Method for detecting polarity of degaussing coil of double-million transformer

The invention belongs to the technical field of transformer testing, and relates to a novel double-million transformer degaussing coil polarity detection method, which comprises the following steps of: connecting one core column of a transformer with a transformation ratio tester according to the distribution and circulation characteristics of a magnetic flux circulation loop; the two ends of the first degaussing coil and the two ends of the second degaussing coil are connected with a terminal and an n terminal of a transformation ratio tester respectively, and the transformation ratio and polarity of the low-voltage winding of the transformer core column and the two degaussing coils are measured through the transformation ratio tester; and if the measured polarities of the two ends connected with the a terminal of the transformation ratio tester are the same during two times of measurement, judging that the ends of the two degaussing coils connected with the a terminal of the transformation ratio tester are