A mechanical fault online diagnosis method for gas-insulated combined switchgear
A gas-insulated combination and switchgear technology, applied in the field of smart substations, can solve problems such as looseness, applicability to be improved, and insufficient attention to faults, etc., and achieve the effects of low operating frequency, improved safety and reliability, and fewer samples
Inactive Publication Date: 2019-06-28
HOHAI UNIV
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Problems solved by technology
[0004] In the current research, scholars at home and abroad mostly focus on the fault diagnosis of circuit breakers, and do not pay enough attention to faults in other parts of GIS (except circuit breakers), such as loose internal and external connections.
In addition, the applicability of existing methods needs to be improved
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[0058] In order to better illustrate the technical advantages of the present invention, a loose fault of the arc extinguishing chamber of a 126kV GIS circuit breaker is taken as an example for diagnosis. The vibration acceleration sensor is placed on the flange of the loose circuit breaker, and the vibration signal is extracted by operating the circuit breaker for analysis.
[0059] figure 2 It is the vibration signal for the fastening screw of the internal arc extinguishing chamber of the GIS circuit breaker in the normal state of the circuit breaker's opening operation. right figure 2 Perform S-transformation to obtain the two-dimensional time spectrum of vibration. For specific results, see image 3 . based on image 3 Obtain the instantaneous energy density spectrum and frequency energy density spectrum of the fastening screws in the internal arc extinguishing chamber of the GIS circuit breaker under normal conditions. For specific results, see Figure 4 , Figure ...
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The present invention disclosed a mechanical failure online diagnosis method for the gas insulation combination switch equipment, which is the field of transmission and transformation equipment status monitoring technology.This method is based on the split gates of the circuit breaker as the exciting source, and the sensor is placed on the monitoring device to extract the vibration signal.The frequency plane segmentation idea is required based on the vibration signal based on the vibration signal of the Equipment of S.This article uses a normalized vibration frequency energy density spectrum and instantaneous energy density spectrum, dividing the frequency band and timing band, and extract the energy value of each feature sub -interval in normal and faulty state.Then use the energy value of the feature interval as a data set, and use the SVM optimized SVM to classify the fault.The invention can effectively diagnose GIS mechanical failures, improve the safety and reliability of GIS operation, and have important theory and practical value.
Description
technical field [0001] The invention relates to the technical field of intelligent substations, in particular to an on-line diagnosis method for mechanical faults of a gas-insulated combined switchgear (GIS). Background technique [0002] With the increase of grid capacity and voltage level, serious accidents caused by GIS failures will directly threaten the safe operation of urban power grids and may lead to large-scale power outages. As the key equipment of the power system, the reliable operation of GIS is of great significance to the safe, economical and stable operation of the power system. [0003] According to statistics, GIS mechanical failures account for 39.3% of the total failures, of which operating mechanisms such as circuit breakers account for 35.4% of mechanical failures. It can be seen that mechanical failure is one of the main factors affecting the reliability of GIS operation. The main method of mechanical fault research is mainly based on the vibration ...
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IPC IPC(8): G01M13/00G06K9/00H02B13/065
CPCH02B13/065G01M13/00G06F2218/12
Inventor 马宏忠刘宝稳许洪华王春宁赵帅吴书煜蒋梦瑶陈明赵若妤
Owner HOHAI UNIV