Method for preventing connection point of cable lug and knife switch from overheating during current carrying

Abstract

The invention discloses a method for preventing a connection point of a cable lug and a knife switch from overheating during current carrying. The method is characterized in that a bypass conductive belt is arranged on the connection point of the cable lug and a knife switch type terminal board; and one end of the bypass conductive belt contacts the upper surface of the cable lug to form electrical connection, and the other end contacts the lower surface of the knife switch type terminal board form electrical connection. The method not only enlarges the contact area of the cable lug and the knife switch type terminal board but also increases current channels of connection point, thereby more uniformly distributing load current, reducing contact resistance and effectively preventing the connection point of the cable lug and the knife switch from overheating in the process of current carrying operation. The invention has the advantages of simple method, easy manufacture of the bypass conductive belt, no change of the original structure of electrical equipment during construction and convenient field construction.

Description

technical field [0001] The invention relates to a contact system of a high-voltage transmission line, in particular to a method for preventing overheating of a connection point between a cable lug and a knife switch during current-carrying operation. Background technique [0002] At present, the contact form of the power network is that the cable end lug and the knife-type terminal board of the power receiving / power receiving end equipment are fastened and connected by bolts (such as figure 1 shown). This kind of contact is simple and easy to operate, but over time, the contact will loosen, the contact surface will be oxidized, fouled, the effective contact point at the contact will be reduced, overheating, and even sparking. Tracing it to its cause, this is due to the current contact form. Although the commercially available cable lug matches the cable section and the current carrying capacity meets the requirements, due to the limited bottom area of ​​the lug, the contac...

AI Technical Summary

Problems solved by technology

Although the commercially available cable lug matches the cable section and the current carrying capacity meets the requirements, due to the limited bottom area of ​​the lug, the contact between the lug and the connecting plate is only on one side, and the current transmission is only between the lug of the cable and the connecting plate. As the weather changes and the current-carrying operation lasts for a long time, a slight deformation will appear at the connection, the two contact surfaces will gradually separate, the current channel will become smaller, the contact resistance will increase, and the contact overheating will naturally occur. , especially in the hot summer, when the load reaches more than half of the rated capacity, excessive energy loss may occur, causing dangerous overheating of the contacts and affecting operational safety.

However, as far as this problem is concerned, there is no better solution

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