Difference between load switch and high voltage vacuum circuit breaker
Daily life is often applied to power switches, and power switches are divided into two categories: load switches and high-voltage vacuum circuit breakers, both of which can be connected to circuit power transformers and cut off circuit power transformers, but high-voltage vacuum circuit breakers have experienced overvoltage protection. The difference between the two is explained in detail below.
A load switch refers to a control electrical product with a simple magnetic blowing machine and equipment that can be divided and closed with a load. like FN7-12, FN5-12, FN18-12, 12KV LBS, 24KV LBS
It can conduct a certain load current and overload current, but cannot disconnect the short-circuit current. Try to connect it with the circuit breaker to use it, and use the isolating switch to cut off the short-circuit current. The technical professional solves the current (common problem current, rated current current), and the cable sheath level of the rupture surface of the high-voltage vacuum circuit breaker is very low, so the professional ability to solve the overvoltage is weak. The main power switch of the technical professional to solve the working standard voltage (the cable sheath level of the rupture surface is very high, which can solve the high compressive strength value of the rupture surface) is the knife switch, also known as the knife switch. The knife switch cannot solve all major problems. Current, rated current current and short-circuit current, can cut small current electrostatic field.
The high-voltage vacuum circuit breaker can connect and disconnect the circuit under load, and can quickly cut off the short-circuit current when the system causes a short-circuit fault. It can also automatically remove short-circuit faults and common faults under the action of maintaining machinery and equipment. It can solve the current (rated current and current), and can solve the working standard voltage (the level of the cable sheath on the rupture surface is higher than that of the high-voltage vacuum circuit breaker, but lower than that of the knife switch), but although the load switch can break and break the rated current and current, Break the short-circuit current, but it is strictly forbidden to break the short-circuit current. Since the load switch cannot break the short-circuit current, the disconnector should be modified as much as possible to provide remote reserve maintenance. Like VS1-12, 12KV VCB, 24KV VCB, 36KV VCB
Load switch - no maintenance (only with rated current load for the process of dividing the river) high voltage vacuum circuit breaker - with maintenance (except the above, it can break the safety production accident current) Knife switch - from isolation Function (cannot operate with load)
Isolation switch-maintenance electronic device (can cut off the current of safety production accident)
The important difference between knife switch and load switch
The high-voltage vacuum circuit breaker can cut off the working current and the safety production accident current.
The load switch can cut off the working current but cannot cut off the safety production accident current.
The knife switch cannot cut off any current. Reclosing only in case of no current.
From a traditional point of view, there is a big difference between a load switch and a knife switch.
The load switch is mainly used for breaking and breaking the load current. The load switch can be used in conjunction with the circuit breaker to replace the expensive high-voltage vacuum circuit breaker and cut off the common problem current, that is, the short-circuit current. In that case, it is also the management decision The magnetic blowing effect of the load switch is relatively weak, which reduces the manufacturing cost; it is precisely because the traditional load switch is not used to cut off the common problem current, it is not necessary to connect with the maintenance machinery and protection equipment, so most of the load The switch is a hand-pull operation process and cannot be operated electrically.
When the high-voltage vacuum circuit breaker is designed, it is considered that not only can it break and break the load current, but also can cut off the short-circuit current after common problems. It can be used for the combination and suction of the electric type and the electric motor. But from a modern point of view, especially the introduction of foreign expertise, the production and processing of load switches are more and more like high-voltage vacuum circuit breakers. Some load switches have improved the professional ability of magnetic blowing and improved the efficiency of electric operation.