JB/T 6468-1992 Indoor and outdoor wrapping terminals for power cables with rated voltage up to 8.7/10kV
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Indoor and outdoor wrapping terminals for power cables with rated voltages of 8.7/10kV and below
1 Subject content and scope of application
JB6468-92
This standard specifies the product marking and code, technical requirements, test methods, inspection rules and signs, packaging, transportation and storage of indoor and outdoor wrapping terminals for power cables with rated voltages of 8.7/10kV and below. This standard applies to indoor and outdoor self-adhesive rubber tape wrapping terminals for extruded insulated power cables with rated voltages of U./U and 8.7/10kV and below, and the use conditions shall comply with Article 4.1 of GB11033.1. 2 Reference standards
GB2900.10
GB11033
GB5589
GB9327
GB6553
GB1695
GB1692
GB1693
3 Terminology
Electrical terminology Wires and cables
Basic technical requirements for power cable accessories with rated voltage of 26/35kV and below Crimp-type copper and aluminum terminals and connecting tubes for power cable conductors Test methods for cable accessories
Cable conductor Test methods for compression and mechanical connection joints High voltage testing technology Part 2 Test procedure Overhead insulated cables with rated voltage of 10 kV and 35 kV Test methods for assessing the resistance to electrical tracking and erosion of electrical insulating materials for use under severe environmental conditions Determination of tensile properties of vulcanized rubber
Determination of power frequency breakdown strength and withstand voltage of vulcanized rubber Method for determination of insulation resistivity of vulcanized rubber Method for determination of power frequency dielectric constant and dielectric loss tangent of vulcanized rubber Test methods for resistivity of wires and cables, semiconductors, rubber and plastic materials This standard adopts the terms specified in GB 2900.10 and GB 11033.1. 4 Product marking and code
4.1 Code
4.1.1 Classification by series
Indoor terminal series
Outdoor terminal series
4.1.2 Classification by process characteristics
Wrapping type·
4.1.3 Classification by design sequence
First design
Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992, 70
Implemented on January 1, 1993
Second design
(The following are analogous)
4.1. 4 According to voltage level
1.8/3kV and below.
3.6/6, 6/6, 6/10kV..
8.7/10kV...
4.1.5 According to the number of cable cores
Single core·
3 cores·
42 Product representation method
4.2.1 The composition and arrangement order of the product model are as follows: JB6468--92
4.2.2 Example
8.7/10kV 3-core cable outdoor type wrapping terminal, first design. a.
JB6468--92
Cable core number code
Voltage level code
Design sequence code
Process characteristic code
Series code
Indicated as WRB-1-33JB6468-92
b.3.6/6, 6/6 or 6/10kV 3-core cable indoor wrapping terminal, first design. Indicated as NRB1-23JB6468-92
5 Technical requirements
In addition to meeting the requirements of the three types of terminals in GB11033 standard, the wrapping terminal shall also meet the following provisions. 5.1 The insulating tape and semi-conductive tape used in the wrapping terminal shall meet the requirements of Appendix A and Appendix B of this standard, and all terminal parts shall be supplied in full sets.
5.2 The conductor connection fittings shall comply with the relevant provisions of the national standard "Crimp-type copper and aluminum terminals and connecting tubes for power cable conductors". The DC resistance of the copper-aluminum transition terminal shall not be greater than 1.2 times the DC resistance of the aluminum conductor of the same length and cross-section. 5.3 The external insulation material used for outdoor terminals shall be resistant to atmospheric aging, leakage traces and electrical corrosion. 5.4 For the main electrical structural dimensions of the wrap-around terminal using a stress cone type, please refer to Appendix D. The electrical structural dimensions of the wrap-around terminal using a stress control belt or stress control sheet are under consideration. 5.5 Grounding wire
The terminal grounding wire should be made of tinned copper wire, and its cross-section is recommended to be selected according to the requirements of Table 1. 71
35 and below
50-120
150~300
5.6 Electrical performance
Cable main line core section
JB 6468-92
50 and below
70~150
185~300
Line dispersion
According to the installation process instructions provided by the manufacturer, install the various materials and components of the provided cable terminal on the cable end of the corresponding specification with reliable performance and then conduct electrical performance tests. The test items and requirements should comply with the provisions of Table 2 and Table 3. 6 Test methods
6.1 The requirements specified in Article 5.1 shall be tested according to the test methods specified in Appendix A and Appendix B. 6.2 The requirements specified in Article 5.2 shall be tested according to the test methods specified in GB9327.2. 6.3 The atmospheric aging resistance requirements specified in Article 5.3 shall be tested according to the test methods specified in Appendix A of the national standard "Overhead Insulated Cables with Rated Voltages of 10kV and 35kV", and the leakage trace resistance and electrical corrosion resistance requirements shall be tested according to the test methods specified in GB6553. 6.4 The requirements specified in Article 5.3 shall be tested according to the test series and test methods specified in Table 2 or Table 3. Table 2
Test voltage value
Test items
Power voltage test
Dry state 1min
Wet state 1min
Partial discharge test
Constant voltage load cycle test
3 cycles
Partial discharge test
6/6,
(Conductor is heated by current for 5h and cooled for 3h. The highest temperature of the conductor during heating is the allowable working temperature of the cable plus 5℃)
Test method
GB11033.1
Article 5.1
No flashover, no breakdown
Under the specified extinguishing
voltage, the discharge
XLPE, EPR
performance is not more than 20PC|| PVC cable is not more than 40PC. It will be evaluated by subsequent tests. Under the specified extinguishing voltage, the discharge capacity of XLPE and EPR cables is not more than 20PC. PVC cables are not more than 40PC. Test series: Indoor terminals. Outdoor terminals. Test items: Constant voltage load cycle test. 123 cycles. 114 cycles. Load ring test. (without voltage) 9 cycles. Short circuit test. Short circuit thermal stability. Short circuit dynamic stability. Salt spray test. 1000h. t||Humidity test 100h
Impulse voltage test
1.2/50μs
±10 times
DC voltage test
Negative polarity 15mm
Rated voltage test
Partial discharge test
Appearance inspection
Test voltage value
6/6,
JB6468--92
Continued Table 2
Test method
(Conductor is heated by electric current for 5h, cooled for 3h, and the maximum temperature of the conductor during heating is the allowable working temperature of the cable plus 5℃)
(Conductor is heated by electric current for 5h, cooled for 3h, and the maximum temperature of the conductor during heating is the allowable working temperature of the cable plus 5℃, the entire cable terminal sample Should be submerged in water)
(Each sample is short-circuited twice, and the current value should comply with the provisions of Table 1 of GB11033.1)
(Each sample is short-circuited once, and the current is 63kA)4
(All terminal samples need to be inspected for appearance after all tests are passed)
Evaluated by subsequent tests
Evaluated by subsequent tests
In the old consideration
GB311.1 and
GB11033
Article 5.3
GB311.3 and
GB11033.1
Article 5.2
GB11033.1
Article 5.1
Evaluated by subsequent tests
According to GB5589.5 Provisions According to GB5589.6, no breakdown, the positive and negative poles are allowed to flash over - times, but not included in the total number of tests. No flashover, no breakdown. No flashover, no breakdown. Under the specified extinguishing voltage, the discharge capacity of XLEP and EPR cables is not more than 20PC. PVC cables are not more than 40PC. t||No cracks, deformation,
leakage, electric corrosion
Test series
Indoor terminal
Outdoor terminal
Test items
Rated voltage test
Dry state 1min
Wet state 1min
Partial discharge test
Load cycle test
(no voltage)
3 cycles
Partial discharge test
Impulse voltage test
1.2/50 μs
±10 times
DC voltage test
Negative polarity 15min
Rated voltage test
0.6/13.6/6
JB6468~92
Test method
(Conductor is heated by current for 5h and cooled for 3h. The maximum temperature of the conductor during heating is the allowable working temperature of the cable plus 5℃)
GB11033.1
Article 5.1
No flashover, no breakdown
Under the specified extinguishing voltage, the discharge
capacity of XLPE and EPR cables shall not
be greater than 20PC, and that of PVC cables shall not
be greater than 40PC
Evaluated by subsequent tests
Test procedure
Indoor terminal and outdoor terminal
At the specified Under the extinguishing voltage, the discharge quantity of XLPE and EPR cables shall not be greater than 20PC, and that of PVC cables shall not be greater than 40PC. According to Article 5.3 of GB311.3 and GB11033.1, there shall be no breakdown. The positive and negative polarities are allowed to flash over once each, but it shall not be included in the total number of tests. t||GB311.3 and
GB11033.1 No flashover, no breakdown
Article 5.2
GB11033.1
Article 5.1
No flashover, no breakdown
Inspection rules
7.1 Products shall be inspected and qualified by the technical inspection department of the manufacturing unit before leaving the factory. Products leaving the factory shall be accompanied by a product quality inspection certificate. 7.2 Products shall be type tested in accordance with the requirements of Articles 5.1 to 5.5 and Table 2 of Article 5.6. The number of test products and the evaluation method of test results shall be in accordance with the corresponding provisions of the three types of terminals in GB11033. 7.3 Sampling test
7.3.1 During normal production, a sampling test shall be carried out once every 35 years. It shall also be carried out when the user makes a request and the two parties agree. 7.3.2 The products shall be sampled and tested in accordance with the requirements of Articles 5.2 to 5.4 and Table 3 of Article 5.6. The number of samples and the evaluation method of the test results shall be in accordance with the corresponding provisions of the three types of terminals in GB11033. 7.4 Routine test
The products shall be routinely tested in accordance with the requirements of Article 5.1. 8 Marking, packaging, transportation, storage
JB6468—92
8.1 The various strips and main structural components and materials used in the terminal shall be marked with the brand, name, factory name, and date of manufacture, and shall be accompanied by a certificate of conformity or acceptance mark. The materials with a storage period must indicate the date of manufacture and storage period. 8.2 Various strips and materials shall be sealed and packaged separately. Each set of wrapping type terminals shall be packaged in a special packaging box, and the packaging box shall be accompanied by a list of materials and installation process instructions.
8.3 The packaging box should indicate:
Manufacturer name,
Product model, name, product standard number; rated voltage;
Conductor material, cross section and number of cores;
Factory date.
Products should be protected from heavy pressure and violent collision during transportation. 8.4
Product storage places should have fire prevention measures, dry and ventilated, and the storage period should not exceed the storage date of the corresponding supporting materials and accessories. 75
The performance requirements of self-adhesive rubber insulating tape are shown in Table A1. No.
Project name
Tensile strength MPa≥
Magic rate %≥
Project breakdown voltage kV/mm>
Volume resistivity a·cm
Dielectric loss tangent
Dielectric constant
White viscosity
Resistance to thermal stress cracking
Heat resistance
JB6468-92
Appendix A
Performance requirements for self-adhesive rubber insulating tape
(Supplement)|| tt||Performance refers to
no loosening
no cracking
no loosening
no cracking
Note: Type 2 insulating tape is recommended for extruded insulated cable joints and terminals with long-term working temperature of 70℃ and below. Type 3 insulating tape is recommended for extruded insulated cable joints and terminals with long-term working temperature of 9G℃ and below. Appendix B
Performance requirements of self-adhesive rubber semi-conductive tape
(supplement)
Performance requirements of self-adhesive rubber semi-conductive tape are shown in Table B1. Table B1
Item name
Tensile strength MPa≥
Elongation %≥
Volume resistivity
Self-adhesion
Resistance to thermal stress cracking
Heat resistance
Performance index
No loosening
No cracking
130℃
Test method
GB1695
GB1692
GB1693
GB1693
Appendix C of this standard
Appendix C of this standard
Appendix C of this standard
Test method
Appendix ℃ of this standard
Appendix C of this standard
Appendix C of this standard
C1 Preparation of test specimen
JB 6468-92
Appendix C
Test method for heat resistance, self-adhesion and heat stress cracking of self-adhesive rubber tape (supplement)
Cut a 150±10mm long section from the finished tape roll, remove the isolation layer, stretch it by 200%~300%, wrap it in a semi-overlapping manner, and wrap it around a metal rod with a diameter of 10±0.2mm in four layers, with a wrapping length of 50±5mm. C2 Heat resistance test
After placing the test tape at an ambient temperature of 23±2℃ for 4h, prepare 3 samples according to the sample preparation method of C1, and then place the samples in an electric blast drying oven at 100±2℃ (without blasting) and take them out after 168h. If there is no loosening, deformation, cracking, surface bubbles, etc. on the 3 samples, the test is passed, otherwise the test is not passed. C3
Self-adhesion test
Put the sample strip at an ambient temperature of 23±2℃ for 4 hours, and then prepare 3 test pieces according to the C1 test piece preparation method, and then place the test pieces at the same temperature for 24 hours. If none of the 3 test pieces loosen automatically, the test is passed. If one test piece loosens, the test is not passed. C4 Heat stress cracking test
Put the sample strip at an ambient temperature of 23±2℃ for 4 hours, and then prepare 3 test pieces according to the C1 test piece preparation method, and then suspend the test pieces in a drying oven at 130±2℃ with electric heating and blasting, and take them out after 1 hour. If none of the 3 test pieces crack, the test is passed. If one test piece cracks, the test is not passed.
JB646892
Appendix D
Main electrical structural dimensions of wrap-around terminal using stress cone type (reference part)
The structure of wrap-around terminal using stress cone type is shown in Figure D1. D1
1——Terminal:bzxZ.net
5---Self-adhesive rubber cavity insulation tape,
9—Cable semi-conductive layer;
13--—Sealed wrapping layer,
Rain cover;
One screen knocking ring;
Binding copper wire:
Branch gloves:
Cable insulation:
Terminal outer sheath:
Semi-conductive tape:
11-Cable metal shielding layer;
Cable outer sheath:
Metal screen drum layer:
12—Stress cone;
One grounding wire.
Note:①3.6/6kV all-in-one shielded cable does not include stress cone, and the length from the shield to the cable end is not less than the L size in the table.②3.Cables below 6/6kV are not covered with stress tapered cable, nor are they covered with rain cover outdoors. After the cores are separated, the length is determined by the installation position and the allowable bending radius of the cores.
JB6468—92
The main structural dimensions of the wrapping terminal using stress cone type are shown in Table D1. D2
3.6/6,6/6,6/10
Additional instructions:
This standard was proposed and managed by the Shanghai Cable Research Institute of the Ministry of Machinery and Electronics Industry. mm
Outer diameter of cable insulation
This standard was drafted by the Shanghai Cable Research Institute of the Ministry of Machinery and Electronics Industry and the Cable Accessories Professional Committee of the Wire and Cable Association of the China Electrical Equipment Industry Association.
The main drafters of this standard are Ge Guangming, Zhou Mingyang and Wu Meisheng. 79
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