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In the whole process of repair and maintenance of power supply systems such as power stations, power lines, power stations and their factories and mines, high and low voltage switch machines have key practical significance. The key functions of this equipment are: based on power grids and electrical appliances. The requirements for equipment operation, the electrical equipment or power line is released from the power grid, or the funds are invested in the power grid; when the power engineering generates common faults, the power circuit that generates a part of the common fault can be quickly disconnected, thereby further improving the power grid. The safety operation ensures the safety of the maintenance staff. Therefore, in order to ensure all normal maintenance and repair of the power converter equipment, all electrical equipment must operate normally, and must take the heavy weight to consider the high and low voltage switchgear equipment, which has key practical significance for all normal operation of all power supply systems. .
According to different functions and functions, high and low voltage switchgear can be divided into the following categories:
(1) Components and components. There are many types of components and components, and the commonly used ones are: protective earthing power switch, common fault isolation switch high voltage load switch, fuse protection device, short circuit protector, etc. The component components obtained after the components are assembled, such as the composition of the circuit breaker power switch and the protection of the high-voltage load switch.
(2) Detailed machinery and equipment. If components and components are effectively distributed and organic chemistry is formed, the characteristics of high and low voltage switchgear equipment can be further improved, and after being closed with a plastic case, a very detailed product can be obtained. For example, high-voltage switchgear, vapor-insulated metal-enclosed switchgear (GIS), etc.
Since the beginning of the 1990s, the high and low voltage switch manufacturing industry has just begun to import into China and has achieved rapid development. In the 1960s and 1970s, China produced a monopoly market for power switches, but nowadays, countless switchgear manufacturers have already invested in manufacturing, which can significantly see the development of high and low voltage switch manufacturing industry in China. Fast.
The high and low voltage switchgear is a box-type transformer. It is connected with high-voltage power distribution cabinets, low-voltage switchgears, and connecting cables. It is widely used in power supply bureaus and substations, and then lowers blood pressure to low-voltage switchgear via transformers. Low-voltage distribution boxes, distribution boxes, control cabinets, etc. are equipped with low-voltage power distribution cabinets, that is, assembling some maintenance components such as power switches, buttons, disconnectors, display lights, cable wires, circuit breakers, and instrument panels. Into an integrated box transformer.
2 Installation of high and low voltage distribution cabinets
2.1 Installation plan and execution mode of high and low voltage distribution cabinets
The state regulations on the installation of high-voltage cabinets and low-voltage switchgear cabinets are very strict. It is necessary to strictly implement the "Regulations on the construction and construction acceptance of high-voltage electrical equipment for electrical equipment and equipment installation engineering" and the installation of electrical equipment and equipment. The installation and construction of the panel and the control loop construction and construction acceptance specification of the control circuit, and the construction and construction acceptance specification of the busbar equipment of the electrical equipment and equipment installation project are carried out.
(1) Engineering construction plan
Unpacking and checking machine equipment → equipment handling → stabilizing the cabinet door → re-routing in the cabinet → adjustment test → successful engineering acceptance → closing operation. (2) Construction method
Gradually install according to the engineering drawings, and put the cabinets on the basic channel in the prescribed order. One by one will carry out the positive effect of the positive banking service and the flatness of the side. After placing the cabinets in the cabinets, first straighten the cabinets on both sides, and then slide the small lines directly below the cabinet at a height ratio of 2/3 of the road surface, and then carry out the whole process of aligning each unit and finding the right one. According to the iron piece, moderate adjustment can be carried out. The thickness of the iron piece is 0.5mm, and the iron piece of each dwelling is up to 3 pieces. Then it is said that the hand drill is used to make a hole in the basic channel steel wall. The specifications of the hole are usually the low voltage switch cabinet ф12.2mm hole, the high voltage cabinet ф16.2mm hole, each with M12, M16 hot-dip galvanized screw and spring washer They are fixed and not good. The construction process is stricter on the vertical and horizontal unevenness of the cabinet door. It must meet the requirements. After the hot-dip galvanized screws are used to carry out the regulations on the cabinet door and the baffle, the preparation work before the closing is just started.