GB/T 12706.1-2020 PDF English
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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 1: Cables for rated voltage of 1 kV (Um=1.2 kV) and 3 kV (Um=3.6 kV)
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Power cables with extruded insulation and their accessories for rate voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV) -- Part 1: Cables for rated voltage of 1 kV (Um=1.2 kV) and 2 kV (Um=3.6 kV)
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Rated voltage of 1 kV (Um = 1. 2 kV) to 35 kV (Um = 40. 5 kV) extruded insulation power cables and accessories -- Part 1: The rated voltage of 1 kV (Um = 1. 2 kV) and 3 kV (Um = 3. 6 kV) cable
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Copper or aluminium conductor extruded plastic insulated power cables with rated voltages up to 35kV--Part 1: General
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GB/T 12706.1-2020: 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 1: Cables for rated voltage of 1 kV (Um=1.2 kV) and 3 kV (Um=3.6 kV)
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
Replacing GB/T 12706.1-2008
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 1.Cables for Rated Voltage of 1 kV (Um = 1.2 kV)
and 3 kV (Um = 3.6 kV)
[IEC 60502-1.2004, Power Cables with Extruded Insulation and Their Accessories for
Rated Voltages from 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV) - Part 1.Cables for
Rated Voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV), MOD]
Issued on. MARCH 31, 2020
Implemented on. OCTOBER 1, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 4
1 Scope... 11
2 Normative References... 11
3 Terms and Definitions... 14
4 Voltage Marking and Materials... 15
5 Conductors... 18
6 Insulation... 18
7 Cores, Inner Coverings and Fillers of Multi-core Cables... 21
8 Metallic Layers for Single-core or Multi-core Cables... 24
9 Metallic Screen... 24
10 Concentric Conductor... 25
11 Lead Sheath... 26
12 Metallic Armor... 26
13 Over-sheath... 30
14 Test Conditions... 32
15 Routine Tests... 32
16 Sample Tests... 34
17 Electrical Type Tests... 41
18 Non-electrical Type Tests... 44
19 Electrical Tests after Installation... 53
20 Supplementary Clauses for Cable Products... 53
Appendix A (normative) Fictitious Calculation Method for Determination of
Dimensions of Protective Coverings... 61
Appendix B (normative) Rounding-off of Numerical Values... 69
Appendix C (normative) Measurement and Calculation of Overlap Rate and
Clearance Rate... 72
Appendix D (normative) Determination of Hardness of HEPR Insulations... 73
Appendix E (normative) Supplementary Clauses for Cable Products... 76
Bibliography... 82
Foreword
GB/T 12706 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) is divided into 4 parts.
---Part 1.Cables for Rated Voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV);
---Part 2.Cables for Rated Voltages from 6 kV (Um = 7.2 kV) up to 30 kV (Um = 36
kV);
---Part 3.Cables for Rated Voltages of 35 kV (Um = 40.5 kV);
---Part 4.Test Requirements on Accessories for Cables with Rated Voltages from
6 kV (Um = 7.2 kV) up to 35 kV (Um = 40.5 kV).
This is Part 1 of GB/T 12706.
This Part serves as a replacement of GB/T 12706.1-2008 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 1.Cables for Rated Voltage of 1 kV (Um = 1.2 kV) and 3 kV
(Um = 3.6 kV).
In comparison with GB/T 12706.1-2008, apart from editorial modifications, this Part
has the following main technical changes.
---The requirements for materials of inner coverings are modified (see 7.2.2; 7.1.2
of Version 2008);
---The stipulations of extruded inner coverings are modified (see 7.2.3 and Table
9; 7.1.3 and Table 8 of Version 2008);
---The stipulations of lapped inner coverings are modified (see 7.2.4; 7.1.4 of
Version 2008);
---The stipulations of copper tape screen overlap rate are modified (see 9.2.3;
9.2.3 of Version 2008);
---The calculation formula of the nominal thickness of lead sheath is modified (see
Chapter 11; Chapter 11 of Version 2008);
---The stipulations of armor materials are modified (see 12.2; 12.2 of Version 2008);
---The stipulations of nominal diameter of thick round metal wires and the
stipulations of nominal thickness of separation sheath or inner coverings under
the armor are added (see 12.4, Table 10 and 12.6);
---The stipulations of over-sheath thickness are modified (see 13.3; 13.3 of Version
2008);
---The requirements for direct-current resistance of aluminum alloy conductors are
added (see 15.2);
---The requirements for the measurement of non-metallic sheaths are modified
(see 16.5; 16.5 of Version 2008);
---The measurement of overlap rate and clearance rate of lapped tape is added
(see 16.10 and 16.11);
---The measurement of the thickness of lapped inner coverings and / or lapped
beddings is added (see 16.12 and 18.4);
---The requirements for the measurement of non-metallic sheaths are modified
(see 18.3; 18.2 of Version 2008);
---The requirements for pressure test at high temperature are modified (see 18.9.1;
18.7.1 of Version 2008);
---The requirements for flame retardancy test on single cables are modified (see
18.16.1; 18.14.1 of Version 2008);
---The requirements for flame retardancy test on bunched cables are modified (see
18.16.2; 18.14.2 of Version 2008);
---The requirements for smoke density test are modified (see 18.16.3; 18.14.3 of
Version 2008);
---The applicable object of the measurement of carbon black content of black PE
over-sheaths is modified (see 18.17.1; 18.15.1 of Version 2008);
---The time under load of hot set test is deleted (see Table 14 and Table 15; Table
17 and Table 22 of Version 2008);
---The calculation formula of fictitious diameter of cable core of three-core cable
with a small cross-section is added (see A.2.3);
---The rounding-off rules for specified values are added (see B.3);
---The measurement and calculation of the overlap rate and clearance rate of
lapped tape are added (see Appendix C);
---The requirements for the delivery length and marking of finished cables are
added (see E.3.2 and E.3.3);
---The recommended ambient temperature for the installation of halogen-free
flame-retardant sheathed cable is added (see E.4.1).
This Part uses the re-drafting method in the modification and adoption of IEC 60502-
1.2004 Power Cables with Extruded Insulation and Their Accessories for Rated
Voltages from 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV) - Part 1.Cables for Rated
Voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV). Meanwhile, the content of
AMD1.2009 CSV is introduced and marked with a vertical double line () on the outer
margin of the corresponding clause.
In comparison with IEC 60502-1.2004, this Part has certain structural changes as
follows.
---In accordance with the requirements of GB/T 1.1-2009, the suspended
paragraphs are adjusted; 7.1, 16.6.1, 17.1, 18.1, 18.19.1 and D.2.1 are added,
as a continuance of the subsequent clause numbers;
---In accordance with the sequence of being mentioned, table numbers are
adjusted; starting from Table 5, the correspondence of tables between this Part
and IEC 60502-1.2009 is as follows. Table 5 corresponds to Table 23, 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 17, Table 15
corresponds to Table 22, Table 16 corresponds to Table 13, Table 17
corresponds to Table 14, Table 18 corresponds to Table 15, Table 19
corresponds to Table 18, Table 20 corresponds to Table 19, Table 21
corresponds to Table 16, Table 22 corresponds to Table 20, Table 23
corresponds to Table 21;
---11.1 and 11.2 are deleted;
---16.10, 16.11, 16.12, 18.4 and B.3 are added;
---Chapter 20 is added;
---Appendix C and Appendix E are added, which changes appendix numbers.
Appendix D of this Part corresponds to Appendix C of IEC 60502-1.2009.
In comparison with IEC 60502-1.2004, this Part has technical differences. The main
technical differences and the causes for the differences are as follows.
---In terms of Normative References, this Part makes certain adjustments with
technical differences, so as to adapt to the technical conditions of China. The
adjustments are intensively reflected in Chapter 2 “Normative References”. See
the specific adjustments below.
GB/T 156, which modifies and adopts international standard, is used to
replace IEC 60038.1983 (see 4.1);
GB/T 2951.11-2008, which equivalently adopts international standard, is
used to replace IEC 60811-1-1.1993 (see 16.5.1, 16.8, 16.12.1, 18.2.2,
18.3.2, 18.5, 18.6, 18.21.1, Table 18 and Table 19);
GB/T 2951.13-2008, which equivalently adopts international standard, is
used to replace IEC 60811-1-3.1993 (see 18.15, 18.18.1, 18.22.1, 18.24.1,
Table 14, Table 21, Table 22 and Table 23);
GB/T 2951.21-2008, which equivalently adopts international standard, is
used to replace IEC 60811-2-1.1998 (see 16.9.1, 18.12, 18.14.1, Table 14
and Table 15);
GB/T 2951.41-2008, which equivalently adopts international standard, is
used to replace IEC 60811-4-1.1985 (see 18.17.1 and Table 22);
The reference of GB/T 3048.10 is added (see 12.3.3 and 13.1);
GB/T 3048.13, which modifies and adopts international standard, is used
to replace IEC 60230.1966 (see 14.3 and 17.5.1);
GB/T 3956, which equivalently adopts international standard, is used to
replace IEC 60228.1978 (see Chapter 5, 9.2.1, 15.2 and 16.4);
The references of GB/T 6995.3 and GB/T 6995.5 are added (see E.3.3);
GB/T 7113.2, which modifies and adopts international standard, is used to
replace IEC 60684-2.1987 (see 18.16.6.1 and Table 5);
The reference of GB/T 8170 is added (see B.3);
The reference of GB/T 11017.2-2014 is added (see 9.2.2);
The reference of GB/T 11091 is added (see 9.2.3);
GB/T 12706.2, which modifies and adopts international standard, is used
to replace IEC 60502-2.1997 (see Chapter 4);
GB/T 16927.1, which modifies and adopts international standard, is used
to replace IEC 60060-1.1989 (see 14.3);
GB/T 17650.1, which equivalently adopts international standard, is used to
replace IEC 60754-1.1994 (see Table 5 and 18.16.4);
GB/T 17650.2, which equivalently adopts international standard, is used to
replace IEC 60754-2.1991 (see Table 5 and 18.16.5);
GB/T 18380.11, GB/T 18380.12 and GB/T 18380.13, which equivalently
adopt international standard, are used to replace IEC 60332-1.1993 (see
18.16.1);
The references of GB/T 18380.33, GB/T 18380.34 and GB/T 18380.36 are
added (see 18.16.2);
The reference of GB/T 19666 is added (see E.1.3);
The reference of JB/T 8137 (all parts) is added (see E.3.4.1);
JB/T 8996, whose consistent correspondence with international standard
is non-equivalent, is used to replace IEC 60183.1984 (see 4.1);
The non-normative reference of IEC 60724 is brought into Bibliography;
IEC 61034-2.1997 and ISO 48.1994 are modified into undated references.
---In order to adapt to the technical requirements of China, the term and definition
of fictitious value is deleted (see Chapter 3);
---In order to adapt to the technical requirements of China, the stipulations (see
7.2.3 and 7.2.4) and technical requirements (see 12.7, 16.5 and 18.3) of the
thickness of extruded and lapped inner coverings are modified;
---The stipulations of thickness of other metallic sheaths are deleted (see Chapter
11);
---In order to adapt to the technical requirements of China, the measurement of
overlap rate (see 16.10) and the measurement of clearance rate (see 16.11)
are added;
---In order to adapt to the technical requirements of China, the measurement (see
16.12) and technical requirements (see 18.4) of the total thickness of lapped
inner coverings and / or lapped beddings are added;
---In order to clarify the requirements of copper tape materials for cables, the
requirements for copper raw materials are added (see 9.2.3);
---In order to guarantee the quality of the extruded separation sheath and the over-
sheath, the requirements for the spark test of the extruded separation sheath
(see 12.3.3) and the requirements for the spark test of the over-sheath (see
13.1) are added;
---In order to adapt to the technical requirements of China, the stipulations of
diameter of thick round metal wires and the stipulations of thickness of
separation sheath or inner coverings under the armor are added (see 12.4,
Table 10 and 12.6);
---In order to adapt to the technical requirements of China, the requirements for
direct-current resistance of aluminum alloy conductors are added (see 15.2);
---In order to adapt to the technical requirements of China, the scope of application
and requirements for the combustion characteristic test (see 18.16.1 and
18.16.2) and the applicable object of the carbon black test (see 18.17.1) are
modified;
---In order to improve the domestic technical requirements for power cables,
supplementary clauses for cable products are added (see Chapter 20 and
Appendix E);
---The calculation formulas of fictitious diameter of cable core of three-core cable
with a small cross-section, and five-core cable with a small cross-section and
two small cross-sections are added (see A.2.3); the rounding-off rules for
specified values are added (see B.3), so as to satisfy the technical
requirements of China;
---In order to clarify the overlap rate and clearance rate, the measurement and
calculation of overlap rate and clearance rate are added (see Appendix C).
This Part makes the following editorial modifications.
---In order to adapt to the technical standard system of China, the title of the
standard is modified into 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 1.Cables for Rated Voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6
kV);
---Bibliography is added.
This Part was proposed by China Electrical Equipment Industry Association.
This Part shall be under the jurisdiction of National Technical Committee 213 on Wire
and Cables of Standardization Administration of China (SAC/TC 213).
The drafting organizations of this Part. Shanghai Cable Research Institute Co., Ltd.;
Shanghai National Center of Testing and Inspection for Electric Cable and Wire Co.,
Ltd.; Jiangsu Hengtong Power Cable Co., Ltd.; Jiangsu Shangshang Cable Group;
Baosheng Science & Technology Innovation Co., Ltd.; Far East Cable Co., Ltd.;
Zhongtian Technology Submarine Cables Co., Ltd.; Zhejiang Wanma Co., Ltd.;
Hangzhou Cable Co., Ltd.; Wuxi Jiangnan Cable Co., Ltd.; Qingdao Hanhe Cable Co.,
Ltd.; China Electric Power Research Institute; Guangzhou Nanyang Cable Group Co.,
Ltd.; Fujian Nan Ping Sun Cable Co., Ltd.; Shanghai Huapu Cable Co., Ltd.; Ningbo
Qrunning Cable Co., Ltd.; Kun Ming Cable Group; Hangzhou Huaxin Power Cable Co.,
Ltd.; Tongding TDII Group Co., Ltd.; Gold Cup Electric Co., Ltd.; Lanzhou Zhongbang
Group Co., Ltd.; Shanghai Feihang Wire & Cable Co., Ltd.; Zhengzhou Huali Cable
Co., Ltd.; Yangzhou Shuguang Cable Co., Ltd.; Lexing Hongqi Cable (Hubei) Co., Ltd.;
Hainan Weite Electric Group Co., Ltd.; Shanghai Pudong Wire and Cable Group;
Shandong Taikai Cable Co., Ltd.
The main drafters of this Part. Sun Jiansheng, Peng Chunyao, Guan Xinyuan, Li Bin,
Fang Quansheng, Wang Chuanbin, Xie Shuhong, Liu Huanxin, Teng Zhaofeng, Bao
Qiwei, Wang Ye, Peng Chao, Wang Zhihui, Fan Defa, Zhou Yan, Wen Shanghai, Xi
Youjian, Guo Haijun, Zhou Hongpeng, Yang Wenfeng, Wei Yongqian, Hu Shaozhong,
Zhao Jianshan, Liang Guohua, Wang Boyi, Li Ju, Chen Wei, Li Zhong, Xu Xiaofeng,
Guo Rongrong, Du Qing.
The issuing of the previous versions.
---GB 12706.1-1991, GB/T 12706.1-2002, GB/T 12706.1-2008;
---GB 12706.2-1991, GB 12706.3-1991.
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 1.Cables for
Rated Voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6
kV)
1 Scope
This Part of GB/T 12706 specifies the structure, dimensions and test requirements for
power cables with extruded insulation for rated voltage of 1 kV (Um = 1.2 kV) and 3 kV
(Um = 3.6 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 156 Standard Voltages (GB/T 156-2017, IEC 60038.2009, MOD)
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 - Tests for Determining the Mechanical
Properties (IEC 60811-1-1.2001, IDT)
3 Terms and Definitions
The following terms and definitions are applicable to this document.
Sample tests are tests carried out by the manufacturer on finished cable specimens or
some parts taken from finished cables at a specified frequency to check whether the
cables meet the specified requirements.
4 Voltage Marking and Materials
For example, under normal operating conditions, if the cable is directly buried in the
ground, in accordance with the maximum conductor temperature specified in Table 3,
the cable is operated under continuous load (100% load factor), after a certain time,
the thermal resistance coefficient of the soil around the cable might exceed its original
value as a result of the drying-out process.
5 Conductors
The conductors shall be Type 1 or Type 2 or Type 5 plain or metal-coated annealed
copper conductors, type 1 or type 2 aluminum or aluminum alloy conductors that
comply with GB/T 3956.
6 Insulation
The nominal insulation thicknesses are shown in Table 6, Table 7 and Table 8.The
thickness of any isolation layer shall not be included in the insulation thickness.
7 Cores, Inner Coverings and Fillers of Multi-core Cables
The materials used for the inner coverings and fillers shall be suitable for the operating
temperature of the cable and compatible with the cable insulating material. Except for
longitudinal water-blocking cables, the inner coverings and fillers shall adopt non-
hygroscopic materials.
8 Metallic Layers for Single-core or Multi-core Cables
This Part includes the following types of metallic layer.
9 Metallic Screen
The metallic screen shall be composed of one or more metallic tapes, braids, or a
concentric layer of metal wires, or a combination of metal wires and tapes.
The metallic screen may also be metallic sheath, or metallic amor layer that complies
with the stipulations of 9.2.
The soft copper tapes, as the raw material of the screen, shall be copper tapes that
comply with the stipulations of GB/T 11091.
10 Concentric Conductor
The dimensions, physical properties and resistance requirements of the concentric
conductors shall comply with the stipulations of 9.2.
If a concentric conductor structure is adopted, the inner covering of multi-core cables
shall be covered with a concentric conductor layer.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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