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A Method of State Monitoring and Fault Diagnosis of Hydraulic Turbine Based on Chaos Theory

A technology of chaos theory and water turbines, applied in hydropower, mechanical equipment, engine components, etc., can solve problems such as difficult diagnosis of water turbine cavitation faults, and achieve the effect of improving safety, service life and system stability

Active Publication Date: 2017-09-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to better understand the unstable characteristics of the internal flow field of the water turbine, and solve the problem that the cavitation fault of the water turbine is difficult to diagnose at present, and then provide a method based on chaos theory to realize the state monitoring and fault diagnosis of the water turbine

Method used

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  • A Method of State Monitoring and Fault Diagnosis of Hydraulic Turbine Based on Chaos Theory
  • A Method of State Monitoring and Fault Diagnosis of Hydraulic Turbine Based on Chaos Theory
  • A Method of State Monitoring and Fault Diagnosis of Hydraulic Turbine Based on Chaos Theory

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specific Embodiment approach 1

[0070] Specific implementation mode one: combine figure 1 , figure 2 Describe this embodiment, the water turbine state monitoring device used in the method for realizing the state monitoring of a water turbine based on the chaos theory of this embodiment includes a pressure sensor 1, a signal amplifier 2, a data collector 3 and a host computer 4; the pressure sensor 1 is arranged on In the draft tube area of ​​the turbine, the signal output end of the pressure sensor 1 is connected to the signal input end of the signal amplifier 2, the signal output end of the signal amplifier 2 is connected to the signal input end of the data collector 3, and the signal output end of the data collector 3 The end is connected with the signal input end of the host computer 4;

[0071] The specific steps of the method of realizing the state monitoring of the turbine based on the chaos theory are as follows:

[0072] Step 1: The pressure sensor 1 monitors the draft tube data of the hydraulic t...

specific Embodiment approach 2

[0084] Specific implementation mode two: combination image 3 This embodiment is described. The difference between this embodiment and the first embodiment is that in step one, the pressure sensor 1 is arranged outside the draft tube elbow.

[0085] Such as image 3 As shown, in this embodiment, the pressure sensor 1 is installed at the monitoring point 3 draft3. When the water flow leaks out from the outlet of the runner, it will have a relatively large impact on the outer wall of the elbow. On the outer side of the draft tube elbow, the lowest frequency pressure pulse The amplitude is the largest, and the characteristic phenomenon of cavitation is obvious.

specific Embodiment approach 3

[0086] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the sampling frequency of the pressure pulsation signal in step 2 is 4000 Hz.

[0087] Setting the sampling frequency of the pressure pulsation signal to 4000 Hz can collect all the pressure pulsation data of the turbine, and can avoid cavitation from interfering with the sampling results of the pressure sensor.

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Abstract

The invention discloses a method for realizing state monitoring and fault diagnosis of a water turbine based on a chaos theory, in particular, relates to a method for operating state monitoring and fault diagnosis of the water turbine, can preferably master the characteristic of instability of an internal flowing field of the water turbine, and solves the problem of difficult diagnosis of cavitation fault of a traditional water turbine. The method uses the promotion of wavelet transform for denoising pressure pulsation signals, and uses a chaos dynamics method for analyzing chaos dynamics characteristics of the water turbine in off-design operation so as to judge the caviation degree in the operation of the water turbine and to predict possible faults. The method is applied to the operation state monitoring and the fault diagnosis of the water turbine.

Description

technical field [0001] The invention relates to a water turbine operating state monitoring and fault diagnosis method, which belongs to the field of water turbine state monitoring and fault detection. Background technique [0002] The water turbine will be harmed by cavitation and cavitation erosion during operation. As time goes by, the local surface of some flow-passing parts will change, from the initial loss of luster to the gradual formation of hole-like erosion, and finally develop into some Shedding or perforation of metal parts; when cavitation and cavitation develop to the extent of destroying the normal flow of water, the energy loss of the turbine will increase sharply. [0003] The traditional maintenance is post-event maintenance or maintenance according to the plan. The post-event maintenance is the maintenance after the accident, while the planned maintenance is the regular maintenance based on human experience or certain statistical rules. Turbine is an impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B11/00
CPCY02E10/20
Inventor 兰朝凤苏文涛李小斌赵昊阳李东阳李凤臣张梦
Owner HARBIN INST OF TECH
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