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The low-voltage complete control cabinet shall pass the test in accordance with the provisions of the first stream 3.1.8 of this code and meet the following requirements:
The low-voltage complete control cabinet is a combined low-voltage switchgear assembled in the work of the specification module for the operation of power distribution equipment, electromagnetic energy conversion and electromagnetic energy consumption machine equipment. The key application areas of low-voltage control cabinets are:
1. Water supply and drainage for engineering buildings, environmental protection and energy conservation for hydropower plants, uniform hydration, temperature control and heating. 2. Multi-storey buildings, residential quarters, government agencies and other tap water. 3. Various industrial sewage treatment, water plants, sewage treatment stations, airports, agricultural and animal husbandry irrigation, sprinkler irrigation equipment stations. 4. Oil and gas field oil pipelines, oil depots, oil ports, and old and old drinking water systems are upgraded and upgraded. For the basic elements of the design of electrical cabinets, and the specific work experience in the design of electrical cabinets, the key points in the design of the electrical cabinets are the following three levels of problems:
1. Environmental hazard problems at work
The hazards of the office environment for electrical cabinets include the two aspects of working temperature hazard and altitude hazard at work. The working temperature in electrical cabinets refers to high temperature, low temperature and average temperature. In order to ensure that the electrical cabinet works properly, it should be able to work between high and low operating temperatures and can work for a long time at the average operating temperature. The key to the altitude is harmful to the volume resistivity and the actual effect of evaporative cooling. Generally, when the altitude of the sea is more than 1000 meters, the hazard of the altitude is more significant. 2, the door design problem
The size design scheme is the main idea of the design scheme of the electrical cabinet door, which is greatly damaged by the equipment specifications in the cabinet. Generally, if the amount of current is large, the volume of the equipment and the volume of the door are relatively large, and the cabinet door needs to adopt the design method of the front and rear doors and doors, so as to ensure the actual operation outside the electrical cabinet. In addition, in order to improve the heat pipe cooling capacity of the electrical cabinet, it is also necessary to design a natural ventilation window and a radiator fan. 3, electromagnetic induction compatibility issues
The electrical cabinets stipulate that the soft starter has the function of communication and shifting, but it is not known that the communication and shifting will also generate the necessary interference signal hazard. The soft starter I/O route arrangement is not scientific, the route grounding device method is not perfect, the radio wave shielding is not effective, and other factors will cause electromagnetic induction compatibility problems of the electrical cabinet. To prevent electromagnetic compatibility testability on electrical cabinets
The characteristics lead to adverse effects, and it is necessary to ensure that the interference signals in the software environment of the machine equipment are within the necessary range, and that the equipment must be able to withstand the electromagnetic induction hazard in the office environment.
The low-voltage complete control cabinet design and manufacturing assembly should meet the following content standards:
1. Practical operation is convenient. When the electronic device is actually operated, it cannot be hindered by the indoor space, and there is no need to touch the charged body. 2, overhaul is very easy. It is convenient to replace the electronic device and repair the connection. 3. The gaps and creepage distances of electrical equipment of various electrical components and equipment shall meet the requirements. 4. Ensure that the installation spacing of the line is again. What standards should be considered for the manufacture of electrical cabinets? 1. The ambient gas temperature of the outdoor electrical cabinet The ambient gas temperature should not exceed +40 °C, and the average temperature does not exceed +35 °C within 24 hours. The lower limit of the ambient gas temperature is -25 °C in warm areas and -50 °C in cold areas.