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Early warning method for penetrating cracks in vertical Francis hydro-generator runners

A hydro-generator and early warning technology, applied in the fields of hydro-generator online monitoring, fault diagnosis, and state assessment, can solve problems such as inability to accurately judge runner cracks and a large number of manual interventions.

Active Publication Date: 2022-08-05
HUANENG LANCANG RIVER HYDROPOWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the vibration swing of various types of hydro-generators, complex and variable working condition parameters, and massive variable values, it is necessary to carry out correlation analysis one by one, so as to further carry out the runner degradation analysis, which requires a lot of manual intervention, and cannot pass the feature variables to accurately determine the specific failure of the runner crack

Method used

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  • Early warning method for penetrating cracks in vertical Francis hydro-generator runners
  • Early warning method for penetrating cracks in vertical Francis hydro-generator runners
  • Early warning method for penetrating cracks in vertical Francis hydro-generator runners

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A method for early warning of penetrating cracks in a runner of a vertical Francis turbine generator includes the following steps:

[0061] (1) Install the top cover + X direction horizontal vibration monitoring sensor, top cover - Y direction horizontal vibration monitoring sensor, and top cover + X direction vertical vibration monitoring sensor at the top cover of the hydro-generator; install the water guide at the water guide bearing position +X swing monitoring sensor, water guide -Y direction swing monitoring sensor;

[0062] (2) Collect data, including: time, generator active power, unit water head, guide vane opening, roof + X-direction horizontal vibration peak-to-peak value, roof-Y direction horizontal vibration peak-to-peak value, roof + X-direction vertical vibration Peak-to-peak value, water conductance+X swing peak-to-peak value, water conductance-Y direction swing peak-to-peak value;

[0063] (2) Data screening: select the data with active power ≥ rated p...

Embodiment 2

[0077] A method for early warning of penetrating cracks in a runner of a vertical Francis turbine generator, comprising the following steps:

[0078] (1) Install the top cover + X direction horizontal vibration monitoring sensor, top cover - Y direction horizontal vibration monitoring sensor, and top cover + X direction vertical vibration monitoring sensor at the top cover of the hydro-generator; install the water guide at the water guide bearing position +X swing monitoring sensor, water guide -Y direction swing monitoring sensor.

[0079] (2) Obtain the data collected by the system, including: time, generator active power, unit water head, guide vane opening, roof + X direction horizontal vibration peak-to-peak value, roof -Y direction horizontal vibration peak-to-peak value, roof + X direction Vertical vibration peak-to-peak value, water conductance +X swing peak-to-peak value, water conductance-Y direction swing peak-to-peak value;

[0080] (2) Data screening: select the ...

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Abstract

The invention relates to a method for early warning of penetrating cracks in a runner of a vertical Francis turbine generator, belonging to the technical field of coatings. The method includes: installation of monitoring sensors; data collection; data screening; working condition segmentation; data is divided into sample data sets and monitoring data sets; data cleaning; Limit ratio; runner crack judgment logic calculation and alarm output. The method of the invention utilizes the state monitoring time series data such as the active power, water head, and vibration swing of the hydro-generator to quickly calculate the water-conducting swing of the hydro-generator under different operating conditions, the upper limit of the normal range of the roof vibration, and the current When a penetrating crack occurs in the runner, the water guide swing and the over-limit ratio of the top cover vibration are in line with the judgment logic, and an alarm is output in time to avoid the further expansion of the crack and cause a major accident. The method of the invention has the characteristics of simple operation and strong versatility, and is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring, state evaluation and fault diagnosis of hydro-generators, and particularly relates to a method for early warning of penetrating cracks in a runner of a vertical Francis hydro-generator. Background technique [0002] In the on-line monitoring, condition assessment and fault diagnosis of hydro-generators, a crucial task is to judge whether the runner of the hydro-turbine is working normally and whether there are defects such as cracks and falling blocks, which is also an important factor in determining whether the unit needs to be shut down for maintenance. . The runner cracks seriously endanger the operation stability and safety of the power station, and frequent shutdowns to repair the cracks cause great economic losses to the power station. [0003] The traditional method lacks an effective runner defect assessment method. Generally, a combination of minor repairs and major repairs i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B11/00
CPCF03B11/008Y02E10/20
Inventor 朱晓韬吴永智刀亚娟钟新元吕爱军戴祥冷天先叶超徐文冰赵海峰
Owner HUANENG LANCANG RIVER HYDROPOWER
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