Author
Liu Yun
Bio: Liu Yun is an academic researcher. The author has contributed to research in topics: Partial discharge & Electromagnetic interference. The author has an hindex of 3, co-authored 7 publications receiving 17 citations.
Papers
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Patent•
22 Nov 2019
TL;DR: In this article, a joint inspection system for transformation equipment based on an intelligent robot and an application method thereof is presented, where an inspection robot is used for inspecting a transformer substation, collecting monitoring data of the joint inspection device and uploading the collected data to the centralized control platform in a wireless mode.
Abstract: The invention discloses a joint inspection system for transformation equipment based on an intelligent robot and an application method thereof. The system comprises an inspection robot, a joint inspection device, a charging device and a centralized control platform, wherein the inspection robot is used for inspecting a transformer substation, collecting monitoring data of the joint inspection device and uploading the collected data to the centralized control platform in a wireless mode; the joint inspection device is used for being matched with the inspection robot to carry out joint inspection on the equipment state, the operating environment and the like, and comprises an intelligent sensor, a video monitoring sensor and an online monitoring device; the charging device is used for charging the inspection robot; and the centralized control platform is used for monitoring the operation of the inspection robot, analyzing, managing and displaying the detected data and carrying out management and control on the inspection mode. According to the invention, the existing monitoring resources are fully utilized, the comprehensiveness and diversity of data are improved, the inspection taskis dynamically adjusted, the utilization rate of the robot is improved, a data basis is provided for the comprehensive analysis of the equipment state, and the defect detection efficiency of the equipment is improved.
5 citations
Patent•
02 Dec 2015
TL;DR: In this paper, an acquisition method and device of substation partial discharge live detection electromagnetic interference is presented. But the acquisition method is based on a high-frequency Rogowski coil and signal conditioning is performed on the acquired electromagnetic interferences.
Abstract: The invention discloses an acquisition method and device of substation partial discharge live detection electromagnetic interference. The method includes the following steps that: coupling type electromagnetic interference signals of detected electromagnetic interferences are acquired through an ultrahigh-frequency antenna and a transient ground voltage capacitance sensor respectively, and conduction type electromagnetic interference signals of the detected electromagnetic interferences are acquired through a high-frequency Rogowski coil; and signal conditioning is performed on the acquired electromagnetic interferences, and the conditioned electromagnetic interferences are outputted. The acquisition device includes an electromagnetic interference signal sensitive unit and a signal conditioning unit; the electromagnetic interference signal sensitive unit includes the ultrahigh-frequency antenna and the transient ground voltage capacitance sensor which are used for acquiring the coupling type electromagnetic interference signals, and the high-frequency Rogowski coil which is used for detecting the conduction type electromagnetic interference signals; and the output ends of the ultrahigh-frequency antenna, the transient ground voltage capacitance sensor and the high-frequency Rogowski coil are connected with the signal conditioning unit respectively. The acquisition method and device of the invention can acquire and inhibit complex interference signals of which the frequency band is overlapped with that of partial discharge signals, and have the advantages of high detection accuracy, excellent detection sensitivity and convenient field detection.
3 citations
Patent•
06 Jan 2016
TL;DR: In this article, an electrified collection system who detects electromagnetic interference is put in office of transformer substation, including the sensitive unit (1) of electromagnetic interference signal and signal conditioning unit (2) respectively.
Abstract: The utility model discloses an electrified collection system who detects electromagnetic interference is put in office of transformer substation, including the sensitive unit (1) of electromagnetic interference signal and signal conditioning unit (2), electromagnetic interference signal sensitive unit (1) is including ultrahigh frequency antenna (11) and the transient state ground voltage capacitive sensor (12) who is used for gathering coupled mode electromagnetic interference signal, the high frequency luo shi coil (13) that is used for detecting conduction type electromagnetic interference signal, the output of ultrahigh frequency antenna (11), transient state ground voltage capacitive sensor (12), high frequency luo shi coil (13) links to each other with signal conditioning unit (2) respectively. The utility model has the advantages of can gather to restrain and put the complicated interfering signal that the signal has the band overlapping with the office, detection accuracy is high, detectivity is good, the witnessed inspections is convenient.
3 citations
Patent•
22 Aug 2017
TL;DR: In this article, a method and system for separating partial discharge sources in a transformer is presented, which comprises the steps that the original waveform of partial discharge signals is obtained, and frequency domain signals are obtained from time domain signals; energy accumulated function values of the frequency domain signal and the time domain signal are calculated respectively, and mathematical-morphology gradient calculation is carried out on the spectrum domain signals and the spectral domain signal; and the signal characteristic quantity is extracted on the basis of the energy accumulated functions and the gradient values, dimension reducing and characteristic clustering are carried out success
Abstract: The invention discloses a method and system for separating partial discharge sources in a transformer. The method comprises the steps that the original waveform of partial discharge signals is obtained, and frequency domain signals are obtained from time domain signals; energy accumulated function values of the frequency domain signals and the time domain signals are calculated respectively, and mathematical-morphology gradient calculation is carried out on the frequency domain signals and the time domain signals; and the signal characteristic quantity is extracted on the basis of the energy accumulated function values and the gradient values, dimension reducing and characteristic clustering are carried out successively, and multiple separated partial discharge sources are obtained. The system comprises a waveform obtaining program module, an accumulated function calculating program module, a gradient calculating program module, a characteristic quantity extracting program module, a characteristic quantity dimension reducing program module and a clustering program module. According to the invention, the problems that the transformer structure is complex, transmission paths of the partial discharge signals are complexes and original signals distort seriously are overcome, the multiple discharge sources of equipment, as the transformer, of complex structure can be separated and identified, and the method and system have the advantages of high structural adaptability and high separating accuracy.
3 citations
Patent•
03 Dec 2019
TL;DR: In this article, a GIS partial discharge severity determination method and system based on principal component dimension reduction and clustering analysis and a medium is presented, which comprises steps: acquiring a partial discharge spectrum of a to-be-detected GIS Partial Discharge signal; extracting a key characteristic quantity for the partial discharge signal; performing dimension reductionprocessing on the key characteristic quantities to obtain a dimension-reduced partial discharge characteristic fingerprint; respectively calculating distances between the partial-discharge characteristic fingerprint and characteristic fingerprint clustering centers, obtained by clustering on partial discharge characteristics corresponding to the
Abstract: The invention discloses a GIS partial discharge severity determination method and system based on principal component dimension reduction and clustering analysis and a medium. The method comprises steps: acquiring a partial discharge spectrum of a to-be-detected GIS partial discharge signal; extracting a key characteristic quantity for the partial discharge spectrum; performing dimension reductionprocessing on the key characteristic quantity to obtain a dimension-reduced partial discharge characteristic fingerprint; respectively calculating distances between the partial discharge characteristic fingerprint and characteristic fingerprint clustering centers, obtained by clustering on partial discharge characteristic fingerprints corresponding to the discharge stages, at corresponding different discharge stages; and determining a discharge stage corresponding to the to-be-detected GIS partial discharge signal according to a shortest distance. With the disclosed method, the severity of defect discharge can be determined effectively while the discharge type identification is completed. The method has advantages of high calculation efficiency and calculation accuracy; and the referencefor maintenance decision and construction period arrangement can be provided.
2 citations
Cited by
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Patent•
02 Dec 2015
TL;DR: In this paper, an acquisition method and device of substation partial discharge live detection electromagnetic interference is presented. But the acquisition method is based on a high-frequency Rogowski coil and signal conditioning is performed on the acquired electromagnetic interferences.
Abstract: The invention discloses an acquisition method and device of substation partial discharge live detection electromagnetic interference. The method includes the following steps that: coupling type electromagnetic interference signals of detected electromagnetic interferences are acquired through an ultrahigh-frequency antenna and a transient ground voltage capacitance sensor respectively, and conduction type electromagnetic interference signals of the detected electromagnetic interferences are acquired through a high-frequency Rogowski coil; and signal conditioning is performed on the acquired electromagnetic interferences, and the conditioned electromagnetic interferences are outputted. The acquisition device includes an electromagnetic interference signal sensitive unit and a signal conditioning unit; the electromagnetic interference signal sensitive unit includes the ultrahigh-frequency antenna and the transient ground voltage capacitance sensor which are used for acquiring the coupling type electromagnetic interference signals, and the high-frequency Rogowski coil which is used for detecting the conduction type electromagnetic interference signals; and the output ends of the ultrahigh-frequency antenna, the transient ground voltage capacitance sensor and the high-frequency Rogowski coil are connected with the signal conditioning unit respectively. The acquisition method and device of the invention can acquire and inhibit complex interference signals of which the frequency band is overlapped with that of partial discharge signals, and have the advantages of high detection accuracy, excellent detection sensitivity and convenient field detection.
3 citations
Patent•
08 Jun 2018
TL;DR: In this paper, a fuzzy clustering algorithm is used to cluster the extracted time-frequency parameter and separate the UHF signal of partial discharge from an interference signal while the signal processing speed is taken into consideration.
Abstract: The invention provides a multiple source separating method and device of partial discharge. The method comprise that a time-frequency parameter is extracted and calculated from a collected ultrahigh frequency (UHF) radio wave signal of partial discharge; and a fuzzy clustering algorithm is used to cluster the extracted time-frequency parameter and separate the UHF signal of partial discharge. According to the method and device, the problem that multiple discharge sources discharge synchronously and are hard to diagnose in the partial discharge detection process in the related art is solved, and the multi-source partial discharge signal can be separated from an interference signal while the signal processing speed is taken into consideration.
3 citations
Patent•
24 Aug 2016
TL;DR: In this article, a method for grading transformer station partial discharge live detection electromagnetic interference signals is proposed, which uses the interference signal intensity and discrete degree as the basis of interference grading, objectively and accurately grades the interference grades, quantitatively describes the interference signals, and provides a reference basis for a standardized interference test platform.
Abstract: The invention discloses a method for grading transformer station partial discharge live detection electromagnetic interference signals. The method performs classified statistic on various kinds of electromagnetic interference signals in various detection methods, uses the interference signal intensity and discrete degree thereof as the basis of interference grading, objectively and accurately grades the interference grades of the electromagnetic interference signals, quantitatively describes the electromagnetic interference signals, and provides a reference basis for a standardized interference test platform and establishment of a partial discharge detection device anti-interference performance evaluation system.
1 citations
Patent•
19 Jun 2020
TL;DR: In this paper, a judgment method for a partial discharge development stage of oil paper insulation is presented, which considers the influence of moisture in the insulating oil on the partial discharge process.
Abstract: The invention discloses a judgment method for a partial discharge development stage of oil paper insulation. A device capable of simultaneously testing partial discharge of oil paper insulation and amoisture content in oil is designed; an adopted test electrode is a column plate electrode; a pressurizing device is used for pressurizing the oil paper insulation; the partial discharge development process of oil paper insulation and the moisture content in oil are monitored through a partial discharge tester and an in-oil moisture tester respectively. The measured data are transmitted to a computer, and the oil paper insulation partial discharge development stage is determined according to the characteristic parameters measured by a PRPD spectrogram in the taken time period after the partialdischarge development stage is divided. The device involved in the method considers the influence of moisture in the insulating oil on the partial discharge development process, so that the method can more accurately judge the partial discharge development stage of the oil paper insulation, and the existence of serious defects of the oil paper insulation can be predicted in advance.
1 citations
Patent•
18 Dec 2018
TL;DR: In this article, a cable oscillating wave local discharge fault positioning system consisting of a high-frequency current sensor, a presignal wave detector and a variable gain amplifier is presented.
Abstract: The invention discloses a cable oscillating wave local discharge fault positioning system. The cable oscillating wave local discharge fault positioning system comprises a high-frequency current sensor; the high-frequency current sensor inputs a sensed local discharge signal to a presignal wave detector; the presignal wave detector judges the signal, and controls a subsequent variable gain amplifier to select direct connection or an amplification factor; then, the signal is amplified by the variable gain amplifier and then enters a high-speed AD collection card for AD conversion; and data are transmitted to an upper computer for analysis, processing and display. According to the cable oscillating wave local discharge fault positioning system, by increasing the presignal wave detector and the variable gain amplifier, an amplitude of a reflection signal is significantly improved, and an AD collection effect is improved; and meanwhile, correlation operation is adopted for sampled data andwaveform matching is performed on a waveform characteristic algorithm, so that a matching effect is improved to the utmost extent, an identification effect on the sensed signal in two times is greatlyimproved, and the fault positioning precision is effectively improved.
1 citations