A method for online testing of the temperature of the distribution transformer heat run test winding, comprising: parameters of a capacitive element and of an inductive element are determined, the system for online testing of the temperature of the distribution transformer heat run test winding is designed, an adjustable inductor is adjusted to make a circuit to be in a parallel-connected resonant state, the switch (5) is disconnected while the direct current resistance tester (3) is connected for testing and analysis.
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