Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online

Abstract

The invention belongs to the generator online monitoring field, particularly relates to a device for monitoring and controlling a shaft voltage and a shaft current of a turbo-generator online and particularly relates to an online monitoring device having the generator shaft voltage control function. The device comprises a generator shaft voltage and shaft current online monitoring unit and a control unit, wherein the online monitoring unit and the control unit are arranged on a screen cabinet, the screen cabinet is provided with a window of a display, the display is connected with an industrial control computer, and the screen cabinet is internally provided with a keyboard and a mouse. The device has a compact structure and attractive appearance, is simple and convenient to mount, is safe, is convenient for an operator to mount, use and maintain, guarantees safe and stable operation of the generator, can accurately and stably monitor change of the shaft voltage and the shaft current of a turbo-generator rotor in an operation state in real time, reduces a shaft voltage and a shaft current of a generator set to make the voltage and the current be in a safe and reasonable value scope, improves safe operation reliability of the generator and provides bases for operation state evaluation of the generator.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of generators, and in particular relates to an on-line monitoring and control device for shaft voltage and current of a turbogenerator, especially an on-line monitoring device with the function of controlling the shaft voltage of a generator. Background technique [0002] With the increase of the single unit capacity of the steam turbine generator set, the inlet pressure, flow rate, flow velocity and other parameters of the steam turbine, the increase of the size of the unit, and the widespread use of static excitation systems, etc., cause a voltage on the large shaft of the generator set, which is called shaft voltage. If the shaft voltage suppression and protection measures are improper, harmful shaft currents will be generated in the generator bearings, bearing bushes, gears and other components. Parts, will produce many corrosion pits on the surface of the journal and bearing shell. Destroy...

AI Technical Summary

Problems solved by technology

However, the above measures are not foolproof. Due to poor insulation of the bearing pad base or grounding through small foreign objects, it is difficult to be found. When the grounding brush is in poor contact, the shaft current will still damage the bearing. Monitor and analyze the voltage and shaft current, and take effective control measures to ensure the safe and reliable operation of the turbo generator

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