The HXGN17-12 switch cabinet is a metal-enclosed box-type structure. The cabinet frame is welded by angle steel. The cabinet is divided into a circuit breaker room, a busbar room, a cable room, a relay room, etc., and the rooms are separated by steel plates.
The circuit breaker room is in the front lower part of the cabinet. The rotation of the circuit breaker is connected by a pull rod and an operating mechanism. The upper terminal of the circuit breaker is connected to the upper disconnector, and the lower terminal of the circuit breaker is connected to the current transformer. The current transformer is connected to the lower disconnector terminal. The circuit breaker room is also equipped with a pressure release channel. If an internal arc occurs, the gas can release the pressure through the exhaust channel.
The busbar room is in the upper back of the cabinet. In order to reduce the height of the cabinet, the busbar is arranged in a herringbone shape and supported by a porcelain insulator with a bending strength of 7350N. The busbar is connected to the upper disconnector terminal. The busbar rooms of adjacent cabinets can be isolated.
The cable room is at the rear of the lower part of the cabinet. The cable room supports insulators that can be equipped with voltage monitoring devices. The cables are fixed on the brackets. When the main connection is a communication scheme, this room is the communication cable room. The relay room is at the front of the upper part of the cabinet. The indoor mounting plate can be installed with various relays, etc. There are terminal row brackets in the room. Secondary components such as indicating instruments and signal components can be installed on the door. Secondary busbars can also be arranged on the top.
The operating mechanism of the circuit breaker is installed on the left side of the front. Above it is the operation and interlocking mechanism of the disconnector. The switch cabinet is double-sided maintenance. The secondary components of the relay room are inspected in the front, the operating mechanism, mechanical interlocking and transmission parts are maintained, and the circuit breaker is inspected. The main busbar and cable terminal are repaired in the back. A lighting lamp is installed in the circuit breaker room. A grounding copper busbar parallel to the cabinet width is provided below the front door. Its cross-section is 4x40mm.
Mechanical interlock: In order to prevent disconnection and closing of disconnectors under load, prevent accidental opening and closing of circuit breakers, prevent accidental entry into live compartments, prevent closing of grounding switches under power, and prevent closing of grounding switches with grounding knives, the switch cabinet adopts corresponding mechanical interlocks. The operating principle of mechanical interlocks is as follows:
(1) Power failure operation (operation - Maintenance)
The switch cabinet is in the working position, that is, the upper and lower isolating switches and circuit breakers are in the closed state, the front and rear doors are locked, and are in live operation. At this time, the small handle is in the working position.
First, open the circuit breaker, then insert the small handle into the operating hole of the lower isolation and pull it from top to bottom to the lower isolation opening position, take off the handle, and then insert it into the upper isolation operating hole, pull it from top to bottom to the upper isolation opening position, then take off the operating handle, insert it into the grounding switch operating hole, and push it from bottom to top to make the grounding switch in the closed position. At this time, the small handle can be pulled to the "maintenance" position, and the front door can be opened first, and the key behind the door can be taken out to open the back door. After the power outage operation is completed, the maintenance personnel will maintain and inspect the circuit breaker room and cable room.
(2) Power supply operation (maintenance - operation)
If the maintenance is completed and power supply is required, the operation procedure is as follows:
Close the rear door, take out the key and close the front door, and turn the small handle from the "maintenance" position to the "disconnection lock" position. At this time, the front door is locked and the circuit breaker cannot be closed. Insert the operating handle into the operating hole of the grounding switch and pull it from top to bottom to put the grounding switch in the open position. Remove the operating handle and insert it into the operating hole of the upper isolator. Push it from bottom to top to put the upper isolator in the closed position. Remove the operating handle and insert it into the operating hole of the lower isolator. Push it from bottom to top to put the lower isolator in the closed position. Remove the operating handle and turn the small handle to the working position. At this time, the circuit breaker can be closed.
6. Product dimensions and structure diagram (see Figure 1, Figure 2, Figure 3)
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