High and low voltage switchgear installation steps

The installation position of the electrical components conforms to the design drawings, and the installation is firm and reliable;

1. The sectional area of the primary line meets the requirements of the drawing;

2. The copper busbars of the primary line are tinned at the joint office, and the contact area meets the requirements;

3. The first-line connection screws are fastened and reliable, and the contact resistance meets the requirements;

4. Phase sequence arrangement: From the front, from left to right, from top to bottom, and from far to near, it is A, B, C;

5. The electrical clearance is greater than -10mm, and the creepage distance is greater than 25mm;

6. Ground row and zero row should be installed according to the drawings;

7. All kinds of micro notes are available and good;

8. The switch opening and closing operation is flexible and reliable, without stopping;

9. The wiring of the secondary line is in accordance with the design drawing, and the power-on attempt is correct;

10. Power frequency withstand voltage: 2kV/min, no flashover, no breakdown.

After the high and low voltage switchgear is placed on the channel steel, the high-voltage cabinet should be roughly adjusted with a thin shim, and then one of them should be used as a benchmark to adjust the rest so that all the high-voltage cabinet panels are consistent and the gap is uniform. After the bolts are fixed, a gap of 2 to 3 is maintained between the cabinets. Finally, the cabinets are permanently fixed to the foundation channel steel by fixing bolts or welding.

The laying of electrical equipment, appliances, and non-live metal parts of the maintenance grounding branch line should meet the following requirements: the connection is tight and firm, the maintenance grounding wire section is selected correctly, and the parts that need anti-corrosion are evenly painted without omission. The route is fair, the color code is accurate, and the equipment and buildings will not be polluted after painting. Check the "5 protection" chain of the power distribution cabinet, which is complete and reliable.

Installation of handcart type high voltage switch cabinet. The installation method is basically the same as that of the fixed high-voltage switchgear, but the difference is to ensure the interchangeability of handcarts. Each handcart-type moving contact must be adjusted consistently, and the center of the moving and static contacts must be adjusted uniformly and in close contact to ensure interchangeability. Check the plugs and auxiliary contacts of the secondary circuit of the high-voltage power distribution cabinet for reliable welding. The electrical or mechanical locking device is correct so that the handcart cannot be pulled out when it is in the closed position. The safety partition is easy to open and close, and can move with the in and out of the handcart. The grounding device of the handcart should have good contact with the fixed frame of the high-voltage power distribution cabinet. The control cable in the high and low voltage switch cabinet is firmly fixed and does not affect the movement of the handcart