For power transformers with a voltage level of 10KV and below, the detection requirements in the winding DC resistance test item are: the transformer is 1.6MVA and below, and the requirements for phase-to-phase difference regulations: it should not be greater than 4% of the average value of the three phases. For the line-to-line difference regulations Requirements: It should not be greater than 2% of the average value of the three phases.

For transformers above 1.6MVA, the phase-to-phase difference should not be greater than 2% of the three-phase average value, and the line-to-line difference: the regulation requirement should not be greater than 1% of the three-phase average value.

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For power transformers with a voltage level above 10KV, the detection requirements in the winding DC resistance test item are: for transformers of 1.6MVA and below, the requirements for phase-to-phase difference regulations: should not be greater than 4% of the average value of the three phases, and for the inter-line difference regulations Requirements: It should not be greater than 2% of the average value of the three phases.

For a transformer of 1.6MVA, the phase-to-phase difference should not be greater than 2% of the three-phase average, and the line-to-line difference should not be greater than 1% of the three-phase average.

The above are the test requirements in the electric power regulations when using the DC resistance tester to test the DC resistance test items of the power transformer windings.

The parameters of the DC resistance tester, such as the size of the output constant current and the test range, can be customized and selected according to the parameters of the specific transformer and the required test parameters. For inductive load resistances such as transformers, motors, and transformers, Wires, cables, and weld interface resistance can be tested with a DC resistance tester.