GB/T 12706.3-2008 in English

《GB/T 12706.3-2008额定电压1kV（Um=1.2kV）到35kV （Um=40.5kV）挤包绝缘电力电缆及附件 第3部分：额定电压35kV（Um=40.5kV）电缆》由TC213（全国电线电缆标准化技术委员会）归口，主管部门为中国电器工业协会。
GB/T 12706的本部分规定了用于配电网或工业装置中，额定电压35kV固定安装的挤包绝缘电力电缆的结构、尺寸和试验要求。

1 Scope

This part of GB/T 12706 specifies the construction, dimensions and test requirements of power cables with extruded solid insulation of 35 kV for fixed installations such as distribution networks or industrial installations.

When determining applications, it is recommended that the possible risk of radial water ingress is considered. This part includes the tests of cables with longitudinal water resistance and radial waterproof structures (see Annex F for test methods).

Cables for special installation and service conditions are not included, for example cables for overhead networks, the mining industry, nuclear power plants (in and around the containment area) nor for submarine use or shipboard application.

2 Normative references

The following standards contain provisions which, through reference in this part of GB/T 12706, constitute provisions of this part. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

GB/T 156-2007 Standard voltages (IEC 60038: 2002, MOD)
GB/T 2951.11-2008 Common test methods for insulating and sheathing materials of electric cables 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)
GB/T 2951.12-2008 Common test methods for insulating and sheathing materials of electric cables - Part 12: Methods for general application - Thermal aging methods (IEC 60811-1-2: 1985, IDT)
GB/T 2951.13-2008 Common test methods for insulating and sheathing materials of electric and optical cables - Part 13: General application - Methods for determining the density - Water absorption tests - Shrinkage test (IEC 60811-1-3: 2001, IDT)
GB/T 2951.14-2008 Common test methods for insulating and sheathing materials of electric cables - Part 14: Methods for general application - Test at low temperature (IEC 60811-1-4: 1985, IDT)
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 - mineral oil immersion tests (IEC 60811-2-1: 2001, IDT)
GB/T 2951.31-2008 Common test methods for insulating and sheathing materials of electric cables - Part 31: Methods specific to PVC compounds - Pressure test at high temperature - Tests for resistance to cracking (IEC 60811-3-1: 1985, IDT)
GB/T 2951.32-2008 Common test methods for insulating and sheathing materials of electric cables - Part 32: Methods specific to PVC compounds - Loss of mass test - Thermal stability test (IEC 60811-3-2: 1985, IDT)
GB/T 2951.41-2008 Insulating and sheathing materials of electric and optical cables - Common test methods - Part 41: Methods specific to polyethylene and polypropylene compounds - Resistance to environmental stress cracking - Measurement of the melt flow index - Carbon black and/or mineral filler content measurement in polyethylene by direct combustion - Measurement of carbon black content by thermogravimetric analysis (TGA) - Assessment of carbon black dispersion in polyethylene using a microscope (IEC 60811-4-1: 2004, IDT)
CB/T 3048.10-2007 Test methods for electrical properties of electric cables and wires - Part 10: Spark test of extruded protective sheaths
GB/T 3048.12-2007 Test methods for electrical properties of electric cables and wires - Part 12: Partial discharge test (IEC 60885-3: 1988, MOD)
GB/T 3048.13-2007 Test methods for electrical properties of electric cables and wires - Part 13: Impulse voltage test (IEC 60230: 1966, IEC 60060-1: 1989, MOD)
GB/T 3956-2008 Conductors of insulated cables (IEC 60228: 2004, IDT)
GB/T 6995.3-2008 Markings for electric wires and cables - Part 3: Identifications of cables and wires
GB/T 11091-2005 Copper strips for cables
GB/T 16927.1-1997 High-voltage test techniques - Part 1: General test requirements (EQV IEC 60060-1: 1989)
GB/T 12706.2-2008 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um=1.2 kV) up to 30 kV (Um=35 kV) - Part 2: Cables for rated voltages from 6 kV (Um=7.2 kV) up to 30 kV (Um=36 kV) (IEC 60502-2: 2005, MOD)
GB/T 18380.12-2008 Tests on electric and optical fibre cables under fire conditions - Part 12: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW premixed flame (IEC 60332-1-2: 2004, IDT)
JB/T 8137-1999 (All parts) Delivery drums for electric wires and cables
JB/T 8996-1999 Guide to the selection of high-voltage cables (eqv IEC 60183: 1984)
JB/T 10181.1-2000 Calculation of the current rating of electric cables - Part 1: Current rating equations (100% load factor) and calculation of losses - Section 1: General (idt IEC 60287-1-1: 1994)
JB/T 10181.2-2000 Calculation of the current rating of electric cables - Part 1: Current rating equations (100% load factor) and calculation of losses - Section 2: Sheath eddy current loss factors for two circuits in flat formation (idt IEC 60287-1-2: 1993)
JB/T 10181.3-2000 Calculation of the current rating of electric cables - Part 2: Thermal resistance - Section 1: Calculation of thermal resistance (idt IEC 60287-2-1: 1994)
JB/T 10181.4-2000 Calculation of the current rating of electric cables - Part 2: Thermal resistance - Section 2: A methods for calculating reduction factors for groups of cables in free air, protected from solar radiation (idt IEC 60287-2-2: 1995)
JB/T 10181.5-2000 Calculation of the current rating of electric cables - Part 3: Sections on operating conditions - Section 1: Reference operating conditions and selection of cable type (idt IEC 60287-3-1: 1995)
JB/T 10181.6-2000 Calculation of the current rating of electric cables - Part 3: Sections on operating conditions - Section 2: Economic optimization of power cable size (idt IEC 60287-3-2: 1995)
JB/T 10696.6-2007 Test methods for determining mechanical physical and chemical properties of electric cables and wires - Part 6:test for abrasion of oversheaths
YB/T 024-2008 Steel strips for cable armouring

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Voltage designations and materials
5 Conductors
6 Insulation
7 Screening
8 Assembly of three-core cables, inner coverings and fillers
9 Metallic layers for single-core and three-core cables
10 Metallic screen
11 Concentric conductor
12 Metallic sheath
13 Metallic armour
14 Oversheath
15 Test conditions
16 Routine tests
17 Sample tests
18 Type tests, electrical
19 Type tests, non-electrical
20 Electrical tests after installation
21 Supplementary terms for cable products
Annex A (Normative) Fictitious calculation method for determination of dimensions of protective coverings
Annex B (Normative) Rounding of numbers
Annex C (Normative) Method of measuring resistivity of semi-conducting screens
Annex D (Normative) Water penetration test
Annex E (Normative) Determination of hardness of HEPR insulations
Annex F (Informative) Test on cable assemblies with longitudinal metal foil composite protective covering
Annex G (Normative) Supplementary provisions for cable products