The test and analysis of DC resistance of winding is the most basic item of transformer preventive test, routine test and handover test, and also an important means to find out the fault and analyze after the transformer is in operation. Through testing the DC resistance of transformer winding in routine maintenance and analyzing the specific data, the welding quality of the conductor joint inside the transformer winding, the welding quality of the lead wire and the winding joint, the position of each tap of voltage tap changer and the contact between the lead and the bushing, the correctness of the parallel branch connection, the current carrying part of the transformer can be checked There are short circuit conditions and winding short circuit, etc. in addition, in the short circuit test and temperature rise test of transformer, in order to get a more accurate DC resistance value of winding, it is also necessary to measure the relevant DC resistance in general. Therefore, the measurement of DC resistance of winding is an important link in maintenance work. However, in the actual test process, there are often some special situations, the most prominent of which are three winding unbalance and inaccurate measurement. Of course, the test of DC resistance data of transformer is not the ultimate purpose of our work, but the analysis and judgment of the data after the test is obtained. In view of the actual problems reflected by different abnormal data, it is our ultimate goal to take or formulate measures to deal with and eliminate and reduce the related defects.<BR>
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