The terminal blocks requirements of the power industry26.03.2014

With the beginning of the 3C certification, the national electrical products safety, electromagnetic compatibility requirements of a higher demand, which related to the safety of items including: mechanical structure, enclosure protection, insulation coordination, fever, fire tests, anti- electric shock, safety signs and safety instructions.

1, Mechanical hazard terminals in the chemistry and structure of materials and live moving parts

to ensure personal safety, such as the shell edges, metal burrs, and parts of the connection strength, even in the conditions of exercise and other products the stability of the above are the power industry requirements of the mechanical structure of the terminal.

2, Shell protection requirements the requirements of protection class, it is mainly divided into two,one is the level of protection of solid foreign objects, one is the harm caused by the water, equipment and products.

3, Insulation coordination requires is mainly based on the materials used, the operating voltage and environmental pollution level, reasonable selection of clearances and creepage distances to protect the safety of staff and the products work, but also the products in the voltage does not occur to damage to the insulation .

4, the requirements of the tracking index, product during use due to the surface of the solid insulating materials under the action of the electric field and the electrolyte to form a conductive path, so that the shell of insulating material insulation performance, affect the safety of the product. Conditions of the same insulation voltage level, the tracking index (CTI), the creepage distance can be reduced.

    5, Thermoplastic material on the deformation in the work requirements, mainly on the terminal temperature rise at work, and contact resistance, high temperature that causes the deformation of the casing softened, so that the electrical short circuit, resulting in a serious accident, so the terminals contained flow component materials selection is very important.

6, Electric shock requirements, operating in the structure of the components should not be charged with the internal connection terminals should not be accessible to the main requirements for the reliability of screw torque should be prevented and the screws of the terminals can be touched. wire accidental loosening and short circuit. Such as the ground terminal requirements: class Ⅰ safety grounding resistance should not be greater than 0.5Ω.

Power relay protection of the safety performance of some specific requirements, but specific to the requirements of Division I terminals are as follows:
    (A), the requirements of the plug-in terminals: plug the power for a smooth, not difficult to insert or plug into a certain number of contact resistance increases phenomenon, on this point is the point of the special requirements of power system relay protection , so the tablet have conductivity and elastic modulus of volume and tensile strength, metal surface corrosion resistance, flame retardant insulating materials and insulation class higher, there is: the amount of current, screw torque, anti-vibration, needle distance tolerance, appearance and other aspects.

(B) the requirements of the terminal on the fence: good appearance, safety performance is: creepage distances and clearances must meet the standards of protection of electrical equipment, screws corrosion resistance better. Clamping current-carrying parts temperature rise can not exceed 45K, long median terminal can not warpage, high-current requirements of the terminals on the thickness of the insulation shell structure and choice of materials.
    (C), the rail terminal: shell strength better resistance and then must meet UL94 V-0, not hard card or card product in the rail upper phenomenon, torque screws on the pressure line have a good appearance of the phenomenon, demanding, splicing a group of multi-chip terminals on the electrical parameters and identification must be clear mission, and accurate. Protection against electric shock and climb power distance and electrical gap between the terminals, and terminals, and other conductive parts must meet the relevant standards.

These are the requirements of the power industry customers to use our main three series of products mentioned.