Differences Between Electrical Control And Protection Switches And Sf6 Circuit Breaker Operating Mechanisms
a. The ASKK1 series control and protection switch with control and protection self-matching features integrates control and protection functions, which is equivalent to circuit breaker (fuse) + contactor + overload relay + auxiliary electrical appliances. It solves the problem of matching protection and control characteristics between components that cannot or is difficult to solve with separation components, making the protection and control characteristics more perfect and reasonable (with three-stage protection characteristics of inverse time, fixed time and instantaneous). As long as a single product is correctly selected according to the load power or current, it can replace various electrical appliances from the power supply line end to the load end without reducing the capacity; it greatly reduces the workload of designers.
b. With unparalleled operational reliability and continuous operation performance of the system, the ASKK1 control and protection switch can be put into use without maintenance after breaking the short-circuit current, that is, it has continuous operation performance after breaking the short-circuit fault: After the ASKK1 control and protection switch has been tested for breaking the short-circuit current, it still has an AC-44 electrical life of not less than 1500 times, which is difficult to achieve for systems composed of separation components such as sf6 circuit breaker operating mechanism. This feature of KBO greatly improves the operational reliability and continuous operation of the system. Among them, the Ics of 80kA is the international leading indicator of similar products and the highest indicator in China.
c. Energy saving and material saving The ASKK1 control and protection switch has the advantages of small size, small installation area, no separation component contacts, reduced line heating, energy saving, and material saving.
◇ Compared with sf6 circuit breaker spring mechanism a. It has the characteristics of high breaking capacity and short arcing distance. The rated operating short-circuit breaking capacity Ics (o-co-co) of ASKK1 control and protection switch at 380V reaches 80kA for high breaking type, 50kA for standard type and 35kA for economic type. The breaking time is only 2-3ms under the expected short-circuit current of 50kA, and the current limiting coefficient is below 0.2, reaching the leading level of molded case circuit breakers and the current limiting level of fuses, which greatly limits the dynamic thermal impact of short-circuit current on the system. The arcing distance of ASKK1 control and protection switch is only 20-30mm.
