High voltage switchgear installation steps

Installation steps for high voltage switchgear:

First of all, look at the inspection. For the unpacked switchgear, check the quantity and specifications according to the design drawings and the imitations. Check whether the requirements are met. The high-voltage switchgear cabinet has no damage or rust. Check whether the accessories are complete. . After opening the box, check the technical information documents such as the factory certificate, copy and internal wiring diagram. After the high-voltage power distribution cabinet is unpacked, the power distribution cabinets are numbered according to the design drawings and sequentially moved into the installation position in the substation.

After the switchgear is placed on the channel steel, the high-pressure cabinet is coarsely adjusted by using a thin horn, and the rest is adjusted based on one of them, so that all the high-pressure cabinets have the same surface and uniform gap. After the bolts are fixed, the gap between the cabinets is maintained at 2 to 3, and finally the cabinets are permanently fixed to the base channel steel by fixing bolts or welding methods. For the sake of beauty, the welds should be welded to the inside of the cabinet, and no less than 4 places, each length is 80 to 00~.

Connect the busbar. The main busbar and instrument on the switchgear are provided by the switch factory, or they can be made according to the design drawings at the construction site. The connection of the main busbar, the connection between the main busbar and the lower busbar, and the connection between the busbar and the instrument are bolted. The electric compound grease should be applied at the connection surface of the busbar. The tightening degree of the bolt and the connection condition of the connecting surface are determined by the torque wrench. Torque values ​​are tightened to tighten the bolts.

Handcart type high voltage switchgear installation

It is basically the same as the installation method of the fixed high-voltage switchgear. The difference is to ensure the interchangeability of the handcart. Each hand-cranked moving contact must be adjusted in the same way, and the moving and static contact center adjustments are consistent and tightly contacted to ensure interchangeability. Check the plug of the secondary circuit of the high voltage distribution cabinet and the auxiliary contacts 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 in and out of the handcart. The grounding device of the handcart is in excellent contact with the fixed frame of the high voltage distribution cabinet. The control cables in the high and low voltage switchgear are fixed firmly and do not affect the movement of the handcart.

The maintenance grounding branch of electrical equipment, appliances and non-charged metal parts shall comply with the following requirements: the connection is tight and firm, the section of the maintenance grounding wire is selected correctly, and the part of the coating to be preserved is evenly leaked. The route is fair, the color standard is correct, and the equipment and buildings are not polluted after painting. Check the “5-proof” chain of the power distribution cabinet, which is fully functional and reliable.

Process

The installation position of the electrical components is in accordance with the design drawings, and the installation is securely reliable;

1. The line sectional area of ​​one line meets the requirements of the drawings;

2. One-time copper busbars are tinned at the office, and the contact area meets the requirements;

3. The screw fastening of the first-line connection is reliable, and the contact resistance meets the request;

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

5. The electrical clearance is greater than one 0mm, and the creepage distance is greater than 25mm;

6. The floor row and the zero row shall be installed according to the drawings;

7. All kinds of micro-books are well-sticked and good;

8. Switching and splitting operation is reliable and unobstructed;

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

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