JB/T 7104-1993 General technical requirements for electrical connectors for relays and their devices
Some standard content:
Mechanical Industry Standard of the People's Republic of China
General Technical Conditions for Electrical Connectors for Relays and Their Devices 1 Subject Content and Scope of Application
JB/T7104-93
This standard specifies the environmental conditions, technical requirements, test methods and inspection rules for electrical connectors for relays and their devices. This standard applies to various general electrical connectors used to achieve electrical connections in relays, relay protection and safety automatic devices, such as terminals, terminal blocks, connectors, etc. (hereinafter referred to as connectors), and special connectors can be implemented as a reference. 2 Reference standards
GB2900.17
GB4858
GB7261
ZBK45016
ZBK45020
JB4261
3 Terminology
Electrical terminology Relays and relay protection devices Insulation test of electrical relays
Electrical product fire hazard test Needle flame test method Relays and relay protection devices Basic test methods for relays and protection devices Electrical clearance and creepage distance General technical conditions for power system protection, automatic relays and devices Accessories of switchgear and control equipment Terminology The terms used in this standard shall comply with the provisions of GB2900.17 and JB4261. 4 Environmental conditions for use
4.1 Ambient temperature: -25~55℃.
4.2 Relative humidity; the average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is 25℃, and no condensation is formed on the connector. The highest temperature is 40℃, and the average maximum relative humidity does not exceed 50%. 4.3 Atmospheric pressure: 80~110kPa.
4.4 There shall be no danger of explosion, fire, etc. in the place of use. There shall be no corrosive gas, gas that destroys insulation and conductive medium in the surrounding medium, and it is not allowed to be filled with water vapor and have serious bacteria. 4.5 The place of use shall have measures to prevent wind, sand, rain and snow. 4.6 The severity level of vibration, impact and collision is level 1. 4.7 When the product has special requirements for connectors, the connectors shall meet these requirements and be indicated in the corresponding connector standards. 5 Structural requirements
5.1 The processing and assembly of connector parts shall comply with the requirements of the design drawings. 5.2 The design of connectors shall take into account the convenience of installation, wiring, use and maintenance. 5.3 The connectors shall have mechanical strength and rigidity that meet the requirements of use. 5.4 The electrical spacing and creepage distance of the connectors shall comply with the provisions of Chapter 4 of ZBK45016. The connectors shall be compatible, and the connectors of the same model shall be interchangeable in size and function. 5.5
Approved by the Ministry of Machinery Industry on October 8, 1993
Implementation on January 1, 1994
JB/T 7104-93
5.6 The conductive parts of the connectors must be made of materials with excellent conductive properties and have anti-corrosion coatings, but the conductive contact parts shall not be electrolessly nickel-plated to ensure low contact resistance. The insulating parts of the connectors may be made of thermosetting or thermoplastic engineering plastics and shall be flame retardant.
5.7 The electrical connection methods of the connectors may be brazing, cold pressing, wrapping, plugging and nut connection. 5.8 The surface of the electrical insulation of the connector shall not have defects such as cracks, shrinkage holes, convex and concave, and the burrs at the gate and mold joints shall be removed. 5.9 The surface of the metal structure of the connector shall be flat and smooth, without burrs, cracks and other defects. 5.10 The fasteners should be screwed in and out freely, reliable after tightening, and have a certain self-locking ability. 5.11 The electrical connection of the connector should be reasonably configured and the contact should be reliable. 5.12 Other structural requirements of the connector should be specified in the corresponding product standards. 6 Technical requirements
6.1 The extreme range of ambient temperature is -25℃ and 70℃. 6.2 The rated voltage and rated current are specified by the corresponding product standards and are selected according to Article 4.3.1.2 of ZBK45020. 6.3 The cross-sectional area of the connecting wire is selected according to the following values: 0.5, 0.75, 1.0, 1.5, 2.5, 4, 6, 10, 16mm2. When the product design requires values other than those above, the corresponding product standards shall specify them. The long-term continuous allowable interception current of a single-laid copper-core insulated wire is shown in Appendix A.
6.4 Contact resistance of electrical connection
6.4.1 When the electrical connection method is brazing, winding and cold pressing, the contact resistance value should not be greater than 5ma. 6.4.2 When the electrical connection method is plug-in or threaded connection, the contact resistance should not be greater than 8mn. 6.4.3 When other electrical connection methods are used or the product has special requirements, the contact resistance value shall be specified by the corresponding product standards. 6.5 Dielectric strength
Under the standard test conditions specified in GB7261, the conductive part of the connector and the grounding frame or conductive base, as well as the different circuits of the conductive part, should be able to withstand the test voltage of 50Hz AC and the value specified in Table 1 for 1min, without insulation breakdown or flashover. Table 1
Rated voltage
60~250
250~380
6.6 Insulation resistance
Test voltage
Under the specified standard test atmospheric conditions, the insulation resistance between the conductive part of the connector and the grounding frame or conductive base, and between different circuits of the conductive part should be no less than 300Mα. The insulation resistance value after 2 cycles (48h) of the damp heat test should be no less than 4MQ. Note: The standard test atmospheric conditions are: ambient temperature 15~35C: relative humidity 45%~75%, atmospheric pressure 86~106kPa.6.7 Impulse voltage
6.7.1 The live conductive parts of the connectors should be able to withstand the short-term impulse test of lightning waves to the ground and between adjacent live parts. If flashover occurs during the test, it may not be used as a criterion for failure, but the insulation resistance and dielectric strength shall be rechecked at 75% of the dielectric strength test voltage, and the insulation resistance value shall comply with the provisions of Article 6.6.
6.7.2 For connectors directly connected to the power transformer, the peak value of the impulse voltage is 5kV; for connectors not directly connected to the power transformer, the peak value of the impulse voltage is 1kV. The waveform shall comply with the provisions of Article 6.2 of GB4858. 6.8 Thermal stability requirements
For connectors used in current circuits, when subjected to a test of 40 times the rated current but not more than 250A for 1s, the insulation parts shall not be damaged, the structural parts shall not be deformed, and the insulation performance and use functions shall still comply with the requirements specified in Articles 6.4 to 6.6 of this standard. 6.9 Vibration, impact and collision
JB/T7104-93
When using connectors, they shall meet the vibration, impact and collision requirements of severity level 1. After the test, the structure should not be damaged, the fastening connections should not be loose, and the contact resistance value of the electrical connection can still meet the requirements of Article 6.4 of this standard. 6.10 Life
For connectors with mechanical mechanisms (such as plug-in type), their mechanical life should be able to withstand no less than 500 action tests. After the test
, they can still meet the expected functional requirements, and their contact resistance value meets the requirements of Article 6.4 of this standard. 6.11 Wire pull-off force
After the terminal of the connector is connected to the wire, while meeting the requirements of Article 6.4 of this standard, it should also be able to withstand the tension specified in Table 2 slowly applied along the wire axis for 1 minute, and the wire shall not loosen or fall out. Table
Wire cross-sectional area
The wire pull-off force of the winding form should be greater than the value specified in Table 3. Table 3
Wire diameter
Test method and inspection rules
Minimum pull-off force
Connector tests are divided into three types: type test, factory test and type test. Their definitions are the same as those in Articles 7.1, 7.2 and 7.4 of ZBK45020.
Inspection and testing of connectors shall be carried out in accordance with the requirements and methods specified in Table 4. Table
Structural requirements
Dimensions and structure
Compatibility inspection
Fire hazard test of engineering plastics
Acid and creepage distance
Contact resistance
Type test Factory test Type test
According to the standard
Article 5.6
Articles 5.1~5.3,5.5,5.8~5.10
Article 5.1,5.8~5.10
Article 5.5
Article 5.6
Article 5.4 and Chapter 4 of ZBK45061
Articles 6.4,6.9,6.10 items
Inspection test method
After destroying the coating, inspect according to the drawing
GB7261 Chapter 4
According to the design requirements
ZBK45016
Direct measurement with milliohmmeter
Dielectric strength
Insulation resistance
Impulse voltage
Thermal stability
Report , impact, collision
Mechanical life
Wire pull-out force
10 Extreme range of ambient temperature
Note, 1) It is a random inspection,
7.3 Sampling
JB/T7104—93
Continued Table 4
Type test Factory test Type test
7.3.1 The sampling plan for factory test is specified by the product standard. A
Based on the standard
Article 6.5
Article 6.6
Article 6.7
Article 6.8
Article 6.9
Article 6.10
Article 6.11
Article 6.1
Inspection test method
GR4858 Chapter 3
GB4858 Chapter 3
GB7261 Chapter 21
GB 7261, No. 20.4.3
GB4858, No. 6.2
GB7261, No. 23.1~
GB7261, No. 16~18
Test rate 360 times/h,
Maintenance and adjustment shall not be carried out during the test
Test with a 500g
spring tensioner according to Article 6.11. For winding
, a special pull-off
testing device
GB7261, Chapter 22
7.3.2 The sampling plan for type test and type test and the qualified quality level (AQL) shall be specified by the product standard. The type test cycle is 4 years. 8 Marking, packaging, storage and transportation
8.1 If the connector is used as a commodity, it shall have a model number and be marked on the connector or its packaging. 8.2 The product packaging of connectors shall meet the requirements of rainproof, moistureproof, shockproof and transportation, and shall have the model, name, batch number and transportation mark.
8.3 Connectors shall be stored in an environment without sandstorm, rain or snow, with an ambient temperature not lower than 20℃ and not higher than 40℃, and shall be dustproof, moistureproof and shockproof.
8.4 During transportation, avoid holding, bumping, squeezing and pressing, which may damage the appearance and performance of the product. 8.5 The marking, packaging, storage and transportation of connectors for self-use shall be specified by the product standards. 78
Nominal cross-sectional area
JB/T7104-93
Appendix A
Long-term continuous allowable current carrying capacity of single copper core insulated wire (reference)
PVC insulated wirebZxz.net
Only two types of ambient temperature are listed: 25C and 40C; Note:?
The maximum allowable operating temperature of the wire core is 65℃; the corresponding wire surface temperature is 60~61℃. Additional notes:
This standard is proposed and managed by Xuchang Relay Research Institute of the Ministry of Machinery Industry. This standard is drafted by Xuchang Relay Research Institute of the Ministry of Machinery Industry. The main drafter of this standard is Tian.
Rubber insulated wire
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