Method for reducing failure rate of knife switch on 10KV column

Abstract

The invention discloses a method for reducing the failure rate of a knife switch on a 10KV column. The lower part of the moving contact of the knife switch is additionally provided with a connecting copper bar, a connecting board on the upper parts of the moving contact and the static contact of the knife switch is lengthened or a connecting board is additionally arranged, an insulation column isarranged between the lengthened part of the connecting board or the connecting board additionally arranged and the connecting copper bar so as to fix the connecting copper bar; a flat board extends downwards with a 90-degree angle from the end of the connecting copper bar, a cable is connected on the flat board, and the distances from a cable connector to the moving contact and the static contactof the knife switch are lengthened. The invention can make the maintenance personnel maintain a sufficient safety distance of 700mm away from the electrified body, thereby ensuring the personal safety, improving the force condition of the knife switch, preventing the ceramic body of the knife switch from being broken to cause failure, and improving the power supply reliability.

Description

technical field [0001] The invention relates to a method for reducing the failure rate of a knife switch on a 10KV column. Background technique [0002] With the continuous development of urban power grid construction, the application of cable lines is becoming more and more popular. The number and length of cable lines and cable overhead hybrid distribution lines are increasing. The original power distribution installation and maintenance process is used, and the operation method can no longer meet the needs. Especially the problem that the connection device-10 between the cable and the overhead line appears on the knife switch on the volt column is extremely prominent. During maintenance, the maintenance personnel can only make the ground wire at the connection part between the knife switch and the cable, because the distance between the knife switch on the column and the live body is only about 200mm, it cannot guarantee the safety distance of 700mm between the maintenanc...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of urban power grid construction, the application of cable lines is becoming more and more popular. The number and length of cable lines and cable overhead hybrid distribution lines are increasing. The original power distribution installation and maintenance process is used, and the operation method can no longer meet the needs. In particular, the connection device between the cable and the overhead line - 10 has extremely prominent problems with the knife switch on the pole

During maintenance, the maintenance personnel can only make the ground wire at the connection part between the knife switch and the cable, because the distance between the knife switch on the column and the live body is only about 200mm, it cannot guarantee the safety distance of 700mm between the maintenance personnel and the live body when taking safety measures , this safety distance is the safety distance in the "Safety Regulations" of the power system, so it is very easy to cause personal electric shock or line grounding fault, endangering the personal safety of maintenance personnel; The force is large, and the fracture of the porcelain body often occurs, such as figure 1 As shown in , the reason is that the connection between the main body of the cable and the ceramic body of the knife gate is at an angle of 90°, and the self-gravity of the cable forms a force arm L of about 600mm in length at the joint of the ceramic body of the knife gate, which causes the ceramic body of the knife gate to withstand the long-term A large torque, and, with the increase of the load of the urban power grid, the diameter of the cable continues to increase, and the torque borne by the ceramic body is also increasing, so the failure of the ceramic body is on the rise

The above reasons not only highlight potential safety hazards, but also reduce the reliability of power supply

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