The main composition of high and low voltage switchgear
May 20, 2021
High and low voltage switchgear is a device for connecting high voltage or low voltage cables.
1. High and low voltage switchgear-the material of the cabinet:
1. Cold rolled steel plate or angle steel (for welding cabinet);
2.Aluminum-zinc steel plate or galvanized steel plate (used for assembling cabinets).
3.Stainless steel plate (non-magnetic).
4. Aluminum plate ((non-magnetic).
2. High and low voltage switchgear——The functional unit of the cabinet:
1. Bus room
The busbar room is arranged on the upper part of the back of the switch cabinet for installation and arrangement of three-phase high voltage AC busbars and for connecting with static contacts through branch busbars. All busbars are plastic-sealed with insulating sleeves. When the busbar passes through the partition of the switchgear, it is fixed with a busbar bushing. If an internal fault arc occurs, it can limit the spread of the accident to adjacent cabinets and ensure the mechanical strength of the busbar.
2. Handcart circuit breaker room
A specific guide rail is installed in the circuit breaker room for the circuit breaker trolley to slide and work inside. The handcart can move between the working position and the test position. The partition (trap) of the static contact is installed on the rear wall of the handcart room. When the handcart moves from the test position to the working position, the partition is automatically opened, and the handcart is moved in the opposite direction to fully compound, thus ensuring that the operator does not touch the charged body.
3. Cable room
The cable room can be equipped with current transformers, grounding switches, lightning arresters, overvoltage protectors, cables and other auxiliary equipment, and a slitted and removable aluminum plate is prepared at the bottom to ensure the convenience of on-site construction.
4. Relay room
The panel of the relay room is equipped with microcomputer protection devices, operating handles, protective outlet pressure plates, meters, status indicators or status displays. The relay room is equipped with terminal blocks, microcomputer protection control loop DC power switches, microcomputer protection working DC power supplies, and storage. It can switch DC or AC, and the secondary equipment with special requirements.
