GB/T 12706.2-2020Power 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 2: Cables for rated voltages from 6 kV (Um=7.2 kV) up to 30 kV (Um=36 kV) (English PDF)

14.2 and Table 5);

--- Increased the nominal insulation thickness of the rated voltage 18/20 (24) kV cable (see Table 7 and Table 8);

--- Modify the requirements of the extruded inner liner and the wrapped inner liner (see 8.2, 8.1 in the.2008 edition);

--- Revised the regulations on the coverage rate of copper strips (see 10.2.3,.2008 version 10.2.3);

--- Modified the formula for calculating the nominal thickness of the lead sleeve (see Chapter 12, 12.1 of the.2008 edition);

--- Amended the provisions of the armor material (see 13.2, 13.2 of the.2008 edition);

--- Added the requirements for the diameter of the thick round wire and the nominal thickness of the insulating sleeve or inner liner under the armor (see 13.4, Table 10 and

13.6);

--- The thickness of the outer sheath has been modified (see 14.3, 14.3 of the.2008 edition);

--- Added the determination method of cable conductor temperature in the test (see 15.4 and Appendix C);

--- Increased the withstand voltage test of the outer sheath with semi-conductive layer (see 16.1 and 16.5);

--- Modified the thickness requirements for non-metallic sheaths (see 17.5.3 and 19.3,.2008 version 17.5.3 and 19.2);

--- Increasing the measurement of the wrapping rate of the wrapping tape and the gap rate of the metal tape (see 17.11);

--- Increasing the thickness measurement of the inner liner and/or tape cushion (see 17.12 and 19.26);

--- Amended the cylinder diameter for bending test (see 18.2.4, 18.1.3 of the.2008 edition);

--- Added the measurement requirements for the thickness of the lead sleeve (see 19.4);

--- Increasing the halogen-free flame retardant (ST8) jacket material mechanical properties, high temperature pressure, low temperature performance, combustion performance and water absorption performance test (see

19.6, 19.7, 19.9, 19.10, 19.16, 19.25, Table 21 and Table 25);

--- Modified the cable flame retardant test (see 19.16,.2008 version 19.14);

--- Modify the applicable object of carbon black content test of black polyethylene sheath (see 19.17.1,.2008 version 19.15.1);

--- Modified the electrical test requirements after cable installation (see 20.3.1,.2008 version 20.2.1);

--- Removed the heat extension test load time (see Table 15 and Table 16, the.2008 version of Table 19 and Table 23);

--- Modified the electrical test requirements for insulation (see Table 17, Table 15 of the.2008 edition);

--- Increased the rule of rounding off the specified value (see B.3);

--- Increased the polyolefin outer sheath code (see G.1.1);

--- Added the product representation method of flame retardant cables (see G.1.3);

--- Increased delivery length and marking requirements for finished cables (see G.2.2 and G.2.3);

--- Added the recommended ambient temperature for halogen-free flame-retardant sheathed cable installation (see G.3.1).

This section uses the redrafting method to modify the use of IEC 60502-2..2014 "rated voltage 1kV (Um = 1.2kV) to 30kV (Um =

36kV) Extruded insulated power cables and accessories Part 2.Rated voltage 6kV (Um = 7.2kV) to 30kV (Um = 36kV)

cable".

Compared with IEC 60502-2..2014, this part has some changes in structure, mainly as follows.

--- According to the requirements of GB/T 1.1-2009, the suspension section of 17.9 was adjusted;

--- Added Table 5 and Table 25;

--- Adjusted the number of the table in the order mentioned, starting from Table 6, the correspondence between the table of this part and the table of IEC 60502-2..2014

Table 6 corresponds to Table 5, Table 7 corresponds to Table 6, Table 8 corresponds to Table 7, Table 9 corresponds to Table 8, Table 10 corresponds to Table 9, Table 11 corresponds to Table 10,

Table 12 corresponds to Table 11, Table 13 corresponds to Table 12, Table 14 corresponds to Table 13, Table 15 corresponds to Table 19, Table 16 corresponds to Table 23, Table 17 pairs

Table 15, Table 18 corresponds to Table 14, Table 19 corresponds to Table 16, Table 20 corresponds to Table 17, Table 21 corresponds to Table 20, Table 22 corresponds to Table 21,

Table 23 corresponds to Table 18, Table 24 corresponds to Table 22;

--- Removed 12.1 and 12.2;

--- Increased 17.11, 17.12, 19.25 and 19.26;

--- Added Chapter 21;

--- Deleted Appendix B, added Appendix G, so that the appendix number has changed. Appendix B of this part corresponds to IEC 60502-2..2014

Appendix C, Appendix C corresponds to Appendix G of IEC 60502-2..2014.

There are technical differences between this part and IEC 60502-2..2014.The main technical differences and their causes are as follows.

--- With regard to normative quotation documents, this part has been adjusted with technical differences to adapt to my country's technical conditions and adjustments

The situation is reflected in Chapter 2 "Regulatory Reference Documents", with specific adjustments as follows.

* Replaced IEC 60038 (see 4.1) with GB/T 156 modified to adopt international standards;

* Replaced IEC 60811-201, IEC 60811-202 with GB/T 2951.11-2008 equivalent to international standards

IEC 60811-203 and IEC 60811-501 (see 17.5.1, 17.8, 19.2.2, 19.3.2, 19.4.2, 19.5.3, 19.6.1,

19.6.3, 19.21.1, Table 16, Table 20 and Table 21);

* Replaced IEC 60811-401 with GB/T 2951.12-2008 equivalent to international standards (see 19.5.2, 19.6.2,

19.7, Table 20 and Table 21);

* Replaced IEC 60811-402, IEC 60811-502 with GB/T 2951.13-2008 equivalent to international standards

IEC 60811-503 and IEC 60811-606 (see 19.15.1, 19.18.1, 19.22.1, 19.25.1, Table 15, Table 23, Table 24

And Table 25);

* Replaced IEC 60811-504, IEC 60811-505 and IEC 60811-504 with GB/T 2951.14-2008 equivalent to adopting international standards

IEC 60811-506 (see 19.10, Table 22, Table 23 and Table 25);

* Replaced IEC 60811-403, IEC 60811-404 and IEC 60811-403 with GB/T 2951.21-2008 equivalent to adopting international standards

IEC 60811-507 (see 17.10.1, 19.12, 19.14.1, Table 15 and Table 16);

* Replace IEC 60811-508 and IEC 60811-509 with GB/T 2951.31-2008 equivalent to the international standard (see

19.9, 19.11, Table 22, Table 23, Table 24 and Table 25);

* Replaced IEC 60811-405 and IEC 60811-409 with GB/T 2951.32-2008 equivalent to international standards (see

19.8.1, 19.19.1, Table 22 and Table 23);

* Replaced IEC 60811-605 with GB/T 2951.41-2008 equivalent to international standards (see 19.17.1 and Table 24);

* Added reference to GB/T 3048.10 (see 13.3.3 and 14.1);

* Replaced IEC 60885-3 with GB/T 3048.12 modified to adopt international standards (see 16.3 and 18.2.5);

* Replaced IEC 60230 with GB/T 3048.13 modified to adopt international standards (see 15.3, 18.2.8 and 18.3.5.1);

* Replace IEC 60228 with GB/T 3956 equivalent to international standards (see Chapter 5, 10.2.1, 16.2 and 17.4);

* Added reference to GB/T 6995.3 (see G.2.3);

* Added reference to GB/T 7113.2 (see 19.16.6.1 and Table 5);

* Added reference to GB/T 8170 (see B.3);

* Added reference to GB/T 11017.2-2014 (see 10.2.2);

* Added reference to GB/T 11091 (see 10.2.3);

* Added reference to GB/T 12706.1 (see Tables 2, 17.11 and 17.12);

* Replaced IEC 60060-1 with GB/T 16927.1 modified to adopt international standards (see 15.3);

* Replaced IEC 60060-3 with GB/T 16927.3 modified to adopt international standards (see 20.3.1);

* Removed IEC 60287-3-1;

* Added references to GB/T 17650.1 and GB/T 17650.2 (see 19.16 and Table 5);

* Add references to GB/T 18380.11 and GB/T 18380.13 (see 19.16.1);

* Replaced IEC 60332-1-2 with GB/T 18380.12 equivalent to international standards (see 19.16.1);

* Added references to GB/T 18380.33, GB/T 18380.34, GB/T 18380.35 and GB/T 18380.36

19.16.2);

* Added reference to GB/T 19666 (see G.1.3);

* Added reference to JB/T 8137 (all parts) (see G.2.4.1);

* JB/T 8996, which is a non-equivalent international standard, replaces IEC 60183 (see 4.1);

* Increased reference to IEC 61034-2 (see 19.16.3);

* The non-normative references of IEC 60853 and IEC 60986 are included in the references.

--- In order to adapt to the technical requirements of our country, the hypothetical value terminology has been deleted (see Chapter 3);

--- In order to meet the technical requirements of our country, the nominal insulation thickness of the rated voltage 18/20 (24) kV cable has been added (see Table 7 and

Table 8);

--- In order to adapt to the technical requirements of my country, the thickness regulations (see 8.2.3 and 8.2.4) and technical requirements of the inner liner of the extrusion and wrapping are revised

(See 17.5, 17.12, 19.3 and 19.26);

--- In order to meet the technical requirements of my country, the thickness test requirements of the extruded inner lining have been increased (see 17.5 and 193.);

--- In order to clarify the requirements of copper tape materials for cables, the content of copper tape raw materials has been added (see 10.2.3);

--- In order to ensure the quality of the extruded insulation sleeve and outer sheath, the spark test requirements for the extruded insulation sleeve and outer sheath (see 13.3.3 and

14.1);

--- In order to meet the technical requirements of my country, the thickness of thick round metal wire and the nominal thickness gauge of the insulating sleeve or inner liner under armor are added

(See 13.4, Tables 10 and 13.6);

--- In order to meet the technical requirements of my country, add halogen-free flame retardant sheath materials (see Tables 4 and 14.2) and the corresponding requirements and tests (see

19.16, 19.25, Table 5 and Table 24);

--- In order to meet the technical requirements of our country, the regulations and measurement of wrap rate and gap ratio (see 17.11) and the inner liner of the wrap are added

And/or thickness measurement of tape cushion (see 17.12 and 19.26);

--- In order to improve the domestic combustion requirements for power cables, the cable non-flammability test was modified (see 19.16);

--- In order to improve the domestic technical requirements for power cables, the rules for rounding up of specified values (see B.3) and supplementary articles for cable products are added

(See Chapter 21 and Appendix G).

The following editorial changes have been made in this section.

--- In order to adapt to my country's technical standard system, the standard name was changed to "rated voltage 1kV (Um = 1.2kV) to 35kV (Um = 40.5kV)

Extruded insulated power cables and accessories Part 2.Rated voltage 6kV (Um = 7.2kV) to 30kV (Um = 36kV)

cable";

--- Deleted the informative appendix B of IEC 60502-2..2014 "The rated voltage of 3.6/6kV to 18/30kV extruded insulated cable

Continuous Ampacity List ".

This part is proposed by China Electrical Equipment Industry Association.

This part is under the jurisdiction of the National Wire and Cable Standardization Technical Committee (SAC/TC213).

This section was drafted by. Shanghai Cable Research Institute Co., Ltd., China Electric Power Research Institute, Shanghai National Cable Testing Center Co., Ltd., Bao

Sheng Technology Innovation Co., Ltd., Jiangsu Shangshang Cable Group Co., Ltd., Far East Cable Co., Ltd., Wuxi Jiangnan Cable Co., Ltd., China

Sky Technology Submarine Cable Co., Ltd., Zhejiang Wanma Co., Ltd., Hangzhou Cable Co., Ltd., Jiangsu Hengtong Power Cable Co., Ltd., Qing

Daohan Cable Co., Ltd., Jinbei Electric Co., Ltd., Guangzhou Nanyang Cable Co., Ltd., Fujian Nanping Solar Cable Co., Ltd.

Division, Shanghai Huapu Cable Co., Ltd., Ningbo Ball Crown Cable Co., Ltd., Kunming Cable Group Co., Ltd., Hangzhou Huaxin Power Line

Cable Co., Ltd., Shanghai Feihang Wire and Cable Co., Ltd., Zhengzhou Huali Cable Co., Ltd., Yangzhou Shuguang Cable Co., Ltd., Lexing Red

Qi Cable (Hubei) Co., Ltd., Hainan Weite Electric Group Co., Ltd., Lanzhou Zhongbang Wire and Cable Group Co., Ltd., Shanghai Pudong Wire

Cable (Group) Co., Ltd., Shandong Taikai Cable Co., Ltd.