The split structure of the electric actuator (commonly known as the ordinary type) is that the control unit is separated from the electric actuator. The electric actuator cannot control the electric valve alone. The control unit must be added to achieve the control. Generally, a controller or a control cabinet is used outside Form supporting. The disadvantages of this structure are that it is not convenient for the overall installation of the system, increases wiring and installation costs, and is prone to failures. When a failure occurs, it is not easy to diagnose and maintain, and the cost performance is not ideal.
Structure, composition, function and scope of application of indoor high voltage vacuum circuit breaker?
Vacuum circuit breaker general users in the medium voltage field (3 ~ 63kV). In the past, vacuum circuit breakers were split (such as ZN28A-12, which was widely used). The circuit breaker body includes: rack, vacuum bubble, insulation rod, insulator, conductive clip, soft connection, main shaft, etc. The mechanism for operating the vacuum circuit breaker needs to be equipped separately, including electromagnetic type and spring energy storage type. The mechanism and the body are connected by a connecting rod. Such circuit breakers are now rarely used. The current main vacuum circuit breakers are integrated. In addition to the above body part, there is also a mechanism part (as an integrated mechanism, generally a spring energy storage type and a permanent magnet type), and also includes a circuit board and an overcurrent coil installed in the mechanism. The indoor high voltage vacuum circuit breaker is a component used to switch on and off the power supply; it can switch on and off the short-circuit current, but because the electrical life is shorter than that of a vacuum contactor, it is generally used in occasions where it is not frequently operated.
