GB 50217-2018 English PDFUS$1929.00 · In stock
Delivery: <= 12 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 50217-2018: Standard for design of cables of electric power engineering Status: Valid GB 50217: Historical versions
Basic dataStandard ID: GB 50217-2018 (GB50217-2018)Description (Translated English): Standard for design of cables of electric power engineering Sector / Industry: National Standard Classification of Chinese Standard: P60 Word Count Estimation: 190,188 Date of Issue: 2018-02-08 Date of Implementation: 2018-09-01 Older Standard (superseded by this standard): GB 50217-2007 Regulation (derived from): Ministry of Housing and Urban-Rural Development Announcement No. 1827 of 2018 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation GB 50217-2018: Standard for design of cables of electric power engineering---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 This standard is formulated in order to make the design of power engineering cables advanced in technology, economical and reasonable, safe and applicable, and convenient for construction and maintenance. 1.0.2 This standard applies to the selection and laying design of 500kV and below power cables and control cables in new construction, expansion and reconstruction of power projects such as power generation, power transmission and transformation, and power distribution. This standard does not apply to the following environments. underground mines; environments for manufacturing, applying or storing gunpowder, explosives and primers, fuzes and pyrotechnics production; water, land and air transportation vehicles; nuclear island parts of nuclear power plants. 1.0.3 In addition to this standard, the cable design for power engineering shall also comply with the current relevant national standards. 2 terms 2.0.1 Flame retardant cables Cables with specified flame-retardant properties (such as flame-retardant properties, smoke density, smoke toxicity, corrosion resistance). 2.0.2 fire resistant cables Cables with specified fire resistance properties (such as line integrity, smoke density, smoke toxicity, corrosion resistance). 2.0.3 Metallic-plastic composite water barrier The water-blocking layer is composed of a thin metal sleeve such as aluminum or lead foil sandwiched in a plastic layer and a special composite tape is surrounded along the longitudinal direction of the cable. 2.0.4 thermal resistance The thermal network analysis method is used to calculate the current carrying capacity of the cable, and the physical quantity defined by the thermal Ohm's law of the one-dimensional heat dissipation process is used. 2.0.5 Auxiliary ground wire Configure a wire parallel to the high-voltage AC single-core power cable line, grounded at both ends to form a loop for the induced current. 2.0.6 direct burying The cable is laid into the underground trench with a cushion layer along the bottom of the trench and a covering layer on the cable, and the laying method is to add a protective plate and then bury the floor. 2.0.7 Shallow channel A covered trough structure that accommodates a small number of cables without brackets. 2.0.8 Manhole It is specially used for accommodating accessories such as cable joints or covered pit-type cable structures required for pulling cables. 2.0.9 Cable building A general term for structures such as cable trenches, shallow grooves, pipes, tunnels, interlayers, vertical (inclined) wells and working wells that are specially used for laying cables or placing accessories. 2.0.10 Flexible fixed slip fixing A fixing method that enables the cable to change its axial angle along the fixed position or move slightly laterally with thermal expansion and cold contraction. 2.0.11 rigid fixing rigid fixing A clamping and fixing method that prevents the cable from being displaced with thermal expansion and contraction. 2.0.12 Snaking of cable According to the requirements of quantitative parameters, the axial thermal stress of the cable can be reduced or the free expansion and contraction can be increased so that the cable is laid in a serpentine shape. 3 Cable type and section selection3.1 Power cable conductor material 3.1.1 Copper conductors shall be used for power cables used in the following situations. 1 Motor excitation, important power supply, mobile electrical equipment, etc. need to be connected to circuits with high reliability; 2 Vibrating places, working environments with explosion hazards or corrosion to aluminum; 3 fire-resistant cables; 4 Arranged close to high-temperature equipment; 5 crowded places; 6 Conventional islands of nuclear power plants and auxiliary facilities related to production. 3.1.2 Except that the products only have copper conductors and the article 3.1.1 of this standard determines that copper conductors should be used, the cable conductor material can be copper conductors, aluminum or aluminum alloy conductors. Aluminum alloy conductors should not be used for cables with a voltage level above 1kV. 3.1.3 The cable conductor structure and performance parameters shall comply with the current national standards "Electrical Copper Round Wire" GB/T 3953, "Electrical Round Aluminum Wire" GB/T 3955, "Cable Conductor" GB/T 3956, "Cable Conductor Aluminum alloy wire" GB/T 30552 and other regulations. 3.2 Insulation level of power cables 3.2.1 The phase-to-phase rated voltage of the power cable conductors in the AC system shall not be lower than the working line voltage of the circuit used. 3.2.2 The selection of the rated voltage between the power cable conductor and the insulation shield or the metal sheath in the AC system shall comply with the following regulations. 1 The neutral point is directly grounded or through a low-resistance grounding system, and the grounding protection action does not exceed 1min to remove the fault, and it should not be lower than 100% of the working phase voltage of the operating circuit; 2 For the power supply system where the single-phase ground fault may exceed 1min, the operating phase voltage of the operating circuit should not be lower than 133%; when the single-phase ground fault may last for more than 8h, or when the safety requirements of the generator circuit are high, 173% should be used % of the working phase voltage of the used loop. 3.2.3 The withstand voltage level of the cables in the AC system should meet the requirements for system insulation coordination. 3.2.4 The insulation level of DC transmission cables should be able to withstand the withstand voltage assessment of polarity reversal, DC and impact superposition, etc.; XLPE insulated cables should have the ability to suppress the accumulation of space charges and the formation of local high field strength, etc. to adapt to DC electric field operation characteristics. 3.3 Power cable insulation type 3.3.1 The selection of power cable insulation type should meet the following requirements. 1 Under the conditions of working voltage, working current and its characteristics and environmental conditions, the cable insulation life should not be less than the expected service life; 2 It should be selected according to factors such as operational reliability, construction and maintenance convenience, maximum allowable working temperature and cost; 3 It should meet the requirements of fire resistance and flame retardancy of cables; 4 It should meet the requirements of environmental protection. 3.3.2 The insulation type selection of commonly used power cables shall meet the following requirements. 1 Low-voltage cables should use XLPE or PVC extruded insulation types. When environmental protection requires, PVC insulated cables should not be used; 2 High-voltage AC cables should use cross-linked polyethylene insulation type, or self-contained oil-filled cables; 3 500kV AC submarine cable line can choose self-contained oil-filled cables or XLPE insulated cables; 4 High-voltage DC transmission cables can use non-drip impregnated paper insulation, self-contained oil-filled types and XLPE insulation types suitable for HVDC cables, and ordinary XLPE insulation types should not be used. 2 When there are reinforcing layers such as copper strips in both the radial direction and the longitudinal direction, the allowable height difference shall be 80m; when it is used for important circuits, it should be 60m. 3.4.3 When laying directly buried, the selection of cable sheath should meet the following requirements. 1 When the cable is subjected to high pressure or is in danger of mechanical damage, it should have a reinforcement layer or steel tape armor; 2 In the soil where displacement may occur, such as quicksand layer and backfill land zone, the cable shall be armored with steel wire; 3 For extruded cables used in areas seriously endangered by termites, outer sheaths with higher hardness should be selected, or thin outer sheaths with higher hardness can be extruded on ordinary outer sheaths. The material can be nylon or special polyolefin copolymerized Objects, etc., can also be armored with metal sleeves or steel tapes; 4 In addition to the conditions specified in paragraphs 1 to 3 of this article, the outer sheath without armor can be used; 5 In areas with high groundwater level, polyethylene outer sheath should be selected; 6 High-voltage XLPE insulated cables above 35kV should have a waterproof structure. 3.4.4 For fixed laying in the air, the selection of cable sheath should meet the following requirements. 1 In places with high safety requirements and serious rodent infestation, such as underground passenger transportation and commercial facilities, plastic insulated cables should be armored with metal tape or steel tape; 2 When the cables are under high-drop stress conditions, the multi-core cables should be armored with steel wires, and the AC single-core cables should comply with the provisions of Item 1 of Article 3.4.1 of this standard; 3 Cables laid on bridges with dense supports do not need armoring; 4 When environmental protection requires, the outer sheath of polyvinyl chloride shall not be used; 5 In addition to the provisions of Items 3 to 5 of Article 3.4.1 of this standard and Item 4 of this Article, and cables with heat-resistant outer sheaths such as polyethylene should be used in places with high temperatures above 60 °C, other cables should be made of polyethylene. Vinyl chloride outer sheath. 3.4.5 For mobile electrical equipment and other cables that are often bent and moved or have loops that require high flexibility, rubber outer sheaths should be used. 3.4.6 Cables in places where radiation is exposed should have outer sheaths such as polyvinyl chloride, neoprene rubber, and chlorosulfonated polyethylene suitable for withstanding radiation intensity. 3.4.7 Cables laid in protective tubes should have extruded outer sheaths. 3.4.8 When laying underwater, the cable sheath selection should meet the following requirements. 1 In ditches, unnavigable creeks and other cables that do not require the armor layer to bear the tension, steel tape armor can be used; 2 For cables laid in rivers, lakes and seas, the selected steel wire armor type should meet the stress conditions; when the laying conditions have protection requirements such as mechanical damage, the outer sheath that meets the protection and corrosion resistance enhancement requirements can be selected; 3 Submarine cables should be armored with galvanized steel wire, stainless steel wire or copper armor with good corrosion resistance, and aluminum armor should not be used. 3.4.9 When the path passes through different laying conditions, the choice of cable sheath should meet the following requirements. 1 When the total length of the line does not exceed the cable manufacturing length, it is advisable to select the same type or more than one type with small differences that meet the conditions of the entire line; 2 When the total length of the line exceeds the manufacturing length of the cable, different types can be selected according to the corresponding sections. 3.4.10 The outer sheath of nuclear safety level (level 1E) cables laid in conventional islands of nuclear power plants and auxiliary facilities related to production shall comply with the current national standard "General Requirements for Level 1E Cables for Nuclear Power Plants" GB/T 22577 Regulation. 3.4.11 The shielding requirements for power cables above 1kV in nuclear power plants shall comply with the relevant provisions of the current industry standard "Code for Design and Installation of Cable Systems in Nuclear Power Plants" EJ/T 649. 3.5 Number of cores of power cables 3.5.1 When the neutral point of the power supply of 1kV and below is directly grounded, the selection of the number of cable cores for the three-phase circuit shall meet the following requirements. 1 When the protective conductor is connected to the ground with the exposed conductive parts of the powered equipment, it shall meet the following requirements. 1) For TN-C system, when the protective conductor and the neutral conductor share the same conductor, a 4-core cable should be selected; 2) In the TN-S system, when the protective conductor and the neutral conductor are independent, a 5-core cable should be used; when the provisions of Article 5.1.16 of this standard are met, a 4-core cable and another one laid close to the phase conductor can also be used. Protective conductor composition; 3) In the TN-S system, if the neutral conductor is not provided or the circuit does not require the neutral conductor to lead to the receiving equipment, a 4-core cable should be used; when the requirements of Article 5.1.16 of this standard are met, a 3-core cable can also be used. The core cable is composed of another protective conductor laid close to the phase conductor. 2 TT system, when the protective grounding of the exposed conductive parts of the powered equipment and the neutral point grounding of the power system are independent, a 4-core cable should be used; when the neutral conductor is not distributed or the circuit does not need a neutral conductor to lead to the powered equipment, should choose 3-core cable. 3 TN system, when the exposed conductive parts of the powered equipment are reliably connected to the public grounding grid distributed in the whole plant and station, 3-core cables should be used for electrical equipment such as motors that are fixed and do not require neutral conductors. 4 When the cross-section of the phase conductor is greater than 240mm2, a single-core cable can be used, and the cross-section of the neutral conductor and protective conductor of the circuit should meet the requirements of Article 3.6.9 and Article 3.6.10 of this standard. 3.5.2 When the neutral point of the 1kV and below power supply is directly grounded, the selection of the number of cable cores for the single-phase circuit shall comply with the following regulations. 1 When the protective conductor is connected to the ground with the exposed conductive parts of the powered equipment, it shall meet the following requirements. 1) For TN-C system, when the protective conductor and the neutral conductor share the same conductor, a 2-core cable should be used; 2) In the TN-S system, when the protective conductor and the neutral conductor are independent, a 3-core cable should be used; when the provisions of Article 5.1.16 of this standard are met, a 2-core cable and another one laid close to the phase conductor can also be used. Protective conductor composition. 2 TT system, when the protective grounding of the exposed conductive parts of the powered equipment and the neutral point grounding of the power system are independent, a 2-core cable should be used. 3 TN system, when the exposed conductive parts of the receiving equipment are reliably connected to the public grounding grid distributed in the whole plant and station, 2-core cables should be used for fixed installation of electrical equipment. 3.5.3 The selection of the number of cable cores for the 3kV ~ 35kV three-phase power supply circuit shall meet the following requirements. 1 When the circuit with large working current or the cable is laid underwater, single-core cable can be selected; 2 Except for the conditions specified in paragraph 1 of this article, 3-core cables shall be used; 3-core cables may be of the common turnkey type or 3 single-core cables twisted. 3.5.4 For the 110kV three-phase power supply circuit, except that 3-core cables can be used when laying underwater, single-core cables should be used. Single-core cables should be used for three-phase power supply circuits above 110kV. 3.5.5 Single-phase power cables for mobile electrical equipment should use 3-core soft rubber cables, three-phase three-wire system power cables should use 4-core soft rubber cables, and three-phase four-wire system power cables should use 5-core soft rubber cables. 3.5.6 The selection of the number of cable cores for the DC power supply circuit shall meet the following requirements. 1 The low-voltage DC power supply system should use a 2-core cable, or a single-core cable; when the lead-out wire of the battery pack is a cable, a single-core cable should be used, or a multi-core cable can be used in parallel as one pole. The positive and negative poles of the battery cable 1 cable should not be shared; 2 Single-core cables should be used for high-voltage direct current transmission systems, and 2-core cables can also be used when laying underwater. 3.6 Power cable conductor cross section 3.6.1 The cross-section selection of power cable conductors should meet the following requirements. 1 The temperature of the cable conductor under the action of the maximum operating current shall not exceed the maximum allowable value of the cable insulation, and the operating temperature of the cable conductor of the continuous working circuit shall comply with the provisions of Appendix A of this standard; 2 The cable conductor temperature under the action of the maximum short-circuit current and short-circuit time shall comply with the provisions of Appendix A of this standard; 3 Under the action of the maximum operating current, the voltage drop of the connecting circuit shall not exceed the allowable value of the circuit; 4 In addition to complying with the requirements of paragraphs 1 to 3 of this article, the section of power cables of 10kV and below should be selected according to the principle of comprehensive economy of the initial investment of the cable and the operation cost during the service life; the economical current section of power cables of 10kV and below The selection method and economic current density curve should comply with the provisions of Appendix B of this standard; 5 The minimum cross-section of multi-core power cable conductors, the copper conductor should not be less than 2.5mm2, and the aluminum conductor should not be less than 4mm2; 6 For cables laid underwater, when the conductor is required to bear the tensile force and it is reasonable, the section can be selected according to the tensile requirements; 7.The conductor cross section of long-distance power cables should also be determined by comprehensively considering the transmitted active power, cable length, high-voltage shunt reactor compensation and other factors. 3.6.2 When determining the allowable minimum cross-section of cable conductors for 10kV and below common cables according to 100% continuous working current, it shall comply with the provisions of appendix C and appendix D of this standard. The difference effect is factored into the correction factor. 1 Ambient temperature difference; 2 The difference in soil thermal resistivity when directly buried; 3 The influence of multiple parallel cables; 4 The influence of sunlight when overhead laying is done outdoors without sunshade. After correction, the actual allowable value of the current carrying capacity of the cable should be greater than the operating current of the circuit. 3.6.3 In addition to the provisions of Article 3.6.2 of this standard, when determining the allowable minimum section of the cable conductor according to 100% continuous operating current, it shall be verified by calculation or test, and shall meet the following requirements. 1 For power supply circuit cables containing hi......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50217-2018_English be delivered?Answer: Upon your order, we will start to translate GB 50217-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 8 ~ 12 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB 50217-2018_English with my colleagues?Answer: Yes. 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