Exothermic welding

Power Connections

Published in Milenko Braunovic, Valery V. Konchits, Nikolai K. Myshkin, Electrical Contacts, 2017

Milenko Braunovic, Valery V. Konchits, Nikolai K. Myshkin

Thermite (Exothermic) welding is a fusion welding process in which an electrical connection is formed when superheated, molten copper alloy is poured on and around the conductors to be joined (Table 7.9). This process requires no external source of heat or current and is completed within few seconds in a semi-permanent graphite mold in which the molten copper alloys causes the conductors to melt. The result of a reaction between a metal oxide and aluminum is liquid metal that acts as the filler metal and flows around the conductors making a molecular weld. The alumino-thermic reaction that occurs in the welding of copper conductors is: 3Cu2O+2Al→6Cu+Al2O3+Heat(1,060kJ)

Safety impacts of electric potential and electromagnetic fields as result of faults in electric distribution system

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Journal Information

Published in Journal of the Chinese Institute of Engineers, 2020

Bundit Rittong, Somporn Sirisumrannukul

A typical PEA outdoor substation supplying overhead distribution lines is shown on the left of Figure 2. The cross section of the ground grid conductor in the substation is 95 mm2. It is buried 0.5 m below ground level, while the ground rods inside the substation are 6 m long with a diameter of 16 mm. All the ground rods are directly connected to the main ground grid by exothermic welding. Each take-off structure is 15 m high. The OHGW of the substation has a cross section of 35 mm2 with a diameter of 7.5 mm and is connected to the top of each take-off structure.

Exothermic welding

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Power Connections

Safety impacts of electric potential and electromagnetic fields as result of faults in electric distribution system