GB/T 31489.1-2015 PDF English
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GB/T 31489.1-2015: D.C. extruded cable systems for power transmission at a rated voltage up to and including 500 kV - Part 1: Test methods and requirements
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
D.C. extruded cable systems for power transmission at a
rated voltage up to and including 500 kV - Part 1.Test
methods and requirements
Issued on. MAY 15, 2015
Implemented on. DECEMBER 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 6
4 Test voltage, cable design thermal parameters and test conditions... 8
5 Development test... 12
6 Type test... 12
7 Prequalification test... 32
8 Routine test... 35
9 Sample test... 37
10 Tests after installation... 41
Annex A (normative) Test method for electrical conductivity of cable insulation... 42
Annex B (normative) Test method for cable insulation space charge... 44
Foreword
GB/T 31489 "D.C. extruded cable systems for power transmission at a rated voltage up
to and including 500 kV" is divided into the following 4 parts.
- Part 1.Test methods and requirements;
- Part 2.D.C. land cables;
- Part 3.D.C. submarine cables;
- Part 4.Accessories for D.C. cables.
This Part is Part 1 of GB/T 31489.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part was proposed by China Electrical Equipment Industry Association.
This Part shall be under the jurisdiction of National Technical Committee on Wire and
Cable of Standardization Administration of China (SAC/TC 213).
The drafting organizations of this Part. Shanghai Electric Cable Research Institute,
Qingdao Hanhe Cable Co., Ltd., Guangdong Power Grid Corporation Electric Power
Research Institute, Zhongtian Technology Submarine Cable Co., Ltd., Ningbo
Dongfang Cable Co., Ltd., Ningbo Ball Crown Cable Co., Ltd., Jiangsu Hengtong High
Voltage Cable Co., Ltd., Shanghai Sanyuan Cable Accessories Co., Ltd., Shanghai
Huapu Cable Co., Ltd., Far East Cable Co., Ltd., Wuxi Jiangnan Cable Co., Ltd., TBEA
Shandong Luneng Taishan Cable Co., Ltd., Chongqing Taishan Cable Co., Ltd.,
Zhejiang Chenguang Cable Co., Ltd., Huizhou Jinlong Yu Extra High Voltage Cable
Co., Ltd., Shandong Hualing Cable Co., Ltd., Anhui Hualing Cable Group Co., Ltd.,
Sichuan Star Cable Co., Ltd., Anhui Huayu Cable Group Co., Ltd., Jidong Putian Cable
Co., Ltd., Guangdong Jixian Cable Accessories Co., Ltd., Changyuan Power
Technology Co., Ltd., Borouge/Borealis, Shanghai Kaibo Special Cable Material
Factory Co., Ltd., Zhejiang Wanma Polymer Materials Co., Ltd., Shanghai Jiaotong
University, Shanghai Electric Power Company, China Southern Power Grid Scientific
Research Institute Co., Ltd., Zhejiang Electric Power Company Electric Power
Research Institute, National Wire and Cable Quality Supervision and Inspection Center.
Main drafters of this Part. Zhu Yonghua, Wu Changshun, Xu Xiaogang, Chen Peiyun,
Hu Ming, Ye Xinhong, Wen Shanghai, Pan Wenlin, Xu Cao, Zhou Yan, Wang Chuanbin,
Wu Lifang, Xu Yumin, Yang Fujun, Yue Zhenguo, Lu Jicai, Pan Maolong, Li Wansong,
Wu Qingzhen, Deng Jiuwang, Li Bin, Long Liying, Wang Jinming, Sun Mojun, Xiang
Jian, Chen Wenqing, Yin Yi, Zhang Yu, Zhao Linjie, Liu Li, Yang Juanjuan, He Wei,
Yuan Changjun, Fan Yujun, Li Ji, Yang Lizhi, Jia Xin.
D.C. extruded cable systems for power transmission at a
rated voltage up to and including 500 kV - Part 1.Test
methods and requirements
1 Scope
This Part of GB/T 31489 specifies the test methods and requirements for D.C. extruded
cable systems for power transmission at a rated voltage up to and including 500 kV
(including DC land cables, DC submarine cables and their accessories).
This Part applies to XLPE insulated DC power cables of 500 kV and below installed on
land and on the seabed. It also applies to land cable accessories such as connectors and
terminals for land cables, as well as submarine cable's factory joints (soft joints), repair
joints, transition joints and terminals between submarine DC cables and land DC cables,
and other submarine cable accessories.
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 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 - Tests for determining the
mechanical properties
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 line commutated converters (LCC)
The voltage polarity of the cable system changes when the power flow is reversed. It is
used for high-voltage direct current transmission system.
3.2 voltage source converters (VSC)
The voltage polarity of the cable system does not change when the power flow is
reversed. It is used for high-voltage direct current transmission system.
3.3 transmission cable
HVDC cables in unipolar or bipolar HVDC transmission systems.
3.4 return cable
LV/MV DC cables for return flow in unipolar HVDC transmission systems. It can be
used for full-line connection between converter stations. It can also be used for partial
connection between converter stations and electrode stations.
4 Test voltage, cable design thermal parameters and test conditions
4.1 Test voltage
See Table 1 for the test voltage.
4.2 Cable design thermal parameters
Tc,max - the maximum operating temperature of the cable conductor, which is declared
by the manufacturer.
4.3 Test conditions
4.3.1 Heating method
a) VSC, positive impact of same polarity operation b) LCC or VSC, negative impact of reverse polarity operation
c) VSC, negative impact of same polarity operation d) LCC or VSC, positive impact of reverse polarity operation
e) LCC or VSC, positive impact of lightning f) LCC or VSC, negative impact of lightning
Use direct current or alternating current to heat the conductor, with help of external
insulation or cooling means. Verify the actual temperature difference ΔT in the
insulation and the conductor temperature Tc in the test.
4.3.3 High load (HL)
High load includes a continuous heating phase. During the first 8h of the heating phase,
the conductor temperature shall not be lower than Tc,max and the temperature difference
within the insulation shall not be lower than ΔTmax, which shall be maintained until the
end of the high load test.
4.3.4 Zero load (ZL)
Heating is not carried out.
4.3.5 Ambient temperature
Unless otherwise specified in the test, the test shall be carried out at ambient
temperature (20 ± 15)°C.
4.3.6 Polarity reversal test (PR)
The polarity reversal test starts with positive polarity voltage first. The voltage polarity
is reversed 3 times every 24h load cycle (equal distribution). One of the reversals shall
coincide with the stop time of the load current in the 24h load cycle. It is recommended
that the time for polarity reversal shall not exceed 2min.
4.3.7 Superimposed impulse voltage test (S/IMP)
Before the first impulse voltage is applied to the test object, the test object shall be
heated until the temperature of the conductor is not lower than Tc,max and the internal
temperature difference of the insulation is not lower than ΔTmax for at least 10 h. And
the test object has been subjected to U0 (corresponding polarity) for at least 10 h.
Maintain DC voltage. Superimpose the impulse voltage on the test object for 10
5 Development test
The manufacturer shall complete all analytical and development tests prior to
prequalification test. A development test shall at least include the following.
6 Type test
6.1 Scope of type test approval
Type tests are also valid for other cable systems within the scope of this Standard if the
following conditions are met.
6.2 Test object
All components (cables and accessories) of the cable system shall be type tested. Each
component can be tested in different test loops. These test loops shall contain all
relevant components of the cable system.
6.3 Non-electrical type test
6.3.1 Cable structure inspection
Conductor inspection, insulation and non-metallic sheath thickness, metal sheath
thickness and outer diameter measurement of cables shall be carried out according to
the provisions of 9.1.4, 9.1.7, 9.1.8 and 9.1.9 respectively, which shall comply with the
provisions of relevant product standards.
6.3.3 Mechanical and physical properties of cable's non-metallic sheath
The mechanical and physical properties of the cable's non-metallic sheath shall meet
the requirements in Table 3.
6.3.6 Scraping test of non-metallic outer sheath
For land cable specimens after bending test in 6.4.3.1, the non-metallic outer sheath
shall be subjected to scraping test according to JB/T 10696.6-2007 and GB/T 2952.1-
2008, which shall meet the corresponding requirements.
6.3.7 Corrosion extension test (only applicable to aluminum sleeve)
For land cable specimens after bending test in 6.4.3.1, the aluminum sleeve shall be
subjected to corrosion expansion test according to JB/T 10696.5-2007 and GB/T
2952.1-2008, which shall meet the requirements.
6.3.8 Water penetration test
6.4 Electrical type test of cable system
6.4.1 Inspection of cable insulation thickness for electrical type test
Before the electrical test, the insulation thickness of the cable section used for the test
shall be inspected according to the method specified in GB/T 2951.11-2008, so as to
check whether the insulation thickness exceeds the value declared by the manufacturer.
6.4.2 Summary of electrical type test
See Figure 5 for the electrical type test procedure of the cable system. In addition to
6.4.7, 6.4.8, 6.4.9 and 6.4.10, the rest tests shall be carried out on the same test object.
Figure 5 -- Schematic diagram for electrical type test procedure for cable system
6.4.3 Mechanical pretreatment before electrical type test
7 Prequalification test
7.1 Scope of accreditation
Normally, the prequalification test shall be carried out after the development test is
completed. It can also be agreed upon by both parties. The prequalification test only
needs to be carried out once, unless the material, manufacturing process, structure or
design parameters of the cable system are substantially changed.
7.2 Overview of prequalification test
A cable system with a rated voltage of 80 kV and above shall be subjected to a
prequalification test.
7.3 Test arrangement
Cables and accessories shall be installed according to the installation manual provided
by the manufacturer, including a certain amount and level of auxiliary materials, such
as lubricating oil.
7.4 Long-term voltage test
The minimum test duration for the prequalification test is 360 days. The conductor
temperature and insulation temperature difference of the cable system shall be
controlled at the design level. Design levels of accessories and adjacent cables can be
different.
7.5 Superimposed impulse voltage test
The superimposed impulse voltage test after the long-term voltage test varies with
different projects. The recommended impulse voltage is UP2, O = 1.2U0, UP1 = 2.1U0 (if
applicable).
7.6 Inspection
Inspect anatomical cables and disassembled accessories with normal or corrected vision.
There shall be no signs of deterioration (such as electrical deterioration, leakage,
corrosion or detrimental shrinkage) affecting the proper operation of the cable system.
7.7 Acceptance criteria, retest and test interruption
The criterion for the prequalification test is that the test object does not break down
after all the tests. The test system shall be inspected according to 7.6.
8 Routine test
8.1 Transmission cable
Each delivered length of cable shall withstand negative polarity DC voltage UT between
conductor and shield.
8.2 Cable accessories
8.2.1 Prefabricated joints and terminations
Prefabricated joints are usually used for connection between DC land cables. The
terminal is used for the connection of DC land cables and DC submarine cables. The
main insulation of prefabricated accessories shall be subjected to the DC voltage test
specified in 8.1.
8.2.2 Factory joints for submarine cables
Factory joints are often used for large lengths of submarine cables. There are at least
the following 4 ways to check the quality of factory joint insulation.
8.2.3 Repair joints of submarine cables
For prefabricated submarine cable repair joints, conduct routine tests according to 8.2.1.
For molded submarine cable repair joints, routine tests cannot be carried out. Sample
tests shall be carried out in accordance with 9.4, so as to control the quality level of
repair joints.
8.3 Return cable
Each length of return cable sent shall be subjected to an AC voltage test between the
conductor and the sheath. The test voltage and time shall be agreed upon by the supplier
and the buyer.
9 Sample test
9.1 Transmission cable
9.1.1 Test item
The sample test items for transmission cables are as follows.
9.1.2 Test frequency
Sample tests of items a) ~ g) in 9.1.1 shall be carried out on a sample drawn from the
production batch of cables of the same type and specification. But it shall not exceed
10% of the total number of cables in any contract. Round up to whole number.
9.1.3 Retest
If a specimen taken from any cable fails to pass any of the tests specified in 9.1.1, a
specimen shall be taken from each of the other two cables in the same batch to test the
failed test items. If the two additional test specimens have passed the test, the other
cables in the batch shall be considered to meet the requirements. If one of the additional
test specimens still fails the test, the batch of cables shall be considered as non-
compliant.
9.1.4 Conductor inspection
The conductor structure shall meet the requirements of GB/T 3956-2008.
9.3 Repair joint and terminal
For prefabricated repair joints and terminals that are routinely tested in accordance with
8.2.1, the sample test is no longer applicable. The molded submarine cable repair joints
shall be subjected to sample test according to the provisions in 9.4.
9.4 Field molded joint
Field molded joints cannot be routinely tested. The sample test frequency of molded
joints shall be 1 for every more than 50 joints of the same cable contract. The
recommended test items are as follows.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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