GB/T 12706.3-2020 PDF EnglishUS$585.00 · In stock · Download in 9 seconds
GB/T 12706.3-2020: Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV) - Part 3: Cables for rated voltages of 35 kV (Um=40.5 kV) Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 12706.3: Historical versions
Similar standardsGB/T 12706.3-2020: Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV) - Part 3: Cables for rated voltages of 35 kV (Um=40.5 kV)---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12706.3-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.060.20 K 13 Replacing GB/T 12706.3-2008 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1.2 kV) up to 35 kV (Um = 40.5 kV) - Part 3.Cables for rated voltages of 35 kV (Um = 40.5 kV) Issued on. MARCH 31, 2020 Implemented on. OCTOBER 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 4 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 10 4 Voltage designation and materials... 11 5 Conductors... 14 6 Insulation... 14 7 Shield... 15 8 Core, lining and filling of three-core cable... 16 9 Metal layer of single-core or three-core cable... 17 10 Metal shield... 17 11 Concentric conductor... 18 12 Lead sheath of the metal sheath... 19 13 Metal armor... 19 14 Outer sheath... 22 15 Test conditions... 24 16 Routine test... 24 17 Sample test... 26 18 Electrical type test... 33 19 Non-electrical type test... 37 20 Electrical tests after installation... 50 21 Supplementary terms for cable products... 51 Appendix A (Normative) Assumed calculation method for determining sheath dimensions... 52 Appendix B (Normative) Numerical rounding... 58 Appendix C (Normative) HEPR insulation hardness measurement... 60 Appendix D (Normative) Measurement method of semi-conducting shield resistivity ... 63 Appendix E (Normative) Water permeability test... 66 Appendix F (Normative) Tests on cable assemblies with longitudinal metal foil composite sheaths... 68 Appendix G (Normative) Supplementary terms for cable products... 71 References... 761 ScopeThis Part of GB/T 12706 specifies the structure, dimensions and test requirements for power cables with extruded insulation for a rated voltage of 35 kV fixedly mounted in distribution networks or industrial installations. This Part applies to cables of longitudinal water-blocking structure and their testing. This Part does not apply to cables with special installation and operation conditions, such as overhead cables, as well as cables used in the mining industry, in nuclear power plants (in and near containments), and underwater or on ships.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 156, Standard voltages GB/T 2951.11-2008, Common test methods for insulating and sheathing materials of electric and optical cables - Part 11.Methods for general application - Measurement of thickness and overall dimensions GB/T 2951.12-2008, Common test methods for insulating and sheathing materials of electric and optical cables - Part 12.Methods for general application - Thermal ageing methods GB/T 2951.13-2008, Common test methods for insulating and sheathing materials of electric and optical cables - Part 13.Methods for general application - Measurement for determining the density - Water absorption tests - Shrinkage test GB/T 2951.14-2008, Common test methods for insulating and sheathing materials of electric and optical cables - Part 14.Methods for general application - Test at low temperature3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 Terms related to size values 3.1.1 nominal value A specified quantity value, which is often used in the table. Note. In this Part, quantity values derived from nominal values are usually verified by measurement taking into account specified tolerances. 3.1.2 approximate value A value that is neither guaranteed nor checked. Note. The approximate value may be used for calculations of other dimensional values. 3.2.2 sample tests Tests carried out by the manufacturer at specified frequencies on finished cable samples or on certain components taken from the finished cable to check whether the cable complies with specified requirements. 3.2.3 type tests Tests carried out on normal commercial principles before supply of a type of cable covered by this Part to demonstrate that the cable has satisfactory performance under the intended conditions of use.4 Voltage designation and materials4.1 Rated voltage The rated voltage U0/U(Um) of the cables in this Part is marked as 21/35 (40.5) kV and 26/35 (40.5) kV. 4.3 Sheathing compounds See Table 4 for the maximum conductor temperatures of cables of different types of sheathing compounds.5 ConductorsThe conductor shall be the second type of metal-plated or non-metal-plated annealed copper conductor in compliance with GB/T 3956, or the second type of aluminum or aluminum alloy conductor. The second conductor can also be of a longitudinal water- blocking structure.6 Insulation6.1 Materials The insulation shall be an extruded dielectric as listed in Table 2. The insulation of halogen-free cables shall comply with the requirements in Table 5. 6.2 Insulation thickness See Table 6 for nominal insulation thickness. The thickness of any isolation layer or semiconductive shielding layer outside the conductor or insulation shall not be included in the insulation thickness.7 Shield7.1 General All cables shall have a phase-separated metal shield on the insulated cores. The shield of the insulated core of a single-core or three-core cable shall consist of a conductor shield and an insulation shield. 7.3 Insulation shield The insulation shield shall be composed of a non-metallic semiconducting layer and a metal layer.8 Core, lining and filling of three-core cable8.1 General Each insulated core of the three-core cable core shall have a metal shielding layer. 8.2 and 8.3 do not apply to cable cores of sheathed single-core cables. 8.2 Lining and filling 8.2.1 Structure An extruded lining shall be used. It is allowed to tighten with suitable tape before extruding the lining layer. 8.2.3 Extruded lining See Table 7 for the nominal thickness of the extruded lining. 8.3 Cable cores with phase-separated metal layers (see Chapter 10) The metal layers of the individual insulated cores shall be in contact with each other. If the phase-separated metal shielded cable core of a cable has another overall metal layer of the same metal material (see Chapter 9), the cable core shall be covered with a lining on the outside.9 Metal layer of single-core or three-core cableThis Part includes the following types of metal layers.10 Metal shield10.1 Structure Metal shield shall consist of one or more concentric layers of metal strips, metal braids, metal wires, or a combination of metal wires and metal strips. The metal shield may be a metallic sheath or, in the case of overall shield, armor complying with 10.2. 10.2 Requirements 10.2.1 The resistance of copper wire shield in metal shield shall comply with the requirements of GB/T 3956 when applicable. The nominal cross-section of the copper 10.2.3 The metal shield of cables with a nominal cross-sectional area of 500 mm2 and above shall adopt a copper wire shielding structure.11 Concentric conductor11.1 Structure The gap between concentric conductors shall comply with the requirements of 10.2.3. When selecting concentric conductor structures and materials, special consideration shall be given to the possibility of corrosion, which is not only for mechanical safety but also for electrical safety. 11.2 Requirements The size, physical properties and resistance requirements of concentric conductors shall comply with the provisions of 10.2. 11.3 Use If a concentric conductor structure is required, the concentric conductor layer can be covered outside the lining of the three-core cable or, for single-core cables, directly on the insulation, on the semi-conductive insulation shielding layer, or on the appropriate lining.12 Lead sheath of the metal sheathThe lead sheath shall be made of lead or lead alloy, with a seamless lead pipe of appropriate tightness formed. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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