【Summary description】 Circular connector plays a key role in the equipment, but many customers do not understand its safety, which leads to some unexpected accidents. There are many factors related to the circular connector, such as the external insulation resistance, internal conductivity and so on.

Circular connector plays a key role in the equipment, but many customers do not understand its safety, which leads to some unexpected accidents. There are many factors related to the circular connector, such as the external insulation resistance, internal conductivity and so on.

The first is the external insulation resistance, that is, the resistance value presented by applying voltage to the insulation part of the circular connector so as to produce leakage current inside or on the surface of the insulating part. It is mainly affected by insulation material, temperature, humidity, contamination and other factors. In addition, pay attention to the test voltage value of insulation resistance. According to the insulation resistance (m Ω) = the voltage (V) / leakage current (μ a) applied to the insulator, different voltages are applied, and different results will be obtained. In the test of connector, the applied voltage is generally 10V, 100V and 500V. Another point is to improve the safety of external packaging materials, add environmental resistant materials for reliable guarantee, so that in the process of transmission, there can be a good guarantee service.

The second is the conductivity of the main internal conductor, which is as important as the insulation of the external material. Only when the two aspects are at the highest end, can the operation itself be safer and achieve a better effect. In particular, the advantages of circular connector products can be brought into full play, so that the production can be more effective. In order to ensure the reliability of circular connector, practitioners of circular connector industry must master the following related theoretical knowledge.

1、 Heating theory of electrical appliances

In addition to the dielectric loss is the heat source, the heating of electrical appliances is mainly the current effect of the current carrying conductor. Under the large current and strong alternating magnetic field, not only the huge electrodynamic force, but also the skin effect and proximity effect are produced between the carrier fluids. The uneven distribution of the current lines of the carrier fluid will directly affect the heating and temperature rise.

2、 Electrical contact theory

The theory of electrical contact covers a wide range. The physical and chemical processes of contact include various effects such as heat, electricity, magnetism and semiconductors, the physical nature and calculation of contact resistance, the temperature field of contact point, the thermoelectric potential of contact point and its influence on metal migration, the theory and calculation of metal bridge, the physical process and mathematics of heat and mass transfer between contacts Model, etc. Holm has made great contributions to the theory of electrical contact. His great book electrical contact summarizes his research experience for decades. In order to commemorate him, Holm electrical contact society has been established internationally. There are corresponding annual meetings in major countries. In China, there are Beijing University of Posts and telecommunications, Fuzhou University, Guizhou University and other aspects of electrical contact research.

3、 Arc theory

The electric connector with hot plug is related to the arc problem. The arc theory includes the theory of how to start and extinguish the arc when the contact is separated, the process of gas discharge and excitation, the boundary and process of spark discharge, glow discharge and arc discharge, the process of ion balance and ionization and deionization, the theory of pole side and arc column, the heat accumulation of residual current, the process of electric breakdown and thermal breakdown, and the static state of arc State and dynamic characteristics, arc energy and overvoltage, etc.