This standard specifies the classification, technical requirements, test methods and acceptance rules for power cable joints with rated voltages of 26/35KV and below. This standard applies to joints and terminals of oil-paper insulated and extruded insulated power cables for power transmission and distribution with rated voltages U0/U of 26/35KV and below. JB/T 8144.1-1995 General provisions for basic technical requirements for power cable accessories with rated voltages of 26/35kV and below JB/T8144.1-1995 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T8144.1-1995
Basic technical requirements for power cable accessories with rated voltage of 26/35kV and below
General provisions
Published on October 10, 1995
Ministry of Machinery Industry of the People's Republic of China
Implementation on October 10, 1995
Machinery Industry Standard of the People's Republic of China
Basic technical requirements for power cable accessories with rated voltage of 26/35kV and below
General provisions
1 Subject content and scope of application
JB/T 8144.1-1995
This standard specifies the terminology, technical requirements, test methods and product marking, packaging, transportation, storage, etc. of power cable accessories with rated voltage of 26/35kV and below.
This standard applies to power cable accessories with rated voltage U. /U is the joint and terminal of oil-paper insulated and extruded insulated power cables for transmission and distribution of 26/35kV and below,
Note: 1)U. It is the effective value of the rated power-frequency voltage between the conductor and the grounding electrode or shield taken for the design of cable accessories; U is the effective value of the rated power-frequency voltage of the power system using the cable accessories. This standard can also be used as a reference for the requirements of non-detachable terminal devices directly installed in electrical equipment and plug-in cable terminals and connectors (with conductor connecting fittings).
2 Referenced standards
GB2951
GB5589
GB 2900.10
GB9327
3 Terminology
Test methods for mechanical and physical properties of wires and cables Test methods for cable accessories
Insulation coordination of high-voltage transmission and transformation equipment High voltage test technology Test method for artificial pollution migration of high-voltage insulators for AC systems Salt spray method Electrical terminology Wires and cables
Test method for cable conductor compression and mechanical connection joints Except for the terms specified in this standard, other terms should comply with the provisions of GB2900.10. 3.1 Oil-paper insulated power cable
The oil-paper insulated power cable referred to in this standard includes viscous oil-impregnated paper insulated power cable and non-drip oil-impregnated paper insulated power cable. 3.2 Extruded insulated power cable
Extruded insulated power cable refers to a power cable that is extruded with various rubbers or plastics as insulating materials. 3.3 Cable terminal head
A terminal device installed at the end of the cable to ensure that the cable is electrically connected to the rest of the system and maintains insulation until the connection point. 3.3.1 Indoor terminal head
The indoor terminal head is a cable terminal device used for the insulated lead-out part of the cable terminal conductor that is not affected by the atmosphere. 3.3.2 Outdoor terminal head
The outdoor terminal head is a cable terminal device used for the insulated lead-out part of the cable terminal conductor that can withstand the influence of the atmosphere. Approved by the Ministry of Machinery Industry on October 10, 1995
Implemented on October 10, 1995
3.4 ​​Cable joints
JB/T8144.1-1995
A device that connects two or more cables to make the cable line continuous. 3.4.1 Straight joint
A cable joint that connects two cables to each other. 3.4.2 Branch joint
A cable joint that connects multiple cables to each other. 3.4.3 Transition joint
A cable joint that connects two cables with different insulation. The transition joint referred to in this standard is only a joint that connects a viscous oil-impregnated paper insulated cable with an extruded insulated cable. 3.4.4 Conversion joint
A cable joint that connects two cables with the same insulation but different structures (such as a three-core cable and three single-core cables). 3.4.5 Stopper joint
A cable joint that can prevent the liquid insulating agent in one end of the cable from flowing into the other end of the cable and can withstand a certain pressure. 4 Technical requirements
4.1 The cable accessories specified in this standard can operate normally under the following conditions of use: 8. The maximum air temperature is not higher than +40C and not lower than 40℃; b. The altitude does not exceed 1000m;
c. The long-term working temperature, overload temperature and short-circuit temperature of the cable accessories shall meet the requirements of the matching cables. 4.2 The corresponding performance test items and indicators of the cable accessories used under the following conditions need to be considered separately: a. The maximum air temperature is lower than -40℃, or higher than +40℃; b. The altitude exceeds 1000m;
c. Long-term operation in areas with strong vibration, strong wind, ice and snow and serious pollution, the technical requirements of the cable terminal head shall comply with the provisions of Chapter 3 of GB11033.2. 4.31
4.4 The technical requirements for cable joints shall comply with the provisions of Chapter 3 of GB11033.3.4.5 The test of cable accessories after installation may be carried out in accordance with the provisions of Appendix A. 5 Test method
5.1 Power frequency voltage test
Note: When the cable terminal is used in areas with an altitude higher than 1000m, the test voltage should be corrected with reference to Appendix A. 5.1.1 Test power supply
The test power supply should comply with the provisions of Article 3.2 of GB311.3. Its voltage and capacity should be able to meet the voltage and capacitive current requirements for the cable accessories sample test.
5.1.2 Wiring method
5.1.2.1 The cable accessories installed on the single-core cable are combined with the cable to form a combined sample. The cable shield (or metal sheath) is grounded and a single-phase AC voltage is applied to the conductor.
5.1.2.2 The cable accessories installed on the three-core split-phase shielded (or split-phase lead sheathed) cable are combined with the cable to form a combined sample. The three-phase insulation shield and armor are grounded. A single-phase AC voltage is applied to one phase conductor and the other two phase conductors are grounded. Under the condition that the capacity of the test equipment permits, a single-phase AC voltage can also be applied to the three-phase conductors at the same time. It is also allowed to apply three-phase AC voltage to three-phase conductors at the same time. 5.1.2.3 For the combined test specimen consisting of cable accessories and cables installed on three-core or four-core overall shielded (or lead sheathed) cables (unless otherwise specified), a single-phase AC voltage is applied to one phase conductor, and the remaining conductors and the cable shield (or lead sheath) and armor are grounded. 5.1.3 Rain conditions for wet withstand voltage test 2
JB/T8144.1-1995
The rain conditions for wet withstand voltage test shall comply with the provisions of Chapter 4 of GB311.2 when the sample height is less than 1m. 5.1.4 Pressurization method||tt| |5.1.4.1 Fixed value withstand voltage
First apply a voltage not greater than 20% of the specified value, then continuously increase the voltage to 75% of the specified value at a speed of 5 to 7 kV/s, and then increase the voltage to the specified value within 5 to 30 seconds, and maintain it for the specified time. During the specified time, the voltage fluctuation should not be greater than ± 3% of the applied voltage value. For 1min and 15min voltage tests, the voltage shall not be interrupted. For voltage tests of 4h and above (unless otherwise specified), the voltage interruption time shall not exceed 0.5h, and the interruption time shall not be included in the total test time. The test results shall be converted into values ​​under standard atmospheric conditions in accordance with GB311.2.
5.1.4.2 Wet withstand voltage
The test sample shall be pre-rinsed for at least 15 minutes in accordance with 5.1.3, and then the voltage shall be applied in accordance with 5.1.4.1 of this standard. The pre-rinsing time may include the time required to adjust the spray. If special methods can ensure that the test product is effectively and evenly exposed to rain, or if the test is repeated after a short time interval, the pre-raining time can be shortened.
5.2 DC voltage test
5.2.1 Test power supply
The test power supply shall comply with Article 2.2 of GB311.3. 5.2.2 Wiring method
The test power supply shall comply with Article 5.1.2 of this standard. The conductor to which high voltage is applied shall be connected with negative polarity. 5.2.3 Pressurization method
The pressurization method shall comply with Article 2.5 of GB311.3. 5.3 Impulse voltage test
5.3.1 Test power supply
The test power supply shall comply with Article 4.1 of GB311.3. 5.3.2 Wiring method
The wiring method of the test product shall comply with Article 5.1.2 of this standard. The grounding terminal of the impulse voltage generating system, the grounding terminal of the measuring system and the grounding terminal of the test object shall be connected to each other. The impedance between the grounding terminals shall be as small as possible. The grounding terminal of the voltage divider of the measuring panel system shall be as close to the above grounding point as possible.
5.3.3 Pressurization method
The pressurization method, measuring method and measuring instrument requirements shall be in accordance with the corresponding provisions of GB311.3. When changing the polarity of the test voltage, in order to avoid the polarization of the insulating medium of the test object and cause damage to the insulating part, 50% of the test voltage value shall be applied after the polarity is changed, and then gradually increased to the rated test voltage value to neutralize the polarization effect. 5.4 Precautionary pressure load cycle test
The test shall be carried out in accordance with the provisions of GB5589.2.
Partial discharge measurement
The test shall be carried out in accordance with the provisions of GB5589.3
5.6 Salt spray test
Terminals with organic external insulation shall be tested in accordance with GB5589.5, and those with inorganic external insulation shall be tested in accordance with GB4585.1.
5.7 Humidity test
Tested in accordance with GB5589.6,
Pressure seal test
Tested in accordance with GB5589.4.
Short circuit test
JB/T8144.1-1995
In the range of ambient temperature of 10 to 30, the short circuit performance test of the fully installed cable accessory samples shall be carried out. The minimum short circuit time of the short circuit thermal stability test is 1s. Considering the equipment capacity, the short circuit time can be extended, but the current value shall not be less than 10kA (effective value). Each sample is short-circuited twice. After the first short circuit test, the sample needs to be cooled to room temperature before the second test. Single-phase cable accessories adopt single-phase test, three-core cable accessories can also adopt single-phase test, each phase shall be tested twice, short-circuit dynamic stability test shall be carried out once for each sample, short-circuit time shall be 3 to 10 half cycles, waveform and amplitude shall be observed with oscilloscope, single-phase test shall be adopted for single-core cable accessories, three-phase test shall be adopted for three-core cable accessories, short-circuit test method is under consideration,
1s short-circuit thermal stability current shall comply with the provisions of Table 1, 1s short-circuit thermal stability current shall be calculated according to formula (3), Table 1
Cable structure and rated voltage
Cable insulation type
XLPE, EPR
Turnkey insulated cable 0.6/ 1~3.6/6
Turnkey insulated cable6/10~8.7/10
0.6/1~3.6/6
Single-core, three-core split-phase screen6/10~8.7/10
Shielded and split-phase lead sheathed cable
Single-core and multi-core
0.6/1~6/10
18/30~26/35
Cross-sectional area ≤300mm2
Cross-sectional area>300mm2
Single-core and multi-core cable0.6/1~26/35
Single-core and multi-core cable0.6/1~26/35||tt ||Before short circuit
Conductor temperature
Conductor during short circuit
Highest temperature
1s short circuit thermal stability current density
Copper conductor
119(108)
121(119)
119(108)
120(115)
143(100)
Note: ①For conductors connected by brazing, the short circuit temperature must not exceed 160℃, and the 1s short circuit thermal stability current density is the value in brackets. ②The abbreviations of cable insulation types are as follows: PILC-
-Oil-paper insulation Insulation; PVC-
acrylic rubber insulation,
polyvinyl chloride insulation; PE
polyethylene insulation; XLPE
cross-linked polyethylene insulation; EPR--Z
When the conductor temperature before short circuit is not the value specified in the table, the 1s short circuit thermal stability current density can be calculated by the following formula: Copper conductor:
Aluminum conductor:
Where: Jca
Jcu=226.2Kc
JAI=147.37KA1
234.45+Ts2
234.45+Tsi
228.14 + Ts2
228.14+Tsi
-1s short-circuit thermal stability current density of copper conductor, A/mm\; -1s short-circuit thermal stability current density of aluminum conductor, A/mm2; temperature of conductor before short circuit, ℃;
highest temperature of conductor during short circuit, annihilation,
The short-circuit thermal stability current when the short-circuit time is 1 can be calculated by formula (3): It
JB/T8144.1-1995
Where: I——short-circuit thermal stability current when the short-circuit time is 1, A; I——1s short-circuit thermal stability current, A;
tshort-circuit time, s.
5.10 Radio interference test
The radio interference test method is under consideration. 5.11 Mechanical strength test
The mechanical strength test shall be carried out on the fully assembled factory-made cable terminal box or joint box sample. The sample shall be subjected to the specified water pressure or oil pressure and maintained under the specified pressure for a certain period of time. 5.12 Cable accessories conductor connection joint test The performance test of cable joints and terminal head conductor connection joints shall be carried out in accordance with GB9327. 6 Product marking, packaging, transportation and storage 6.1 Product marking
Each cable accessory product leaving the factory must be marked with obvious permanent markings, and the marking contents are as follows: a.
Manufacturer name;
b, product model and name;
c. Rated voltage;
d. Conductor cross section;
e. Date of manufacture and serial number;
f. Validity period (for certain materials or components);
For certain cable accessories (such as wrapped type, heat shrink type, cast type, etc.), the factory only provides materials or components, and they become complete cable accessories through on-site production. For such cable accessories, in addition to the corresponding marks on the materials or components when they leave the factory, the manufacturer should also attach marks in the supporting materials that can be fixed by users in obvious positions on the cable accessories after the cable accessories are installed. 6.2 Product packaging
6.2.1 The packaging method of cable accessories depends on the characteristics of the product, but there must be corresponding waterproof and sealing measures for insulating parts, conductive parts, insulating materials, etc., and there must be corresponding anti-pressure and anti-impact packaging measures for fragile and pressure-sensitive parts or materials, and the corresponding words or marks shall be printed in obvious positions on the outside of the packaging. All flammable parts or materials shall have fire prevention marks. 6.2.2 The product packaging should be accompanied by a complete list of all installation parts and materials. 6.2.3 The factory packaging of cable accessories must be accompanied by installation instructions and structural diagrams. The instructions should specify the following: product model, specifications, applicable places (such as indoors or outdoors; general environment or harsh environment, etc.); a.
Rated voltage used;
Type, model and cross-section of the cable to be used. 6.3 Product transportation
The transportation requirements of cable accessories should be determined according to the characteristics of various cable accessories. 6.3.1 Insulating parts, conductive parts, and insulating materials (such as insulating tapes and insulating agents) must be protected from rain and direct sunlight during transportation. 6.3.2 Fragile insulating parts such as porcelain and glass should be protected from strong vibration and impact during transportation and loading and unloading. 6.3.3 Flammable materials (such as insulating tapes and insulating agents) should be transported in accordance with relevant national regulations. 6.4 Product Purchase and Storage
Storage requirements for cable accessories should be determined according to the characteristics of various cable accessories. 6.4.1 Insulating parts and insulating materials of organic materials must be stored in dry and ventilated warehouses with room temperature not exceeding 35°C. 6.4.2 Flammable materials (such as insulating tapes and insulating agents) should be stored in warehouses with fire prevention measures. Cable accessories that have been stored for longer than the period specified in the corresponding product standards should be removed from the warehouse and shall not be issued as qualified products. 6.4.3
JB/T8144.1-1995
Appendix A
Application Guide
(Reference)
A1 When the cable terminal is used in areas with an altitude higher than 1000m, the test voltage shall be the withstand voltage specified in the standard multiplied by the altitude correction factor K:
ca = 1.1 - H × 10 -4
Where: H—altitude above sea level of the installation site, m, A2 Cable accessories shall be tested together with the cable after installation, and the test requirements shall be consistent with the cable regulations, 6
Standard of the People's Republic of China
Mechanical Industry Standard
Basic Technical Requirements for Power Cable Accessories with Rated Voltage of 26/35kV and Below
General Provisions
JB/T 8144.1-1995
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Print runs 1-XXX
Postal code 100044)
Printed sheets X/X
Number of words XXX,XXX
Print runs X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standards Service Network: http://www.JB.ac.cn66_86,
Pressure sealing test
Test according to GB5589.4.
Short circuit test
JB/T8144.1-1995
In the ambient temperature range of 10~30, the short circuit performance test is carried out on the fully installed cable accessory samples. The short circuit thermal stability test has a minimum short circuit time of 1s. Considering the equipment capacity, the short circuit time can be extended, but the current value shall not be less than 10kA (effective value). Each sample is short-circuited twice. After the first short circuit test, the sample needs to be cooled to room temperature before the second test. Single-phase cable accessories adopt single-phase test, three-core cable accessories can also adopt single-phase test, each phase shall be tested twice, short-circuit dynamic stability test shall be carried out once for each sample, short-circuit time is 3 to 10 half cycles, use oscilloscope to observe waveform and amplitude, single-core cable accessories adopt single-phase test, three-core cable accessories shall adopt three-phase test, short-circuit test method is under consideration,
1s short-circuit thermal stability current shall comply with the provisions of Table 1, 1s short-circuit thermal stability current shall be calculated according to formula (3), Table 1
Cable structure and rated voltage
Cable insulation type
XLPE, EPR
Turnkey insulated cable 0.6/ 1~3.6/6
Turnkey insulated cable6/10~8.7/10
0.6/1~3.6/6
Single-core, three-core split-phase screen6/10~8.7/10
Shielded and split-phase lead sheathed cable
Single-core and multi-core
0.6/1~6/10
18/30~26/35
Cross-sectional area ≤300mm2
Cross-sectional area>300mm2
Single-core and multi-core cable0.6/1~26/35
Single-core and multi-core cable0.6/1~26/35||tt ||Before short circuit
Conductor temperature
Conductor during short circuit
Highest temperature
1s short circuit thermal stability current density
Copper conductor
119(108)
121(119)
119(108)
120(115)
143(100)
Note: ①For conductors connected by brazing, the short circuit temperature must not exceed 160℃, and the 1s short circuit thermal stability current density is the value in brackets. ②The abbreviations of cable insulation types are as follows: PILC-
-Oil-paper insulation Insulation; PVC-
acrylic rubber insulation,
polyvinyl chloride insulation; PE
polyethylene insulation; XLPE
cross-linked polyethylene insulation; EPR--Z
When the conductor temperature before short circuit is not the value specified in the table, the 1s short circuit thermal stability current density can be calculated by the following formula: Copper conductor:
Aluminum conductor:
Where: Jca
Jcu=226.2Kc
JAI=147.37KA1
234.45+Ts2
234.45+Tsi
228.14 + Ts2
228.14+Tsi
-1s short-circuit thermal stability current density of copper conductor, A/mm\; -1s short-circuit thermal stability current density of aluminum conductor, A/mm2; temperature of conductor before short circuit, ℃;
highest temperature of conductor during short circuit, annihilation,
The short-circuit thermal stability current when the short-circuit time is 1 can be calculated by formula (3): It
JB/T8144.1-1995
Where: I——short-circuit thermal stability current when the short-circuit time is 1, A; I——1s short-circuit thermal stability current, A;
tshort-circuit time, s.
5.10 Radio interference test
The radio interference test method is under consideration. 5.11 Mechanical strength test
The mechanical strength test shall be carried out on the fully assembled factory-made cable terminal box or joint box sample. The sample shall be subjected to the specified water pressure or oil pressure and maintained under the specified pressure for a certain period of time. 5.12 Cable accessories conductor connection joint test The performance test of cable joints and terminal head conductor connection joints shall be carried out in accordance with GB9327. 6 Product marking, packaging, transportation and storage 6.1 Product marking
Each cable accessory product leaving the factory must be marked with obvious permanent markings. The marking contents are as follows: a.
Manufacturer name;
b, product model and name;
c. Rated voltage;
d. Conductor cross section;
e. Date of manufacture and serial number;
f. Validity period (for certain materials or components);
For certain cable accessories (such as wrapped type, heat shrink type, cast type, etc.), the factory only provides materials or components, and they become complete cable accessories through on-site production. For such cable accessories, in addition to the corresponding marks on the materials or components when they leave the factory, the manufacturer should also attach marks in the supporting materials that can be fixed by users in obvious positions on the cable accessories after the cable accessories are installed. 6.2 Product packaging
6.2.1 The packaging method of cable accessories depends on the characteristics of the product, but there must be corresponding waterproof and sealing measures for insulating parts, conductive parts, insulating materials, etc., and there must be corresponding anti-pressure and anti-impact packaging measures for fragile and pressure-sensitive parts or materials, and the corresponding words or marks shall be printed in obvious positions on the outside of the packaging. All flammable parts or materials shall have fire prevention marks. 6.2.2 The product packaging should be accompanied by a complete list of all installation parts and materials. 6.2.3 The factory packaging of cable accessories must be accompanied by installation instructions and structural diagrams. The instructions should specify the following: product model, specifications, applicable places (such as indoors or outdoors; general environment or harsh environment, etc.); a.
Rated voltage used;
Type, model and cross-section of the cable to be used. 6.3 Product transportation
The transportation requirements of cable accessories should be determined according to the characteristics of various cable accessories. 6.3.1 Insulating parts, conductive parts, and insulating materials (such as insulating tapes and insulating agents) must be protected from rain and direct sunlight during transportation. 6.3.2 Fragile insulating parts such as porcelain and glass should be protected from strong vibration and impact during transportation and loading and unloading. 6.3.3 Flammable materials (such as insulating tapes and insulating agents) should be transported in accordance with relevant national regulations. 6.4 Product Purchase and Storage
Storage requirements for cable accessories should be determined according to the characteristics of various cable accessories. 6.4.1 Insulating components and insulating materials of organic materials must be stored in dry and ventilated warehouses with room temperature not exceeding 35°C. 6.4.2 Flammable materials (such as insulating tapes and insulating agents) should be stored in warehouses with fire prevention measures. Cable accessories that have been stored for longer than the period specified in the corresponding product standards should be removed from the warehouse and shall not be issued as qualified products. 6.4.3
JB/T8144.1-1995
Appendix A
Application Guide
(Reference)
A1 When the cable terminal is used in areas with an altitude higher than 1000m, the test voltage shall be the withstand voltage specified in the standard multiplied by the altitude correction factor K:
ca = 1.1 - H × 10 -4
Where: H—altitude above sea level of the installation site, m, A2 Cable accessories shall be tested together with the cable after installation, and the test requirements shall be consistent with the cable regulations, 6
Standard of the People's Republic of China
Mechanical Industry Standard
Basic Technical Requirements for Power Cable Accessories with Rated Voltage of 26/35kV and Below
General Provisions
JB/T 8144.1-1995
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Print runs 1-XXX
Postal code 100044)
Printed sheets X/X
Number of words XXX,XXX
Print runs X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standards Service Network: http://www.JB.ac.cn66_86,
Pressure sealing test
Test according to GB5589.4.
Short circuit test
JB/T8144.1-1995
In the ambient temperature range of 10~30, the short circuit performance test is carried out on the fully installed cable accessory samples. The short circuit thermal stability test has a minimum short circuit time of 1s. Considering the equipment capacity, the short circuit time can be extended, but the current value shall not be less than 10kA (effective value). Each sample is short-circuited twice. After the first short circuit test, the sample needs to be cooled to room temperature before the second test. Single-phase cable accessories adopt single-phase test, three-core cable accessories can also adopt single-phase test, each phase shall be tested twice, short-circuit dynamic stability test shall be carried out once for each sample, short-circuit time is 3 to 10 half cycles, use oscilloscope to observe waveform and amplitude, single-core cable accessories adopt single-phase test, three-core cable accessories shall adopt three-phase test, short-circuit test method is under consideration,
1s short-circuit thermal stability current shall comply with the provisions of Table 1, 1s short-circuit thermal stability current shall be calculated according to formula (3), Table 1
Cable structure and rated voltage
Cable insulation type
XLPE, EPR
Turnkey insulated cable 0.6/ 1~3.6/6
Turnkey insulated cable6/10~8.7/10
0.6/1~3.6/6
Single-core, three-core split-phase screen6/10~8.7/10
Shielded and split-phase lead sheathed cable
Single-core and multi-core
0.6/1~6/10
18/30~26/35
Cross-sectional area ≤300mm2
Cross-sectional area>300mm2
Single-core and multi-core cable0.6/1~26/35
Single-core and multi-core cable0.6/1~26/35||tt ||Before short circuit
Conductor temperature
Conductor during short circuit
Highest temperature
1s short circuit thermal stability current density
Copper conductor
119(108)
121(119)
119(108)
120(115)
143(100)
Note: ①For conductors connected by brazing, the short circuit temperature must not exceed 160℃, and the 1s short circuit thermal stability current density is the value in brackets. ②The abbreviations of cable insulation types are as follows: PILC-
-Oil-paper insulation Insulation; PVC-
acrylic rubber insulation,
polyvinyl chloride insulation; PE
polyethylene insulation; XLPE
cross-linked polyethylene insulation; EPR--Z
When the conductor temperature before short circuit is not the value specified in the table, the 1s short circuit thermal stability current density can be calculated by the following formula: Copper conductor:
Aluminum conductor:
Where: Jca
Jcu=226.2Kc
JAI=147.37KA1
234.45+Ts2
234.45+Tsi
228.14 + Ts2
228.14+Tsi
-1s short-circuit thermal stability current density of copper conductor, A/mm\; -1s short-circuit thermal stability current density of aluminum conductor, A/mm2; temperature of conductor before short circuit, ℃;
highest temperature of conductor during short circuit, annihilation,
The short-circuit thermal stability current when the short-circuit time is 1 can be calculated by formula (3): It
JB/T8144.1-1995
Where: I——short-circuit thermal stability current when the short-circuit time is 1, A; I——1s short-circuit thermal stability current, A;
tshort-circuit time, s.
5.10 Radio interference test
The radio interference test method is under consideration. 5.11 Mechanical strength test
The mechanical strength test shall be carried out on the fully assembled factory-made cable terminal box or joint box sample. The sample shall be subjected to the specified water pressure or oil pressure and maintained under the specified pressure for a certain period of time. 5.12 Cable accessories conductor connection joint test The performance test of cable joints and terminal head conductor connection joints shall be carried out in accordance with GB9327. 6 Product marking, packaging, transportation and storage 6.1 Product marking
Each cable accessory product leaving the factory must be marked with obvious permanent markings. The marking contents are as follows: a.
Manufacturer name;
b, product model and name;
c. Rated voltage;
d. Conductor cross section;
e. Date of manufacture and serial number;
f. Validity period (for certain materials or components);
For certain cable accessories (such as wrapped type, heat shrink type, cast type, etc.), the factory only provides materials or components, and they become complete cable accessories through on-site production. For such cable accessories, in addition to the corresponding marks on the materials or components when they leave the factory, the manufacturer should also attach marks in the supporting materials that can be fixed by users in obvious positions on the cable accessories after the cable accessories are installed. 6.2 Product packaging
6.2.1 The packaging method of cable accessories depends on the characteristics of the product, but there must be corresponding waterproof and sealing measures for insulating parts, conductive parts, insulating materials, etc., and there must be corresponding anti-pressure and anti-impact packaging measures for fragile and pressure-sensitive parts or materials, and the corresponding words or marks shall be printed in obvious positions on the outside of the packaging. All flammable parts or materials shall have fire prevention marks. 6.2.2 The product packaging should be accompanied by a complete list of all installation parts and materials. 6.2.3 The factory packaging of cable accessories must be accompanied by installation instructions and structural diagrams. The instructions should specify the following: product model, specifications, applicable places (such as indoors or outdoors; general environment or harsh environment, etc.); a.
Rated voltage used;
Type, model and cross-section of the cable to be used. 6.3 Product transportation
The transportation requirements of cable accessories should be determined according to the characteristics of various cable accessories. 6.3.1 Insulating parts, conductive parts, and insulating materials (such as insulating tapes and insulating agents) must be protected from rain and direct sunlight during transportation. 6.3.2 Fragile insulating parts such as porcelain and glass should be protected from strong vibration and impact during transportation and loading and unloading. 6.3.3 Flammable materials (such as insulating tapes and insulating agents) should be transported in accordance with relevant national regulations. 6.4 Product Purchase and Storage
Storage requirements for cable accessories should be determined according to the characteristics of various cable accessories. 6.4.1 Insulating components and insulating materials of organic materials must be stored in dry and ventilated warehouses with room temperature not exceeding 35°C. 6.4.2 Flammable materials (such as insulating tapes and insulating agents) should be stored in warehouses with fire prevention measures. Cable accessories that have been stored for longer than the period specified in the corresponding product standards should be removed from the warehouse and shall not be issued as qualified products. 6.4.3
JB/T8144.1-1995
Appendix A
Application Guide
(Reference)
A1 When the cable terminal is used in areas with an altitude higher than 1000m, the test voltage shall be the withstand voltage specified in the standard multiplied by the altitude correction factor K:
ca = 1.1 - H × 10 -4
Where: H—altitude above sea level of the installation site, m, A2 Cable accessories shall be tested together with the cable after installation, and the test requirements shall be consistent with the cable regulations, 6
Standard of the People's Republic of China
Mechanical Industry Standard
Basic Technical Requirements for Power Cable Accessories with Rated Voltage of 26/35kV and Below
General Provisions
JB/T 8144.1-1995
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Format 880×1230bZxz.net
Edition X, XX, 19XX
Print runs 1-XXX
Postal code 100044)
Printed sheets X/X
Number of words XXX,XXX
Print runs X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standards Service Network: http://www.JB.ac.cn66_81-1995
In the ambient temperature range of 10 to 30, the short-circuit performance test is carried out on the fully installed cable accessory samples. The short-circuit thermal stability test has a minimum short-circuit time of 1s. Considering the equipment capacity, the short-circuit time can be extended, but the current value shall not be less than 10kA (effective value). Each sample is short-circuited twice. After the first short-circuit test, the sample needs to be cooled to room temperature before the second test. Single-phase cable accessories adopt single-phase test, three-core cable accessories can also adopt single-phase test, each phase shall be tested twice, short-circuit dynamic stability test shall be carried out once for each sample, short-circuit time shall be 3 to 10 half cycles, waveform and amplitude shall be observed with oscilloscope, single-phase test shall be adopted for single-core cable accessories, three-phase test shall be adopted for three-core cable accessories, short-circuit test method is under consideration,
1s short-circuit thermal stability current shall comply with the provisions of Table 1, 1s short-circuit thermal stability current shall be calculated according to formula (3), Table 1
Cable structure and rated voltage
Cable insulation type
XLPE, EPR
Turnkey insulated cable 0.6/ 1~3.6/6
Turnkey insulated cable6/10~8.7/10
0.6/1~3.6/6
Single-core, three-core split-phase screen6/10~8.7/10
Shielded and split-phase lead sheathed cable
Single-core and multi-core
0.6/1~6/10
18/30~26/35
Cross-sectional area ≤300mm2
Cross-sectional area>300mm2
Single-core and multi-core cable0.6/1~26/35
Single-core and multi-core cable0.6/1~26/35||tt ||Before short circuit
Conductor temperature
Conductor during short circuit
Highest temperature
1s short circuit thermal stability current density
Copper conductor
119(108)
121(119)
119(108)
120(115)
143(100)
Note: ①For conductors connected by brazing, the short circuit temperature must not exceed 160℃, and the 1s short circuit thermal stability current density is the value in brackets. ②The abbreviations of cable insulation types are as follows: PILC-
-Oil-paper insulation Insulation; PVC-
acrylic rubber insulation,
polyvinyl chloride insulation; PE
polyethylene insulation; XLPE
cross-linked polyethylene insulation; EPR--Z
When the conductor temperature before short circuit is not the value specified in the table, the 1s short circuit thermal stability current density can be calculated by the following formula: Copper conductor:
Aluminum conductor:
Where: Jca
Jcu=226.2Kc
JAI=147.37KA1
234.45+Ts2
234.45+Tsi
228.14 + Ts2
228.14+Tsi
-1s short-circuit thermal stability current density of copper conductor, A/mm\; -1s short-circuit thermal stability current density of aluminum conductor, A/mm2; temperature of conductor before short circuit, ℃;
highest temperature of conductor during short circuit, annihilation,
The short-circuit thermal stability current when the short-circuit time is 1 can be calculated by formula (3): It
JB/T8144.1-1995
Where: I——short-circuit thermal stability current when the short-circuit time is 1, A; I——1s short-circuit thermal stability current, A;
tshort-circuit time, s.
5.10 Radio interference test
The radio interference test method is under consideration. 5.11 Mechanical strength test
The mechanical strength test shall be carried out on the fully assembled factory-made cable terminal box or joint box sample. The sample shall be subjected to the specified water pressure or oil pressure and maintained under the specified pressure for a certain period of time. 5.12 Cable accessories conductor connection joint test The performance test of cable joints and terminal head conductor connection joints shall be carried out in accordance with GB9327. 6 Product marking, packaging, transportation and storage 6.1 Product marking
Each cable accessory product leaving the factory must be marked with obvious permanent markings, and the marking contents are as follows: a.
Manufacturer name;
b, product model and name;
c. Rated voltage;
d. Conductor cross section;
e. Date of manufacture and serial number;
f. Validity period (for certain materials or components);
For certain cable accessories (such as wrapped type, heat shrink type, cast type, etc.), the factory only provides materials or components, and they become complete cable accessories through on-site production. For such cable accessories, in addition to the corresponding marks on the materials or components when they leave the factory, the manufacturer should also attach marks in the supporting materials that can be fixed by users in obvious positions on the cable accessories after the cable accessories are installed. 6.2 Product packaging
6.2.1 The packaging method of cable accessories depends on the characteristics of the product, but there must be corresponding waterproof and sealing measures for insulating parts, conductive parts, insulating materials, etc., and there must be corresponding anti-pressure and anti-impact packaging measures for fragile and pressure-sensitive parts or materials, and the corresponding words or marks shall be printed in obvious positions on the outside of the packaging. All flammable parts or materials shall have fire prevention marks. 6.2.2 The product packaging should be accompanied by a complete list of all installation parts and materials. 6.2.3 The factory packaging of cable accessories must be accompanied by installation instructions and structural diagrams. The instructions should specify the following: product model, specifications, applicable places (such as indoors or outdoors; general environment or harsh environment, etc.); a.
Rated voltage used;
Type, model and cross-section of the cable to be used. 6.3 Product transportation
The transportation requirements of cable accessories should be determined according to the characteristics of various cable accessories. 6.3.1 Insulating parts, conductive parts, and insulating materials (such as insulating tapes and insulating agents) must be protected from rain and direct sunlight during transportation. 6.3.2 Fragile insulating parts such as porcelain and glass should be protected from strong vibration and impact during transportation and loading and unloading. 6.3.3 Flammable materials (such as insulating tapes and insulating agents) should be transported in accordance with relevant national regulations. 6.4 Product Purchase and Storage
Storage requirements for cable accessories should be determined according to the characteristics of various cable accessories. 6.4.1 Insulating components and insulating materials of organic materials must be stored in dry and ventilated warehouses with room temperature not exceeding 35°C. 6.4.2 Flammable materials (such as insulating tapes and insulating agents) should be stored in warehouses with fire prevention measures. Cable accessories that have been stored for longer than the period specified in the corresponding product standards should be removed from the warehouse and shall not be issued as qualified products. 6.4.3
JB/T8144.1-1995
Appendix A
Application Guide
(Reference)
A1 When the cable terminal is used in areas with an altitude higher than 1000m, the test voltage shall be the withstand voltage specified in the standard multiplied by the altitude correction factor K:
ca = 1.1 - H × 10 -4
Where: H—altitude above sea level of the installation site, m, A2 Cable accessories shall be tested together with the cable after installation, and the test requirements shall be consistent with the cable regulations, 6
Standard of the People's Republic of China
Mechanical Industry Standard
Basic Technical Requirements for Power Cable Accessories with Rated Voltage of 26/35kV and Below
General Provisions
JB/T 8144.1-1995
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Print runs 1-XXX
Postal code 100044)
Printed sheets X/X
Number of words XXX,XXX
Print runs X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standards Service Network: http://www.JB.ac.cn66_81-1995
In the ambient temperature range of 10 to 30, the short-circuit performance test is carried out on the fully installed cable accessory samples. The short-circuit thermal stability test has a minimum short-circuit time of 1s. Considering the equipment capacity, the short-circuit time can be extended, but the current value shall not be less than 10kA (effective value). Each sample is short-circuited twice. After the first short-circuit test, the sample needs to be cooled to room temperature before the second test. Single-phase cable accessories adopt single-phase test, three-core cable accessories can also adopt single-phase test, each phase shall be tested twice, short-circuit dynamic stability test shall be carried out once for each sample, short-circuit time shall be 3 to 10 half cycles, waveform and amplitude shall be observed with oscilloscope, single-phase test shall be adopted for single-core cable accessories, three-phase test shall be adopted for three-core cable accessories, short-circuit test method is under consideration,
1s short-circuit thermal stability current shall comply with the provisions of Table 1, 1s short-circuit thermal stability current shall be calculated according to formula (3), Table 1
Cable structure and rated voltage
Cable insulation type
XLPE, EPR
Turnkey insulated cable 0.6/ 1~3.6/6
Turnkey insulated cable6/10~8.7/10
0.6/1~3.6/6
Single-core, three-core split-phase screen6/10~8.7/10
Shielded and split-phase lead sheathed cable
Single-core and multi-core
0.6/1~6/10
18/30~26/35
Cross-sectional area ≤300mm2
Cross-sectional area>300mm2
Single-core and multi-core cable0.6/1~26/35
Single-core and multi-core cable0.6/1~26/35||tt ||Before short circuit
Conductor temperature
Conductor during short circuit
Highest temperature
1s short circuit thermal stability current density
Copper conductor
119(108)
121(119)
119(108)
120(115)
143(100)
Note: ①For conductors connected by brazing, the short circuit temperature must not exceed 160℃, and the 1s short circuit thermal stability current density is the value in brackets. ②The abbreviations of cable insulation types are as follows: PILC-
-Oil-paper insulation Insulation; PVC-
acrylic rubber insulation,
polyvinyl chloride insulation; PE
polyethylene insulation; XLPE
cross-linked polyethylene insulation; EPR--Z
When the conductor temperature before short circuit is not the value specified in the table, the 1s short circuit thermal stability current density can be calculated by the following formula: Copper conductor:
Aluminum conductor:
Where: Jca
Jcu=226.2Kc
JAI=147.37KA1
234.45+Ts2
234.45+Tsi
228.14 + Ts2
228.14+Tsi
-1s short-circuit thermal stability current density of copper conductor, A/mm\; -1s short-circuit thermal stability current density of aluminum conductor, A/mm2; temperature of conductor before short circuit, ℃;
highest temperature of conductor during short circuit, annihilation,
The short-circuit thermal stability current when the short-circuit time is 1 can be calculated by formula (3): It
JB/T8144.1-1995
Where: I——short-circuit thermal stability current when the short-circuit time is 1, A; I——1s short-circuit thermal stability current, A;
tshort-circuit time, s.
5.10 Radio interference test
The radio interference test method is under consideration. 5.11 Mechanical strength test
The mechanical strength test shall be carried out on the fully assembled factory-made cable terminal box or joint box sample. The sample shall be subjected to the specified water pressure or oil pressure and maintained under the specified pressure for a certain period of time. 5.12 Cable accessories conductor connection joint test The performance test of cable joints and terminal head conductor connection joints shall be carried out in accordance with GB9327. 6 Product marking, packaging, transportation and storage 6.1 Product marking
Each cable accessory product leaving the factory must be marked with obvious permanent markings, and the marking contents are as follows: a.
Manufacturer name;
b, product model and name;
c. Rated voltage;
d. Conductor cross section;
e. Date of manufacture and serial number;
f. Validity period (for certain materials or components);
For certain cable accessories (such as wrapped type, heat shrink type, cast type, etc.), the factory only provides materials or components, and they become complete cable accessories through on-site production. For such cable accessories, in addition to the corresponding marks on the materials or components when they leave the factory, the manufacturer should also attach marks in the supporting materials that can be fixed by users in obvious positions on the cable accessories after the cable accessories are installed. 6.2 Product packaging
6.2.1 The packaging method of cable accessories depends on the characteristics of the product, but there must be corresponding waterproof and sealing measures for insulating parts, conductive parts, insulating materials, etc., and there must be corresponding anti-pressure and anti-impact packaging measures for fragile and pressure-sensitive parts or materials, and the corresponding words or marks shall be printed in obvious positions on the outside of the packaging. All flammable parts or materials shall have fire prevention marks. 6.2.2 The product packaging should be accompanied by a complete list of all installation parts and materials. 6.2.3 The factory packaging of cable accessories must be accompanied by installation instructions and structural diagrams. The instructions should specify the following: product model, specifications, applicable places (such as indoors or outdoors; general environment or harsh environment, etc.); a.
Rated voltage used;
Type, model and cross-section of the cable to be used. 6.3 Product transportation
The transportation requirements of cable accessories should be determined according to the characteristics of various cable accessories. 6.3.1 Insulating parts, conductive parts, and insulating materials (such as insulating tapes and insulating agents) must be protected from rain and direct sunlight during transportation. 6.3.2 Fragile insulating parts such as porcelain and glass should be protected from strong vibration and impact during transportation and loading and unloading. 6.3.3 Flammable materials (such as insulating tapes and insulating agents) should be transported in accordance with relevant national regulations. 6.4 Product Purchase and Storage
Storage requirements for cable accessories should be determined according to the characteristics of various cable accessories. 6.4.1 Insulating parts and insulating materials of organic materials must be stored in dry and ventilated warehouses with room temperature not exceeding 35°C. 6.4.2 Flammable materials (such as insulating tapes and insulating agents) should be stored in warehouses with fire prevention measures. Cable accessories that have been stored for longer than the period specified in the corresponding product standards should be removed from the warehouse and shall not be issued as qualified products. 6.4.3
JB/T8144.1-1995
Appendix A
Application Guide
(Reference)
A1 When the cable terminal is used in areas with an altitude higher than 1000m, the test voltage shall be the withstand voltage specified in the standard multiplied by the altitude correction factor K:
ca = 1.1 - H × 10 -4
Where: H—altitude above sea level of the installation site, m, A2 Cable accessories shall be tested together with the cable after installation, and the test requirements shall be consistent with the cable regulations, 6
Standard of the People's Republic of China
Mechanical Industry Standard
Basic Technical Requirements for Power Cable Accessories with Rated Voltage of 26/35kV and Below
General Provisions
JB/T 8144.1-1995
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Print runs 1-XXX
Postal code 100044)
Printed sheets X/X
Number of words XXX,XXX
Print runs X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standards Service Network: http://www.JB.ac.cn66_86/6
Single-core, three-core split-phase screen 6/10~8.7/10
Shielded and split-phase lead sheathed cable
Single-core and multi-core
0.6/1~6/10
18/30~26/35
Cross-sectional area ≤300mm2
Cross-sectional area>300mm2
Single-core and multi-core cable 0.6/1~26/35
Single Core and multi-core cable 0.6/1~26/35
Before short circuit
Conductor temperature
Conductor during short circuit
Maximum temperature
1s short circuit thermal stability current density
Copper conductor
119(108)
121(119)
119(108)
120(115)
143(1 00)
Note: ① For conductors connected by brazing, the short-circuit temperature must not exceed 160℃, and the 1s short-circuit thermal stability current density is the value in brackets. ② The abbreviations of cable insulation types are as follows: PILC-
oil-paper insulation; PVC-
acrylic rubber insulation,
polyvinyl chloride insulation; PE
polyethylene insulation; XLPE
cross-linked polyethylene insulation; EP R--Z
When the conductor temperature before short circuit is not the specified value in the table, the 1s short circuit thermal stability current density can be calculated by the following formula: Copper conductor:
Aluminum conductor:
Wherein: Jca
Jcu=226.2Kc
JAI=147.37KA1
234.45+Ts2
234.45+Tsi
228.14 + Ts2
228.14+Tsi
-1s short-circuit thermal stability current density of copper conductor, A/mm\; -1s short-circuit thermal stability current density of aluminum conductor, A/mm2; temperature of conductor before short circuit, ℃;
highest temperature of conductor during short circuit, annihilation,
The short-circuit thermal stability current when the short-circuit time is 1 can be calculated by formula (3): It
JB/T8144.1-1995
Where: I——short-circuit thermal stability current when the short-circuit time is 1, A; I——1s short-circuit thermal stability current, A;
tshort-circuit time, s.
5.10 Radio interference test
The radio interference test method is under consideration. 5.11 Mechanical strength test
The mechanical strength test shall be carried out on the fully assembled factory-made cable terminal box or joint box sample. The sample shall be subjected to the specified water pressure or oil pressure and maintained under the specified pressure for a certain period of time. 5.12 Cable accessories conductor connection joint test The performance test of cable joints and terminal head conductor connection joints shall be carried out in accordance with GB9327. 6 Product marking, packaging, transportation and storage 6.1 Product marking
Each cable accessory product leaving the factory must be marked with obvious permanent markings. The marking contents are as follows: a.
Manufacturer name;
b, product model and name;
c. Rated voltage;
d. Conductor cross section;
e. Date of manufacture and serial number;
f. Validity period (for certain materials or components);
For certain cable accessories (such as wrapped type, heat shrink type, cast type, etc.), the factory only provides materials or components, and they become complete cable accessories through on-site production. For such cable accessories, in addition to the corresponding marks on the materials or components when they leave the factory, the manufacturer should also attach marks in the supporting materials that can be fixed by users in obvious positions on the cable accessories after the cable accessories are installed. 6.2 Product packaging
6.2.1 The packaging method of cable accessories depends on the characteristics of the product, but there must be corresponding waterproof and sealing measures for insulating parts, conductive parts, insulating materials, etc., and there must be corresponding anti-pressure and anti-impact packaging measures for fragile and pressure-sensitive parts or materials, and the corresponding words or marks shall be printed in obvious positions on the outside of the packaging. All flammable parts or materials shall have fire prevention marks. 6.2.2 The product packaging should be accompanied by a complete list of all installation parts and materials. 6.2.3 The factory packaging of cable accessories must be accompanied by installation instructions and structural diagrams. The instructions should specify the following: product model, specifications, applicable places (such as indoors or outdoors; general environment or harsh environment, etc.); a.
Rated voltage used;
Type, model and cross-section of the cable to be used. 6.3 Product transportation
The transportation requirements of cable accessories should be determined according to the characteristics of various cable accessories. 6.3.1 Insulating parts, conductive parts, and insulating materials (such as insulating tapes and insulating agents) must be protected from rain and direct sunlight during transportation. 6.3.2 Fragile insulating parts such as porcelain and glass should be protected from strong vibration and impact during transportation and loading and unloading. 6.3.3 Flammable materials (such as insulating tapes and insulating agents) should be transported in accordance with relevant national regulations. 6.4 Product Purchase and Storage
Storage requirements for cable accessories should be determined according to the characteristics of various cable accessories. 6.4.1 Insulating components and insulating materials of organic materials must be stored in dry and ventilated warehouses with room temperature not exceeding 35°C. 6.4.2 Flammable materials (such as insulating tapes and insulating agents) should be stored in warehouses with fire prevention measures. Cable accessories that have been stored for longer than the period specified in the corresponding product standards should be removed from the warehouse and shall not be issued as qualified products. 6.4.3
JB/T8144.1-1995
Appendix A
Application Guide
(Reference)
A1 When the cable terminal is used in areas with an altitude higher than 1000m, the test voltage shall be the withstand voltage specified in the standard multiplied by the altitude correction factor K:
ca = 1.1 - H × 10 -4
Where: H—altitude above sea level of the installation site, m, A2 Cable accessories shall be tested together with the cable after installation, and the test requirements shall be consistent with the cable regulations, 6
Standard of the People's Republic of China
Mechanical Industry Standard
Basic Technical Requirements for Power Cable Accessories with Rated Voltage of 26/35kV and Below
General Provisions
JB/T 8144.1-1995
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Print runs 1-XXX
Postal code 100044)
Printed sheets X/X
Number of words XXX,XXX
Print runs X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standards Service Network: http://www.JB.ac.cn66_86/6
Single-core, three-core split-phase screen 6/10~8.7/10
Shielded and split-phase lead sheathed cable
Single-core and multi-core
0.6/1~6/10
18/30~26/35
Cross-sectional area ≤300mm2
Cross-sectional area>300mm2
Single-core and multi-core cable 0.6/1~26/35
Single Core and multi-core cable 0.6/1~26/35
Before short circuit
Conductor temperature
Conductor during short circuit
Maximum temperature
1s short circuit thermal stability current density
Copper conductor
119(108)
121(119)
119(108)
120(115)
143(1 00)
Note: ① For conductors connected by brazing, the short-circuit temperature must not exceed 160℃, and the 1s short-circuit thermal stability current density is the value in brackets. ② The abbreviations of cable insulation types are as follows: PILC-
oil-paper insulation; PVC-
acrylic rubber insulation,
polyvinyl chloride insulation; PE
polyethylene insulation; XLPE
cross-linked polyethylene insulation; EP R--Z
When the conductor temperature before short circuit is not the specified value in the table, the 1s short circuit thermal stability current density can be calculated by the following formula: Copper conductor:
Aluminum conductor:
Wherein: Jca
Jcu=226.2Kc
JAI=147.37KA1
234.45+Ts2
234.45+Tsi
228.14 + Ts2
228.14+Tsi
-1s short-circuit thermal stability current density of copper conductor, A/mm\; -1s short-circuit thermal stability current density of aluminum conductor, A/mm2; temperature of conductor before short circuit, ℃;
highest temperature of conductor during short circuit, annihilation,
The short-circuit thermal stability current when the short-circuit time is 1 can be calculated by formula (3): It
JB/T8144.1-1995
Where: I——short-circuit thermal stability current when the short-circuit time is 1, A; I——1s short-circuit thermal stability current, A;
tshort-circuit time, s.
5.10 Radio interference test
The radio interference test method is under consideration. 5.11 Mechanical strength test
The mechanical strength test shall be carried out on the fully assembled factory-made cable terminal box or joint box sample. The sample shall be subjected to the specified water pressure or oil pressure and maintained under the specified pressure for a certain period of time. 5.12 Cable accessories conductor connection joint test The performance test of cable joints and terminal head conductor connection joints shall be carried out in accordance with GB9327. 6 Product marking, packaging, transportation and storage 6.1 Product marking
Each cable accessory product leaving the factory must be marked with obvious permanent markings, and the marking contents are as follows: a.
Manufacturer name;
b, product model and name;
c. Rated voltage;
d. Conductor cross section;
e. Date of manufacture and serial number;
f. Validity period (for certain materials or components);
For certain cable accessories (such as wrapped type, heat shrink type, cast type, etc.), the factory only provides materials or components, and they become complete cable accessories through on-site production. For such cable accessories, in addition to the corresponding marks on the materials or components when they leave the factory, the manufacturer should also attach marks in the supporting materials that can be fixed by users in obvious positions on the cable accessories after the cable accessories are installed. 6.2 Product packaging
6.2.1 The packaging method of cable accessories depends on the characteristics of the product, but there must be corresponding waterproof and sealing measures for insulating parts, conductive parts, insulating materials, etc., and there must be corresponding anti-pressure and anti-impact packaging measures for fragile and pressure-sensitive parts or materials, and the corresponding words or marks shall be printed in obvious positions on the outside of the packaging. All flammable parts or materials shall have fire prevention marks. 6.2.2 The product packaging should be accompanied
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