1. Use
The high voltage switchgear is a complete power distribution unit. It is assembled by the manufacturer in a certain wiring mode to install the switch electrical appliances, busbars, measuring instruments, protective appliances and auxiliary equipment of the same circuit in a closed metal cabinet and supply the users in a complete set.
The device is compact in structure and easy to use: it is widely used in factories for ten control and protection transformers, high-voltage line shed high-voltage motors.
2. Type
China's current production of 3 ~ 35kv high-voltage switch refuses to use air and porcelain (or plastic) insulators as insulation materials, and the use of ordinary q1 electrical components. The high-voltage power distribution equipment commonly used in substations has a hand-nosed phase fixed switch rejection.
The cFc series is enclosed in a vehicle type high voltage switchgear, which is a single busbar structure and generally consists of the following parts.
(1) Handcart room: The front of the cabinet is the handcart treasure. The circuit breaker and the operating mechanism are mounted on the trolley, so the switchgear is called a handcart type switchgear. When normal, the handcart is pushed to the working position, and there is an observation window on the outer door of the cabinet to observe the internal situation. During the overhaul, replace the spare car and take the car outside the small cabinet for maintenance. Identification devices are installed on both the switchgear and the handcart. Ensure that only the same type of car can be interchanged. The circuit breaker communicates with the busbar and the outgoing line through the isolation trace.
When the circuit breaker is placed in the test position, the primary isolation head is disconnected and the secondary circuit is still connected. In order to debug the circuit breaker. The circuit breaker and the handcuff locking operation mechanism are expensive in the village machinery, which can prevent the umbrella from pulling the load. The secondary line connecting the handcart to the cabinet is connected by a plug.
(2) Instrument relay room: measuring instrument, pretty number relay, indicating the magical control switch installed on the door panel of Xiaosheng. Small indoor relay, terminal block and small fuse, etc. o (3) Main bus room: The main bus room is located at the rear or rear upper part of the switch, and the busbar isolation static contact is installed inside the room. The busbar is a closed structure, which is not easy to accumulate dust and is not easy to be short-circuited, and the reliability is high.
(4) Current transformer room: The current transformer room is located below the rear of the cabinet, and the room is equipped with a current transformer, an outgoing side, a static contact, an outgoing cable (or a hard bus), and a zero-sequence current transformer.
(5) Small busbar room: The small busbar is located above the instrument relay room, and the small busbar and terminal block are installed indoors;
The GG series is a fixed high-voltage switchgear. It is less sealed than the cFc series, and has a large installation staff on site. It is not very convenient to repair, but its manufacturing process is simple, the steel consumption is small, and the price is cheap. Therefore, the GG type switchgear is still widely used in the 3 to 10 kV power distribution unit of the substation.
3. Installation and adjustment
â— When the cabinet is in a single row, the corridor in front of the cabinet should be 2.5 meters. When the double row is arranged, the corridor between the cabinets should be 3 meters.
â— According to the project needs and drawings, the switch cabinet will be transported to the predetermined position, and more than 10 switch cabinet rows should start from the middle.
â— The switchgear should use a specific transporter during transportation, such as a crane or forklift. It is strictly forbidden to use rollers and skids. It is strictly forbidden to push the car into the cabinet. The handcart is only pushed after the cabinet is installed. Inside the cabinet.
â— Loosen the bolts on the top of the busbar compartment and remove the cover.
â— Remove the cable gland.
â— Remove the cover of the secondary trunking.
â— Remove the lifting plate and fasteners.
â— On the basis of the above, install the switchgear one by one, the installation unevenness shall not exceed 2mm.
â— When the switchgear cabinet has been assembled in a complete combination, it can be connected to the base member by ground bolts or welded by electric welding or base members.
Busbar installation
The busbars in the cabinet of the KYN port are all segmented rectangular busbars. The following steps must be taken during installation:
â— Clean and dry the soft cloth. Wipe the busbar clean. Check the heat-shrinkable tube or the vulcanized coated surface for defects. Apply conductive paste or neutral Vaseline to the joint.
â— Install the busbars one by one, connect the busbars and the corresponding branching busbars together, insert the appropriate spacers when bolting, and tighten them with bolts.
Installation of the grounding device in the center console
â— Connect the grounding busbars of each cabinet together.
â— Connect all the leads that need to be grounded in the cabinet.
â— Connect the base member to the ground. If there are more than 10 units, there must be more than two ground lines.
Cable installation
â— Make the cable head according to the cable construction specifications and connect it to the terminal in the cabinet.
â— Secure the cable to the cable gland with a cable clamp and tighten the cable gland.
Inspection after installation of the switchgear
When the switchgear cabinet is installed in place, remove the dust and debris in the cabinet, and then check whether the solid bolts are loose or not, and the wiring is not peeled off. Pull the circuit breaker out in the cabinet and perform the opening and closing operation to observe whether there is any abnormality. Zero the meter and check if the secondary wiring is correct according to the circuit diagram. Check if the interlock is valid.
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