Due to the limitations of engineering project construction in China, when the transformer and low-voltage distribution cabinet are not at the same horizontal elevation and the transformer capacity has a significant impact, the use of network cables obviously cannot meet the needs of low-voltage distribution cabinets. High current transmission.

The use of enclosed production bus ducts is a more reasonable choice. The design of the 3000 ton polyester polymerization plant substation adopts enclosed bus ducts.

This substation is equipped with 6 kV and 2 transformers with a capacity of 2000 kVA. Due to construction limitations, the high voltage distribution room and transformer room are located on different floors, and the low voltage sides of the two transformers are connected to the low voltage distribution cabinet through an air type bus duct.

Maintenance of high-voltage bus duct:

1. Check if the busbar trunking system is powered off before maintenance; Completely cut off all power supply to the bus duct; Use a multimeter to measure whether there is voltage on the conductor and confirm that the bus duct system is not electrified. Maintain the line. Prevent serious accidents where high voltage can cause personal injury or even death to operation and management personnel. During the operation of the bus duct, check for any water leaks, sprays, potential sources of moisture, heavy objects that pose a threat to the system, and heat sources that affect the temperature rise of the bus duct system around the entire system Check for foreign objects and whether they can enter the bus duct. Check if there are any defects or corrosion in the components of the bus duct system, and if the technical support springs need to have appropriate elasticity. Replace immediately if any problems are found.

2. The high-voltage bus duct should be inspected and maintained at least once a year during long-term operation. The total load working current should not exceed the design current and rated current of the main busbar. When the busbar operates for a long time, regular organizational inspections and joint temperature rise should be carried out annually. The joint temperature rise should be qualified according to GB7251 standard and should not exceed 70 ℃. Check the connection bolts of all busbar joints and the different parts of the conductor contact, as well as whether they are loose. Prevent joint loosening caused by increased resistance and heating. Check the insulation materials and whether there is aging, and whether the conductive parts have melted or deformed. If indirect phase breakdown or insulation breakdown occurs, it should be dismantled in sections and the fault should be checked with a voltage tester, or the bus duct should be replaced, or the insulation layer should be re applied. Check if the pins of the plug-in box in the busbar trunking system can make good contact with the busbar.

Regularly clean the dust on the surface of the bus duct system to ensure good heat dissipation.