GB/T 29631-2025 PDF English

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GB/T 29631-2025: Flexible and torsion resistant cables of rated voltages up to and including 1.8/3 kV for wind turbine
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GB/T 29631: Evolution and historical versions

Standard ID	USD	BUY PDF	Delivery	Standard Title (Description)	Status
GB/T 29631-2025	650	Add to Cart	Auto, 9 seconds.	Flexible and torsion resistant cables of rated voltages up to and including 1.8/3 kV for wind turbine	Valid
GB/T 29631-2013	160	Add to Cart	Auto, 9 seconds.	Flexible and torsion resistant cables of rated voltages up to and including 1.8/3 kV for wind turbine	Valid

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GB/T 29631-2025: Flexible and torsion resistant cables of rated voltages up to and including 1.8/3 kV for wind turbine

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.060.20 CCS K 13 Replacing GB/T 29631-2013 Flexible and torsion resistant cables of rated voltages up to and including 1.8/3 kV for wind turbine Issued on. FEBRUARY 28, 2025 Implemented on. SEPTEMBER 01, 2025 Issued by. Status Administration for Market Regulation; National Standardization Administration.

Foreword... 3 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 8 4 Usage characteristics... 9 5 Code, model, specification, product representation method... 11 6 Technical requirements... 14 7 Finished cable test... 23 8 Inspection rules... 30 9 Delivery length... 31 10 Cable packaging, transportation, storage... 31 Appendix A (Normative) Performance requirements for cable insulation and sheath materials... 33 Appendix B (Normative) Assumed calculation method for determining sheath size. 36 Appendix C (Normative) Torsion test... 39 Appendix D (Normative) Load test... 42 Appendix E (Normative) Low-temperature bending test... 43 Appendix F (Normative) Artificial weathering test... 44 Appendix G (Normative) Salt spray test... 47

1 Scope

This document specifies the product code, marking, technical requirements, inspection rules, test methods, packaging of flexible and torsion resistant cables of rated voltages up to and including 1.8/3 kV for wind turbine for use at the connection between turbines and towers in wind power generation equipment or similar occasions. This document is applicable to flexible and torsion resistant cables of rated voltages U0/U up to and including 1.8/3 kV for wind turbine.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in the text. Among them, for dated references, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document. GB/T 2423.17 Environmental testing - Part 2.Test methods - Test Ka. Salt mist GB/T 2423.18 Environmental testing - Part 2.Test methods - Test Kb. Salt mist, cyclic (sodium chloride solution) GB/T 2900.10 Electrotechnical terminology - Electric cables GB/T 3048.4 Test methods for electrical properties of electric cables and wires - Part 4.Test of DC resistance of conductors GB/T 3048.5 Test methods for electrical properties of electric cables and wires - Part 5.Test of insulation resistance GB/T 3048.8 Test methods for electrical properties of electric cables and wires - Part 8.AC Voltage test GB/T 3048.9 Test methods for electrical properties of electric cables and wires - Part 9.Spark test of insulated cores GB/T 3048.13 Test methods for electrical properties of electric cables and wires - Part 13.Impulse voltage test GB/T 3956 Conductors of insulated cables GB/T 4909.2 Test methods for bare wires - Part 2.Measurement of dimensions GB/T 6995.1 Markings for electric wires and cables - Part 1.General requirements

3 Terms and definitions

The terms and definitions defined in GB/T 2900.10, as well as the following terms and definitions, apply to this document. 3.1 Rated voltage The reference voltage for cable design, use, electrical performance testing. 3.2 Batch Products of the same model and specification ordered at one time. 3.3 Routine tests Tests performed by the manufacturer on all manufactured lengths of finished cables, to verify whether all cables meet the specified requirements. 3.4 Sample tests Tests performed by the manufacturer on finished cable samples or on certain parts taken from finished cables at a specified frequency, to verify whether the cables meet the specified requirements. 3.5 Type tests Tests performed on a type of cable included in this document before delivery according to general commercial principles, to prove that the cable has satisfactory performance that can meet the expected conditions of use.

4 Usage characteristics

4.1 Rated voltage The rated voltage U0/U of the cable in this document is marked as. 450/750 V, 0.6/1 kV, 1.8/3 kV. The maximum temperature of conductor during normal operation of cable is. 4.3 Minimum bending radius The minimum bending radius of the cable is 6 times the cable diameter. 4.4 Ambient temperature The ambient temperature that the cable is suitable for is. 4.5 Insulating mixture The maximum conductor temperature of various insulating mixture cables is shown in Table 1. 4.6 Sheath mixture The maximum conductor temperature of cables with different types of sheath mixtures is shown in Table 2.

5 Code, model, specification, product representation method

5.1 Code See Table 3 for product code. 5.2 Common cable models and names See Table 4 for common cable models and names. 5.3 Common cable specifications See Table 5 for common cable specifications. 5.4 Product representation method Products are represented by model, specification and this document number. Specifications include rated voltage, number of cores, conductor nominal cross- sectional area.

6 Technical requirements

6.1 Conductor The conductor shall be the 5-th type of conductor in GB/T 3956.The conductor material shall be annealed soft copper wire; the copper single wire can be untinned or tinned. The conductor surface can be wrapped with non-hygroscopic tape for repeated overlapping or longitudinal wrapping. 6.2 Insulation 6.2.1 Material The insulation shall be one of the extruded insulation mixtures listed in Table 1.The mechanical and physical properties of the insulation shall comply with the provisions of Appendix A. 6.2.2 Thickness The nominal thickness of the insulation is shown in Table 6. 6.2.4 Spark test The insulated wire core shall be subjected to the power frequency spark test specified in Table 7, as an intermediate inspection, in accordance with the provisions of GB/T 3048.9.For single-core cables with sheath and insulation extruded at one time, spark test is not required. 6.2.5 Identification of 5-core and below insulated cores 6.2.6 Identification of insulated cores with more than 5 cores 6.4 Metal shielding The metal shielding is composed of soft round copper wire or tinned round copper wire. In order to improve the torsion resistance, high mechanical strength non-metallic wire can be added to the braided layer. The nominal diameter of the soft copper round wire or tinned round copper wire for braiding is shown in Table 8. 6.5 Sheath 6.6 Cable outer diameter The upper and lower limits of the average outer diameter of the finished cable are shown in Table 9. 6.7 Finished cable marking The surface of the sheath of the finished cable shall have a continuous mark of the manufacturer's name, product model and specification. The mark shall be clear, legible, resistant to abrasion. The distance between the end of a complete mark on the sheath surface and the beginning of the next mark shall not exceed 500 mm.

7 Finished cable test

7.1 Test conditions 7.1.1 Ambient temperature 7.2 Structural dimension inspection 7.2.1 Conductor inspection The conductor structure shall be inspected by inspection or feasible measurement methods; the conductor structure shall comply with the provisions of GB/T 3956. 7.2.2 Measurement of insulation and sheath thickness 7.3 Conductor DC resistance measurement The finished cable or the specimen removed from the finished cable shall be stored in a laboratory maintained at an appropriate temperature for at least 12 hours before testing. If there is doubt whether the conductor temperature is consistent with the room temperature, the cable shall be stored in the laboratory for 24 hours before measurement. The conductor specimen can also be placed in a temperature-controlled liquid tank; the resistance can be measured after at least 1 hour. 7.4 Insulation resistance measurement When measuring insulation resistance, the DC test voltage shall be 80 V ~ 500 V and applied for a long enough time, to achieve a reasonably stable measurement; however, it shall not be less than 1 min and shall not exceed 5 min. 7.5 Finished cable voltage test The voltage test shall be carried out at ambient temperature using power frequency AC voltage; the voltage shall be gradually increased to the specified value. 7.6 Insulated core voltage test The insulated core of the finished cable, which has a rated voltage of 450/750 V, shall be subjected to voltage test. The specimen length is 10 m ~ 15 m. For single-core cables with sheath and insulation extruded at one time, if the sheath and insulation cannot be separated, the sheath does not need to be removed during the test. 7.7 4 h voltage test The insulated core of the finished cable with rated voltage of 0.6/1 kV and 1.8/3 kV shall be subjected to a 4h voltage test. The specimen length is 10 m ~ 15 m. For single- core cables with sheath and insulation extruded at one time, if the sheath and insulation cannot be separated, the sheath does not need to be removed during the test. 7.8 Impulse voltage test The finished cable with rated voltage of 1.8/3 kV shall be subjected to an impulse voltage test. The specimen length is 10 m ~ 15 m. 7.9 Mechanical property test before and after insulation aging Sampling and preparation of test pieces shall be carried out in accordance with the provisions of IEC 60811-501.Aging treatment shall be carried out in accordance with the provisions of IEC 60811-401 under the conditions specified in Table A.1. 7.10 Mechanical property test before and after sheath aging Sampling and preparation of test pieces shall be carried out in accordance with the provisions of IEC 60811-501.Aging treatment shall be carried out in accordance with the provisions of IEC 60811-401 under the conditions specified in Table A.2. 7.11 High temperature pressure test of the sheath High temperature pressure test shall be conducted in accordance with the provisions of IEC 60811-508.The test temperature shall be in accordance with the provisions of Table A.2.The test results shall comply with the provisions of Table A.2. 7.14 Insulation ozone resistance test Sampling and testing shall be carried out in accordance with the provisions of IEC 60811-403.The ozone concentration and test duration shall be in accordance with the provisions of Table A.1.The test results shall comply with the provisions of Table A.1. 7.15 Thermal extension test of insulation and sheath Sampling and testing shall be carried out in accordance with the provisions of IEC 60811-507.The test conditions shall be in accordance with the provisions of Table A.1 and Table A.2.The test results of insulation shall comply with the provisions of Table A.1; the test results of sheath shall comply with the provisions of Table A.2. 7.16 Sheath oil immersion test Sampling and testing shall be carried out in accordance with the provisions of IEC 60811-404.The test conditions shall be in accordance with the provisions of Table A.2. The test results shall comply with the provisions of Table A.2. 7.17 Tear resistance test of insulation and sheath Sampling and testing shall be carried out in accordance with the provisions of JB/T 10696.7.The test results of insulation shall comply with the provisions of Table A.1; the test results of sheath shall comply with the provisions of Table A.2. 7.18 Torsion test The finished cable shall be subjected to normal temperature torsion test and low temperature torsion test; the test methods and requirements shall comply with the provisions of Appendix C. 7.19 Load test The finished cable shall be subjected to load test; the test methods and requirements shall comply with the provisions of Appendix D. 7.20 Low temperature bending test The finished cable shall be subjected to low temperature bending test; the test methods and requirements shall comply with the provisions of Appendix E.

8 Inspection rules

8.1 Products shall be inspected and qualified by the quality inspection department of the manufacturer before they can be exit-factory; each package of shipped products shall be attached with a product quality inspection certificate. 8.2 At least one sample shall be taken from each delivery batch; the number of samples may also be agreed upon by both parties. If the sampling test result is unqualified, double sampling shall be conducted for the unqualified item for a second test. If it is still unqualified, the entire batch of products shall be tested one by one. 8.3 Product inspection items, test types, test methods shall be in accordance with the provisions of Table 12.

9 Delivery length

9.1 Delivery is based on the agreed length between the two parties; the cable length measurement error shall not exceed ±0.5%. 9.2 Short sections of cable with a mass not exceeding 80 kg can be packaged in coils. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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