JB/T 6464-1992 Straight-through wrap-around connectors for power cables with rated voltages up to and including 26/35 kV
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Straight-through wrapping joints for power cables with rated voltages of 26/35kV and below
1 Subject content and scope of application
JB6464-92
This standard specifies the product marking and code, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of straight-through wrapping joints for power cables with rated voltages of 26/35kV and below. This standard applies to self-adhesive rubber tape straight-through wrapping cable joints for extruded insulated power cables with rated voltages of U./U of 26/35kV and below, and the use conditions shall comply with Article 4.1 of GB11033.1. 2 Reference standards
GB2900.10
GB11033
GB5589
GB9327
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 Test methods for connecting pipes and cable accessories
Test methods for compression and mechanical connection joints of cable conductors High voltage testing technology Part 2 Test procedure Determination of tensile properties of vulcanized rubber
Determination method of industrial breakdown strength and withstand voltage of vulcanized rubber Determination method of insulation resistivity of vulcanized rubber Determination method of power frequency dielectric constant and dielectric loss tangent of vulcanized rubber Test method for resistivity of wires and cables, semiconductors, rubber and plastic materials This standard adopts the terms specified in GB2900.10 and GB11033.1. 4 Product marking and code
4.1 Code
4.1.1 According to series
Straight-through connector series
4.1.2 According to process characteristics
Wrap-around type.
4.1.3 According to the order of design
First design
Second design.
(The following is analogous)
4.1.4 According to voltage level
Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992. RB
Implemented on January 1, 1993||tt ||1.8/3kV and below
3.6/6, 6/6, 6/10kV
8.7/10kV..
12/20kV
21/35, 26/35kV..
4.1.5 According to the number of cable cores
4.2 Product representation method
4.2.1 The composition and arrangement order of the product models are as follows: 4.2.2 Example
IB646492
8.7/10kV3-core cable straight-through wrapping joint, second design. Expressed as JRB--233JB6464-92
Technical requirements
JB646492
Cable core number code
Voltage level code
II Design sequence code
Process characteristic code
Series code
In addition to meeting the requirements of GB11033 standard, the straight-through wrapping type joint shall also meet the following provisions. 5.1 The insulating strip and semi-conductive strip used in the straight-through wrapping type joint shall meet the requirements of Appendix A and Appendix B of this standard. The joint shall be fully supplied.
5.2 The conductor connection fittings shall meet the corresponding provisions in the national standard "Crimp-type copper and aluminum terminal blocks and connecting tubes for power cable conductors". The DC resistance of the steel-aluminum transition pipe shall not be greater than 1.2 times the DC resistance of the aluminum conductor with the same length and the same cutting surface. 5.3 For the main electrical structural dimensions of the wrap-around joint using the stress cone type, please refer to Appendix D. The main electrical structural dimensions of the wrap-around joint using the stress control belt or stress control sheet are under consideration. 5.4 Bridge wire
Joint bridge wire should use tinned copper wire, and its cross section is recommended to be selected according to Table 1 38
35 and below
50~120
150～300
5.5 Protection box
Main cable core number
JB 6464—92
50 and below
70~150
185~300
When the user requires, the corresponding mechanical protection box should be provided. 5.6 Electrical performance
Wire cross section
In accordance with the installation process instructions provided by the manufacturer, install the various materials and components of the provided cable connector on the cable of corresponding specifications with reliable performance for electrical performance test. The test items and requirements shall comply with the provisions of Table 2 and Table 3. Test method
The requirements specified in Article 5.1 shall be tested in accordance with the test methods specified in Appendix A and Appendix B. 6.2
The requirements specified in Article 5.2 shall be tested in accordance with the test methods specified in GB9327.2. 6.3
The requirements specified in Article 5.3 shall be tested in accordance with the test series and test methods specified in Table 2 or Table 3. Table 2
Test voltage value
Test items
Rated voltage
Partial discharge
Constant voltage load
Cyclic test
3 cycles
Partial discharge
0.6/13.6/6
6/6、
8.7/1012/2018/3021/3526/35
(The 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 electric contraction Temperature plus 5℃)
Test method
GB11033.1
Article 5.1
No breakdown
Under the specified extinguishing voltage
, the discharge capacity of XLPE,
EPR cable 3.6/6kV
~18/36kV is not more than
20PC, 21/35kV~
26/35kV is not more than
10
PC, PVC cable is not more than
40 PC
Assessed by subsequent tests
under the specified extinguishing voltage
, the discharge capacity of XLPE,
EPR cable 3.6/6kV
～18/30kV is not more than
20PC,21/35kV~
26/35kV is not more than
10
PC,PVC cable is not more than
40 PC
Test series
Test items
Constant voltage negative voltage
Cyclic test
60 cycles
In air
63 cycles
In water
Short circuit test
Short circuit thermal stability
Short circuit dynamic stability
Impact voltage
1.2/50μs
±10 times
DC withstand voltage
Negative polarity
Power frequency voltage test
10Partial discharge test
11Appearance inspection
0.6/13.6/6
JB6464-92
Continued Table 2
Test voltage value
6/6、
8.7/1012/20|18/3021/3526/35
(The 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℃)
(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)60
(All cable joints need to be inspected for appearance after all tests are passed)Test method
In the test,
GB311.3 and
GB 11033.1
Article 5.3
GB311.3 and
GB11033.1
Article 5.2
GB11033.1
Article 5.1
Assessed by subsequent tests
Assessed by subsequent tests
No breakdown
No breakdown
No breakdown
Under the specified extinguishing voltage
, the discharge capacity of XLPE,
EPR cable 3.6/6kV
~18/30kV is not more than
20PC, 21/35kV~
26/35kV is not more than 10
PC,PVC cable is not larger than 40PC. No cracks or deformation. Test series. Test items. Rated voltage. Partial discharge. Load cycle (without power supply). 3 weeks. Partial discharge. Impulse voltage. ±10 times. DC withstand voltage. Negative polarity. Rated voltage. 7 Inspection rules. JB646492
Test voltage value
6/6、
8.7/112/2018/3021/3526/35
(The 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℃)
Test method
GB11033.1
Article 5.1
GB311.3 and
GB11033.1
Article 5. 3 Articles
GB311.3 and
GB11033.1
Article 5.2
GB11033.1
Article 5.1
No breakdown
Under the specified extinguishing voltage
, the discharge capacity of XLPE,
EPR cable 3.6/6kV
~18/30kV is not more than
20PC, 21/35kV~
26/35kV is not more than 1 0
PC, PVC discharge is not greater than
40PC
Assessed by subsequent tests
Under the specified extinguishing voltage
, the discharge capacity of XLPE,
EPR cable 3.6/6kV
~18/30kV is not greater than
20PC, 21/35kV~
Test procedure
26/35kV is not greater than 10
PC.PVC cable is not greater than
40 PC
No breakdown
No breakdown
No breakdown
7.1 Products should be inspected and qualified by the technical inspection department of the manufacturing unit before they can leave the factory. The products leaving the factory should be accompanied by a product quality inspection certificate. 7.2 The product shall be subjected to type test in accordance with the requirements of Article 5.15.4 and Table 2 of Article 5.6. The number of test samples and the evaluation method of test results shall comply with the relevant provisions in GB11033.
7.3 Sampling test
JB6464—92
7.3.1 During normal production, a sampling test shall be conducted once every 35 years. It shall also be conducted when the user makes a request and both parties agree. 7.3.2 The product shall be subjected to sampling test in accordance with the requirements of Article 5.25.4 and Table 3 of Article 5.6. The number of test samples and the evaluation method of test results shall comply with the relevant provisions in GB11033.
7.4 Routine test
Routine test should be carried out for strict products according to the requirements of Article 5.1. Marking, packaging, transportation and storage
8.1 All kinds of strips and main structural parts and materials used in joints should be marked with brand, name, factory name, and production date, and attached with certificate of conformity or acceptance mark. Materials with storage period must indicate production date and storage period. 8.2 Various strips and materials should be sealed and packaged separately. Each set of straight-through wrapping terminal joints should be packaged in a special packaging box, and the packaging box should 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;
Weight;
Product production date.
Products should be protected from heavy pressure and violent collision during transportation. The product storage area should have fire prevention measures, be dry and ventilated, and the storage period should not exceed the storage date of the corresponding supporting materials and accessories. The performance requirements of self-adhesive rubber insulating tape are shown in Table A1. Serial number
Tensile strength
Elongation %
Rated breakdown voltage
Volume resistivity a·cm
Dielectric loss tangent
Dielectric constant
Self-adhesion
Resistance to thermal stress cracking
Heat resistance
JB 6464-92
Appendix A
Performance requirements of white adhesive rubber insulating tape
(Supplement)
No loosening
No cracking
Light loosening
No cracking
Note: Type 2 insulating tape is recommended for use in the plugs and terminals of extruded insulated cables with a long-term working temperature of 70°C or below. Type 3 insulating tape is recommended for cable joints and final expansion with long-term working temperature of 90℃ or 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
Elongation %
Volume resistivity
Self-adhesion
Resistance to thermal stress cracking
Heat resistance
Performance index
No loosening
No cracking
130℃
G5 520
GB1693
GB1692
GB1693
GB1693
Appendix C to this standard
Appendix C to this standard
Appendix to this standard (Www.bzxZ.net
Test method
GB 3048.3
Appendix C to this standard
Appendix C to this standard
Appendix C to this standard
JB6464—92
Appendix C
Test method for heat resistance, self-adhesion and heat stress cracking resistance of self-adhesive rubber tape (supplement)
C1 Preparation of test specimens
Cut a 150±10mm long section from the finished tape roll, remove the isolation layer, stretch it by 200%~300%, and wrap it in a semi-overlapping manner around a diameter of 10±0.2mm metal rod, wrapped with four layers, the wrapping length is 50±5mm. C2 Heat resistance test
Put the test strip at an ambient temperature of 23±2℃ for 4h, and then prepare 3 samples according to the C1 sample preparation method, and then put the samples in an electric hot air drying oven at 100±2℃ (without air blowing) and take them out after 168h. If the 3 samples have no loosening, deformation, falling, cracking, surface bubbles, etc., the test passes, otherwise the test fails. C3 Self-adhesion test
Put the sample strip at an ambient temperature of 23±2℃ for 4h, and then prepare 3 samples according to the C1 sample preparation method, and then put the samples at this temperature for 24h. If the 3 samples have no automatic loosening, the test passes, if one sample is loose, the test fails. C4 Heat stress cracking test
After placing the sample strip at an ambient temperature of 23±2℃ for 4 hours, prepare 3 samples according to the sample preparation method of C1, and then suspend the samples in an electric heating blast drying oven at 130±2℃ and take them out after 1 hour. If none of the 3 samples crack, the test is passed. If one sample cracks, the test fails.
Appendix D
Main structural dimensions of wrap-around joints using stress cone type (reference part)
D1 The structure of a single-core cable wrap-around joint using stress cone type is shown in Figure D1. 12
1—Cable outer sheath;
5Cable insulation
2-Cable metal shielding layer,
6——Semi-conductive tape porcelain sheath:
10—Cable inner semi-conductive layer;
11~Conductor connection tube;
Binding copper wire;
Copper screen cut-off net:
4-Cable outer semi-conductive layer;
Heat shrink tube:
12——Self-adhesive rubber insulation tape;
D2 The three-core cable wrapping joint structure using stress cone type is shown in Figure D2. 44
9Reaction cone
13—Bridge line.
1- Cable outer sheath;
5--- Electrical insulation:
9- Reaction force maintenance;
JB6464-92
3- Binding steel wire,
2-- Cable metal shielding layer;
7- Copper screen cut-off net:
6- Semi-conductive tape wrapping layer;
11- Conductor connection tube;
Cable inner semi-conductive layer;
14- Cable inner lining layer;
1- Bridge wire:
Note: ① The insulation structure of the three-core cable joint is the same as that of the single-core cable. 4- Cable outer semi-conductive layer;
Heat shrink tube;
12- Self-adhesive rubber insulation tape;
Cable insulation.
②3.6/6kV turnkey shielded cable only has insulation wrapped around each phase joint, and copper shielding net is wrapped after the three phases are paralleled. ③3.6/6kV and below cables only have insulation layer, the thickness is 1.5 times of electric insulation, and the wrapping length is not less than 3 times of the connecting pipe length. The main structural dimensions of the wrapping joint with stress cone type are shown in Table D1. D3
Rated voltage
3.6/6.6/6,6/10
21/35.26/35
Conductor connection outer diameter
Conductor connection length
Note: 3.6/6kV turnkey shielded cable only has insulation wrapped around each phase joint, and copper shielding net is wrapped after the three phases are paralleled. Cables below 3.6/6kV are only covered with an insulation layer, the thickness of which is 1.5 times that of the cable insulation, and the length of the wrapping is not less than 3 times the length of the pipe. Additional remarks:
This standard is proposed and managed by the Shanghai Cable Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Cable Accessories Professional Committee of the China Electrical Equipment Industry Association and the Wire and Cable Association. The main drafters of this standard are Ge Guangming, Zhou Mingyang, and Wu Meisheng. 45
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