【Weekly Topic】What issues should be considered during the voltage-raising operation of generators?

Reply to 1# zhaohh3211: When performing the voltage increase operation after the generator speed has reached its rated value, the following points should be noted: (1) The voltage increase should be carried out gradually, so that the stator voltage rises slowly. (2) During the voltage rise process, it is necessary to monitor that the rotor voltage and current, as well as the stator voltage meter readings, increase uniformly. The stator current should be zero; if current is detected, it indicates a short circuit in the stator circuit, and the excitation should be disconnected immediately for inspection. (3) When the voltage rises to 50% of the rated value, the generator’s zero-sequence voltage should also be checked to ensure that 3U0 ≤ 5V. (4) During the voltage rise process, it is necessary to check the operating condition of the generator and exciter, whether the brushes are functioning properly, and whether the inlet and outlet air temperatures are within normal ranges. (5) After boosting to the rated voltage, the insulation condition of the rotor circuit should be checked; the voltage of the positive and negative poles with respect to ground should be equal, and the sum of the voltages of the two poles with respect to ground should be less than 80% of the inter-pole voltage.