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GB/T 12706.3-2020 English PDF (GB/T 12706.3-2008, GB/T 12706.3-2002)

GB/T 12706.3-2020_English: PDF (GB/T12706.3-2020)
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GB/T 12706.3-2020English585 Add to Cart 0--9 seconds. Auto-delivery 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) Valid GB/T 12706.3-2020
GB/T 12706.3-2008EnglishRFQ ASK 7 days [Need to translate] Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV) -- Part 3: Cables for rated voltage of 35kV (Um=40.5kV) Obsolete GB/T 12706.3-2008
GB/T 12706.3-2002EnglishRFQ ASK 9 days [Need to translate] Rated voltage of 1 kV (Um = 1. 2 kV) to 35kV (Um = 40. 5kV) extruded insulated power cables and accessories -- Part 3: rated voltage of 35kV (Um = 40. 5kV) cable Obsolete GB/T 12706.3-2002
GB 12706.3-1991English279 Add to Cart 3 days [Need to translate] Copper or aluminium conductor extruded plastic insulated power cables with rated voltages up to 35kV--Part 3: Cross-linked polyethylene insulated power cables Obsolete GB 12706.3-1991


BASIC DATA
Standard ID GB/T 12706.3-2020 (GB/T12706.3-2020)
Description (Translated English) 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)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K13
Classification of International Standard 29.060.20
Word Count Estimation 55,542
Date of Issue 2020-03-31
Date of Implementation 2020-10-01
Drafting Organization Shanghai Cable Research Institute Co., Ltd., Shanghai National Cable Testing Center Co., Ltd., Zhongtian Technology Submarine Cable Co., Ltd., Far East Cable Co., Ltd., Yangzhou Shuguang Cable Co., Ltd., Jiangsu Shangshang Cable Group Co., Ltd., Baosheng Technology Innovation Co., Ltd. , Jiangsu Hengtong Power Cable Co., Ltd., Zhejiang Wanma Co., Ltd., Qingdao Han Cable Co., Ltd., China Electric Power Research Institute, Hangzhou Cable Co., Ltd., Wuxi Jiangnan Cable Co., Ltd., Jinbei Electric Co., Ltd., Guangzhou Nanyang Cable Co., Ltd. Company, Shanghai Huapu Cable Co., Ltd., Ningbo Ball Crown Cable Co., Ltd., Kunming Cable Group Co., Ltd., Hangzhou Huaxin Power Cable Co., Ltd., Shanghai Feihang Wire and Cable Co., Ltd., Fujian Nanping Sun Cable Co., Ltd., Zhengzhou Huaxin force
Administrative Organization National Standardization Technical Committee of Wire and Cable (SAC/TC 213)
Proposing organization China Electrical Equipment Industry Association
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration

BASIC DATA
Standard ID GB/T 12706.3-2008 (GB/T12706.3-2008)
Description (Translated English) Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV). Part 3: Cables for rated voltage of 35kV (Um=40.5kV)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K13
Classification of International Standard 29.060.20
Word Count Estimation 46,467
Date of Issue 2008-12-31
Date of Implementation 2009-11-01
Older Standard (superseded by this standard) GB/T 12706.3-2002
Quoted Standard GB/T 156-2007; 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 3048.10-2007; GB/T 3048.12-2007; GB/T 3048.13-2007; GB/T 3956-2008; GB/T 6995.3-2008; GB/T 11091-2005; GB/T 16927.1-1997; GB/T 12706.2-2008; GB/T 18380.12-2008; JB/T 8137-1999; JB/T 8996-1999; JB/T 10181.1-2000; JB/T 10181.2-2000; JB/T 10181.3-2000; JB/T 10181.4-2000; JB/T 10181.5-2000; JB/T 10181.6-2000; JB/T 10696.6-2007; YB/T 024-2008; ISO 48-2007; IEC 60229-2007; IEC 61443-1999
Adopted Standard IEC 60502-2-2005, NEQ
Drafting Organization Shanghai Electric Cable Research Institute
Administrative Organization National Standardization Technical Committee of wire and cable
Regulation (derived from) Announcement of Newly Approved National Standards No. 23 of 2008 (No. 136 overall)
Proposing organization China Electrical Equipment Industry Association
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard provides for the distribution networks or industrial installations, rated voltage 35kV permanently installed power cables with extruded insulation structure, dimensions and test requirements. In determining cable applications, it is recommended to consider the possibility of radial water risks. This section includes the so-called radial watertight and waterproof structure cable (test method, see Appendix F) test. This section does not include the installation and operating conditions for special cables, eg for overhead lines, the mining industry, nuclear power plants (containment and nearby), as well as cables for underwater or ship.

BASIC DATA
Standard ID GB/T 12706.3-2002 (GB/T12706.3-2002)
Description (Translated English) Rated voltage of 1 kV (Um = 1. 2 kV) to 35kV (Um = 40. 5kV) extruded insulated power cables and accessories - Part 3: rated voltage of 35kV (Um = 40. 5kV) cable
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K13
Classification of International Standard 29.060.20
Word Count Estimation 36,314
Date of Issue 2002-10-08
Date of Implementation 2003-04-01
Older Standard (superseded by this standard) GB 12706.1-1991; GB 12706.3-1991
Quoted Standard GB 156-1993; GB 6995.3-1986; GB/T 12706.2-2002; GB/T 16927.1-1997; GB/T 18380.1-2001; GB/T 2951.1-1997; GB/T 2951.2-1997; GB/T 2951.3-1997; GB/T 2951.4-1997; GB/T 2951.5-1997; GB/T 2951.6-1997; GB/T 2951.7-1997; GB/T 2951.8-1997; GB/T 3048.12-1994; GB/T 3048.13-1992; GB/T 3956-1997; IEC 60840-1999; IEC 60885-2-1987; IEC 61443-1989; ISO 48-1994; JB/T 8137-1999; JB/T 8996-1999
Adopted Standard IEC 60502-2-1997, NEQ
Drafting Organization Shanghai Cable Research Institute
Administrative Organization National Wire and Cable Standardization Technical Committee
Regulation (derived from) Announcement of Newly Approved National Standards No. 23 of 2008 (No. 136 overall)
Proposing organization China Electrical Appliances Industry Association
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China


GB/T 12706.3-2020 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 Contents Foreword ... 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 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) 1 Scope This 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 references The 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 temperature IEC 60229:2007, Electric cables - Tests on extruded oversheaths with a special protective function IEC 61034-2, Measurement of smoke density of cables burning under defined conditions - Part 2: Test procedure and requirements ISO 48, Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD) 3 Terms and definitions For 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. 3.1.3 median value When several values obtained from the test are arranged in increasing (or decreasing) order, if the number of values is an odd number, it is the middle value; if the number of values is an even number, it is the average of the two middle values. 3.2 Terms related to testing 3.2.1 routine tests Tests carried out by the manufacturer on all manufactured lengths of finished cables to verify whether all cables comply with specified requirements. 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. Note: The characteristic of this test is that unless changes in the cable material or design or manufacturing process may change the characteristics of the cable, there is no need to redo the test after it has been done. 3.2.4 electrical tests after installation Tests conducted after installation to prove that the installed cables and accessories are intact. 4 Voltage designation and materials 4.1 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. In the voltage designation U0/U(Um) of the cable: -- U0 is the rated power frequency voltage between the conductor for which the cable is designed and earth or the metal shield; -- U is the rated power frequency voltage between the conductors for which the cable is designed; -- Um is the maximum value of the “maximum system voltage” that the equipment can use (see GB/T 156). The rated voltage of a cable for a given application shall be appropriate for the operating conditions of the system in which the cable is used. To facilitate cable selection, systems are divided into the following three categories: 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. The lining and filling shall comply with 8.2. Semi-conducting materials can also be used for the lining and filling. When the metal materials used for the phase-separated and overall metal layers are different, extruded isolation sleeves of any material complying with the provisions in 14.2 shall be used to separate them. For lead-sheathed cables, the isolation between the lead sheath and the phase-separated cladding metal layer may use a lining that complies with 8.2. If the cable does not have an overall metal layer (see Chapter 9), the lining may be omitted as long as the cable shape remains round. 9 Metal layer of single-core or three-core cable This Part includes the following types of metal layers: a) Metal shield (see Chapter 10); b) Concentric conductor (see Chapter 11); c) Lead sheath of the metal sheath (see Chapter 12); d) Metal armor (see Chapter 13). The metal layer shall consist of one or more of the above types and shall be non- magnetic when covering a single-core cable or a separate insulated core of a three-core cable. Measures can be taken to provide longitudinal water-blocking properties around the metal layer. 10 Metal shield 10.1 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. When selecting materials of metal shields, special consideration shall be given to the possibility of corrosion, which is not only for mechanical safety but also for electrical safety. The overlap and gap of metal shields shall comply with the requirements of 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 wire shield shall be determined based on the fault current capacity. 10.2.2 The copper strip shield shall consist of an overlapping layer of soft copper strip. The nominal overlap rate between overlapping copper strips is 15% of the copper strip width, and the minimum overlap rate shall not be less than 5%. Other structures can be used when required. The soft copper strip as the shielding raw material shall be selected to comply with the regulations of GB/T 11091. The nominal thickness of the copper strip is: -- single-core cable: ≥0.12 mm; -- three-core cable: ≥0.10 mm. The minimum thickness of copper strip shall not be less than 90% of the nominal value. 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. The copper wire shield shall be composed of sparsely wound soft copper wire, and the surface can be tightened with reversely wrapped copper wire or copper strip. The average gap between adjacent copper wires shall not be greater than 4 mm. See 6.5.2 in GB/T 11017.2-2014 for the definition and calculation of the average gap between adjacent copper wires. The total resistance of copper wire shield in metal shield shall comply with the requirements of GB/T 3956 when applicable. 11 Concentric conductor 11.1 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. The metal strip shall be galvanized steel strip, stainless steel strip (non-magnetic), aluminum strip or aluminum alloy strip. The steel strip shall be industrial grade hot- rolled or cold-rolled steel strip. When the armored steel wire layer is required to meet the minimum electrical conductivity, the armored layer is allowed to contain sufficient copper wire or tinned copper wire to ensure that the requirements are met. When selecting armoring materials, especially when the armor is used as a shield, special consideration shall be given to the possibility of corrosion, which is not only for mechanical safety but also for electrical safety. Unless special construction is adopted, the armor of single-core cables used in AC systems shall be of non-magnetic material. Note: Even if the single-core cable used in the AC system is armored mainly with magnetic materials and adopts a special structure, the cable carrying capacity will still be greatly reduced. 13.3 Application of armor 13.3.1 Single-core cable There shall be an extruded lining layer under the armored layer of single-core cables, and the thickness shall comply with 8.2. 13.3.2 Three-core cable When three-core cables need to be armored, the armor shall be coated on a lining that complies with 8.2. 13.3.3 Isolation sleeve When the metal layer under the armor is different from the armor material, one of the materials specified in 14.2 shall be extruded and wrapped with an isolation sleeve to separate them. The isolation sleeve shall withstand the spark test specified in GB/T 3048.10. The isolation sleeve of halogen-free cable (ST8) shall comply with the requirements in Table 5. If the lead-sheathed cable requires an armor layer, isolation sleeves or tape-coated cushions can be used, which shall comply with the provisions of 13.3.4. If an isolation sleeve is used under the armor layer, it can be used instead of the lining layer or in addition to the lining layer. Cables with a longitudinal water-blocking structure around the metal layer do not need an isolation sleeve. The nominal thickness of the isolation sleeve shall be calculated according to Formula (2): Where: tss – nominal thickness of the isolation sleeve, in millimeters (mm); Du – assumed diameter before the isolation sleeve, in millimeters (mm). The assumed diameter calculation shall be carried out according to Appendix A, and the calculation result shall be rounded to 0.1 mm (see Appendix B). When the calculated value of the nominal thickness of the non-lead sheathed cable isolation sleeve is less than 1.2 mm, the nominal thickness of the isolation sleeve shall be 1.2 mm. If the isolation sleeve is directly extruded onto the lead sheath, when the calculated value of the nominal thickness of the isolation sleeve is less than 1.0 mm, the nominal thickness of the isolation sleeve shall be 1.0 mm. 13.3.4 Tape cushion under lead sheathed cable armor The tape cushion outside the lead sheath coating shall be composed of impregnated paper tape and composite paper tape, or two layers of impregnated paper tape and composite paper tape plus one or more layers of composite impregnated fiber material. The impregnating agent for the cushion material can be asphalt or other preservatives. For metal wire armor, these impregnating agents shall not be applied directly under the metal wire. Synthetic material tapes may also be used instead of impregnated paper tapes. The approximate total thickness of the tape cushion between the lead sheath and the armor after armoring is 1.5 mm. 13.4 Dimensions of armored metal wire and armored metal strip Armored metal wire and armored metal strip shall preferably be of the following nominal dimensions: -- Round metal wire (thin): diameter 2.0 mm, 2.5 mm, 3.15 mm; -- Round metal wire (thick): diameter 4.0 mm; -- Flat metal wire: thickness 0.8 mm; 15 Test conditions 15.1 Ambient temperature Unless otherwise specified, the test shall be conducted at ambient temperature (20±15) °C. 15.2 Frequency and waveform of power frequency test voltage The frequency of the power frequency test voltage shall be 49 Hz ~ 61 Hz, the waveform shall be basically a sine wave, and the quoted value shall be the effective value. 15.3 Waveform of impulse test voltage According to GB/T 3048.13, the shock wave shall have an effective wave front time of 1 μs ~ 5 μs and a nominal half-peak time of 40 μs ~ 60 μs. Other aspects shall comply with GB/T 16927.1. 15.4 Determination of cable conductor temperature The cable conductor temperature during the test can be determined according to the method specified in GB/T 12706.2. 16 Routine test 16.1 General Routine tests shall normally be carried out on each manufactured length of cable (see 3.2.1). According to the quality control agreement reached between the purchaser and the manufacturer, the number of test cables can be reduced or other test methods can be used. The routine tests specified in this Part are: a) Conductor resistance measurement (see 16.2); b) Partial discharge test (see 16.3); c) Voltage test (see 16.4); d) DC voltage withstand test of the outer sheath, when there is a semi-conductive structure on the outer sheath of the cable (see 16.5). 16.2 Conductor resistance measurement Resistance measurements shall be made on all conductors for each cable length in the routine test, including concentric conductors if there are any. Finished cables or samples removed from finished cables shall be stored in a test room maintained at an appropriate temperature for at least 12 hours before testing. If there is doubt whether the conductor temperature is consistent with room temperature, the cable shall be stored in the test room for 24 hours before measurement. Alternatively, the conductor sample can be placed in a temperature-controlled liquid tank for at least 1 hour before the resistance is measured. The measured value of resistance shall be corrected to the value of 1 km length at 20 °C according to the formula and coefficient given in GB/T 3956. The DC resistance of each conductor at 20 °C shall not exceed the corresponding maximum value specified in GB/T 3956. When the nominal cross-sectional area is applicable, the resistance of the concentric conductors shall also comply with GB/T 3956. The conductor DC resistance requirements of aluminum alloy conductors are consistent with those of aluminum conductors of the same nominal cross-sectional area. 16.3 Partial discharge test The partial discharge test shall be carried out according to GB/T 3048.12, and the test sensitivity shall be 10 pC or better. All insulated cores of a three-core cable shall be tested, with voltage applied between each conductor and the metallic shield. The test voltage shall be gradually increased to 2U0 and maintained for 10 s, and then slowly reduced to 1.73U0. At 1.73U0, there shall be no detectable discharge produced by the cable under test that exceeds the declared test sensitivity. Note: Any discharge from the cable under test may be harmful. 16.4 Voltage test 16.4.1 Overview The voltage test shall be conducted at ambient temperature using power frequency AC voltage. Unless otherwise required by the purchaser, the manufacturer may choose the following procedures for routine voltage test: a) 3.5U0, 5 min; 18 Electrical type test 18.1 General After a type of cable with a specific voltage and conductor cross-sectional area has passed the type test of this Part, the type approval for cables with other conductor cross- sections and/or rated voltages remains valid, as long as the following three conditions are met: a) The insulating and semiconducting shielding materials and manufacturing processes used are the same; b) The conductor cross-sectional area is not larger than the tested cable. However, if the conductor cross-sectional area of the tested cable is between 95 mm2 and 630 mm2 (inclusive), all cables of 630 mm2 and below are also valid; c) The rated voltage is not higher than the tested cable. Type approval is independent of conductor material. 18.2 Sample A cable test portion with a length of 10 m ~ 15 m shall be taken from the finished cable for testing according to 18.3. With the exception of 18.4, all tests listed in 18.3 shall be performed sequentially on the same test portion. Each test or measurement on three-core cables shall be made on all insulated cores. The resistivity measurement of the semi-conducting shield specified in 18.11 shall be carried out on a separate test portion. 18.3 Test sequence The normal sequence of tests shall be as follows: a) bending test and the subsequent partial discharge test (see 18.5 and 18.6); b) tanδ measurement (see 18.7); c) heat cycle test and the subsequent partial discharge test (see 18.8); d) impulse voltage test and the subsequent power frequency voltage test (see 18.9); e) 4 h voltage test (see 18.10). 18.4 Special terms ......


GB/T 12706.3-2008 Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um = 1.2kV) up to 35kV (Um = 40.5kV) Part 3. Cables for rated voltage of 35kV (Um = 40.5kV) ICS 29.060.20 K13 National Standards of People's Republic of China Replacing GB/T 12706.3-2002 Rated voltage Vp 1 k (U m1 = 1.2 k Vp) to 35 k Vp (U m1 = 40.5 k Vp) extruded insulated power cables and accessories Part 3. Rated voltage Vp 35 k (U m1 = 40.5 k Vp) cable (IEC 60502-2.2005, Powercableswithextrudedinsulationand theiraccessoriesforratedvoltagesfrom1kV (Um = 1.2kV) upto 30kV (Um = 36kV) -Part 2. Cablesforratedvoltagesfrom 6kV (Um = 7.2kV) upto30kV (Um = 36kV), NEQ) Posted 2008-12-31 2009-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released Table of Contents Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 4 voltage and marking material 3 5 conductor 4 6 Insulation 5 7 shield 5 8 core cable three-core cables, inner liner and filling 5 9 single and three-core cable metal layer 6 10 metal shield 6 11 7 concentric conductor 12 metal jacket 7 13 metal armor 7 14 outer sheath 9 15 10 Test conditions 16 Routine tests 10 17 sampling test 11 18 electrical type test 14 19 16 Non-electrical type test After the installation of electrical test 20 19 Supplementary Terms 2021 cable products Suppose the calculation method in Annex A (normative) to determine the size of the protective layer 25 Appendix B (normative) rounding off 29 Annex C (normative) semi-conductive shielding resistivity measurement method 30 Annex D (normative) permeability test 32 Appendix E (Normative Appendix) HEPR insulation hardness measuring 34 Annex F (informative) having a longitudinally metal foil composite sheath cable assemblies Test 36 Supplementary Provisions Annex G (normative) cable products 38 Foreword GB/T 12706 "rated voltage 1kV (Um = 1.2kV) to 35kV (Um = 40.5kV) extruded insulated power cables and accessories" sub Into four parts. --- Part 1. Rated voltage 1kV (Um = 1.2kV) and 3kV (Um = 3.6kV) cable; --- Part 2. Rated voltage 6kV (Um = 7.2kV) to 30kV (Um = 36kV) cable; --- Part 3. Rated voltage 35kV (Um = 40.5kV) cable; --- Part 4. rated voltage 6kV (Um = 7.2kV) to 35kV (Um = 40.5kV) cable accessories test requirements. This section GB/T Part of 312,706. This portion corresponds to IEC 60502-2.2005 "rated voltage 1kV (Um = 1.2kV) to 30kV (Um = 36kV) extruded insulation Part 2 power cables and accessories. Rated voltage 6kV (Um = 7.2kV) to 30kV (Um = 36kV) cable ", with its degree of consistency Non-equivalent, the main differences are as follows. Mountain Cable Co., Ltd., Qingdao Hanlan Co., Ltd., Yangzhou Shuguang Cable Co., Ltd., Liaoning Electric Power Co., Ltd., Far East Holding Group Co., Ltd., Jiangsu on the cable company, Wuxi Jiangnan Cable Co., Ltd., Jiang Su Shengan Cable Co., Ltd., Shanghai Nanda Group The company, Zhejiang Wanma Cable Co., Ltd. The main drafters of this section. Deng Changsheng Zhou Yan, Tang Chongjian, summoned Liu, Zhang Yanhua, Liang Guohua, Yang Changlong, Wang Chuanbin, Wangsong Ming, Liu Jun, Sun Ping, Yang Zhiqiang, Zheng. This part of the standard replaces the previous editions are. --- GB 12706.3-1991, GB/T 12706.3-2002; --- GB 12706.1-1991. Rated voltage Vp 1 k (U m1 = 1.2 k Vp) to 35 k Vp (U m1 = 40.5 k Vp) extruded insulated power cables and accessories Part 3. Rated voltage Vp 35 k (U m1 = 40.5 k Vp) cable 1 Scope This section GB/T 12706 requirements for distribution networks or industrial installations, the rated voltage of 35kV fixedly mounted with extruded insulation Structure, size and test requirements of power cables. In determining cable applications, it is recommended to consider possible risk of radial water. This section includes the so-called radial watertight and waterproof structure Cable (test method see Appendix F) test. This section does not include cable for special installation and operating conditions, such as overhead lines for the mining industry, nuclear power plants (and containment Its vicinity), and a ship or submarine cables. 2 Normative references The following documents contain provisions which, through GB/T 12706 reference in this text, constitute provisions of this part. For dated references Documents, all subsequent amendments (not including errata content) or revisions do not apply to this section. However, according to the encouragement of part Research into whether the parties to the agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 156-2007 standard voltage (IEC 60038.2002, MOD) GB/T 2951.11-2008 cable and the cable Common test methods for insulating and sheathing materials - Part 11. General test side Law --- --- Measurement of thickness and overall dimensions of mechanical tests (IEC 60811-1-1.2001, IDT) GB/T 2951.12-2008 cable and the cable Common test methods for insulating and sheathing materials - Part 12. General test side Law --- Thermal aging methods (IEC 60811-1-2. 1985, IDT) GB/T 2951.13-2008 cable and the cable Common test methods for insulating and sheathing materials - Part 13. General test side Density determination method --- --- --- Water absorption tests - Shrinkage test (IEC 60811-1-3.2001, IDT) GB/T 2951.14-2008 cable and the cable Common test methods for insulating and sheathing materials - Part 14. General test side Law --- Low temperature test (IEC 60811-1-4. 1985, IDT) GB/T 2951.21-2008 cable and the cable Common test methods for insulating and sheathing materials - Part 21. elastomeric compounds designed Test method for ozone resistance test --- --- --- Hot set test - Mineral oil immersion tests (IEC 60811-2-1.2001, IDT) GB/T 2951.31-2008 cable and the cable Common test methods for insulating and sheathing materials - Part 31. Polyvinyl chloride mixture Methods specific high temperature pressure test --- --- resistance to cracking (IEC 60811-3-1. 1985, IDT) GB/T 2951.32-2008 cable and the cable Common test methods for insulating and sheathing materials - Part 32. Polyvinyl chloride mixture Special test methods --- --- Loss of mass test - Thermal stability test (IEC 60811-3-2. 1985, IDT) GB/T 2951.41-2008 cable and the cable Common test methods for insulating and sheathing materials Part 41. polyethylene and polypropylene Mixed Methods specific environmental stress cracking resistance test --- --- --- melt index measurement method Direct measurement of combustion of carbon polyethylene Black and (or) mineral filler content --- thermal gravimetric analysis (TGA) measurements of carbon black content --- microscopy assessment of carbon black dispersion in polyethylene Degree (IEC 60811-4-1.2004, IDT) GB/T 3048.10-2007 wire and cable electrical performance test methods - Part 10. extruded sheath spark test GB/T 3048.12-2007 wire and cable electrical performance test methods - Part 12. Partial discharge tests (IEC 60885-3. ......

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