First, the measurement method
    The bridge method is generally used for measurement. Since the rotor has been extracted when measuring the DC resistance of the sub-winding, the charging time is short, and the general double-arm bridge can be used. If a constant current voltage source is used as the power source for the bridge, the measurement time can be shortened and the sensitivity is high.
    Note when measuring:
    (1) Discharge the generator stator and rotor windings to ground before testing.
    (2) After the current is stable, check the flow meter switch again. After the measurement, disconnect the galvanometer switch and then disconnect the power switch.
    (3) The accuracy of the bridge should not be lower than 0.5.
    (4) The DC resistance of each phase (or branch) winding should be measured separately for stator windings for comparison.
    (5) In the cold state, the difference between the surface temperature of the winding and the ambient air temperature should not exceed ±3C. When measuring the temperature, multi-alcohol thermometers should be used, placed on the inter-tooth slot wedges, in the vents and at the winding ends, and averaged.
    (6) For the stator winding, measure the length and cross section of each phase (or branch) lead, and calculate the lead resistance according to the resistivity of the lead material. When calculating the DC resistance of each phase (or each branch), the lead resistance should be deducted. After correcting the errors due to the different lengths of the leads, the differences between the two and the initial measurements are compared.
    (7) When measuring with a double-arm bridge, connect the current terminals (C1, C2) and potential terminals (P1, P2) of the bridge to the head and tail ends of the stator winding of the generator.
    (8) The test leads shall be as short and thick as possible; and have good contact with the ends of the stator and rotor windings.
    (9) When comparing, it should be converted to the same temperature and calculated according to formula (4-3)
R 2 =R 1 (T+t 2 )/(T+t 1 )
    Wherein R 2 is the DC resistance at the temperature of t 2 ;
         R 1 - DC resistance at t 1 temperature;
         T - the material coefficient of copper, T = 235.
Second, measurement, analysis and judgment of results
    (1) The DC resistance values ​​of the phases or branches of the turbine generator are corrected for the errors caused by the different lengths of the leads. The difference between them and the measured values ​​at the first time (factory or handover) shall not differ from the minimum. 1.5% of the value (1% for hydroelectric generators). If the requirements are exceeded, the cause should be ascertained.
    (2) Attention should be paid to the difference between the phase (or between branches) of turbine generators and the relative change in their calendar years greater than 1%.
    (3) The DC resistance of the rotor winding is compared with the initial (intersection or overhaul) measurement, and the difference is generally not more than 2%. The pole-type rotor winding should also measure the connection point between the pole coils.
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