Diagnosis method and system for generator rotor turn-to-turn short-circuit fault

A technology of inter-turn short-circuit fault and generator rotor, which is applied in the field of power system, can solve the problems of being unable to quantitatively evaluate the operating state of the generator rotor, and cannot provide early warning for initial signs, so as to achieve simple and reliable monitoring and analysis, and reasonable analysis results Effect

Active Publication Date: 2015-09-16
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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AI Technical Summary

Problems solved by technology

It is impossible to conduct an overall and quantitative assessment of the operating status of the generator rotor, and it is also unable to provide early warning of the initial symptoms of inter-turn short circuit in the rotor

Method used

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  • Diagnosis method and system for generator rotor turn-to-turn short-circuit fault
  • Diagnosis method and system for generator rotor turn-to-turn short-circuit fault

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Embodiment Construction

[0024] The invention establishes a model by using historical data, and judges the running status of the generator sub-rotor by analyzing the similarity between the real-time running data and the data in the model. The present invention will be explained in detail below in conjunction with the accompanying drawings and embodiments.

[0025] The generator rotor turn-to-turn short circuit fault diagnosis method of the present invention, such as figure 1 shown, including steps:

[0026] Step S101, using the normal state data model to analyze the real-time data of the generator rotor to obtain the similarity between the current operating state of the generator rotor and the historical normal state;

[0027] Step S102, judging whether the similarity between the current operating state and the historical normal state is lower than the normal state similarity reference value;

[0028] Step S103, if the similarity between the current operating state and the historical normal state is...

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Abstract

The invention discloses a method and system for diagnosing an interturn short circuit fault of a generator rotor. The method comprises the following steps: according to the normal state of the generator rotor and historical data before an interturn short circuit occurs, respectively establishing a normal-state data model and a fault-state data model; utilizing the normal-state data model to analyzing real-time data to determine whether the generator rotor is abnormal or not; and if yes, adopting the fault-state data model to analyzing the real-time data to determine whether the generator rotor will generate the interturn short circuit so as to conduct early warning. The model used by the analyzing process is established on the basis of huge amounts of historical data, so that the analyzed result is more reasonable, and the mode of always depending on rules and the experience of experts to judge and post-processing is avoided. The monitoring analysis to the interturn short circuit fault of the generator rotor on site is simpler and more reliable, the interturn short circuit fault of the generator rotor can be early warned and prompted, the fault is solved in time in bud, and the normal running of units is benefited.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and system for diagnosing a short-circuit fault between turns of a generator rotor. Background technique [0002] Generator rotor turn-to-turn short circuit is one of the typical faults of generators. In the early stage of the rotor inter-turn short circuit, the fault has little effect on the normal operation of the unit, and the fault characteristics are relatively unobvious, so it is often easily ignored; when the rotor inter-turn short circuit is serious, the rotor current increases significantly and the temperature rises sharply, making the generator useless. The power output is limited, the vibration of the unit is aggravated, and the life of the generator is affected, and there is even the possibility of a vicious accident. Therefore, it is of great practical significance to conduct a comprehensive diagnosis of the inter-turn short-circuit fault of the gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 廖宏楷张征平张远胡卫
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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