GB/T 31489.2-2020 English PDFUS$339.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 31489.2-2020: D. C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 2: D. C. land cables Status: Valid
Basic dataStandard ID: GB/T 31489.2-2020 (GB/T31489.2-2020)Description (Translated English): D. C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 2: D. C. land cables Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: K13 Classification of International Standard: 29.060.20 Word Count Estimation: 18,119 Date of Issue: 2020-12-14 Date of Implementation: 2021-07-01 Quoted Standard: GB/T 494-2010; GB/T 2951.11-2008; GB/T 2951.12-2008; GB/T 2951.13-2008; GB/T 2951.14-2008; GB/T 2951.21-2008; GB/T 2951.31-2008; GB/T 2951.32-2008; GB/T 2951.41-2008; GB/T 3048.4; GB/T 3048.8; GB/T 3048.11; GB/T 3048.13; GB/T 3048.14; GB/T 3880.1--2012 Regulation (derived from): National Standard Announcement No. 28 of 2020 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration Summary: This standard specifies the use characteristics, product naming, technical requirements, cable markings, tests, acceptance rules, packaging, transportation and storage, and tests after installation of XLPE insulated land power cables for DC transmission with a rated voltage of 500 kV and below. This standard applies to cross-linked polyethylene insulated DC land power cables with a rated voltage of 500 kV and below that are used under normal installation and operating conditions. GB/T 31489.2-2020: D. C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 2: D. C. land cables---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. National Standards of People's Republic of China For DC transmission with rated voltage of 500kV and below Extruded insulation power cable system Part 2.DC land cables State Administration for Market Regulation Released by the National Standardization Management Committee 1 ScopeThis part of GB/T 31489 specifies XLPE insulated land power cables for direct current transmission with a rated voltage of 500kV and below The use characteristics, product names, technical requirements, cable marks, tests, acceptance rules, packaging, transportation and storage, and post-installation tests. This part applies to cross-linked polyethylene insulated direct current land power supplies with a rated voltage of 500kV and below used under normal installation and operating conditions. power cable.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document pieces. For undated references, the latest version (including all amendments) applies to this document.4 Use characteristics4.1 Rated voltage Rated DC voltage U0 grades should be divided into. 100kV, 160kV,.200kV, 250kV, 320kV, 400kV, 500kV. U0 can be adjusted according to engineering requirements, and the adjustment range generally does not exceed 10%, such as adjusting U0 from 500kV to 525kV. 4.2 Operating temperature The maximum temperature of cable conductors applicable to different insulating compounds is shown in Table 1. 4.3 Bending radius The minimum bending radius allowed when the cable is laid is 20 times the diameter of the cable, and the minimum bending radius allowed when the cable is running is the diameter of the cable 15 times.5 Product naming5.1 Code The relevant codes and meanings of the cables are shown in Table 2. 5.3 Specifications The specification of the cable is indicated by the rated voltage, the number of conductor cores, the nominal cross-sectional area of the conductor/the nominal cross-sectional area of the copper wire shield (if any). The nominal cross-sectional area (mm2) of the cable conductor is. 95, 120, 150, 185, 240, 300, 400, 500, 630, 800, 1000, 1200, (1400), 1600, (1800),.2000, 2500, 3000, 3500, where the maximum cross-sectional area of the aluminum conductor should be 630mm2, the cross-sectional area in brackets Areas are non-preferred cross-sectional areas. Conductors with other cross-sectional areas can be used upon request by the user. 5.4 Product Representation Method The product is indicated by model, specification and standard number of this part.6 Technical Requirements6.1 Conductors The conductor should be the second type of copper conductor or aluminum conductor in accordance with GB/T 3956, and the single wire can be a round single wire or a prefabricated single wire. Wakado The water-blocking structure should be selected for the body, and water-blocking materials should be added when the conductors are twisted. Conductors shall not be soldered throughout the core, and there shall be no broken single wires. Single line can be welded, but in the same layer, the distance between two adjacent joints Should not be less than 300mm. The surface of the conductor should be smooth, free of oil, burrs, sharp edges and raised single wires that damage the shielding and insulation of the conductor. The DC resistance of the conductor should meet the requirements of GB/T 3956 for the second type of conductor, and the temperature of 3000mm2 and 3500mm2 copper conductors should be 20℃ The DC resistance of conductors should not be greater than 0.0060Ω/km and 0.0051Ω/km respectively. 6.2 Conductor shielding Conductor shielding can be composed of semi-conductive tape and extruded semi-conductive layer, and the extruded semi-conductive layer of cables with voltage levels below 320kV The minimum thickness should not be less than 0.8mm, and the minimum thickness of the extruded semi-conductive layer for cables with a voltage level of 320kV and above should not be less than 1.2mm. The semiconductive layer should be firmly bonded to the insulation. The interface between the semiconducting layer and the insulating layer should be continuous and smooth, without obvious ridges, sharp corners, particles, and burnt edges. Burns and abrasions. Conductor shielding resistivity shall comply with the provisions in 6.4.8 of GB/T 31489.1-2015. The microhole and protrusion test at the interface between the conductor shield and the insulating layer shall comply with the provisions in 6.3.4 of GB/T 31489.1-2015. For the performance of conductive shielding materials, refer to semi-conductive shielding materials in Appendix A. 6.3 Insulation 6.3.1 Materials The insulation material should be cross-linked polyethylene material for DC cables, which can be divided into DC-XLPE-70 and DC-XLPE-90 according to the working temperature. insulating material See Appendix A for performance. 6.3.2 Thickness The nominal thickness of the insulation is shown in Table 5.The manufacturer can also design and give the nominal value of the insulation thickness. The minimum insulation thickness shall comply with the formula (1), and the eccentricity of the DC cable insulation of 320kV and below shall comply with the formula (2). The eccentricity of the DC cable insulation above 320kV should comply with the formula (3). 6.3.3 Performance The mechanical and physical properties of the finished cable insulation shall comply with the provisions in 6.3.2 of GB/T 31489.1-2015. The insulation microporous impurity test shall comply with the provisions in 6.3.4 of GB/T 31489.1-2015. The relevant electrical properties of the finished cable insulation shall comply with the provisions in 6.4 of GB/T 31489.1-2015, and the insulation conductivity test shall be Tested at 30°C and the corresponding working temperature (70°C or 90°C) respectively, and shall comply with 6.4.9 of GB/T 31489.1-2015 Regulation. 6.4 Insulation shielding The insulation shielding should be an extruded semi-conductive layer, and the minimum thickness of the insulation shielding of cables with a voltage level below 320kV should not be less than 0.5mm. The minimum thickness of the insulation shielding of cables with a voltage level of 320kV and above shall not be less than 1.0mm. The semiconductive layer should be firmly bonded to the insulating layer. The interface between the semiconducting layer and the insulating layer should be continuous and smooth, without obvious sharp corners, particles, and scorching. and scratch marks. The insulation shielding resistivity shall comply with the provisions in 6.4.8 of GB/T 31489.1-2015. The microhole and protrusion test at the interface between the insulating shield and the insulating layer shall comply with the provisions in 6.3.4 of GB/T 31489.1-2015. The properties of insulating shielding materials refer to semi-conductive shielding materials in Appendix A. 6.5 Buffer layer There should be a buffer layer outside the insulating shielding layer, and the buffer layer should be semi-conductive, so that the insulating semi-conductive shielding layer and the metal shielding layer are kept electrically connected. Good contact. The thickness of the buffer layer should be able to meet the requirement of compensating the thermal expansion of the cable during operation. When the cable has longitudinal water-blocking requirements, the buffer layer should be wrapped by (or include) a semi-conductive resistance water-swellable tape, and the water-blocking material should be suitable for the cable operating temperature and is compatible with other materials adjacent to it. When a metal-plastic composite sheath bonded directly to the insulating semi-conductive shield is used, the additional buffer layer can be eliminated. The volume resistivity of the semi-conductive buffer tape used for wrapping should be compatible with the volume resistivity of the insulation shield of the cable extrusion, other physical forces The chemical properties should meet the requirements of JB/T 10259. 6.6 Metal shielding 6.6.1 General requirements Metal shielding can adopt copper wire shielding or metal sheath shielding structure, and the cross-sectional area of metal shielding should meet the requirements of cable short-circuit capacity. If applicable, the measured resistance value of copper wire shielding shall comply with the provisions of GB/T 3956, or shall not be greater than the declared value of the manufacturer (when the nominal value of the copper wire When the cross-sectional area is different from the value specified in GB/T 3956). When required by the user, the resistance value of the metal sleeve should also be measured. The metal-plastic composite sheath shall meet the requirements in 6.3.9 of GB/T 31489.1-2015. 6.6.2 Copper wire shielding Copper wire shielding shall be composed of soft copper wires wound concentrically and loosely. The average gap G of the wire should not be greater than 4mm. G is defined by formula (4). 6.6.3 Metal sheath shielding When the cable uses a metal sheath, the metal sheath can be used as a metal shield. When the thickness of the metal sleeve cannot meet the requirements of the short-circuit capacity, the Use measures to increase the thickness of the metal sheath or increase copper wire shielding inside. 6.7 Metal sleeve 6.7.1 General requirements Lead sleeves shall be made of lead alloy. Lead alloy materials that meet the requirements of GB/T 26011 can be selected, or equivalent or better performance can also be used lead alloy material. The corrugated aluminum sleeve shall be made of aluminum or aluminum alloy, and the purity shall not be less than 99.50%. Aluminum strips for welding shall comply with GB/T 3880.1-2012 Requirements, elongation should not be less than 16%. Copper sleeves or flat aluminum sleeves can also be used if required by the user. The code of the copper sleeve shall comply with the provisions of JB/T 5268.1-2011, and the thickness measurement shall refer to Method for measuring the thickness of corrugated aluminum sleeves. 6.7.2 Thickness The nominal thickness of the metal sleeve is shown in Table 6, and the manufacturer can also design and give the nominal value of the thickness of the metal sleeve. 6.7.3 Corrosion protection layer When necessary, asphalt, asphalt paint or hot melt adhesive can be used as the anti-corrosion layer on the surface of the metal sleeve, and the asphalt can be used in accordance with GB/T 494-2010 No. 10 asphalt required. 6.8 Outer sheath 6.8.1 Materials Outer sheath types are as follows. --- ST2 based on polyvinyl chloride; --- ST7 based on polyethylene; ---Low-smoke and halogen-free (limited to tunnels and indoors, under consideration). The choice of outer sheath type depends on the design of the cable and the limited requirements of mechanical, thermal and flame retardant properties during operation. outer sheath The color is generally black. In order to adapt to certain special conditions of use, other colors can also be used after negotiation between the supplier and the buyer. Determine the carbon black content of the outer sheath compound. 6.8.2 Thickness The nominal thickness of the outer sheath is shown in Table 7, and the minimum thickness of the outer sheath should not be less than 80% of the nominal value minus 0.2mm. 6.8.4 Semiconducting layer The surface of the outer sheath should be applied with a uniform and firm semi-conductive layer. If an extruded semi-conductive layer is used and it is firmly bonded to the outer sheath of the cable solid, its thickness may constitute a part of the total thickness of the outer sheath, but the extruded semi-conductive layer shall not exceed 20% of the nominal thickness of the outer sheath. Semiconductor Please refer to Appendix A for the performance of the electric layer material. 6.9 Finished cables Finished cables shall comply with the provisions of Chapter 8. The peak value of the superimposed impulse voltage test of the cable is shown in Table 8.7 Finished cable marksThe surface of the outer sheath of the finished cable should have the name of the manufacturer, the continuous mark of the product model and product specification and the length mark. Logo should be word The trace is clear, easy to identify, and resistant to abrasion. Finished cable marks shall comply with the provisions of GB/T 6995.3.9 Acceptance rulesCables shall be subjected to development test, routine test, sampling test, type test and (or) pre-qualification test according to the test methods specified in Chapter 8 And should meet the test requirements. The frequency of sampling test and retest requirements shall be in accordance with the provisions of 9.1.2 and 9.1.3 in GB/T 31489.1-2015 Certainly. If some non-electrical performance indicators of the cable insulation are inconsistent with GB/T 31489.1-2015, they should be agreed upon by both parties, and indicated in the corresponding test report. For the same cable structure, if the rated voltage in 4.1 is adjusted, all electrical tests shall be The corresponding test is carried out based on the higher voltage after adjustment, and the test report obtained is also valid for the lower rated voltage before adjustment. For cables with a voltage level below 100kV, with the agreement of both the supplier and the purchaser, you can also refer to this section for corresponding tests. The type test and pre-qualification test shall be tested by an independent testing organization or manufacturer according to Chapter 8 and shall meet the requirements. Products should be inspected by the quality inspection department of the manufacturer before leaving the factory. When requested by the purchaser, the manufacturer shall provide relevant test results of the product. inspection report. The factory acceptance of the product should be carried out according to the test items specified in Table 10 and Table 11 and should meet the test requirements. 10 Packaging, transport and storage 10.1 Packaging The cables shall be delivered on cable reels conforming to JB/T 8137 (all parts). degree of bending. The two ends of the cable should have reliable waterproof or moisture-proof seals, and be firmly fixed on the cable drum. The product inspection certificate should be attached to each factory cable, and the product inspection certificate should be placed in an impermeable plastic bag and fixed on the side panels of the cable drum. Each cable reel shall be marked with. a) the name of the manufacturer; b) cable type and specification; c) length of the tray, m; d) Gross weight, kg; e) Package size of the cable reel (length×width×height), m; f) Factory number of the cable reel; g) date of manufacture, month and year; h) an arrow indicating the correct rolling direction for the handling of the cable drum; i) The part number. 10.2 Transport and storage Cables should avoid storage in the open air. Cable reels should not lie flat. During transportation, the cable reel with cables should not be dropped from a high place, and the cables should not be mechanically damaged. When hoisting packages, several trays should not be lifted at the same time Hoisting. On vehicles, ships and other means of transportation, the cable reel should be placed stably and fixed with a suitable method to prevent mutual collision, rolling or overturned. 11 Test after installation The electrical test after laying and installation of the cable system shall comply with the provisions in Chapter 10 of GB/T 31489.1-2015. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 31489.2-2020_English be delivered?Answer: Upon your order, we will start to translate GB/T 31489.2-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 31489.2-2020_English with my colleagues?Answer: Yes. 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