GB/T 12706.4-2020 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 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)
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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 4: Test requirements on accessories for cables with rated voltages from 6kV (Um=7.2kV) up to 35kV (Um=40.5kV)
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Extruded insulation rated voltage of 1 kV (Um = 1. 2 kV) to 35 kV (Um = 40. 5 kV) power cables and accessories -- Part 4: The rated voltage of 6 kV (Um = 7. 2 kV) to 35 kV (Um = 40. 5 kV) power Cable Test requirements on accessories
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GB/T 12706.4-2020: PDF in English (GBT 12706.4-2020) GB/T 12706.4-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
Replacing 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)
[IEC 60502-4:2010, 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: 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 ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Type of Accessory ... 9
5 Voltage Designations and Maximum Conductor Temperatures ... 9
6 Assembly of Accessories to be Tested ... 9
7 Range of Approval ... 11
8 Test Sequences ... 12
9 Test Results ... 13
Annex A (Informative) Identification of Test Cable ... 32
Bibliography ... 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) consists of the following 4 parts:
--- Part 1: Cables for Rated Voltage of 1kV (Um = 1.2kV) and 3kV (Um = 3.6kV);
--- Part 2: Cables for Rated Voltage of 6kV (Um = 7.2kV) and 30kV (Um = 36kV);
--- Part 3: Cables for Rated Voltage of 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 is Part 4 of GB/T 12706.
This Part replaced GB/T 12706.4-2008 Power Cables with Extruded Insulation and Their
Accessories for Rated Voltages from 6kV (Um = 7.2kV) [Translator Note: here it should be 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).
Compared with GB/T 12706.4-2008, this Part made the following major technical changes
besides the editorial modifications:
--- Added description and test requirements for internally tapered plug-in type separatable
connectors (see 3.11 and Clause 8 of this Edition);
--- Add the labeling of applicable standards for connecting hardware (see 6.1.2 of this
Edition);
--- Add the labeling of terminal box contents (see 6.1.3 of this Edition);
--- Add the content of the conductor cross-section coverage of separatable connectors in the
approved scope (see Clause 7 of this Edition);
--- Add outdoor terminal immersion test (see Table 2 of this Edition);
--- Modify the axial force data of the operating ring test in the test procedure for screened
dead-break connectors (see Table 5 of this Edition; Table 7 of the 2008 Edition);
--- Add the constant voltage load cycle test in air for additional tests of minimum and
maximum conductor cross-sections (see Table 9 of this Edition);
--- Modify the number of constant voltage load cycles in the additional tests for approval of
different types of cable insulation shields and from round conductors to formed
conductors (see Table 10 of this Edition; Table 11 of the 2008 Edition);
--- Add moisture test for unscreened dead-break connectors (see Table 13 of this Edition).
This Part used redrafting method to modify and adopt IEC 60502-4:2010 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).
Compared with IEC 60502-4:2010, this Part mainly made the structural changes as follows:
--- According to the requirements of GB/T 1.1-2009, the tables are numbered in the order in
which they are mentioned. Starting from Table 2, the correspondence between the tables
in this Part and the IEC 60502-4:2010 tables is that Table 2 corresponds to Table 5; Table
3 corresponds Table 6; Table 4 correspond to Table 7; Table 5 corresponds to Table 8;
Table 6 corresponds to Table 9; Table 7 corresponds to Table 10; Table 8 corresponds to
Table 2; Table 9 corresponds to Table 11; Table 10 corresponds to Table 12, and Table 11
corresponds to Table 3; Table 12 corresponds to Table 4; Table 13 corresponds to Table
13; and Table 14 corresponds to Table 14;
--- Add Subclause 7.9.
Compared with IEC 60502-4:2010, the major technical differences and their causes between
this Part and IEC 60502-2:2010 are as follows:
--- Regarding normative references, this Part has been adjusted with technical differences to
adapt to China's technical conditions. The adjustments are reflected in Clause 2
"Normative References". The specific adjustments are as follows:
● Add reference to GB/T 2900.10 (see Clause 3);
● Replace IEC 60502-2:2005 with GB/T 12706.2, which is modified to adopt
international standards (see Clause 1, Clause 5 and 6.1.1);
● Add reference to GB/T 12706.3 (see Clause 1, 5.1, 5.2 and 6.1.1);
● Replace IEC 61442:2005 with GB/T 18889-2002, which is modified to adopt
international standards (see Tables 1 ~ 10 and Table 12);
● Replace IEC 60183 with JB/T 8996, which has a non-equivalent degree of
consistency with international standards (see 5.1);
● Delete IEC 61238-1.
--- In order to adapt to China's technical requirements, add the 35kV voltage level (see
Clause 1);
--- In order to adapt to China's technical requirements, add the description and test
requirements for internally tapered plug-in type separable connectors (see 3.11 and
Clause 8);
--- Delete the term "wide range attachment terms" (see Clause 3);
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 requirements for type test of accessories for extruded
insulated power cables with rated voltages from 3.6/6kV (7.2kV) to 26/35kV (40.5kV) and
meet the requirements of GB/T 12706.2 or GB/T 12706.3.
This Part applies to accessories for extruded insulated power cables with rated voltages from
3.6/6kV (7.2kV) to 26/35kV (40.5kV).
This Part does not apply to cable accessories used under special conditions, such as overhead
cables, submarine cables or shipboard cables or accessories for hazardous environments
(explosive atmospheres, fire-resistant cables, seismic conditions).
2 Normative References
The following documents are essential to the application of this Document. For the dated
documents, only the versions with the dates indicated are applicable to this Document; for the
undated documents, only the latest version (including all the amendments) is applicable to this
Document.
GB/T 2900.10 Electrotechnical Vocabulary – Electric Cables [GB/T 2900.10-2013, IEC
60050(461):2008, IDT]
GB/T 12706.2 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 2: Cables for rated
voltages from 6 kV (Um =7.2 kV) up to 30 kV (Um =36 kV) (GB/T 12706.2-2020, IEC
60502-2:2014, MOD)
GB/T 12706.3 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
voltages of 35kV (Um =40.5kV)
GB/T 18889-2002 Electric cables-test methods for accessories for power cables with rated
the number of samples in Figure 3.
7.4 Approval is dependent on the cable insulation tested as detailed in Table 11.
7.5 The additional tests specified in Table 10 shall be carried out to achieve extension of
approval for different types of cable insulation semiconducting screens. Stop ends shall be
tested as in Table 4 using half the number of samples in Figure 3.
7.6 Approval obtained by testing on a non-longitudinally water-blocked type of cable shall be
extended to a cable with means of longitudinal water-blocking in the metallic screen area but
otherwise of the same design. The converse shall not apply.
7.7 Tests performed on three-core accessories shall be deemed to cover single-core accessories
of the same design. The converse shall not apply.
7.8 Compliance of an accessory tested for a specified U0 shall extend to operation of the
accessory at a lower U0 provided that the radial electrical stress at the insulation screen of the
cable of lower U0 is not greater than that of the test cable. In addition, for separable connectors,
the screen fault current initiation test shall be carried out at the lowest U0 for which compliance
is required.
7.9 The products covered by this Part are approved based on GB/T 12706.4-2008 and/or after
satisfactory operating characteristics verification. This Part does not negate existing approvals,
but products approved in accordance with GB/T 12706.4-2008 or specifications cannot obtain
approval in this Part unless special tests are conducted on them. If an accessory passes the test,
these tests do not need to be repeated unless there are changes in materials, design or
manufacturing processes that may affect operating characteristics.
8 Test Sequences
Tests applicable to various accessories shall be carried out in accordance with the corresponding
program tables and diagrams listed in Table 12.
For terminations and joints, if the test procedures and requirements are the same, they can be
tested together.
The test procedures and requirements for internally tapered plug-in type separable connectors
can be carried out according to the provisions of Table 6 (moisture removal test).
The test procedures and requirements for screened bolted-type separable connectors can be
carried out in accordance with Table 5 (except for plug-in and pull-out tests, operating ring tests,
operating force tests and capacitance test point tests).
The test procedures and requirements for unscreened bolted-type separable connectors can be
carried out in accordance with Table 6 (except plug-in and pull-out test).
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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