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GB/T 31489.4-2020 English PDF

GB/T 31489.4-2020_English: PDF (GB/T31489.4-2020)
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GB/T 31489.4-2020English350 Add to Cart 0--9 seconds. Auto-delivery D. C. extruded cables systems for power transmission at a rated voltage up to and including 500 kV--Part 4: Accessories for D. C. cables Valid GB/T 31489.4-2020


BASIC DATA
Standard ID GB/T 31489.4-2020 (GB/T31489.4-2020)
Description (Translated English) D. C. extruded cables systems for power transmission at a rated voltage up to and including 500 kV--Part 4: Accessories for D. C. cables
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K13
Classification of International Standard 29.060.20
Word Count Estimation 19,161
Date of Issue 2020-12-14
Date of Implementation 2021-07-01
Quoted Standard GB/T 311.1-2012; GB/T 1527; GB/T 2900.10-2013; GB/T 2951.21-2008; GB/T 3048.8; GB/T 3048.12; GB/T 3048.13; GB/T 3048.14; GB/T 4423; GB/T 4909.3; GB/T 8287.1; GB/T 11017.1-2014; GB/T 12464; GB/T 16927.1; GB/T 20878; GB/T 21429; GB/T 23752; GB/T 26218.1
Drafting Organization Shanghai National Cable Testing Center Co., Ltd.
Administrative Organization National Wire and Cable Standardization Technical Committee
Regulation (derived from) National Standard Announcement No. 28 of 2020
Proposing organization China Electrical Equipment Industry Association
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration
Summary This standard specifies the use characteristics, product naming, technical requirements, accessory markings, accessory tests, acceptance rules, packaging, transportation and storage of cross-linked polyethylene insulated power cable accessories for DC transmission with a rated voltage of 500 kV and below. This standard applies to the terminals and joints of XLPE insulated DC land cables and DC submarine cables for DC transmission with a rated voltage of 500 kV and below.


GB/T 31489.4-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.060.20 K 13 D.C. Extruded Cables Systems for Power Transmission at a Rated Voltage up to and Including 500 kV - Part 4: Accessories for D.C. Cables ISSUED ON: DECEMBER 14, 2020 IMPLEMENTED ON: JULY 1, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms, Definitions and Symbols ... 6 4 Service Characteristics ... 7 5 Product Naming ... 8 6 Technical Requirements ... 10 7 Marking of Accessories ... 15 8 Tests of Accessories ... 15 9 Acceptance Inspection Rules ... 19 10 Packaging, transportation and Storage ... 20 Appendix A (informative) Properties of Silicone Oil ... 21 Appendix B (normative) Test Requirements and Methods ... 22 Bibliography ... 24 D.C. Extruded Cables Systems for Power Transmission at a Rated Voltage up to and Including 500 kV - Part 4: Accessories for D.C. Cables 1 Scope This Part of GB/T 31489 specifies the service characteristics, product naming, technical requirements, accessories marking, accessories test, acceptance inspection rules, packaging, transportation and storage of XLPE insulated power cable accessories for power transmission at a rated voltage up to and including 500 kV. This Part is applicable to the terminations and joints of XLPE insulated DC land cables and DC submarine cables for power transmission at a rated voltage up to and including 500 kV. 2 Normative References The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 311.1-2012 Insulation Co-ordination - Part 1: Definitions, Principles and Rules GB/T 1527 Drawn Tube of Copper and Copper Alloys GB/T 2900.10-2013 Electrotechnical Terminology - Electric Cables GB/T 2951.21-2008 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables - Part 21: Methods Specific to Elastomeric Compounds - Ozone Resistance, Hot Set and Mineral Oil Immersion Tests GB/T 3048.8 Test Methods for Electrical Properties of Electric Cables and Wires - Part 8: AC Voltage Test GB/T 3048.12 Test Methods for Electrical Properties of Electric Cables and Wires - Part 12: Partial Discharge Test GB/T 3048.13 Test Methods for Electrical Properties of Electric Cables and Wires - Part 13: Impulse Voltage Test GB/T 3048.14 Test Methods for Electrical Properties of Electric Cables and Wires - Part 14: DC Voltage Test GB/T 4423 Copper and Copper Alloy Cold-drawn Rod and Bar GB/T 4909.3 Test Methods for Bare Wires - Part 3: Tensile Test GB/T 8287.1 Indoor and Outdoor Post Insulators for Systems with Nominal Voltage greater than 1,000 V - Part 1: Test on Insulators of Ceramic Material or Glass GB/T 11017.1-2014 Power Cables with Cross-linked Polyethylene Insulation and Their Accessories for Rated Voltage of 110 kV (Um = 126 kV) - Part 1: Test Methods and Requirements GB/T 12464 Wooden Boxes GB/T 16927.1 High-voltage Test Techniques - Part 1: General Definitions and Test Requirements GB/T 20878 Stainless and Heat-resisting Steels - Designation and Chemical Composition GB/T 21429 Composite Insulators - Hollow Insulators for Use in Outdoor and Indoor Electrical Equipment - Definitions, Test Methods, Acceptance Criteria and Design Recommendations GB/T 23752 Hollow Pressurized and Unpressurized Ceramic and Glass Insulators for Use in Electrical Equipment with Rated Voltages greater than 1,000 V GB/T 26218.1 Selection and Dimensioning of High-voltage Insulators Intended for Use in Polluted Conditions - Part 1: Definitions, Information and General Principles GB/T 31489.1-2015 D.C. Extruded Cable Systems for Power Transmission at a Rated Voltage up to and Including 500 kV - Part 1: Test Methods and Requirements 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 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 YD/T 814.3 Closure for Optical Fiber Cables - Part 3: Closure for Shallow Water Submarine Optical Fiber Cables YD/T 814.5 Closure for Optical Fiber Cables - Part 5: Closure for Deep Water Submarine Optical Fiber Cables IEC 60840:2020 Power Cables with Extruded Insulation and Their Accessories for Rated Voltages above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) - Test Methods and Requirements IEC 62067:2011 Power Cables with Extruded Insulation and Their Accessories for Rated Voltages above 150 kV (Um = 170 kV) up to 500 kV (Um = 550 kV) - Test Methods and The following symbols are applicable to this document. U0: the rated DC voltage between the conductor and the shield for which the cable system is designed. UP2,S: when the operating impulse voltage has the same polarity as the actual DC voltage, 1.15 times the maximum absolute peak value of the operating impulse voltage that the cable system may withstand. UP2,O: when the operating impulse voltage is opposite in polarity to the actual DC voltage, 1.15 times the maximum absolute peak value of the operating impulse voltage that the cable system may withstand. UP1: when the lightning impulse voltage is opposite in polarity to the actual DC voltage, 1.15 times the maximum absolute peak value of the lightning impulse voltage that the cable system may withstand. 4 Service Characteristics 4.1 Rated Voltage and Operating Temperature The land cable accessories shall comply with the stipulations of Chapter 4 in GB/T 31489.2- 2020; the submarine cable accessories shall comply with the stipulations of Chapter 4 in GB/T 31489.3-2020. 4.2 Environmental Conditions (applicable to outdoor termination) 4.2.1 Temperature and altitude 4.2.1.1 Normal operating conditions The normal operating conditions are as follows: a) The maximum air temperature of the surrounding environment does not exceed 40 C; b) The altitude of the installation site does not exceed 1,000 m. 4.2.1.2 Temperature correction of test voltage value For equipment where the air temperature of the surrounding environment is higher than 40 C, the test voltage of the outer insulation in a dry state shall be multiplied by the temperature correction factor Kt, as shown in Formula (1). Where, Kt---the temperature correction factor; The conductor connecting rod shall be made of copper material conforming to GB/T 4423, and shall be annealed. The conductor connecting pipe shall be made of copper material conforming to GB/T 1527. The copper content of the crimp-type conductor connecting pipe shall not be lower than 99.90%, and shall be annealed. The connecting terminals shall be made of copper or copper alloy with good electrical conductivity. See IEC/TR 62271-301 or user requirements for the dimensions. NOTE: aluminum connection fittings are under consideration. The surface of the conductor connecting rod and the conductor connecting pipe shall be smooth and clean, and there shall be no damages, burrs, concave-convex marks and other defects affecting electrical contact and mechanical strength. For cast-molded terminals, the contact surface and connection holes shall not have defects like air holes, sand holes and slag inclusions, etc. The specifications of the conductor connecting rod and the conductor connecting pipe shall be not smaller than the cross-sectional area of the cable conductor. The mechanical strength of the conductor connecting rod and the conductor connecting pipe shall satisfy the requirements of installation and operating conditions. When required, the conductor connecting rod and conductor connecting pipe may be tested as specified in 8.2.4.7, so as to demonstrate that their performance satisfies the requirements. 6.2 Structural Fittings The structural fittings of the accessories include metal shells, flanges, bushings and surrounding brackets, etc., and should be made of non-magnetic metal materials. The matching surface of the spring pressing device shall be smooth and free of protrusions, and shall be closely matched with the rubber stress cone, so as to provide the specified pressure within the design life. All sealing fittings shall have good assembly tightness and fitness, and there shall be no defects that may cause leakage after assembly, such as: scratches and dents, etc. 6.3 Sealing Rings The sealing rings for the accessories shall be compatible with the surrounding insulating medium, and can be used for a long time under a rated load. 6.4 Rubber Stress Cones and Prefabricated Rubber Insulation Pieces The properties of the insulating materials and semi-conductive materials used for the rubber stress cones and prefabricated rubber insulation pieces shall satisfy the requirements of use. The rubber stress cones and prefabricated rubber insulation pieces shall be free of air bubbles, burns and other detrimental impurities; the inner and outer surfaces shall be smooth, and without scars, cracks or protrusions. The interface between the insulation and the semi- conductive shield shall be well bonded, and without cracks or peeling; there shall be no detrimental impurities in the semi-conductive shield. The dimensions and specifications of the prefabricated rubber insulation pieces shall be adapted to the outer diameter of the main insulation of the cable. The electrical conductivity characteristics of the insulating materials used for the prefabricated rubber insulation pieces and the main insulating materials of the cables shall match. 6.5 Epoxy Prefabricated Pieces and Epoxy Bushings The epoxy prefabricated pieces and epoxy bushings shall be free of detrimental impurities and pores; the inner and outer surfaces shall be smooth and free of defects. The insulator and the embedded metal parts shall be well bonded, and without cracks, deformations or other abnormal phenomena. When applicable, the insulators used for the disconnection of metal sheath of sectionalizing joints shall be able to withstand the DC voltage test and lightning impulse voltage test in Appendix H of IEC 60840:2020 or Appendix G of IEC 62067:2011. 6.6 Porcelain Bushings and Composite Bushings Porcelain bushings and composite bushings shall be selected in accordance with the creepage distance of the outer insulation of the termination. The creepage distance of the outer insulation shall satisfy the user’s requirements. Porcelain bushings shall comply with the requirements of GB/T 23752. Composite bushings shall comply with the requirements of GB/T 21429. 6.7 Post Insulators Post insulators shall comply with the requirements of GB/T 8287.1. 6.8 Liquid Insulating Fillers Liquid insulating fillers shall be compatible with the insulating materials and structural materials that they are in contact with. For ethylene-propylene rubber stress cones, vacuum-degassed silicone oil should be adopted as the liquid insulating filler. See Appendix A for the properties of the silicone oil. If the stress cone is made of silicone rubber, then, a suitable liquid insulating filler shall be adopted. 6.9 Waterproof Pouring Agents The pouring agents shall have good waterproof and sealing performance, and no harmful effect accordance with 8.2.2.1; for molded submarine cable repair joints, the routine test cannot be carried out, instead, sampling test shall be carried out in accordance with 8.2.3, so as to control the quality level of the repair joints. 8.2.3 Sampling test The sampling test of submarine cable factory joints shall be carried out in accordance with the stipulations of 9.2 in GB/T 31489.1-2015. See the test requirements and methods in Table B.1. The sampling test of repair joints and terminations shall be carried out in accordance with the stipulations of 9.3 in GB/T 31489.1-2015. The sampling test of field molded joints shall be carried out in accordance with the stipulations of 9.4 in GB/T 31489.1-2015. 8.2.4 Type test 8.2.4.1 Overview The accessories shall be subject to the type test as part of the cable system. The test requirements and methods are shown in Table B.2. The factory joints, together with the submarine cable specimens, shall be subject to the coiling test and tension bending test specified in 6.4.3.2 in GB/T 31489.1-2015, then, the electrical type test in accordance with the stipulations of 6.4.4 ~ 6.4.6 in GB/T 31489.1-2015. The other types of joints and terminations shall be subject to the electrical type test in accordance with the stipulations of 6.4.4 ~ 6.4.6 in GB/T 31489.1-2015. The type test and requirements of the accessories shall comply with the stipulations of Chapter 6 in GB/T 31489.1-2015. In addition, the following items shall also be tested: a) Sealing test after assembly of accessories (see 8.2.4.2); b) Tensile test of conductor joints of factory joints (see 8.2.4.3); c) Insulation micropores, impurities and semi-conductive shielding layer, and insulating layer interface micropores and protrusion test of factory joints (see 8.2.4.4); d) DC voltage test for outdoor terminations exposed to rain (if applicable, see 8.2.4.5); e) The outer protective layer test for joints (if applicable, see 8.2.4.6); f) Thermomechanical properties test of conductor crimps and mechanical connections, when required (see 8.2.4.7). 8.2.4.2 Sealing test after assembly of accessories 8.2.4.2.1 Installation of specimens The termination specimen shall be assembled in accordance with the installation requirements in actual application, and the assembled specimens may not contain insulating pieces. The test device shall seal the two ends of the specimens of sealing fittings, porcelain bushings, composite bushings or epoxy bushings. In accordance with the applicable situation, one of the methods specified in 8.2.4.2.2 or 8.2.4.2.3 can be selected for the test. The accessories or bushings subject to external pressure shall be tested in accordance with the method specified in 8.2.4.2.3. 8.2.4.2.2 Pressure leakage test One of the following methods can be adopted to carry out the test: ---Method 1: at ambient temperature, apply an air pressure with a gauge pressure of (250  10) kPa to the specimen and maintain it for 1 h. The test product subject to the air pressure shall have explosion-proof safety measures. Carry out either water immersion test or soap liquid applying test on the sealing surface to observe whether there is gas escape. ---Method 2: apply the same water pressure and maintain it for 1 h. On the sealing surface, apply chalk powder and observe for signs of water seepage. During the test, there shall be no signs of air leakage or water seepage. 8.2.4.2.3 Vacuum leakage test At ambient temperature, vacuumize the specimen, until the residual pressure A is 10 kPa of air pressure, then, close the vacuum valve between the specimen and the vacuum pump and maintain for 1 h. Afterwards, measure the pressure value B of the specimen, and calculate the vacuum pressure leak gain (B  A). At the end of the test, the vacuum pressure leak gain (B  A) shall not exceed 10 kPa. 8.2.4.3 Tensile test of conductor joints of factory joints The conductor joint tensile test of factory joints shall be carried out in accordance with the stipulations of GB/T 4909.3. The test results shall comply with the requirements of 9.2.6 in GB/T 31489.1-2015. 8.2.4.4 Insulation micropores, impurities and semi-conductive shielding layer, and insulating layer interface micropores and protrusion test of factory joints The factory joints shall be subject to the insulation micropores, impurities and semi-conductive shielding layer, and insulating layer interface micropores and protrusion test in accordance with the stipulations of Appendix H in GB/T 11017.1-2014. The test results shall comply with the requirements of 6.3.4 in GB/T 31489.1-2015. 8.2.4.5 DC voltage test for outdoor terminations exposed to rain When required by the user, the DC voltage test for outdoor terminations exposed to rain shall be carried out. The outdoor terminations shall be exposed to rain, and a DC voltage of 1.85U0 shall be applied for 1 min. The rain condition shall comply with the stipulations of GB/T 16927.1, and the specimens shall not manifest any break down or flashover. 8.2.4.6 Outer protective layer test for joints The outer protective layer test for joints shall be carried out in accordance with the stipulations of 6.3.10 in GB/T 31489.1-2015. 8.2.4.7 Recommended tests for conductor primps and mechanical connections The conductor primps and mechanical connections shall be subject to electrical thermal cycle tests and mechanical tests. The test methods and requirements are under consideration. 8.2.5 Type test for systems composed by accessories and cables The type test for the cable systems including accessories shall be carried out in accordance with the stipulations of Chapter 6 in GB/T 31489.1-2015. 8.2.6 Pre-qualification test for systems composed by accessories and cables The accessories shall form a system with the corresponding cables. The pre-qualification test items shall comply with the stipulations of Chapter 7 in GB/T 31489.1-2015. See the test requirements and methods in Table B.2. 9 Acceptance Inspection Rules The manufacturer shall carry out the development test, routine test, sampling test, type test and (or) pre-qualification test in accordance with the test methods specified in Chapter 8. The frequency and requirements of the sampling test shall comply with the stipulations of 9.2, 9.3 and 9.4 in GB/T 31489.1-2015. For the same accessory structure, if the rated voltage in 4.1 is adjusted, then, all electrical tests shall be carried out on the basis of the adjusted higher voltage, and the test report obtained is also valid for the lower rated voltage before the adjustment. For accessories with a voltage level below 100 kV, with the agreement of both the supply-side and the demand-side, corresponding tests may also be carried out with reference to this Part. The type test and pre-qualification test shall be carried out by an independent testing institution or the manufacturer in accordance with the requirements of Chapter 8, and shall comply with the requirements. The product shall pass the inspection by the quality inspection department of the manufacturer before exiting the factory. Upon request of the purchaser, the manufacturer shall provide the relevant test reports of the product. ......

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