390, the national standard "Electric Power Engineering Cable Design Specification" edited by the Ministry of Electric Power Industry and jointly formulated with relevant departments has been reviewed by relevant departments. The "Electric Power Engineering Cable Design Specification" GB50217-94 is now approved as a mandatory national standard and will be implemented from July 1, 1995. The Ministry of Electric Power Industry is responsible for the management of this specification, and the Southwest Electric Power Design Institute is responsible for its specific interpretation, and the Ministry of Construction's Standard and Quota Research Institute is responsible for organizing its publication and distribution. Ministry of Construction of the People's Republic of China
November 5, 1994
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Cable type and cross-section selection
Cable core material...
Number of power cable cores
Cable insulation level.
Cable insulation type
Cable outer sheath type
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3.6 Control cable and its metal shield
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Cross-section of power cable
Selection and configuration of cable accessories
General provisions
Oil supply system of self-contained oil-filled cable
Cable laying·
General provisions
Choice of laying method
Direct burial in the ground
Laying in protective pipe
Laying in cable structures
Laying in other public facilities
Laying underwater
Support and fixation of cables..
General provisions
Cable bracket
Full text of engineering construction standards Information System
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Engineering Construction Standard Full Text Information System
7 Cable Fire Prevention and Prevention of Spread of Flame…
Appendix A
Maximum Allowable Temperature of Common Power Cables
Appendix B
Appendix C
Appendix DwwW.bzxz.Net
Appendix E
Appendix F
Appendix G
Permitted Continuous Current Carrying Capacity of Common Power Cables of 10kV and Below (Construction (Controversial basic value)
Correction coefficient of the allowable continuous current carrying capacity of cables under different laying conditions·
Method for calculating the allowable minimum cross-section of cable core according to short-circuit thermal stability conditions
Additional length for laying measurement of cables of 35kV and below…Calculation method for the maximum allowable pipe length when cables are laid through pipes Explanation of terms used in this specification
Additional explanation
Engineering construction standard full text information system
Engineering construction standard full text information system
This specification is formulated to make the design of power engineering cables technologically advanced, economically reasonable, safe and applicable, and easy to construct and maintain. 1.0.2 This specification applies to the selection and laying design of power cables and control cables of 200kV and below in new and expanded power projects. 3 In addition to complying with this specification, the cable design of power projects shall also comply with the provisions of the current relevant design specifications and standards of the state. 1.0.3
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2 Terminology
2.0.1 Fire resistance (fire resistance)
The property that the cable can maintain power operation under the action of flames at a specific high temperature and time. 2.0.2 Flame retardancy (flame retardance) The property that the cable can quickly extinguish itself after the fire source is removed after being burned under the action of flames under specific test conditions.
2.0.3 Dry-type cross-linked (dry-type cross-linked) The general term for the cross-linking process that can significantly reduce the moisture content in the manufacture of cross-linked polyethylene insulation materials.
2.0.4 Water tree
(water tree)
It is the abbreviation for the phenomenon of dendritic fine cracks in the insulation layer of cross-linked polyethylene cables during operation. It causes the insulation properties to deteriorate and causes cable failure. 2.0.5 Metal-Plastic Composite Water Barrier
A water barrier formed by a composite tape sandwiched between thin metal layers such as aluminum or lead foil and plastic along the cable.
2.0.6 Thermal resistance The calculation of the cable current carrying capacity adopts the thermal network analysis method and the physical quantity defined by the thermal Ohm's law of the one-dimensional heat dissipation process.
2.0.7 Return line (auxiliary ground wire, auxiliatygroundwire) A conductor parallel to the high-voltage single-core cable line with grounding at both ends to form a loop for the induced current.
2.0.8 Direct burying The cable is laid in an underground trench, with a soft soil layer covering the bottom of the trench and the cable, and a protective plate is installed and then buried flush with the ground. 2.0.9 Cable trough
A cable structure that is closed and not accessible but has an open cover, and is arranged flush with the floor or slightly above or below it.
2.0.10 Shallow trough
A covered trough structure that accommodates a small number of cables, does not contain brackets, and the bottom of the trough may not be sealed. It can be arranged flush with the floor or on the floor.
2.0.11 Tunnel
A cable structure that accommodates a large number of cables and has a convenient passage for installation and inspection, and is fully enclosed.
2.0.12 Mezzanine (cable junction room, switchcabin) A hall-type cable structure under the control room floor that can accommodate many cables for junction and is convenient for installation and activities.
2.0.13 Manhole
A small room-type cable structure that people can enter and exit to place cable joints and other accessories or for cable pulling operations.
2.0.14 Cable buildings: A general term for cable trenches, shallow troughs, tunnels, mezzanines, shafts and manholes used for laying cables or placing accessories.
2.0.15 Slip fixing: A fixing method that allows the cable to change its axial angle or slightly move laterally along the fixed position as it expands and contracts.
2.0.16 Rigid fixing: A clamping fixing method that prevents the cable from moving as it expands and contracts. 2.0.17 Snake laying of cable: A wavy laying method that reduces the axial thermal mechanical stress of the cable according to quantitative parameter requirements.
2.0.18 Ordinary bracket (cantilever bracket): A bracket made of rigid material with a cantilever form to support the cable. Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Cable tray (cable tray, cable tray) is the full name of the rigid structural system that has close support for cables, consisting of straight sections, bends, components, brackets (arm brackets), hangers, etc. of trays or ladders. 2.0.20 Cable bracket (cable brackets) is the general name of cable trays, ordinary brackets, and hangers. 2.0.21 Fireproof pillows are inflatable flexible pillow-shaped refractory materials used for fire blocking and easy operation. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3 Cable Type and Section Selection
1 Cable Core Material
1 Control cable should use copper core.
Power cables used in the following situations should use copper core: (1) Motor excitation, important power supply, mobile electrical equipment, etc., which need to maintain a high reliability circuit connection.
(2) Harsh working environments such as severe vibration, explosion hazard, or corrosion to aluminum.
(3) Fire-resistant cables.
3.1.3Power cables used in the following situations should use copper core: (1) Close to high-temperature equipment.
(2) Important public facilities with high safety requirements. (3) When the working current is large and the number of cables needs to be increased during underwater laying. 3.1.4 Except for the case where the product has only copper core and the case where copper core is determined to be appropriate in Articles 3.1.1 to 3.1.3 of this specification, the cable core material shall be aluminum core. 3.2 Number of power cable cores
When the neutral point of the power source of 11kV and below is directly grounded, the number of cores of the cable 3.2.1
in the three-phase circuit shall comply with the following provisions:
3.2.1.1 The case where the protective wire is connected to the exposed conductive part of the receiving equipment for grounding:
(1) When the protective wire and the neutral wire share the same conductor, a four-core cable shall be used. (2) When the protective wire and the neutral wire are independent, a five-core cable shall be used. When the provisions of Article 5.1.16 of this specification are met, a four-core cable and another protective wire conductor may also be used.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the grounding of the exposed conductive parts of the power receiving equipment and the grounding of the power supply system are independent, a four-core cable should be used. 3.2.2 When the neutral point of the power supply of 1kV and below is directly grounded, the number of cable cores in the single-phase circuit should comply with the following provisions:
3.2.2.1 When the protective wire is connected to the exposed conductive parts of the power receiving equipment for grounding:
(1) When the protective wire and the neutral wire share the same conductor, a two-core cable should be used. (2) When the protective wire and the neutral wire are independent, a three-core cable should be used: Under the condition of meeting the provisions of Article 5.1.16 of this Code, a two-core cable and another protective wire conductor can also be used.
2 When the grounding of the exposed conductive parts of the power receiving equipment and the grounding of the power supply system are independent, a two-core cable should be used. 3.2.3 For circuits with relatively large working current or for underwater laying, single-core cables may be used when the technology and economy are reasonable.
3.2.4 Except for the provisions of Articles 3.2.1, 3.2.2 and 3.2.3 of this Code, three-core cables should be used for AC power supply circuits.
3.2.5 For DC power supply circuits, two-core cables should be used; single-core cables may be used when necessary.
3.3 Cable insulation level
3.3.1 The phase-to-phase rated voltage of the power cable core in the AC system shall not be lower than the working line voltage of the service circuit.
3.3.2 The selection of the rated voltage between the power cable core and the insulation shield or metal sheath in the AC system shall comply with the following provisions: (1) For systems with directly grounded neutral points or low-impedance grounding, when the grounding protection action does not exceed 1 minute to clear the fault, it shall be 100% of the working phase voltage of the service circuit. (2) For power supply systems other than those in item (12), the voltage should not be lower than 133% of the working phase voltage of the service circuit. In cases where a single-phase grounding fault may last for more than 10 minutes or where the generator circuit has high safety requirements, the voltage should be 173% of the working phase voltage of the service circuit. Engineering Construction 6 Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The impulse withstand voltage level of cables in AC systems shall meet the insulation coordination requirements of the system.
The insulation level of power cables for DC transmission shall take into account load variation factors and meet the requirements of internal overvoltage.
3.3.5 The rated voltage of the control cable shall not be lower than the working voltage of the circuit and meet the requirements of transient and power frequency overvoltages that may be experienced. And it should comply with the following provisions:
(1) For control cables (guide cables) laid in parallel with longer high-voltage cables, the rated voltage shall be appropriate.
(2) For control cables installed in high-voltage distribution equipment of 220kV and above, 600/1000V should be used, or 450/750V can be used when good shielding is available. (3) Except for the cases of (1) and (2), 450/750V should generally be used; when the influence of external electrical interference is very small, a lower rated voltage can be used. 3.4 Cable insulation type
3.4.1 The selection of oil-impregnated paper insulated cable shall comply with the following provisions: (1) When the height difference between the highest and lowest points of the cable line does not exceed the allowable height difference of viscous oil-impregnated paper insulated cable (Table 3.4.1), viscous oil-impregnated paper insulated cable should be used.
(2) Except for the cases of (1), non-drip oil-impregnated paper insulated cable should be used. Permissible height difference rated voltage of viscous oil-impregnated paper insulated cable
Armored
Unarmored
Engineering Construction Standard Full Text Information System
Characteristics of cable lines
Permissible height difference2 The selection of the rated voltage between the cable core and the insulation shield or metal sheath of the power cable in the AC system shall comply with the following provisions: (1) For systems with direct neutral grounding or low impedance grounding, when the grounding protection action does not exceed 1 minute to clear the fault, it shall be 100% of the working phase voltage of the service circuit. (2) For power supply systems other than item (12), it should not be lower than 133% of the working phase voltage of the service circuit. In cases where the single-phase grounding fault may last for more than 1 second or where the safety requirements are high, such as in the generator circuit, 173% of the working phase voltage of the service circuit should be adopted. Engineering Construction 6 Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The impulse withstand voltage level of the cable in the AC system shall meet the system insulation coordination requirements.
The insulation level of the power cable for DC transmission shall take into account the load change factor and meet the requirements of internal overvoltage.
3.3.5 The selection of the rated voltage of the control cable shall not be lower than the working voltage of the circuit and meet the requirements of transient and power frequency overvoltage that may be experienced. And it should comply with the following provisions:
(1) Control cables (guide cables) laid in parallel with longer high-voltage cables should be of appropriate rated voltage.
(2) Control cables laid in high-voltage distribution devices of 220kV and above should be of 600/1000V, or 450/750V when well shielded. (3) Except for the cases of (1) and (2), 450/750V should be generally selected; when the influence of external electrical interference is very small, a lower rated voltage can be selected. 3.4 Cable insulation type
3.4.1 The selection of oil-impregnated paper insulated cables should comply with the following provisions: (1) When the height difference between the highest and lowest points of the cable line does not exceed the allowable height difference of viscous oil-impregnated paper insulated cables (Table 3.4.1), viscous oil-impregnated paper insulated cables should be used.
(2) Except for (1), non-drip oil-impregnated paper insulated cables should be used. Permissible height difference rated voltage of viscous oil-impregnated paper insulated cable
Armored
Unarmored
Engineering Construction Standard Full Text Information System
Characteristics of cable lines
Permissible height difference2 The selection of the rated voltage between the cable core and the insulation shield or metal sheath of the power cable in the AC system shall comply with the following provisions: (1) For systems with direct neutral grounding or low impedance grounding, when the grounding protection action does not exceed 1 minute to clear the fault, it shall be 100% of the working phase voltage of the service circuit. (2) For power supply systems other than item (12), it should not be lower than 133% of the working phase voltage of the service circuit. In cases where the single-phase grounding fault may last for more than 1 second or where the safety requirements are high, such as in the generator circuit, 173% of the working phase voltage of the service circuit should be adopted. Engineering Construction 6 Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The impulse withstand voltage level of the cable in the AC system shall meet the system insulation coordination requirements.
The insulation level of the power cable for DC transmission shall take into account the load change factor and meet the requirements of internal overvoltage.
3.3.5 The selection of the rated voltage of the control cable shall not be lower than the working voltage of the circuit and meet the requirements of transient and power frequency overvoltage that may be experienced. And it should comply with the following provisions:
(1) Control cables (guide cables) laid in parallel with longer high-voltage cables should be of appropriate rated voltage.
(2) Control cables laid in high-voltage distribution devices of 220kV and above should be of 600/1000V, or 450/750V when well shielded. (3) Except for the cases of (1) and (2), 450/750V should be generally selected; when the influence of external electrical interference is very small, a lower rated voltage can be selected. 3.4 Cable insulation type
3.4.1 The selection of oil-impregnated paper insulated cables should comply with the following provisions: (1) When the height difference between the highest and lowest points of the cable line does not exceed the allowable height difference of viscous oil-impregnated paper insulated cables (Table 3.4.1), viscous oil-impregnated paper insulated cables should be used.
(2) Except for (1), non-drip oil-impregnated paper insulated cables should be used. Permissible height difference rated voltage of viscous oil-impregnated paper insulated cable
Armored
Unarmored
Engineering Construction Standard Full Text Information System
Characteristics of cable lines
Permissible height difference
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