GB/T 12706.4-2020Power 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) (English PDF)

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);

--- 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);

--- In order to adapt to China's technical requirements, add the description of "6/6kV,

8.7/10kV, 21/35kV, 26/35kV" (see Table 14).

This Part also made the following editorial modifications.

--- In order to adapt to China's technical standard system, change the standard name into

Power Cables with Extruded Insulation and Their Accessories for Rated Voltages from

6kV (Um = 7.2kV) 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).

--- Add the Bibliography; list the non-normative reference GB/T 9327 into the Bibliography.

This Part was proposed by China Electrical Equipment Industry Association.

This Part shall be under the jurisdiction of National Technical Committee on Wire and Cables

of Standardization Administration of China (SAC/TC 213).

Drafting organizations of this Part. Shanghai Electric Cable Research Institute Co., Ltd.;

Shanghai National Center of Testing and Inspection for Electric Cable and Wire Co., Ltd.;

China Electric Power Research Institute Co., Ltd.; Shanghai Sanyuan Cable Accessories Co.,

Ltd.; Long Cable Technology Group Co., Ltd.; 3M China Limited; Changyuan Electric

Technology Co., Ltd.; Shanghai Yongjin Electric Technology Co., Ltd.; Jiangsu Zhongtian

Technology Cable Accessories Co., Ltd.; Jiangsu Yucheng YEGE Electric Equipment Co., Ltd.;

and ABB (Beijing) Hight Voltage Switchgear Co., Ltd.

Chief drafting staffs of this Part. Xia Junfeng, Xu Xiaofeng, Li Chuang, Yan Mengkun, Xu Cao,

Guo Changchun, Zhuang Meng, Wang Jinming, Du Chenglong, Tian Zhengbing, Tang Zhihui,

Fu Yazhou, Zhang Rong, Zhang Dapeng, Xiao Jingcheng, and Du Qing.

The historical editions replaced by this Part are as follows.

--- GB/T 12706.4-2002, 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)

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.

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.

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in GB/T 2900.10 and the

following apply.

Accessory making a connection between two cables to form a continuous circuit.

4 Type of Accessory

The accessories covered by this Part are listed below.

5 Voltage Designations and Maximum Conductor Temperatures

The accessories shall be applicable to the maximum conductor temperature during normal

operation of the cable and the maximum conductor temperature during short circuit specified

in GB/T 12706.2 and GB/T 12706.3.

6 Assembly of Accessories to be Tested

Where terminations or separable connectors are to be tested, the connection between either

lugs or bushings shall have the same electrical cross-sectional area as that of the cable conductor.

7 Range of Approval

For separable connectors, compliance for one type of accessory for the range of cable conductor

cross-sections given in Table 1 shall be obtained by successfully completing all the appropriate

tests of Table 5 to 7 on the cross-section specified in Table 8.

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.

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).

9 Test Results

If an accessory fails to meet the requirements due to either installation or test procedure errors,

the test shall be declared void without discrediting the accessories.

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