JB/T 7832-1995 Straight-through cast-in joints for power cables with rated voltage up to and including 8.7/10 kV
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Straight-through Casting Connectors for Power Cables with Rated Voltages of 8.7/10kV and Below
Subject Content and Scope of Application
JB7832-1995
This standard specifies the product marking and code, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of straight-through casting connectors for power cables with rated voltages of 8.7/10kV and below. This standard applies to straight-through casting cable connectors for paper-insulated power cables and plastic-insulated power cables with rated voltages of U./U of 8.7/10kV and below, and the use conditions shall comply with Article 4.1 of GB11033.1. 2
Referenced standards
GB1034
GB1036
GB1041
GB1408
GB1409
GB1410
GB2406
GB2411
GB2568
GB2569
GB2571
Petroleum products flash point and fire point determination method open cup High voltage test technology
Test method for water absorption of plastics
Determination method for linear expansion coefficient of plastics
Test method for compression of plastics
Test method for power frequency electrical strength of solid insulating materialsTest method for relative dielectric constant and dielectric loss factor of solid insulating materials at power frequency, audio frequency and high frequency (including meter wavelength)
Test method for volume resistivity and surface resistivity of solid insulating materialsTest method for combustion performance of plastics
Oxygen index Number method
Test method for Shore hardness of plastics
Tensile test method for resin porcelain castings
Compression test method for resin castings
Impact test method for resin castings
GB2900.10
GB5589
GB9327
GB10582
GB11033
GB14315
Electrical terminology||tt| |Wires and cables
Test methods for cable accessories
Test methods for cable conductor compression and mechanical connection jointsTest methods for determining electrolytic corrosion caused by insulating materialsBasic technical requirements for power cable accessories with rated voltage of 26/35kV and belowCrimp-type copper and aluminum terminals and connecting tubes for power cable conductorsTest methods for thermal conductivity of plastics
Except for the terms specified in this standard, other terms shall comply with the provisions of GB2900.10 and GB11033.1. 3.1
Straight-through porcelain casting joint
A straight-through joint that uses a thermosetting resin casting agent cast on site at the cable joint as the main body insulation of the joint. Approved by the Ministry of Machinery Industry on November 24, 1995
Implemented on July 1, 1996
4 Product marking and code
4.1 Code
4.1.1 Connection series classification
Straight-through connector series
4.1.2 Classification by material and process characteristics
Epoxy resin casting type
Polyurethane casting type
4.1.3 Classification by matching cable Type classification
Paper insulated power cable
Plastic insulated power cable
4.1.4 According to the order of design
First design.
Second design
(and so on)
4.1.5 According to voltage level
1.8/3kV and below
3.6/6.6/6.6/10kV
8.7/10 kV ....
4.1.6 According to the cable core
4 core·
4.2 Product representation method
4.2.1 The composition and arrangement order of the product model are as follows: 4.2.2 Example
JB7832--1995
JB7832—1995
Cable core number code
Voltage level code
Design consultation code
Matching cable variety code
Material and process characteristic code
Series code||t t||8.7/10kV 3-core paper insulated power cable straight-through epoxy resin casting joint second design, expressed as: JHZ-2-33JB7832-1995
6/10kV 3-core plastic insulated power cable straight-through polyurethane casting joint first design, expressed as: JA-1-23JB7832-1995
5 Technical requirements
JB7832---1995
In addition to complying with the requirements of GB11033 standard, straight-through casting joints shall also comply with the following provisions. 5.1 The porcelain casting material used for straight-through casting joints shall comply with the requirements of Appendix A and Appendix B of this standard. 5.2 Conductor connection fittings shall comply with the corresponding provisions in GB14315, and the DC resistance of the copper-aluminum transition connection tube 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 Bridge wire
The bridge wire of the joint (the metal shielding connection wire of the cable at both ends of the joint) should be tinned copper wire, and its recommended cross-sectional area shall be selected according to the provisions of Table 1, or it can be selected according to the principle of consistency with the cross-sectional area of the cable metal shielding layer. Table 1
Cable main line core cross-sectional area
35 and below
50~120
150~400
50 and below
70~150
185~400
Note: When the cross-sectional area of the joint metal shielding net meets the cross-sectional area of the bridge wire specified in Table 1, the bridge wire can be omitted. 5.4
Sealing protective layer (or protective box)
Cross-sectional area of bridge line
Straight cast joints that are immersed in water for a long time or buried directly should have corresponding sealing protective layer (or protective box) and should be subjected to impact test. After 6 impacts, the sealing protective layer (or protective box) should not be damaged or penetrated. 5.5 Electrical performance
In accordance with the installation process instructions provided by the manufacturer, install the various materials and components of the provided cable terminal on the cable of corresponding specifications with reliable performance for electrical performance test. The test items and requirements should comply with the provisions of Table 2a, Table 2b, Table 3a, and Table 3b. 6 Test methods
The requirements specified in Article 5.1 shall be tested according to the test methods specified in Appendix A. 6.1
The requirements specified in Article 5.2 shall be tested according to the test methods specified in GB9327. 6.3
The requirements specified in Article 5.4 shall be tested according to the test methods specified in Appendix C of this standard. 6.4
The requirements specified in Article 5.5 shall be tested in accordance with the test series and test methods specified in Table 2a, Table 2b, Table 3a and Table 3b. Table 2a
Test items
Power frequency voltage test
Partial discharge test
Constant voltage negative voltage cycle test
3 cycles
Test voltage value, kV
0.6/13.6/6
6/6.6/108.7/10
(The conductor is heated by current for 5h and cooled for 3
h. The maximum temperature of the conductor during heating is the allowable working temperature of the cable plus 5°C)
Test method
CB 11033.I
Article 5.1
Evaluation of test results
No breakdown
Discharge at the specified extinguishing voltage
XLPE cable is not more than 20pC
PVC cable is not more than 40pC
Evaluated by subsequent tests
Test series
Test items
Partial discharge test
Constant voltage load cycle test
a, 60 cycles in air
b. 63 cycles in water
Short-circuit test
Short-circuit thermal stability
Torque circuit dynamic stability
Impact Voltage test 1.2/
50ps±10 times
DC voltage test negative pole
15min
Industrial voltage test
Local fault test
External or inspection
Test items
Power frequency voltage test
Constant voltage load cycle test
8. 63 cycles in air
b. 63 cycles in water
JB7832-1995
Continued Table 2a
Test voltage value, kV
6/6,6/108.7/10
0.6/13.6/6
(The conductor is heated by current for 5h and cooled for 3
h. The maximum coverage of the conductor during heating is the cable
allowable working temperature plus 5C)
(Each sample is short-circuited twice, and the current value should
conform to the provisions of Table 1 of GB11033.1) (Each
sample is short-circuited once, and the current is 63
(All cable joint samples need to be inspected for appearance after all tests
passed)
Test method
GB 5589.3
Under consideration
GB 311.3 and
Test result evaluation
Discharge at specified extinguishing voltage
XLPE cable is not more than 20pC
PVC cable is not more than 40pC
Evaluated by subsequent tests
Evaluated by subsequent tests
GB11033.1
No breakdown
Article 5.3
GB311.3 and
GB11033.1
Article 5.2
GB11033.1
Article 5.1
Test voltage value, kv||t t||0.6/13.6/66/6.6/108.7/10
(The conductor is heated by electric current for 5h and cooled for 3
h. The maximum temperature of the conductor during heating is the allowable working temperature of the electric
frequency plus 5℃)
Test method
GB11033.1
Article 5.1
No breakdown
No breakdown
Discharge at the specified extinguishing voltage
XLPE cable is not more than 20pC
PVC cable is not more than 40pC
No cracks or deformation
Test result evaluation||t t||No breakdown
Evaluated by subsequent tests
Test series
Test series
Test items
Short circuit test
a, short circuit thermal stability
b. Short circuit dynamic stability
Impulse voltage test 1.2/
50μs±10 times
DC voltage test negative pole
15min
Power frequency voltage test
Appearance inspection
Test items
Rated voltage test
Partial discharge test
Load cycle test (not
Voltage) 3 cycles
Partial discharge test
Impulse voltage test 1.2/
50us±10 times
DC voltage test negative pole
15min
Power frequency voltage test 4h
JB7832-1995
Continued Table 2b
Test voltage value, kV
0.6/13.6/66/6.6/108.7/10
(Each sample is short-circuited 2 times, the current value should
conform to the provisions of Table 1 of GB11033.1) (Each
sample is short-circuited 1 times, the current is 63
(All cable joint samples need to be inspected visually after all tests
passed)
Test method
Under consideration
GB311.3 and
Test results and evaluation
Evaluated by subsequent tests
GB11033.1
No breakdown
Article 5.3
GB311.3 and
GB11033.1
Article 5.2
CB11033.1
Article 5.1
Test voltage value, kV
(The conductor is heated by electric current for 5h and cooled for 3
h. The highest temperature of the conductor during heating is the cable
allowable working temperature plus 5℃)
Test method
GB11033.1
Article 5.1
No breakdown
No breakdown
No cracks, no deformation
Test result evaluation
No breakdown
Discharge at the specified filtering voltage
XLPE cable is not more than 20pC
PVC cable is not more than 40pC
Evaluated by subsequent tests
Discharge under specified extinguishing voltage
XLPE cable is not more than 20pC
PVC cable is not more than 40pC
GB311.3 and
GB11033.1 do not break down
Article 5.3
GB311.3 and
do not break down
GB11033.1
Article 5.2
GB11033.1
Article 5.1
do not break down
Test series
Test procedure
Test items
Power voltage test
Impulse voltage test 1.2/
50±10 times
DC voltage test negative pole
15min
Power frequency voltage test 4h
Inspection rules
JB7832-1995
Test voltage value, kV
Test method
GB11033.1
Article 5.1
GB311.3 and
Test result evaluation
No breakdown
GB11033.1 No breakdown
Article 5.3
GB 311.3 and
GB11033.1
Article 5.2
GB 11033.1
Article 5.1
No breakdown
No breakdown
Test procedure
Products shall be inspected and qualified by the technical inspection department of the manufacturer before leaving the factory, and the products leaving the factory shall be accompanied by a product quality inspection certificate. 7.1 Type test
Products shall be type tested in accordance with the requirements of Articles 5.1, 5.2 and Table 2a or Table 2b of Article 5.5, among which the short-circuit test series shall be determined by the supply and demand parties through negotiation whether to conduct the test. When the supporting cable is a plastic insulated cable, Table 2a shall be used, and when it is a paper insulated cable, Table 2b shall be used. The number of test pieces and the test result evaluation method shall be in accordance with the corresponding provisions of the three types of connectors in GB11033. 7.2 Sampling test
7.2.1 During normal production, a sampling test shall be conducted once every 3 to 5 years. It shall also be conducted when the user makes a request and the two parties agree. 7.2.2 Products shall be sampled and tested in accordance with the requirements of Table 3a or Table 3b in Articles 5.2 and 5.5. When the supporting cables are plastic insulated cables, Table 3a shall be used, and when they are paper insulated cables, Table 3b shall be used. 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 connectors in GB11033.
8 Marking, packaging, transportation, storage
8.1 The casting materials and main structural components used for the connectors shall be marked with the brand, name, factory name, and date of manufacture, and shall be accompanied by a certificate of conformity or an acceptance mark. Materials with a storage period must indicate the date of manufacture and storage period. 8.2 Various materials used in the joints should be sealed and packed separately. Each set of cast joints should be packed in a special packing box, which should be accompanied by a list of materials, a certificate of conformity and an installation process manual. 8.3 The packing box should indicate:
Manufacturer name;
Product model, name, product standard number; rated voltage;
Conductor material, cross-section and number of cores;
Factory date.
8.4 Products should be protected from heavy pressure and strong magnetism during transportation. 8.5 The product should be stored away from heat sources and have fire prevention measures, dry and ventilated. The storage period should not exceed the storage date of the corresponding supporting materials and accessories.
JB78321995
Appendix A
General technical requirements for thermosetting resin castings for power cable accessories
(Supplement)
A1 The requirements specified in the appendix of this standard apply to thermosetting room temperature curing resin castings for power cable accessories with epoxy resin and polyurethane resin as basic materials.
A2 Casting agent manufacturers should conduct tests according to the items (118) specified in Appendix B. Under normal production conditions, sampling tests should be carried out every two years according to items 2, 3, 8, 12 (flame retardant type); 14, 15, 17 (used as outdoor terminal external insulation); 18 (used for paper insulated cables) in Appendix B, and test reports should be provided according to supply requirements. Sampling tests can also be negotiated when users require it. Accessory manufacturers can also use the requirements specified in Appendix B as the basis for acceptance of casting agents.
The components of the casting agent should be packaged separately in sealed containers, and the packaging method should be convenient for on-site operation. A4
The following instructions should be attached to the packaging container:
Type of base material of the casting agent;
Brief instructions for the mixing and pouring process of the casting agent (including the casting time limit); Operation safety precautions;
Minimum waiting time after casting to acceptance test or commissioning: Storage conditions and storage period;
Production date;
Manufacturer name and registered trademark;
Net weight of casting material;
Standards that the casting performance meets.
Note: If the writing space on the packaging container is limited, the above items b. c and d can be explained separately. The manufacturer must also provide the following information:
The maximum reaction temperature at an ambient temperature of 35°C; The volume expansion coefficient of the solidified casting in the temperature range of 20°C to 50°C: The thermal conductivity of the casting after solidification.
Appendix B
Main performance requirements of thermosetting resin casting agent for power cable accessories
(Supplement)
Flash point (in open crucible)
Material not participating in the reaction
Material participating in the reaction
Not less than
Not less than
Not less than
Pouring time limit (each package quantity)
At ambient temperature 5C, 23C, 35C
Maximum reaction temperature
Physical structure
Not more than
Polyurethane
Epoxy resin
Cutting along the middle and axis of the sample should be uniform. No bubbles visible to the naked eye. Individual bubbles on the surface can be ignored. Test method
GB 267
Appendix to this standard
Appendix C to this standard
Appendix (to this standard):
Punch strength
Compressive strength
Compression test
30% compressive stress
Not less than
Not less than
Not less than
Residual deformation after unloading for 24 hours
Hardness (Bosch D)
Tensile strength
Elongation at break||tt ||Thermal conductivity
Combustion characteristics
Water absorption
Oxygen index
23C cold water immersion for 24h
50C hot water immersion for 42d
Coefficient of thermal expansion
(from 20 (judgment 50C)
T-frequency withstand voltage 23C1min
Dielectric constant <50Hz>23C
Volume conductivity
After 24h immersion at 23C
Oil resistance||tt ||80C viscous impregnated cable oil 168h
Weight change rate
not more than
not less than
not less than
not less than
not less than
not less than
not less than
not more than
not more than
not less than
not less than
not less than
not less than
JB7832-19 95
N·mm/mm
W·m\\K\!
Note: 1) This requirement applies only to casting agents for paper insulated cables. Appendix C
Polyurethane
Epoxy resin
Main properties test method of thermosetting resin casting agent for power cable accessories (supplement)
Test method for casting time limit
Test method
GB2571
GB2569
GB 1041
GB 2411
GB2568
GB2568
GB2406
GB 1034
GB1036
GB 1408
GB1409
GB 1410
Appendix C of this standard
Casting time refers to the period from the time the components of the porcelain casting are mixed together until the casting can just flow smoothly and continuously from a glass rod without visible gel component, that is, the time allowed for casting. C1.1
Test equipment
One glass rod with a diameter of about 8mm and a length of about 250mm:
One container for storing the tested casting material;
One container with a heat-insulating layer for storing the container in item b: One electric heating oven with natural ventilation:
One 0～50C thermometer:
One timer.
Test operation
C1.2.1Put the tested casting material (including resin, curing agent and other compounding agents) and the objects in items a, bc in item C1.1 in the electric heating oven, make them reach the specified temperature, and keep it for 1 hour. 118
JB7832-1995
C1.2.2 According to the instruction manual, pour the components of the casting agent into the container of C1.1b (the container is placed in the heat-insulating container of c), mix thoroughly and evenly with a glass rod at a warm state, and record the time from the start of mixing. C1.2.3 Insert the glass rod from the middle of the mixture to 1/2 of its depth at appropriate intervals, and then pull it out vertically to about 20 cm from its surface, and observe the casting agent flowing down from the glass rod. If gel particles appear in the flowing material, or it can only drip instead of flowing down from the glass rod continuously, it means that the use time has been exceeded. Record the time when this situation occurs and round it off to minutes, which is the casting time limit for the package.
C2 Test method for maximum reaction temperature and physical structure C2.1 Test apparatus
Select the largest specification cable joint box (or joint casting mold shell) and the smallest cross-section cable of this specification. The cable length is the length of the joint box plus 400mm
A thermocouple sleeve with an indicating instrument;
An electric heating oven;
A timer.
C2.2 Test operation
C2.2.1 Install the cable specified in C2.1a in the joint box according to the instruction manual, and fix the thermocouple specified in C2.1b on the insulation surface of the near-center core of the joint box. The cables at both ends of the joint box are about 200mm long. Then put the installed joint and the casting agent used (including resin, curing agent and other compounding agents) in the electric heating oven of C2.1c to make it reach (35±2)°C and keep it for 1h. C2.2.2 Mix the various components of the casting agent according to the instruction manual, inject them into the joint box, and immediately put it in the electric heating oven. Measure the maximum curing reaction temperature of the casting agent at a temperature of (35±2)°C, and record the time from the mixing of the various components of the casting agent. C2.2.3 Place the joint sample after the maximum reaction temperature is measured at ambient temperature for 24h, and then cut it in the middle of the joint sample perpendicular to the axis. Perform physical Structural inspection. C3 Oil resistance test method
C3.1 Test equipment and materials
3 beakers of 300mL;
1 electric constant temperature water bath;
1 balance with a sensitivity of 0.1g;
300mL of viscous cable oil;
3 specimens with a diameter of $50mm and a thickness of 2mm. C3.2 Test operation
Pour 100ml of oil into each of the three beakers. .Immerse the cable oil in a viscous cable and then place it in an 80°C electric constant temperature water bath. After 5 minutes, place the three samples in three beakers (the samples should be completely immersed in the cable oil) and start timing. Take out the samples after 168 hours. Use filter paper to repeatedly absorb the oil on the surface of the sample until there is no obvious oil mark on the filter paper, then weigh the sample. The oil absorption rate is calculated according to formula (C1):
Where: (,-—mass of the sample before oil immersion, g:G. Weight of the sample after oil immersion.;
W---Oil absorption rate.%.
Take the arithmetic mean of 3 samples.
C4 Impact test
C4.1 Test device
W=GG,
×100%
（Cl）
The test device is shown in Figure C1. The impact block is made of steel. There are guide rails on both sides of the support frame to ensure that the impact block can fall freely in the specified direction. The top of the support frame is equipped with a pulley for lifting the impact block. 419bzxz.net
C4.2 Test method
JB7832--1995
Maintain the correct direction of the guide
R is 2m
Joint sample
Sand support
Impact test device
C4.2.1As shown in Figure C1, place the sample under the support frame of the test device and fix the cables at both ends of the sample. Ensure that the sample does not roll during the test.
C4.2.2Lift the impact block to the specified height (see Figure C1). C4.2.3Let the impact block fall freely and impact the sample C4.2.4Take out the sample and observe whether the sealing protective layer (or protective box) of the sample is damaged. Whether it is penetrated. C4.3 Evaluation of test results
After the impact test, the sealing protective layer (or protective box) of the sample should not be damaged or penetrated. Additional remarks:
This standard is proposed and managed by the Shanghai Cable Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Cable Research Institute of the Ministry of Machinery Industry. The main drafter of this standard is Ge Guangming.
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