Definition and function of three-phase knife switch
The three-phase knife switch, referred to as the knife switch, is an important switching equipment used in the power system. It is an important part of the circuit responsible for opening and closing. The main function is to ensure the safety protection of electrical equipment, personnel, etc. from electric shock when the circuit fails or is repaired.
Two, three phase knife switch material composition
The three-phase knife switch is mainly composed of four parts: operating mechanism, isolating blade, fixed contact and conductive material. Among them, the material types of isolating blade, fixed contact and conductive material are not the same. For example, under normal circumstances, the commonly used materials of the isolating blade are aluminum alloy, steel and copper, etc., the fixed contacts are made of metal materials such as silver cadmium alloy, and the conductive materials are selected as metal materials with good conductive properties.
Third, the material characteristics and advantages and disadvantages of the knife switch
1, isolation blade: Because the isolation blade in the switch operation, need to bear a large mechanical load, so the material requires high strength, high density, good rigidity. Copper material is a commonly used material, with good corrosion resistance, electrical conductivity and thermal conductivity.
2, fixed contact: The material of the fixed contact requires good electrical conductivity, small thermal expansion coefficient, high strength and good wear resistance. In the actual production application, the choice of silver-cadmium alloy as the material of the fixed contact can meet the above requirements.
3, conductive materials: conductive materials need to have good electrical conductivity and mechanical strength. Among them, copper is a commonly used conductive material, which has good electrical conductivity, good corrosion resistance and good processing plasticity.
Based on the above characteristics, the material used in the three-phase knife switch has the characteristics of high strength, good wear resistance, excellent electrical conductivity, etc., so it is widely used in various power systems.
(Conclusion)
This paper briefly describes the definition, function and material composition of the three phase knife switch, and elaborates the characteristics and advantages and disadvantages of the material. The use of copper alloy, silver cadmium alloy and other materials, can meet the switch's strength, electrical conductivity, thermal conductivity and other requirements
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