GB/Z 18890.3-2002 Cross-linked polyethylene insulated power cables with rated voltage of 220 kV (Um=252 kV) and their accessories Part 3: Cross-linked polyethylene insulated power cables with rated voltage of 220 kV (Um=252 kV) Accessories
Some standard content:
Ics29.060.20
National standardization guidance technical documents of the People's Republic of China GB/Z18890.1～18890.3-2002
Power cables with cross-linked polyethylene insulation and their accessories for rated voltage 220kV (U=252kV) of220kV(Um=252kV)2002-11-25Promulgated
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2003-06-01Implementation
GB/Z18890.1~18890.32002
IEC62067Introduction
GB/Z18890.1—2002Rated voltage 220kV (U=252kV) cross-linked polyethylene insulated power cables and their accessoriesPart 1: Rated voltage 220 kV (U=252kV) cross-linked polyethylene insulated power cable and its accessories power cable system
1 Scope
2 Reference standards
3 Definition...
4 Voltage marking and materials
5 Cable water blocking measures
6 Cable characteristics
7 Accessory characteristics
8 Test conditions
9 Routine test of main insulation of cables and prefabricated accessories 10 Cable sampling test
11 Accessory sampling test
12 Type test of cable system|| tt||13 Pre-qualification test of cable system
14 Electrical test after installation
Appendix A (Appendix of standard) Numerical rounding
Test methods and requirements
Appendix B (Appendix of standard) Semi-conductive shielding resistivity measurement method Appendix C (Appendix of standard) Water penetration test
Appendix D (Appendix of standard) External protective layer test of direct buried joint 19
Appendix E (Appendix of standard) Test on micropores and impurities in insulation layer and micropores and protrusions at the interface between semi-conductive shielding layer and insulation layer...21
GB/Z18890.22002 Cross-linked polyethylene insulated power cables with rated voltage of 220 kV (U=252 kV) and their accessories Part 2: Cross-linked polyethylene insulated power cables with rated voltage of 220 kV (U=252 kV) 1 Scope
2 Reference standards
3 Definition
4 Cable characteristics
5 Cable models and naming
6 Materials
7 Technical requirements·
8 Inspection of finished cables
9 Marking of finished cables
TTY KAONT KAca
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GB/Z18890.1~18890.32002
10 Acceptance rules
11 Packaging, transportation and storage
12 Electrical test after installation
Appendix A (suggestive appendix) Cable use environment Appendix B (suggestive appendix) Insulating material and semi-conductive material performance GB/Z18890.3-2002 Rated voltage 220kV (U=252kV) cross-linked polyethylene insulated power cable and its accessories 29
Part 3: Rated voltage 220kV (U=252kV) cross-linked polyethylene insulated power cable accessories 1 Scope
2 Reference standards
3 Definition
4 Accessory characteristics
5 Accessory model and naming
6 Technical requirements
7 Appendix Piece inspection
8 Test conditions
9 Routine test of accessories
10 Sampling test of accessories
11 Type test of accessories
12 Cable component system and pre-qualification test of accessories13 Product marking
14 Acceptance rules
15 Packaging, transportation and storage
Appendix A (Suggestive appendix)
Appendix B (Suggestive appendix)
Appendix C (Suggestive appendix)
Appendix D (Suggestive appendix)
Properties of rubber materials
Properties of epoxy resin cured body
Properties of silicone oil
Accessory installation guidewww.bzxz.net
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GB/Z18890.1~18890.32002
This guiding technical document is formulated in China for the first time. The test requirements of this guidance technical document are equivalent to the first edition of the International Electrotechnical Commission (IEC) standard publication IEC62067 "Power cable systems for cables with extruded insulation and their accessories with rated voltages of 150kV (U=170kV) and above to 50CkV (u=550kV) - Test methods and requirements". The IEC 20th Technical Committee (Cables) drafting the international standard IEC62067 has decided that the content of this publication will remain unchanged until 2005. By that time, this publication will be reconfirmed or abolished or replaced or modified by a revised version.
This guiding technical document is divided into three parts: Part 1 "Rated voltage 220kV (u=252kV) cross-linked polyethylene insulated power cables and their accessories Power cable system-test methods and requirements": Part 2 "Rated voltage 220kV (U=252kV) cross-linked polyethylene insulated power cables": Part 3 "Rated voltage 220kV (U=252kV) cross-linked polyethylene insulated power cable accessories".
Part 1 is equivalent to IEC62067. Its main technical content, writing format and text structure are the same as IEC62067, but the rated voltage range of cable systems applicable to IEC62067 is from 150kV (U=170kV) to 500kV (U=550kV), and the insulation materials of cables include low-density thermoplastic polyethylene (PE), high-density thermoplastic polyethylene (HDPE), ethylene-propylene rubber (EPR) and cross-linked polyethylene (XLPE), while this part is only applicable to power cable systems with cross-linked polyethylene insulated power cables and their accessories rated for 220kV (U=252kV). Therefore, there are some differences between this part and IEC62067. These differences include: 1) The contents of PE, HDPE
and EPR insulation in Table 1, Table 4, Table 5 and Table 7 of IEC62067 have been deleted from Table 1, Table 3, Table 4 and Table 6 of this part respectively, and the title of Table 6 has been changed according to its contents: 2) This part does not include Table 2 of IEC62067, but directly writes the tg requirements for XLPE insulating mixture into Article 12.4.6,
therefore, the numbers of the tables in this part from Table 2 onwards are reduced by 1 compared with the numbers of the corresponding tables in IEC62067: 3) Table 2 and Table D1 of this part only include the contents of Table 3 and Table D1 of IEC62067 applicable to rated voltage 220kV. 4) This part does not include Table 10 of IEC62067, but directly writes the AC test voltage requirements for 220kV cross-linked polyethylene insulated power cables after installation into Article 14.2; 5) According to the provisions of IEC62067, cables and accessory systems with a rated voltage of 220kV do not need to undergo operating impulse voltage tests. Therefore, this part deletes Article 8.4, Item e) of Article 12.4.2 and Article 12.4.8 on operating impulse voltage tests in IEC62067, and adjusts the relevant article numbers and item order: 6) This part In the 12.5 "Non-electrical tests for cable components and finished cable segments", the 12.5.9 "EPR insulation ozone resistance test" and 12.5.11 "HDPE insulation density measurement" in IEC62067, which are not related to XLPE insulation, were deleted, and the 12.5.13 "Insulation layer micropores, impurities and semi-conductive shielding layer and insulation layer interface micropores, protrusions test", 12.5.14 "Outer sheath abrasion test" and 12.5.13 "Insulation layer micropores, impurities and semi-conductive shielding layer and insulation layer interface micropores, protrusions test" were added at the end.1. "Aluminum sheath corrosion extension test" Part 2 and Part 3 respectively specify the model, material, technical requirements, test, acceptance rules, packaging and storage and transportation of 220kV cross-linked polyethylene insulated power cables and accessories under general operating conditions, and non-equivalently adopt IEC62067. Appendices A, B, C, D and E in Part 1 of this guiding technical document are standard appendices: Appendix A and Appendix B in Part 2 are suggestive appendices; Appendix A, B, C and D in Part 3 are suggestive appendices. For the convenience of document preparation, the appendices of this guiding technical document are still marked as standard appendices and suggestive appendices. This guiding technical document is for reference only. Suggestions and opinions on this guiding technical document should be reflected to the standardization administrative department of the State Council.
This guiding technical document is proposed by the China Electrical Equipment Industry Association. This guiding technical document is under the jurisdiction of the National Wire and Cable Standardization Technical Committee. The units that started this guidance technical document are: Shanghai Cable Research Institute, Wuhan High Voltage Research Institute, Shandong Luneng Taishan Cable Co., Ltd., Shanghai Cable Factory, Shenyang Furukawa Cable Co., Ltd., Zhengzhou Cable Factory, Shanghai Sanyuan Cable Accessories Company, Shanghai Cable Transmission and Distribution Company.
The main drafters of this guidance technical document are: Ying Qiliang, Zhao Jiankang, Qiao Xinwei, Hua Liangwei, Jin Guangqi, Xu Hongqi, Wei Dong, Jiang Yun.
GB/Z18890.1~18890.3—2002
IEC62067 Introduction
Due to the significant development of extruded insulated cable systems with voltages above 150kV, the 21st Research Committee of CIGRE established the 21.03 Working Group (WG21.03) in 1990. The scope of work of WG21.03 is to "draft recommended test requirements for electrical type tests, sampling tests and routine tests based on IEC60480 (1988) extended to 400kV and propose pre-qualification tests and (or) development tests as minimum requirements". WG21.03 reported that the extension of IEC60480 to voltage levels above 150kV requires additional consideration due to the following factors.
These cables form the backbone of the transmission system, so reliability is their highest priority; - These cables and their accessories operate with higher electric field strengths than cables of 150kV and below, so their safety margin is smaller for the inherent performance limits of the cable system. - These cables and accessories have a greater insulation thickness than 150kV cables and accessories, and are therefore subject to greater thermal mechanical forces:
- As the system voltage level increases, cable and accessory design and coordination become more difficult. The WG21.03 recommended test requirements were published in (Electra) No. 151 in December 1993 and adopted by IEC in 1995 to draft the standard for extruded insulated cable systems with voltages above 150kV. IEC considered that this new standard should cover the 500kV voltage level, so CI
GRE No. 21 Research Committee established a special working group at its meeting in September 1997 to study the extension of its initial recommended test requirements to the 500kV voltage level. The new recommended test requirements were published inIssue 193, December 2000, and was adopted by IEC to draft this standard. The main difference between the second edition of IEC60480 revised and published in 1999 and the first edition of IEC60480 in 1988 is that CIGRE believes that long-term accelerated aging tests must be carried out in order to prove the long-term operating reliability of the cable system. This test is called a pre-qualification test, which is conducted on a complete system including cables, connectors and terminals to prove the performance of the system. In addition, the 21.09 working group of CIGRE, whose task is to study post-installation testing of high-voltage extruded insulated cables, conducted a pre-qualification test in August 1997.The recommended test requirements were published in the 173rd issue. This recommended test requirement was also adopted when drafting this standard, indicating that among various tests, it is advisable to avoid DC voltage tests on main insulation, because this test is both ineffective and dangerous. On the other hand, DC voltage tests are recommended for outer sheaths. IV
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Guiding technical documents of national standardization of the People's Republic of China Rated voltage 220kV (Um=252kV) cross-linked polyethylene insulated power cables and their accessories
TYKAONTKAca
Part 1: Test methods and requirements for power cable systems for rated voltage of 220kV (U=252 kV) cross-linked polyethylene insulation power cables and their accessories
Partl:Power cable systems-Cableswithcross-linkedpolyethyleneinsulationand theiraccessoriesforratedvoltageof220kV(U=252 kV)
Partl:Powercablesystems-Cableswithcross-linkedpolyethyleneinsulationand theiraccessoriesforrated voltageof220kV(u=252kv)-Testmethodsandrequirements1Scope
This guiding technical document specifies the test methods and requirements for power cable systems of cross-linked polyethylene insulated cables and their accessories for fixed installation with a rated voltage of 220kV (U=252kV).
This test requirement is applicable to single-core cables and their accessories under normal installation and operating conditions, but not to special cables and their accessories, such as submarine cables. For special cables, the tests of this guiding technical document may need to be revised or special test conditions may need to be designed.
2Cited standards
The provisions contained in the following standards constitute the provisions of this guiding technical document through reference in this guiding technical document. When this guiding technical document was published, the versions shown were valid. All standards will be revised, and parties using this guiding technical document should explore the possibility of using the latest versions of the following standards. GB/T2951.1-1997 General test methods for cable insulation and sheath materials Part 1: General test methods Section 1: Thickness and dimensions measurement - Mechanical properties test (idtIEC60811-1-1:1993) GB/T2951.2-1997 General test methods for cable insulation and sheath materials Part 1: General test methods Section 2: Thermal aging test method (idtIEC 60811-1-2:1985) GB/T2951.4-1997 General test methods for cable insulation and sheathing materials Part 1; General test methods Section 4: Low temperature test (idtIEC60811-1-4:1985) GB/T2951.5-1997 General test methods for cable insulation and sheathing materials Part 2: Special test methods for elastomers and composites Section 1: Ozone resistance test - Hot extension test - Mineral leaching Oil test (idt60811-2-1:1986)
GB/T2951.6-1997 General test methods for cable insulation and sheathing materials Part 3: Special test methods for polyvinyl chloride mixtures Section 1: High temperature pressure test
Anti-cracking test (idtIEC60811-3-1:1985) GB/T2951.7-1997 General test methods for cable insulation and sheathing materials Part 3; Special test methods for polyvinyl chloride mixtures Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on November 25, 2002 and implemented on June 1, 2003
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eqvIEC62067:2001
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Method Section 2: Weight Loss Test I
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Thermal Stability Test (idtIEC60 GB/T 2951.81997 General test methods for cable insulation and sheathing materials Part 4: Test methods for polyethylene and polypropylene mixtures Section 1: Environmental stress cracking resistance test Winding test after air heat aging Determination of filler content Melt index measurement method Carbon black and/or mineral content in polyethylene (idtIEC60811-4-1:1985) GB/T 2951.2 7-1994 Test methods for mechanical and physical properties of wires and cables Corrosion extension test GB/T2951.28-1994 Test methods for mechanical and physical properties of wires and cables Sheath scrape test GB/T2952.1-1989 General provisions for cable outer sheath GB/T3048.121994 Test methods for electrical properties of wires and cables Partial discharge test (eqvIEC60885-3:1988) GB/T3048.131992 Test methods for impulse voltage of wires and cables (negIEC60230:1996) GB/T3956.27-1997 Cable conductors (eqvIEC60228:1978) GB/T12706.2-2002 Rated voltage 1kV (Um=1.2kV) to 3.5kV (Um=40.5kV) extruded insulation power cables
and accessories Part 2: Rated voltage 6kV (Um=7.2kV) to 30kV (Um-36kV) cables (nqv IEC60502.2:1997)
GB/T16927.1—1997 High voltage test technology Part 1: General test requirements (eqvIEC60060-1:1989GB/T19380.2—2001 Cable combustion test under flame conditions Part 1: Vertical combustion test method for single insulated wire or cable (idtIEC60332-1:1993)GB/T18890.2— 2002 Cross-linked polyethylene insulated power cables with rated voltage of 220 kV (Um=252 kV) and their accessories Part 2: Cross-linked polyethylene insulated power cables with rated voltage of 220 kV (Um=252 kV) JB/T8996—1999 Guidelines for the selection of high-voltage cables (eqVIEC60183:1984) 3 Definitions This guidance technical document adopts the following definitions. 3.1 Definitions of dimensions (thickness, conductor cross-section, etc.) 3.1.1 Nominal value nominalvalue
Specified value and often used in tables Note: In this guidance technical document, the value usually derived from the nominal value takes into account the specified tolerance, is measured and tested. 3.1.2 Median value
When several values obtained from the test are arranged in ascending (or descending) order, if the number of values is odd, the middle value is the median value: if the number of values is even, the average of the two middle values is the median value. 3.2 Definitions of relevant tests
3.2.1 Routine tests routinetests
A test conducted by the manufacturer on all lengths of finished cables or each prefabricated insulating part of accessories to check whether it meets the specified requirements.
3.2.2 Sampling tests sampletests
A test conducted by the manufacturer on samples of finished cables or on certain parts taken from finished cables at a specified frequency to check whether the cables meet the specified requirements.
3.2.3 Type tests typetests
A test conducted on a cable system of a type included in this guidance technical document before delivery according to general commercial principles to prove that it
has good performance that can meet the expected use conditions. The characteristics of this test are: unless the change
in the material, design or manufacturing process of the cable or accessories may change its characteristics, the test does not need to be repeated after it is done. 3.2.4 Prequalification test prequalification test A test conducted on a cable system of a type included in this guidance technical document before delivery according to general commercial principles to prove that it2
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GB/Z18890.1—2002
Have satisfactory long-term performance.
Unless there are substantial changes in the materials, manufacturing processes, designs and design levels related to the cable system, the pre-qualification test only needs to be carried out once.
Note: Substantial changes are defined as changes that may have an adverse effect on the cable system. If there are changes and it is stated that they do not constitute substantial changes, the supplier shall provide detailed information including test evidence. 3.2.5 Electrical tests after installation Electrical tests after installation Tests used to prove the integrity of the cable system after installation 3.3 Cable system cable system
The cable system consists of cables and accessories installed on the cables. 4 Voltage marking and materials
4.1 Rated voltage
In this guiding technical document, the rated voltage of cables and accessories that comply with U, U and U markings. The meanings of these symbols are given in JB/T8996.
4.2 Cable insulation materials
The cross-linked polyethylene insulation mixtures for cables to which this guidance technical document applies are listed in Table 1. The table also specifies the maximum operating temperature of the conductor of the cable using this insulation mixture
, which is the basis for specifying the test conditions. Table 1 Maximum temperature of conductor of cross-linked polyethylene insulation mixture of cable/
Insulation mixture
Cross-linked polyethylene (XLPE)
4.3 Cable outer sheath materials
Specify the tests for the following four types of outer sheaths: ST, and ST2 based on polyvinyl chloride. ST and ST. based on polyethylene.
Normal operation
Short circuit (maximum time 5s)
The choice of outer sheath type depends on the cable design and the limitations of mechanical and thermal properties during operation. Note: The temperature limits given in GB/T12706.2 do not require the application of this guidance technical document. 5 Cable Water-blocking Measures
When the cable system is installed underground, in a tunnel or in water prone to accumulation, it is recommended that the cable has a radial impermeable barrier. Note: The conditions for radial water-permeable tests are not yet available. By agreement between the purchaser and the manufacturer or by the manufacturer's recommendation, the cable may have a longitudinal water-blocking structure to prevent the need to replace large sections of the cable in the event of damage to the cable in an environment exposed to water. 6 Cable Characteristics
In order to implement and record the tests described in this guidance technical document, the cable should be verified. The following characteristics should be known or stated: 6.1 Rated voltage: %, U and U. values should be given (see 4.1 and 8.4). 6.2 Conductor type, material and nominal cross-sectional area in square millimeters. If the conductor has a longitudinal water-blocking structure, specify the nature of the measures to achieve longitudinal water-blocking performance. If the conductor cross-sectional area does not comply with GB/T3956, the DC resistance of the conductor should be stated. 6.3 Insulation material and nominal thickness (4.2 and 7.2.1 in GB/Z18890.2-2002). 6.4 Manufacturing process of insulation system.
6.5 If there are water-blocking measures at the shield, the nature of the water-blocking measures. 3
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6.6 If there is a metal screen, the material and structure of the metal screen, such as the number of metal wires and the diameter of the single wire. If there is a metal sheath, its material, structure and nominal thickness. 6.7 Material and nominal thickness of the outer sheath.
6.8 Nominal outer diameter of the conductor (d).
6.9 Nominal outer diameter of the finished cable (D).
6.10 Nominal capacitance between the conductor and the metal shield and (or) metal sheath. 7 Characteristics of accessories
In order to implement and record the tests described in this guidance technical document, the accessories should be verified. The following characteristics should be known or stated: 7.1 The following points should be correctly indicated for the conductor connection fittings used in the accessories: Installation process:
Tools, molds and necessary adjustments;
Contact surface treatment, if applicable:
Type, number and other identification marks of the connection fittings. 7.2 The following points should be correctly marked on the accessories to be tested: Manufacturer's name:
Accessory type, number, manufacturing date or date code: Rated voltage (see 6.1 above):
Installation instructions (reference information and date). 8 Test conditions
8.1 Ambient temperature
Unless otherwise specified in detail for special tests, the test should be carried out at an ambient temperature of (20 ± 15) °C. 8.2 Frequency and waveform of power frequency test voltage
The frequency of the power frequency test voltage should be in the range of 49Hz to 61Hz. The waveform should be basically sinusoidal. The voltage value is expressed as an effective value. 8.3 Lightning impulse test voltage waveform
According to GB/T3048.13, the wavefront time of the standard lightning impulse voltage should be 1μs~5μs, and the half-wave peak time should be 40μs~60μs. The test voltage specified in this guiding technical document is a multiple of the rated voltage U. The U. value and test voltage should be specified in Table 2.
Table 2 Test voltage
Rated voltage Equipment maximum determination test voltage 9.3 Voltage test 9.2 and 12.4.512.4.7 Thermal cycle 10.11.12.4.8 and 13.2.4 Lightning
10.11 and 12.4.8
Lightning impulse voltage test
Voltage time
25U.
Partial discharge test loop voltage test electric impulse voltage test post voltage test
The test voltage in this guidance technical document is determined based on the assumption that the cables and accessories are used in the Class A system defined in JB/T8996. 9 Routine tests on the main insulation of cables and prefabricated accessories 9.1 Overview
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GB/Z18890.1—2002
The following tests should be carried out on the main insulation of each manufactured length of cable and each prefabricated accessory to verify whether the main insulation of each cable and each prefabricated accessory meets the requirements.
The order of these test items is determined by the manufacturer. a) Partial discharge test (see 9.2):
b) Voltage test (see 9.3):
c) Cable outer sheath electrical test (see 9.4). Note: The main insulation of prefabricated accessories includes parts that are in direct contact with the cable insulation and are necessary and basic for controlling the electric field distribution in the accessories, such as pre-molded rubber insulation or epoxy insulation. They can be used alone or in combination to become the necessary insulation and shielding of the accessories. 1) Carried out on the main insulation of the prefabricated accessories installed on the cable; 2) The main insulation parts are installed on the accessories specially provided for the test; 3) The test is carried out using a simulated accessory test device so that the electric field strength to which the main insulation parts are subjected reproduces the actual electric field conditions. In the cases of 2) and 3), the test voltage value should be selected so that the electric field strength generated is at least the same as the electric field strength generated on the accessory product when the test voltage specified in 9.2 and 9.3 is applied to the accessory product. 9.2 Partial discharge test
The cable should be subjected to partial discharge test in accordance with GB/T3048.12, and its sensitivity should be better than or equal to 5pC as defined in GB/T3048.12. The test of accessories is carried out according to the same principle. ) The test voltage shall be gradually increased to 222kV (1.75U) and maintained for 10S, then slowly increased to 190kV (1.5U). At 190kV, no discharge shall be detected in the test product. 9.3 Voltage test
The voltage test shall be carried out at room temperature with power frequency AC voltage. TTY KAONT KAca.
Normal operation
Short circuit (maximum time 5s)
The choice of outer sheath type depends on the cable design and the limitations of mechanical and thermal performance during operation. Note: The temperature limits given in GB/T12706.2 do not require the application of this guidance document. 5 Cable water blocking measures
When the cable system is installed underground, in a tunnel or in water prone to accumulation, it is recommended that the cable has a radially impermeable barrier layer. Note: The conditions for radial water penetration test are not yet available. By agreement between the purchaser and the manufacturer or as recommended by the manufacturer, the cable may adopt a longitudinal water blocking structure to avoid the need to replace large sections of cable in the event of damage to the cable in an environment exposed to water. 6 Cable characteristics
In order to implement and record the tests described in this guidance document, the cable should be verified. The following characteristics should be known or stated: 6.1 Rated voltage: %, U and U. values should be given (see 4.1 and 8.4). 6.2 Conductor type, material and nominal cross-sectional area in square millimeters. If the conductor has a longitudinal water-blocking structure, specify the substance of the measures to achieve the longitudinal water-blocking performance. If the conductor cross-sectional area does not comply with GB/T3956, the DC resistance of the conductor should be stated. 6.3 Insulation material and nominal thickness (4.2 and 7.2.1 in GB/Z18890.2-2002). 6.4 Manufacturing process of the insulation system.
6.5 If there are water-blocking measures at the shield, the substance of the water-blocking measures. 3
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6.6 If there is a metal screen, the material and structure of the metal screen, such as the number of metal wires and the single wire diameter. If there is a metal sheath, its material, structure and nominal thickness. 6.7 Material and nominal thickness of the outer sheath.
6.8 Nominal outer diameter of the conductor (d).
6.9 Nominal outer diameter of finished cable (D).
6.10 Nominal capacitance between conductor and metal shield and/or metal sleeve. 7 Accessory characteristics
In order to implement and record the tests described in this guidance technical document, the accessories should be identified. The following characteristics should be confirmed or stated: 7.1 The following points should be correctly indicated for the conductor connection fittings used in the accessories: Installation process:
Tools, dies and necessary adjustments;
Contact surface treatment, if applicable:
Type, number and other identification marks of the connection fittings. 7.2 The following points should be correctly marked on the accessories to be tested: Manufacturer's name:
Accessory type, number, manufacturing date or date code: Rated voltage (see 6.1 above):
Installation instructions (reference information and date). 8 Test conditions
8.1 Ambient temperature
Unless otherwise specified in detail for a special test, the test shall be carried out at an ambient temperature of (20 ± 15)°C. 8.2 Frequency and waveform of the power frequency test voltage
The frequency of the power frequency test voltage shall be in the range of 49Hz to 61Hz. The waveform shall be basically sinusoidal. The voltage value shall be expressed as an effective value. 8.3 Lightning impulse test voltage waveform
According to GB/T3048.13, the wavefront time of the standard lightning impulse voltage shall be 1μs to 5μs, and the half-wave peak time shall be 40μs to 60μs. The test voltage specified in this guiding technical document is a multiple of the rated voltage U. The U. value and test voltage shall be as specified in Table 2.
Table 2 Test voltage
Rated voltage Equipment maximum determination test voltage 9.3 Voltage test 9.2 and 12.4.5 12.4.7 Thermal cycle 10.11.12.4.8 and 13.2.4 Lightning
10.11 and 12.4.8
Lightning impulse voltage test
Voltage time
25U.
Partial discharge test Loop voltage test Electric impulse voltage test Post voltage test
The test voltage in this guidance technical document is determined based on the assumption that the cables and accessories are used in the Class A system defined in JB/T8996. 9 Routine tests on the main insulation of cables and prefabricated accessories 9.1 Overview
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The following tests shall be carried out on the main insulation of each manufactured length of cable and each prefabricated accessory to verify whether the main insulation of each cable and each prefabricated accessory meets the requirements.
The order of these test items shall be arranged by the manufacturer. a) Partial discharge test (see 9.2):
b) Voltage test (see 9.3):
c) Cable outer sheath electrical test (see 9.4). Note: The main insulation of prefabricated accessories includes parts that are in direct contact with the cable insulation and are necessary and basic for controlling the electric field distribution in the accessories, such as pre-molded rubber insulation or epoxy insulation. They can be used alone or in combination to become the necessary insulation and shielding of the accessories. 1) Conducted on the main insulation of prefabricated accessories installed on the cable; 2) Conducted on the main insulation components installed on accessories specially provided for the test; 3) Conducted the test using a simulated accessory test device so that the electric field strength to which the main insulation components are subjected reproduces the actual electric field conditions. In the cases of 2) and 3), the test voltage value shall be selected so that the electric field strength generated is at least the same as the electric field strength generated on the accessory product when the test voltage specified in 9.2 and 9.3 is applied to the accessory product. 9.2 Partial discharge test
The cable shall be subjected to a partial discharge test in accordance with GB/T3048.12, and its sensitivity shall be better than or equal to 5pC as defined in GB/T3048.12. The test of accessories shall be conducted in accordance with the same principle. ) The test voltage shall be gradually increased to 222kV (1.75U) and maintained for 10S, and then slowly increased to 190kV (1.5U). At 190kV, there shall be no detectable discharge on the test product. 9.3 Voltage test
The voltage test shall be conducted at room temperature with power frequency AC voltage. TTY KAONT KAca.
Normal operation
Short circuit (maximum time 5s)
The choice of outer sheath type depends on the cable design and the limitations of mechanical and thermal performance during operation. Note: The temperature limits given in GB/T12706.2 do not require the application of this guidance document. 5 Cable water blocking measures
When the cable system is installed underground, in a tunnel or in water prone to accumulation, it is recommended that the cable has a radially impermeable barrier layer. Note: The conditions for radial water penetration test are not yet available. By agreement between the purchaser and the manufacturer or as recommended by the manufacturer, the cable may adopt a longitudinal water blocking structure to avoid the need to replace large sections of cable in the event of damage to the cable in an environment exposed to water. 6 Cable characteristics
In order to implement and record the tests described in this guidance document, the cable should be verified. The following characteristics should be known or stated: 6.1 Rated voltage: %, U and U. values should be given (see 4.1 and 8.4). 6.2 Conductor type, material and nominal cross-sectional area in square millimeters. If the conductor has a longitudinal water-blocking structure, specify the substance of the measures to achieve the longitudinal water-blocking performance. If the conductor cross-sectional area does not comply with GB/T3956, the DC resistance of the conductor should be stated. 6.3 Insulation material and nominal thickness (4.2 and 7.2.1 in GB/Z18890.2-2002). 6.4 Manufacturing process of the insulation system.
6.5 If there are water-blocking measures at the shield, the substance of the water-blocking measures. 3
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6.6 If there is a metal screen, the material and structure of the metal screen, such as the number of metal wires and the single wire diameter. If there is a metal sheath, its material, structure and nominal thickness. 6.7 Material and nominal thickness of the outer sheath.
6.8 Nominal outer diameter of the conductor (d).
6.9 Nominal outer diameter of finished cable (D).
6.10 Nominal capacitance between conductor and metal shield and/or metal sleeve. 7 Accessory characteristics
In order to implement and record the tests described in this guidance technical document, the accessories should be identified. The following characteristics should be confirmed or stated: 7.1 The following points should be correctly indicated for the conductor connection fittings used in the accessories: Installation process:
Tools, dies and necessary adjustments;
Contact surface treatment, if applicable:
Type, number and other identification marks of the connection fittings. 7.2 The following points should be correctly marked on the accessories to be tested: Manufacturer's name:
Accessory type, number, manufacturing date or date code: Rated voltage (see 6.1 above):
Installation instructions (reference information and date). 8 Test conditions
8.1 Ambient temperature
Unless otherwise specified in detail for a special test, the test shall be carried out at an ambient temperature of (20 ± 15)°C. 8.2 Frequency and waveform of the power frequency test voltage
The frequency of the power frequency test voltage shall be in the range of 49Hz to 61Hz. The waveform shall be basically sinusoidal. The voltage value shall be expressed as an effective value. 8.3 Lightning impulse test voltage waveform
According to GB/T3048.13, the wavefront time of the standard lightning impulse voltage shall be 1μs to 5μs, and the half-wave peak time shall be 40μs to 60μs. The test voltage specified in this guiding technical document is a multiple of the rated voltage U. The U. value and test voltage shall be as specified in Table 2.
Table 2 Test voltage
Rated voltage Equipment maximum determination test voltage 9.3 Voltage test 9.2 and 12.4.5 12.4.7 Thermal cycle 10.11.12.4.8 and 13.2.4 Lightning
10.11 and 12.4.8
Lightning impulse voltage test
Voltage time
25U.
Partial discharge test Loop voltage test Electric impulse voltage test Post voltage test
The test voltage in this guidance technical document is determined based on the assumption that the cables and accessories are used in the Class A system defined in JB/T8996. 9 Routine tests on the main insulation of cables and prefabricated accessories 9.1 Overview
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GB/Z18890.1—2002
The following tests shall be carried out on the main insulation of each manufactured length of cable and each prefabricated accessory to verify whether the main insulation of each cable and each prefabricated accessory meets the requirements.
The order of these test items shall be arranged by the manufacturer. a) Partial discharge test (see 9.2):
b) Voltage test (see 9.3):
c) Cable outer sheath electrical test (see 9.4). Note: The main insulation of prefabricated accessories includes parts that are in direct contact with the cable insulation and are necessary and basic for controlling the electric field distribution in the accessories, such as pre-molded rubber insulation or epoxy insulation. They can be used alone or in combination to become the necessary insulation and shielding of the accessories. 1) Conducted on the main insulation of prefabricated accessories installed on the cable; 2) Conducted on the main insulation components installed on accessories specially provided for the test; 3) Conducted the test using a simulated accessory test device so that the electric field strength to which the main insulation components are subjected reproduces the actual electric field conditions. In the cases of 2) and 3), the test voltage value shall be selected so that the electric field strength generated is at least the same as the electric field strength generated on the accessory product when the test voltage specified in 9.2 and 9.3 is applied to the accessory product. 9.2 Partial discharge test
The cable shall be subjected to a partial discharge test in accordance with GB/T3048.12, and its sensitivity shall be better than or equal to 5pC as defined in GB/T3048.12. The test of accessories shall be conducted in accordance with the same principle. ) The test voltage shall be gradually increased to 222kV (1.75U) and maintained for 10S, and then slowly increased to 190kV (1.5U). At 190kV, there shall be no detectable discharge on the test product. 9.3 Voltage test
The voltage test shall be conducted at room temperature with power frequency AC voltage. TTY KAONT KAca13. The wavefront time of the standard lightning impulse voltage should be 1μs to 5μs, and the half-wave peak time should be 40μs to 60μs. The test voltage specified in this guidance technical document is a multiple of the rated voltage U. The U. value and test voltage should be specified in Table 2.
Table 2 Test voltage
Rated voltage Equipment maximum determination test voltage 9.3 Voltage test 9.2 and 12.4.512.4.7 Thermal cycle 10.11.12.4.8 and 13.2.4 Lightning
10.11 and 12.4.8
Lightning impulse voltage test
Voltage time
25U.
Partial discharge test loop voltage test electric impulse voltage test post voltage test
The test voltage in this guidance technical document is determined based on the assumption that the cable and accessories are used in the Class A system defined in JB/T8996. 9 Routine tests on the main insulation of cables and prefabricated accessories 9.1 Overview
Previous page
Next page
GB/Z18890.1—2002
The following tests shall be carried out on the main insulation of each manufactured length of cable and each prefabricated accessory to verify whether the main insulation of each cable and each prefabricated accessory meets the requirements.
The order of these test items shall be arranged by the manufacturer. a) Partial discharge test (see 9.2):
b) Voltage test (see 9.3):
c) Cable outer sheath electrical test (see 9.4). Note: The main insulation of prefabricated accessories includes parts that are in direct contact with the cable insulation and are necessary and basic for controlling the electric field distribution in the accessories, such as pre-molded rubber insulation or epoxy insulation. They can be used alone or in combination to become the necessary insulation and shielding of the accessories. 1) Conducted on the main insulation of prefabricated accessories installed on the cable; 2) Conducted on the main insulation components installed on accessories specially provided for the test; 3) Conducted the test using a simulated accessory test device so that the electric field strength to which the main insulation components are subjected reproduces the actual electric field conditions. In the cases of 2) and 3), the test voltage value shall be selected so that the electric field strength generated is at least the same as the electric field strength generated on the accessory product when the test voltage specified in 9.2 and 9.3 is applied to the accessory product. 9.2 Partial discharge test
The cable shall be subjected to a partial discharge test in accordance with GB/T3048.12, and its sensitivity shall be better than or equal to 5pC as defined in GB/T3048.12. The test of accessories shall be conducted in accordance with the same principle. ) The test voltage shall be gradually increased to 222kV (1.75U) and maintained for 10S, and then slowly increased to 190kV (1.5U). At 190kV, there shall be no detectable discharge on the test product. 9.3 Voltage test
The voltage test shall be conducted at room temperature with power frequency AC voltage. TTY KAONT KAca13. The wavefront time of the standard lightning impulse voltage should be 1μs to 5μs, and the half-wave peak time should be 40μs to 60μs. The test voltage specified in this guidance technical document is a multiple of the rated voltage U. The U. value and test voltage should be specified in Table 2.
Table 2 Test voltage
Rated voltage Equipment maximum determination test voltage 9.3 Voltage test 9.2 and 12.4.512.4.7 Thermal cycle 10.11.12.4.8 and 13.2.4 Lightning
10.11 and 12.4.8
Lightning impulse voltage test
Voltage time
25U.
Partial discharge test loop voltage test electric impulse voltage test post voltage test
The test voltage in this guidance technical document is determined based on the assumption that the cable and accessories are used in the Class A system defined in JB/T8996. 9 Routine tests on the main insulation of cables and prefabricated accessories 9.1 Overview
Previous page
Next page
GB/Z18890.1—2002
The following tests shall be carried out on the main insulation of each manufactured length of cable and each prefabricated accessory to verify whether the main insulation of each cable and each prefabricated accessory meets the requirements.
The order of these test items shall be arranged by the manufacturer. a) Partial discharge test (see 9.2):
b) Voltage test (see 9.3):
c) Cable outer sheath electrical test (see 9.4). Note: The main insulation of prefabricated accessories includes parts that are in direct contact with the cable insulation and are necessary and basic for controlling the electric field distribution in the accessories, such as pre-molded rubber insulation or epoxy insulation. They can be used alone or in combination to become the necessary insulation and shielding of the accessories. 1) Conducted on the main insulation of prefabricated accessories installed on the cable; 2) Conducted on the main insulation components installed on accessories specially provided for the test; 3) Conducted the test using a simulated accessory test device so that the electric field strength to which the main insulation components are subjected reproduces the actual electric field conditions. In the cases of 2) and 3), the test voltage value shall be selected so that the electric field strength generated is at least the same as the electric field strength generated on the accessory product when the test voltage specified in 9.2 and 9.3 is applied to the accessory product. 9.2 Partial discharge test
The cable shall be subjected to a partial discharge test in accordance with GB/T3048.12, and its sensitivity shall be better than or equal to 5pC as defined in GB/T3048.12. The test of accessories shall be conducted in accordance with the same principle. ) The test voltage shall be gradually increased to 222kV (1.75U) and maintained for 10S, and then slowly increased to 190kV (1.5U). At 190kV, there shall be no detectable discharge on the test product. 9.3 Voltage test
The voltage test shall be conducted at room temperature with power frequency AC voltage. TTY KAONT KAca
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