Five major factors affecting the planning and design of high and low voltage switchgear cabinets in the production of prefabricated cabins

Five major factors affecting the planning and design of high and low voltage switchgear cabinets in the production of prefabricated cabins

First is the insulation factor

The internal facilities of the high and low voltage switchgear include current Voltage transformer, grounding switch, disconnector, load switch, high-voltage circuit breaker, high-voltage fuse, low-voltage contactor, high-voltage live display, insulating parts, high-voltage reactor, high-voltage single-phase shunt capacitor and other equipment. The internal electrical appliances of the equipment are relatively complex, and the overall structure is relatively compact. However, a certain distance must be reserved between the switches to ensure that there is no short circuit or electromagnetic impact between the lines, in order to ensure the safety and stability of the internal circuits of the entire switchgear. Simply using air as the insulation medium is not feasible. A non-metallic insulation board should be inserted between each switchgear and a layer of insulation material should be attached to the transmission joints of each switchgear to ensure the stable operation of the equipment to a greater extent.

The second factor is temperature rise

The internal equipment of the surplus prefabricated cabin must maintain a constant temperature, and the high and low voltage switchgear is no exception. There are high-voltage fuses and circuit breakers inside the switchgear. These two types of switchgear generate a large amount of heat when passing through strong currents, causing a sudden increase in temperature inside the switchgear. When the temperature reaches its peak, it will burn out the elemental components, causing accidents. Although there is an industrial grade security air conditioning installed inside the cabin, the overall enclosed switchgear greatly reduces the cooling effect on internal equipment transmission. It is necessary to apply a heat absorbing and cooling coating inside the shell to ensure the stability of the equipment.

The third factor is the condensation factor

The occurrence of condensation phenomenon is actually an advanced point of temperature rise factor. When the temperature inside the cabin is constant and the temperature inside the switchgear increases, a large amount of temperature difference will be generated, causing water molecules in the air to adhere to the inside of the switchgear, leading to condensation phenomenon and easily affecting the entire switchgear equipment. The solution is to ensure that the temperature inside and outside the cabinet is suitable during design.

The fourth is stability

The cabinet body must maintain good stability, and the overall structure chassis must be stable. High voltage and strong currents often pass through the cabinet body. When dealing with these problems, various switch components will generate considerable kinetic energy, which will have strict requirements for the stability of the entire equipment. The selection of materials between the overall equipment must meet the usage standards, and the connections should also be tightly welded together.

Finally, the five prevention functions of the cabinet body

The five prevention functions of high-voltage cabinets and box type substations are different, and the five prevention functions of cabinets include the following points:

1) Preventing false opening and closing of circuit breakers

2) Prevent live operation of grounding switches or temporary grounding wires, i.e. artificial short circuit grounding.

3) Preventing people from accidentally entering the electrified interval means preventing operators from getting electrocuted during maintenance in the later stage.

4) Prevent power transmission when equipped with temporary grounding wires or grounding switches are closed to prevent artificial short circuits.

5) Prevent the opening and closing of the upper and lower isolation switches with load or the pushing and pulling of the circuit breaker handcart with load.

In summary, these five relevant factors must be taken into account when designing prefabricated cabins for high and low pressure, to ensure the safety and stability of the entire cabin and avoid various problems in the later stage.

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