DC resistance fast tester manufacturers explain how to test the direct resistance of the transformer?
(1) Test wiring The test winding is connected to the corresponding terminal of the ZL-6200 DC resistance tester panel, and the non-test winding and the non-test phase are suspended. The test line voltage clip is on the inside and the current clip is on the outside. Tested separately: AO, BO, CO;
(2) Test results of transformer direct resistance tester 2.1, 1.6MVA or more transformer, the difference between each winding resistance should not be greater than 2% of the average value of the three phases, the winding without neutral point, the difference between the lines should not be greater than 1% of the three-phase average
2.2, 1.6MVA and the transformer below, the phase difference is generally not more than 4% of the average value of the three phases, the difference between the lines is generally not more than 2% of the average value of the three phases;
2.3, the balance causes structural reasons, the high pressure side only compares AO with CO, and the low pressure side only compares. BO, only compared to the previous value.
2.4 Compared with the values ​​measured in the same part before, the change should not exceed 2%;
2.5 Single-phase transformers should have no significant change at the same temperature compared to previous measurements.
2.6 Resistance value at different temperatures is converted by the following formula: R2=R1(T+t2)/(T+t1), where R1 and R2 are resistance values ​​at temperatures t1 and t2, respectively; T is resistance temperature constant, copper Take 235 wire and 225 wire.
Note: When testing with ZL-6200 DC resistance tester, due to the perfect protection function of the instrument, it can reliably protect the impact of back EMF on the instrument, and the performance is more reliable. It has an audible discharge alarm, clear discharge indication, reduce misoperation; response speed Fast, the on-load tap-changer can be directly converted in the measurement state, and the instrument automatically refreshes the data. After the test is completed, be sure to wait for the discharge alarm sound to stop before turning off the power and remove the test line. To measure the unloaded voltage regulating transformer, be sure to switch the gear position after the discharge indicating alarm sound stops. It is forbidden to move the test clip and power supply line during the test.
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