Carbon brush and slip ring were important parts of the generator excitation system. Due to some factors, the phenomenon of carbon brush getting high temperature or wearing affected the safe generator operation seriously. The force of pressure spring was got on carbon brush by experiment, pressure values of both 8 positive carbon brush and 8 negative carbon brush in two generators were analyzed, the pressure spring pressure of two generators carbon brush was compared, reasons of brush getting high temperature were got , and proposals for change were given.

The wheel leaves of Kaplan turbine are important components that convert the kinetic and potential energy of water into mechanical energy. The overall performance of the unit was changed when water turbine blade was replaced. The test must be performed on the output and vibration. In order to test the operation of the set of dynamic balance quality, dynamic characteristics of hydraulic turbine, and the maximum load capacity verification, the stability of hydraulic turbines was tested. The test results show that the unit could operate safely and stably in the water head under the rated power.