Abstract: When new substations and lines are put into operation, relevant tests must be carried out, and the power system can be put into operation only after the test being verified correct.It introduces the methods of primary phasing, primary nuclear phase and heterogenous secondary nuclear phase tests, which can verify the correctness of the primary system wiring of the power system. The method of homologous secondary nuclear phase test is introduced, which can verify the correctness of voltage secondary circuit wiring. In view of the new operation of the line interval, the new operation of the main transformer of the two winding transformer, the new operation of the main transformer of the three winding transformer and the new operation of the outgoing line of the traction station, the phasor measurement of the secondary circuit protection need to be carried out. The correct phasor diagram is drawn to verify the correctness of the relevant current circuit wiring. Through the method verifying, whether or not the new equipment meets the requirements of operation.