Thermo cartridges

One of the most common ways to connect is non-isolated steel-aluminum and aluminium wires in the loops of overhead line supports Power transmission is thermite welding of connected wires using thermal cartridge type PAS.

Thermal cartridge PAS is a solid product consisting of from a thermite stick pressed on a steel tube and a liner Made of aluminum alloy. On the termite checker on the side there is a red mark, indicating the place from which the burning with a thermite match is performed. In the process of combustion, the temperature of the thermite checker reaches 2000 ° C, which makes it easy to melt the liner inside the steel tube Made of aluminum alloy and perform the connection of two wires. All thermo cartridges are packed in strong waxed paper, on the surface of which the marking is marked with stamp paint.

When using thermal cartridges, there is no need for an expensive press equipment – it will be enough to perform the work devices for thermite welding and special thermite matches together with standard mounting tools.

With proper welding of two wires using a thermostat it turns out to create a reliable connection that provides a good electrical contact (voltage drop on the connection section is not greater, than on a similar section of wire of the same length) and the necessary mechanical strength. However, due to the fact that the maximum withstanding mechanical the load of the connection from the welded wires does not exceed 10-15% of the breaking strength of the wire, it is permissible to use such a connection only when connecting wires in the plumes of overhead power line poles, where there are no wires significant mechanical loads.