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GB/T 12706.4-2008 English PDF (GBT12706.4-2008)

GB/T 12706.4-2008 English PDF (GBT12706.4-2008)

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GB/T 12706.4-2008: Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV) -- Part 4: Test requirements on accessories for cables with rated voltages from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV)

This Part of GB/T 12706 specifies the type test and test requirements of the accessories for extruded insulation power cables with rated voltages from 3.6/6 kV (7.2kV) up to 26/35 kV (40.5kV), complying with GB/T 12706.2-2008 or GB/T 12706.3-2008.
GB/T 12706.4-2008
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 29.060.20
K 13
Replacing GB/T 12706.4-2002
Power Cables with Extruded Insulation and their Accessories for
Rated Voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV) -
Part 4: Test Requirements on Accessories for Cables with Rated
Voltages from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV)
(IEC 60502-4:2005, Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 30kV (Um=36kV) ?€? Part 4: Test
Requirements on Accessories for Cables with Rated Voltages from 6kV (Um=7.2kV) up to 30kV (Um=36kV), MOD)
ISSUED ON: DECEMBER 31, 2008
IMPLEMENTED ON: NOVEMBER 01, 2009
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Types of Accessory ... 9
5 Voltage Designations and Maximum Conductor Temperature ... 10
6 Assembly of Accessories to be Tested ... 10
7 Range of Approval ... 12
8 Test Procedures ... 13
9 Test Results ... 14
Appendix A (Informative) Identification of Test Cable ... 32
Appendix B (Informative) Technical Differences and their Causes between this Part and IEC 60502-4:2005 ... 33
Foreword
GB/T 12706 Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV) can be divided into the following 4 parts:
--- Part 1: Cables for Rated Voltages from 1kV (Um=1.2kV) up to 3kV (Um=3.6kV); --- Part 2: Cables for Rated Voltages from 6kV (Um=7.2kV) up to 30kV (Um=36kV); --- Part 3: Cables for Rated Voltages of 35kV (Um=40.5kV);
--- Part 4: Test Requirements on Accessories for Cables with Rated Voltage from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV).
This Part belongs to Part 4 of GB/T 12706.
This Part modifies and adopts IEC 60502-4:2005 Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 30kV (Um=36kV) ?€? Part 4: Test Requirements on Accessories for Cables with Rated Voltages from 6kV (Um=7.2kV) up to 30kV (Um=36kV); Edition 2 (English Version).
This Part was redrafted according to IEC 60502-4:2005. In addition to adding the informative Annex B, the structure of this Part is the same as IEC 60502-4:2005. Considering Chinese national conditions, when adopting IEC 60502-4:2005, some changes have been made in this Part. The relevant technical differences have been incorporated into the text and are marked with vertical single lines in the margins of the articles they cover; and the Annex B gives a list of these technical differences and their causes.
For the sake of use, when adopting IEC 60502-4:2005, this Part makes the following editorial changes:
--- Change ?€?this Standard?€? into ?€?this Part?€?;
--- Delete the foreword of IEC 60502-4:2005;
--- Replace the comma ?€?,?€? working as the decimal point by the decimal point ?€?.?€?. This Part replaced GB/T 12706.4-2002 Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV) ?€? Part 4: Test Requirements on Accessories for Cables wit Rated Voltages from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV).
Compared with GB/T 12706.4-2002, This Part has the major changes as follows: Power Cables with Extruded Insulation and
their Accessories for Rated Voltages from 1kV
(Um=1.2kV) up to 35kV (Um=40.5kV) ?€? Part 4: Test
Requirements on Accessories for Cables with Rated
Voltages from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV)
1 Scope
This Part of GB/T 12706 specifies the type test and test requirements of the accessories for extruded insulation power cables with rated voltages from 3.6/6 kV (7.2kV) up to 26/35 kV (40.5kV), complying with GB/T 12706.2-2008 or GB/T 12706.3- 2008.
This Part excludes the accessories used under special conditions, such as aerial cables, submarine or ship cables or hazardous situations (explosive environments, fire resistant cables or seismic conditions).
Formerly, approvals on products covered by this Part have been achieved on the basis of obtaining the national standards and/or the demonstration of satisfactory service performance. This Part does not invalidate existing approvals. However, products approved according to those former standards or specifications cannot claim approval to this Part unless specifically tested to it.
It is not necessary to repeat these tests, once pass the tests, unless changes are made in the materials, design or manufacturing process which might affect the service performance characteristics...
Test methods are included in GB/T 18889-2002.
2 Normative References
The provisions in following documents become the provisions of this Part through reference in this Part of GB/T 12706. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Part, however, parties who reach an agreement based on this Part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 2900.10-2001 Electrotechnical Vocabulary ?€? Electric Cables (IEC 60050 (461):1984, IDT)
GB/T 12706.2-2008 Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV) ?€? Part 2: Cables for Rated Voltages from 6kV (Um=7.2kV) up to 30kV (Um=36kV) (IEC 60502- 2:2005, Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 30kV (Um=36kV) ?€? Part 2: Cables for Rated Voltages from 6kV (Um=7.2kV) up to 30kV (Um=36kV), MOD)
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) (IEC 60502-2:2005, Power Cables with Extruded Insulation and their Accessories for Rated Voltages from 1kV (Um=1.2kV) up to 30kV (Um=36kV) ?€? Part 2: Cables for Rated Voltages from 6kV (Um=7.2kV) up to 30kV (Um=36kV), NEQ)
GB/T 12976.3-2008 Paper-Insulated Power Cables and their Accessories wit Rated Voltages up to and including 35kV (Um=40.5kV) ?€? Part 3: Test on Cables and their Accessories (IEC 60055-1:2005, Paper-Insulated Metal-Sheathed Cables for Rated Voltages up to 18/30kV (with Copper or Aluminum conductors and Excluding Gas-Pressure and Oil-Filled Cables) ?€? Part 1: Tests on Cables and their Accessories, MOD)
GB/T 18889-2002 Electric Cables ?€? Test Methods for Accessories for Power Cables with Rated Voltages from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV) (IEC 61442:1997, Test Methods for Accessories for Power Cables wit Rated Voltages from 6kV (Um=7.2kV) up to 30kV (Um=36kV), MOD)
JB/T 8996-1999 Guide to the Selection of High-Voltage Cables (eqv IEC
60183:1984)
3 Terms and Definitions
For the purpose of this Part, the terms and definitions defined in GB/T 2900.10-2001 and the following apply.
3.1 Connector
Metallic device to connect cable conductors together.
3.2 Termination
Device fitted to the end of a cable to ensure electrical connection with other parts of the system and to maintain the insulation up to the point of connection. Separable connector in which the electrical contact is made by a sliding device. 3.15 Bolted-type separable connector
Separable connector in which the electrical contact is made by a bolted device. 3.16 Deadbreak connector
Separable connector designed to be connected or disconnected on de-energized circuits only.
3.17 Loadbreak connector
Separable connector designed to be connected or disconnected on energized circuits. 3.18 Range-taking accessory
Accessory designed to take more than one cross-section of cable.
3.19 Tracking
Irreversible degradation by formation of paths, which are conductive even under dry conditions, starting and developing on the surface of an insulating material and which may occur on surfaces in contact with air and also on the interfaces between different insulating materials.
3.20 Erosion
Irreversible and non-conducting degradation of the surface of the insulator that occurs by loss of material, and which may be uniform, localized or tree shaped. NOTE: Shallow surface traces, commonly tree-shaped, may occur on terminations, after partial flashover. These traces are acceptable as long as they are non-conductive. When they are conductive, they are classed as tracking.
3.21 Metallic housing
Metal enclosure in intimate contact with the outer screen of a separable connector and having at least the same current carrying capacity to earth as the metallic screen of the cable with which the separable connector is to be used.
4 Types of Accessory
The accessories covered by this Part are listed below:
--- indoor and outdoor terminations of all structures, including terminal boxes; thermal or mechanical performance of the test assemblies...
NOTE: Contact with chemicals, e.g. transformer oil, may affect the properties of the accessory and shall be avoided.
6.2.4 Unless otherwise specified, separable connectors shall be connected to their mating bushing...
6.2.5 The connection between the terminal under test or the separable connector and the terminal or bushing shall have the same conductive cross-sectional area as the cable conductor
6.2.6 The minimum phase-to-phase and phase-to-earth clearances of the unscreened separable connectors recommended by the manufacturer shall be tested.
6.2.7 Where branch joints are to be tested, only the main cable shall carry the heating current.
6.2.8 The main details regarding test mounting, especially supporting devices, shall be recorded.
6.2.9 Test arrangements and number of samples are detailed in Figures 1 ~ 5. 7 Range of Approval
7.1 One type of range-taking accessories and non- range-taking accessories shall use one of the conductor cross-sections specified in 6.2.1 to successfully complete the corresponding type test items specified in this Part listed in Tables 4 to 9, and shall be considered valid for all cross-sections in the range from 95mm2 to 300mm2. Extension of approval to a range wider than that given above shall be achieved by carrying out the additional tests listed in Table 10 on the smallest and/or largest conductor cross-sectional areas of the required range.
7.2 Approval is independent of the cable conductor material; tests may therefore be carried out using cables with either aluminum or copper conductors.
7.3 Tests performed on accessories installed on cables having shaped conductors shall be deemed to cover the same type of accessory when used on cables having circular conductors. The converse will not apply.
In order to achieve extension of approval from circular to fan-shaped conductors, additional tests shall be performed according to Table 11. Stop-ends shall be tested as in Table 6 using half the number of samples in Figure 3.
7.4 Approval is dependent on the cable insulation tested as detailed in Table 2.

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