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The problem of optimising a number of connected welding power supply sources subject to significant load fluctuations during the changeover under conditions of minimum losses in the busducts is examined. By this system the power supply sources within one set are switched on and off automatically as a function of the overall load and the next power supply source is connected up as a function of the point at which the load is applied. The operation of the system is analysed and it is shown that in tests in a chemical machine building enterprise a saving of 37500 roubles p.a. was made.