Converter valve air cooler fault positioning method

A technology for fault location and air coolers, applied in instruments, complex mathematical operations, measuring devices, etc., can solve problems such as rotor imbalance, bearing inner and outer ring pitting, bearing ball wear, etc., to avoid serious accidents, reduce maintenance costs, and guarantee The effect of fault accumulation

Pending Publication Date: 2020-07-31
DALI BUREAU OF ULTRA HIGH VOLTAGE TRANSMISSION CO CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the only rotating part in the heat dissipation system of the converter valve, it is more prone to various failures during the working process, such as rotor imbalance, loose base and other problems caused by rust and other reasons, and bearings caused by cooling water leakage. Problems such as pitting, wear, and wear of bearing balls in inner and outer rings

Method used

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  • Converter valve air cooler fault positioning method
  • Converter valve air cooler fault positioning method
  • Converter valve air cooler fault positioning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The following is an example of the early composite fault separation of the converter valve air cooler motor. A magnetic vibration sensor is used to collect vibration signals, the sampling frequency is 10000 Hz, the sampling length is 8k points, and the motor rotation frequency is 20 Hz. The fault characteristic frequency of the periodic fault is 3 times the frequency, the fault frequency of the impulse fault 1 is about 160.2Hz, and the fault characteristic frequency of the impulse fault 2 is 105.9Hz.

[0064] Firstly, the bearing vibration signal x(t) is measured by the magnetic vibration sensor, such as figure 2 shown. Use steps 2 and 3 to calculate the spectrum of the low-frequency part of the original signal, and perform spectrum analysis, such as image 3 shown.

[0065] Use step 4 to calculate the fast spectral kurtosis map of the original signal, as Figure 4 shown.

[0066] Select the color block with the largest kurtosis in the fast spectral kurtosis diagr...

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PUM

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Abstract

The invention discloses a converter valve air cooler fault positioning method. The method comprises the steps of: firstly, collecting a vibration signal waveform of a converter valve air cooler motoras original signal; calculating a spectrogram of the original signal, and judging whether a periodic fault occurs or not through characteristic frequency comparison; and finally, calculating a fast spectral kurtosis graph of the original signal, and obtaining impact fault features through multiple times of filtering decoupling. According to the method, the periodic fault characteristics and the impact fault characteristics of a converter valve air cooler are analyzed and detected respectively through the Fourier spectrogram and the fast spectral kurtosis graph, different faults under a composite fault condition can be separated, the maintenance cost can be effectively reduced, fault accumulation of the converter valve air cooler motor and a cooling fan is guaranteed, and therefore seriousaccidents are avoided.

Description

technical field [0001] The invention belongs to the technical field of electric equipment fault diagnosis, and in particular relates to a method for fault location of a converter valve air cooler. Background technique [0002] The converter valve is one of the core equipment of HVDC transmission. It needs to use the cooling medium to circulate heat and discharge it outside the valve hall to ensure that the junction temperature of the thyristor is kept within the normal allowable range and will not be damaged. Therefore, the converter valve cooling system is an important guarantee to ensure the safe and reliable operation of the converter valve. As one of the keys of the external air cooling system, the air cooler undertakes the important functions of cold and heat exchange and heat dissipation of the converter valve cooling system. However, as the only rotating part in the heat dissipation system of the converter valve, it is more prone to various failures during the working...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F17/14G01H17/00
CPCG06F17/14G01H17/00G06F2218/02G06F2218/08
Inventor 李阳崔学龙赵建明田松峰高雨杰张鹏望杨礼太徐宏争郭纯海刘志强
Owner DALI BUREAU OF ULTRA HIGH VOLTAGE TRANSMISSION CO CHINA SOUTHERN POWER GRID CO LTD
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