GB/T 31489.3-2020 English PDF

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GB/T 31489.3-2020: D. C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 3: D. C. submarine cables
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 31489.3-2020	369	Add to Cart	4 days	D. C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 3: D. C. submarine cables	Valid

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Basic data

Standard ID: GB/T 31489.3-2020 (GB/T31489.3-2020)
Description (Translated English): D. C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 3: D. C. submarine cables
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K13
Classification of International Standard: 29.060.20
Word Count Estimation: 20,266
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 2951.21-2008; GB/T 2951.31-2008; GB/T 2951.32-2008; GB/T 3048.4; GB/T 3048.8; GB/T 3048.11; GB/T 3048.12; GB/T 3048.13; GB/T 3048.14; GB/T 3082; GB/T 3280; GB/T 3956; GB/T 4909.3
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, finished cable markings, tests, acceptance rules, shipping, storage and transportation, and tests after installation of cross-linked polyethylene insulated submarine cables for DC transmission with a rated voltage of 500 kV and below. This standard applies to cross-linked polyethylene insulated DC submarine cables with a rated voltage of 500 kV and below used under submarine laying and operating conditions. For underwater cables laid in rivers and lakes, the implementation can also be referred to.

GB/T 31489.3-2020: D. C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 3: D. C. submarine 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 DC transmission with rated voltage of 500kV and below Insulated power cable system with extrusion Part 3.DC submarine cables State Administration for Market Regulation Released by the National Standardization Management Committee

1 Scope

This part of GB/T 31489 specifies the use of cross-linked polyethylene insulated submarine cables for direct current transmission with a rated voltage of 500kV and below. Features, product names, technical requirements, finished cable marks, tests, acceptance rules, shipping and storage, and post-installation tests. This part applies to cross-linked polyethylene insulated direct current subsea equipment with a rated voltage of 500kV and below for laying and operating conditions on the seabed. cable. For underwater cables laid in rivers and lakes, it can also be implemented by reference.

2 Normative references

The 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 characteristics

4.1 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.

5 Product naming

5.1 Code The relevant codes and meanings of submarine cables are shown in Table 2. 5.2 Model Common types and names of submarine cables are shown in Table 3 and Table 4. 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), and the optical fiber unit (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.Cross-sectional areas in brackets are non-preferred cross-sectional areas. When requested by the user, the Use conductors of other cross-sectional areas. 5.4 Product Representation Method The product is indicated by the model number, specification and standard number of this part.

6 Technical Requirements

6.1 Conductors The conductor should be the second type of copper conductor in accordance with GB/T 3956, and the single wire can be a round single wire or a prefabricated single wire. Conductors should adopt water-blocking structure. 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 insulating layer. The interface between the semiconducting layer and the insulating layer should be continuous and smooth, without obvious ridges, sharp corners, particles, Scorch and scratch marks. 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 Longitudinal water-blocking buffer layer There should be a longitudinal water-blocking buffer layer outside the insulating shielding layer, and the longitudinal water-blocking buffer layer should be wrapped with a semi-conductive resistance water-expandable tape. semiconducting The water-blocking expansion belt should be tightly wrapped, smooth and wrinkle-free. The longitudinal water-blocking buffer layer should keep the insulating shielding layer and the metal shielding layer in good electrical contact, and have a certain buffering effect. It should be able to meet the requirements of compensating for the thermal expansion of the cable during operation. 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 sleeve 6.6.1 General requirements Submarine cables shall use metal sheaths as radial water blocking layers. The metal sheath shall be a continuous extruded seamless lead sheath. The metal sleeve acts as a metal shield. When the thickness of the metal sleeve cannot meet the requirements of the short-circuit capacity, increasing the thickness of the metal sleeve or Measures to increase copper wire shielding inside. Lead sleeves shall be made of lead alloy. Lead alloy materials that meet the requirements of GB/T 26011 can be selected, or the performance is equivalent or better. lead alloy material. If the supply and demand sides reach a consensus, other materials other than lead can also be used as the metal sleeve or metal shield. 6.6.2 Thickness The nominal thickness of the lead sleeve is shown in Table 6, and the manufacturer can also design and give the nominal value of the thickness of the metal sleeve. The minimum thickness of the lead sleeve shall not be less than 95% of the nominal thickness minus 0.1mm. 6.6.3 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. 6.7 Non-metallic sheath 6.7.1 Materials An extruded non-metallic sheath should be used as a protective layer outside the metal sheath. The non-metallic sheath can be used in accordance with GB/T 31489.1-2015 Specified ST7-type materials, or semi-conductive sheathing materials based on polyethylene, see Appendix B for their properties. When necessary, a metal tape can be wrapped around the non-metallic sheath as an anti-moth layer. 6.7.2 Thickness See Table 7 for the nominal thickness of insulating non-metallic sheaths. The nominal thickness of the semi-conductive sheath can be appropriately reduced, preferably the nominal thickness specified in Table 7 minus 1.0mm, or it can be negotiated by the supplier and the purchaser. supplier to confirm. 6.7.3 Performance The mechanical and physical properties of the insulating sheath (ST7) of the finished cable shall comply with the provisions in 6.3.3 of GB/T 31489.1-2015. The resistivity of the semi-conductive sheath of the finished cable should not exceed 1000Ω·m at (80±2)°C. 6.8 Lining There should be an inner lining layer under the metal armor layer. The inner lining can be wrapped with polypropylene rope. The approximate value of the inner lining layer thickness should not be less than 1.5mm. The optical fiber unit of the optical fiber composite submarine cable can be placed in the inner liner. Other suitable materials and methods can be used in the lining layer to make the optical fiber single The element is not damaged during the manufacturing, laying and installation process. 6.9 Metal armor layer Metal wire armor is to be made of galvanized steel wire or other metal materials proven to be resistant to seawater corrosion. Galvanized steel wire shall comply with GB/T 3082 Provisions. The surface of the steel wire shall be evenly covered with asphalt or other suitable anti-corrosion material. The nominal value of the diameter of the round steel wire is generally 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, and the diameter of the steel wire does not include the Can have non-metallic corrosion protection layer. Steel wires with other diameters can be used when the supply and demand parties reach an agreement. The nominal value of flat steel wire thickness is generally 2.0mm, 2.5mm, 3.0mm. When the supply and demand sides reach an agreement, other thicknesses can be adopted. value steel wire. Flat metal wire armor should be tight. If necessary, a strip with a minimum nominal thickness of 0.3mm metal strip. The measured value of the round wire diameter shall not be lower than 95% of the nominal value, and the measured value of the flat wire thickness shall not be lower than 92% of the nominal value. 6.10 Outer coating The outer coating layer generally adopts the fiber outer coating layer, and other suitable outer coating layer structures can also be used. The approximate thickness of the outer coating is 4.0 mm. 6.11 Fiber unit 6.11.1 Materials Single-mode fiber or/and multi-mode fiber can be used according to user requirements. Single-mode fiber shall comply with the provisions of GB/T 9771 (all parts), Multimode fiber shall comply with the provisions of GB/T 12357 (all parts). The material of the loose tube should be stainless steel, and the performance of the stainless steel strip should meet the requirements of 06Cr19Ni10 in GB/T 3280. Fillers shall be made of materials that meet the requirements of YD/T 839 (all parts) or equivalent materials. The sheath can be made of medium-density or high-density polyethylene that meets the requirements of GB/T 15065, or other suitable materials as required. Material. 6.11.2 Structure 6.11.2.1 General requirements The optical fiber unit should adopt the central beam tube structure. Other structures can be adopted upon negotiation between the supplier and the purchaser. The fiber unit structure should be full cross-section Water-blocking structure, all gaps inside the sheath of the optical fiber unit should be filled with composites or other effective water-blocking measures. 6.11.2.2 Optical fiber The number of optical fibers in each loose tube should be 2 to 24 cores, and the number of optical fibers can be increased as required. For easy identification, each optical fiber coating The surface should be colored and marked according to the color code specified in GB/T 6995.2.For fibers with more than 12 cores in a single tube, color rings should be used or equivalent, for distinction. 6.11.2.3 Loose tubes and filling compounds The loose tube can adopt a single-layer stainless steel structure or a stainless steel composite structure. Loose tubes should have good mechanical properties and processing performance. Stainless steel pipes should be welded by laser, and the welding should be continuous, complete, free of welds and pores. The filler in the loose tube should be evenly distributed and easy to remove. The size of the loose tube should specify the outer diameter and wall thickness of the tube. The nominal size of the outer diameter and wall thickness of the loose tube can vary with the number of optical fiber cores in the tube. But it should be the same in the same fiber unit. The excess length of the optical fiber in the loose tube should be uniform and stable. 6.11.2.4 Reinforcements According to the requirements of the cable structure, a single or double layer of metal wire armor can be added as a reinforcement, and non-metal wire can also be used as a reinforcement. 6.11.2.5 Sheath The sheath is extruded polyethylene. The thickness of the sheath can be determined through negotiation between the supplier and the buyer. The sheath should be free from defects such as pinholes and cracks. 6.11.3 Technical requirements 6.11.3.1 Attenuation coefficient The attenuation coefficient of the optical fiber shall comply with the relevant provisions of GB/T 9771 (all parts) and GB/T 12357 (all parts). 6.11.3.2 Dispersion The dispersion of the optical fiber shall comply with the relevant provisions of GB/T 9771 (all parts). 6.11.3.3 Water tightness Watertightness shall comply with the provisions of GB/T 18480.Under 2MPa water pressure for 336h, the length of vertical water seepage should not exceed.200m. 6.12 Finished cables Finished cables shall comply with the provisions of Chapter 8. See Table 8 for the peak value of the superimposed impulse voltage of the cable.

7 Finished cable marks

Use the logo tape or the way of printing on the non-metallic sheath as the logo. The mark should be a continuous mark, and the content should include the name of the manufacturer, product type number, product specification and year of manufacture. There should be obvious length marks on the surface of the outer layer of the finished cable, and there should be a continuous length mark every 50m 1000m away from both ends. The remaining cables shall have continuous length marks every 100m. There should be eye-catching permanent signs at the joints of the factory, and the signs should comply with the provisions of GB/T 6995.2.

8 Cable test

8.1 Test category and code 8.2 Test items and requirements 8.2.1 Development test When the manufacturer does not adopt the nominal insulation thickness in Table 5, a development test shall be carried out, and the items of the development test shall be determined by the manufacturer itself. The inspection items may include but not limited to the contents stipulated in Chapter 5 of GB/T 31489.1-2015. 8.2.2 Routine tests 8.2.3 Sampling test 8.2.4 Type test The cable shall be type tested as part of the cable system. See Table 12 for the items, requirements and methods of the type test.

9 Acceptance rules

Cables 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 requirements. 10 Shipping and storage Large-length cables should be transported by ship, and the diameter of the inner circle of the cable cabin should be larger than the allowable minimum bending diameter of the cable. Reduce the torsion force on the cable, so as not to damage the cable due to torsion, and at the same time avoid damage to the cable due to excessive pressure in the radial direction of the cable. hurt. Shorter cables can be transported on special cable lifting pallets. Both ends of the cable should have reliable waterproof sealing treatment. There should be no mechanical damage during transportation damage the cable. There should be an identification plate with the cable to indicate. a) the name of the manufacturer; b) cable type and specification; c) Length, m; d) Gross weight, kg; e) date of manufacture, month and year; f) Number of this part. 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. ......

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