Rotor ground on-line monitoring device and method based on adaptive frequency square-wave voltage

Abstract

The invention discloses rotor ground on-line monitoring device and method based on adaptive frequency square-wave voltage. The device comprises a rotor ground real-time on-line monitoring processing unit, an adaptive frequency regulation square-wave power panel, a coupling resistance board and first and second measuring transducers. In the method, the coupling resistance board is adopted to prevent excitation high voltage from striking back the monitoring device; the adaptive frequency square-wave power panel adaptively regulates control voltage frequency corresponding to the power panel according to a fault mode of a motor rotor; the measuring transducers acquire control voltage and measuring voltage which are output by the adaptive frequency square-wave power panel; and the rotor ground real-time on-line monitoring processing unit judges a generator fault according to the control voltage and the measuring voltage. The invention has high monitoring precision and can simply find the fault point, thereby shortening repair time and reducing economic loss brought by power failure.

Description

technical field [0001] The invention relates to a rotor grounding online monitoring device and method based on an adaptive frequency square wave voltage in the field of generator fault detection. Background technique [0002] Generators are the heart of power systems. In the engineering research of power system, because the generator rotor winding is affected by mechanical rotation, high temperature, humidity, brake dust and other environments, the insulation of the rotor to the ground is reduced and the phenomenon of grounding occurs from time to time. Since there is no corresponding on-line monitoring and fault location device, when the grounding occurs, the location of the grounding point is not known, and it takes a lot of time to find the location of the grounding point before maintenance and treatment, which prolongs the processing time of the shutdown; I want to stop the machine to deal with the grounding fault, but the grounding disappears after the machine is stopp...

AI Technical Summary

Problems solved by technology

This method is still limited to the detection of the failure mode. It cannot accurately judge the failure mechanism and find out the ultimate root cause of the equipment failure. It is easy to cause the failure to recur. Moreover, the gradual failure of the system equipment cannot be projected in time, which cannot fully meet the requirements. Power Plant Condition Maintenance Requirements

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