Visible Safety Assurance: A Comprehensive Analysis Of The Vertical Pull-out High-voltage Disconnect Switch Structure
In the safe operation of power systems, the visibility of the disconnection point is the most direct safety guarantee for maintenance personnel. The design of the high voltage isolator fracture surface directly determines whether maintenance personnel can accurately judge the equipment status. The vertically pull-out high voltage isolator switch type refers to a type that forms a visible disconnection point in the vertical direction during operation. This structure allows maintenance personnel to clearly observe the opening and closing status from the ground, providing a clear visual isolation signal for line maintenance.
Vertical Disconnection Point Structure Design
A typical vertically pull-out hv isolator type adopts a single-disconnection vertical opening structure. The post insulators of the single-pole disconnector are mounted on their respective base frames. The product mainly consists of a base, post insulators, main conductive circuit, and self-locking device. The conductive circuit adopts a knife-type structure, with each phase knife consisting of two conductive blades. Compression springs are mounted on both sides of the blades, and the required contact pressure can be obtained by adjusting the spring height. Some improved products have a buffer device designed on the stationary contact side, providing initial thrust to the conductive rod when opening, making the operation process smoother.
Operating Principle and Mechanical Characteristics
The operation of this type of hv isolator switch device relies on an insulated hook or a power mechanism. In manual operation, the insulated hook engages the switch locking hook; pulling the hook moves it in the opening direction, releasing the self-locking device and causing the conductive plate to rotate, thus completing the opening. Closing is achieved by reversing the operation until the self-locking device locks the switch in the closed position. For high-current products, the conductive arm adopts a double-layer structure design, with a transmission mechanism controlling the vertical opening and closing actions between the conductive arm and the stationary contact seat. The GW16 model uses a single-arm folding moving contact system; the transmission components are sealed inside the main conductive tube, unaffected by the external environment.
