GB/T 12706.3-2020 PDF English
US$585.00 · In stock · Download in 9 secondsGB/T 12706.3-2020: 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 3: Cables for rated voltages of 35 kV (Um=40.5 kV) Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 12706.3: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12706.3-2020 | English | 585 |
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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 3: Cables for rated voltages of 35 kV (Um=40.5 kV)
| Valid |
| GB/T 12706.3-2008 | English | RFQ |
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7 days
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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 12706.3-2002 | English | RFQ |
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9 days
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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 12706.3-1991 | English | 279 |
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3 days
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Copper or aluminium conductor extruded plastic insulated power cables with rated voltages up to 35kV--Part 3: Cross-linked polyethylene insulated power cables
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 12706.3-2020
GB/T 12706.3-2020: 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 3: Cables for rated voltages of 35 kV (Um=40.5 kV)
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12706.3-2020
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
References... 76
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
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.
3.2.2
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.
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.
4.3 Sheathing compounds
See Table 4 for the maximum conductor temperatures of cables of different types of
sheathing compounds.
5 Conductors
The conductor shall be the second type of metal-plated or non-metal-plated annealed
copper conductor in compliance with GB/T 3956, or the second type of aluminum or
aluminum alloy conductor. The second conductor can also be of a longitudinal water-
blocking structure.
6 Insulation
6.1 Materials
The insulation shall be an extruded dielectric as listed in Table 2.
The insulation of halogen-free cables shall comply with the requirements in Table 5.
6.2 Insulation thickness
See Table 6 for nominal insulation thickness.
The thickness of any isolation layer or semiconductive shielding layer outside the
conductor or insulation shall not be included in the insulation thickness.
7 Shield
7.1 General
All cables shall have a phase-separated metal shield on the insulated cores.
The shield of the insulated core of a single-core or three-core cable shall consist of a
conductor shield and an insulation shield.
7.3 Insulation shield
The insulation shield shall be composed of a non-metallic semiconducting layer and a
metal layer.
8 Core, lining and filling of three-core cable
8.1 General
Each insulated core of the three-core cable core shall have a metal shielding layer.
8.2 and 8.3 do not apply to cable cores of sheathed single-core cables.
8.2 Lining and filling
8.2.1 Structure
An extruded lining shall be used.
It is allowed to tighten with suitable tape before extruding the lining layer.
8.2.3 Extruded lining
See Table 7 for the nominal thickness of the extruded lining.
8.3 Cable cores with phase-separated metal layers (see Chapter 10)
The metal layers of the individual insulated cores shall be in contact with each other.
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.
9 Metal layer of single-core or three-core cable
This Part includes the following types of metal layers.
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.
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
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.
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.
11.3 Use
If a concentric conductor structure is required, the concentric conductor layer can be
covered outside the lining of the three-core cable or, for single-core cables, directly on
the insulation, on the semi-conductive insulation shielding layer, or on the appropriate
lining.
12 Lead sheath of the metal sheath
The lead sheath shall be made of lead or lead alloy, with a seamless lead pipe of
appropriate tightness formed.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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