No-load test, overspeed test and hydraulic generator set inspection?
1. Disconnect each overspeed protection contact of the speed measuring device from the water machine protection circuit and use temporary methods to monitor its action.
2. Manually bring the unit up to rated speed; After the unit is operating normally, continue to increase the opening of the guide vane opening limiting mechanism to increase the unit speed to 115% of the rated speed. Observe the action of the contacts of the speed measuring device.
3. If the unit operates without malfunction, continue to increase the speed to the overspeed protection setting value specified in the design and monitor the action of the electrical and mechanical overspeed protection devices.
4. During the overspeed test, the sway and vibration valuesof each part should be closely monitored and recorded, the temperature increase of each bearing and the change of the generator air gap should be recorded. , and if there are abnormal sounds should be monitored.
5. Once the overspeed test is stopped, the following inspections should be carried out:
1) Complete inspection of the rotating parts of the generator, such as rotor yoke keys, magnets. pole keys, damping rings and magnetic pole cables. Check whether the yoke clamp screw, etc. is loose or displaced.
2) Check the condition of the generator stator foundation and upper frame cylinder.
3) Adjust the overspeed protection device if necessary.
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To be precise, a hydraulic generator should be called a hydraulic generator. It consists of a hydraulic turbine and a generator which are matched to the generator. a device that uses hydraulic power to drive the turbine to drive the generator to produce electricity. The turbine generally has Francis type, axial flow type, impact type, etc., are power generation equipment composed of different shapes and generators according to different. heights and flow rates.