Journal articles: 'GIS method'

1

Ding, Pei, Zhen Hua Yan, Fei Yue Ma, Liang Zhang, Jun Hao Li, and Yan Ming Li. "The Study of Vibration Diagnosis Method for GIS." Applied Mechanics and Materials 295-298 (February 2013): 2429–32. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.2429.

Full text

Abstract:

Gas insulated switchgear (GIS) will generate vibration during normal operation for the electromagnetic force. There will be generate abnormal vibration when the contacts are undesirable, the guide rod stressed unevenness. Therefore, it can be effective in fault diagnosis of this machineries through the vibration test of GIS in field. The vibration detection method of GIS equipment in field is studied in this paper, the composition of the vibration detection system is described. The field test has been done using vibration detection system and the test results show that through the vibration signal detected from the GIS equipment, the vibration characteristics of GIS can be clarified and make the fault diagnosis effectively.

APA, Harvard, Vancouver, ISO, and other styles

2

Sang, Zhongqing, Xiaodong Gu, Yongxin Wang, Weiyun Jiang, and Wenjuan Cheng. "Waveform Correlation Analysis Method for Mechanical Characteristics of Circuit Breaker in Intelligent GIS Equipment." Journal of Physics: Conference Series 2218, no. 1 (March 1, 2022): 012054. http://dx.doi.org/10.1088/1742-6596/2218/1/012054.

Full text

Abstract:

Abstract Gas-insulated electrical appliances (GIS) have the characteristics of small footprint and low cost. Therefore, GIS is widely used in intelligent substations. However, once the GIS fails, there will be shortcomings of long maintenance cycle, which seriously affects the normal life and production activities. Based on this, on the basis of summarizing and analyzing the GIS intelligent technology, this paper studies the correlation analysis method of the mechanical characteristic waveform of the intelligent GIS equipment circuit breaker from the aspects of equipment intelligence, device development and software development,corresponding theoretical guidance is provided for the practical application of intelligent GIS equipment circuit breakers.

APA, Harvard, Vancouver, ISO, and other styles

3

Mihai, Dana, and Mihai Mocanu. "Processing GIS Data Using Decision Trees and an Inductive Learning Method." International Journal of Machine Learning and Computing 11, no. 6 (November 2021): 393–98. http://dx.doi.org/10.18178/ijmlc.2021.11.6.1067.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Rahmat, Saepul, and Riyani Prima Dewi. "Distribusi Medan Listrik di Kompartemen Busbar Gas Insulated Switchgear (GIS) Menggunakan Charge Simulation Method." E-JOINT (Electronica and Electrical Journal Of Innovation Technology) 1, no. 2 (December 27, 2020): 47–52. http://dx.doi.org/10.35970/e-joint.v1i2.436.

Full text

Abstract:

Penelitian ini bertujuan untuk mengilustrasikan distribusi medan listrik di kompartemen busbar tipe gas insulated switchgear (GIS). Gas Insulated Substation (GIS) merupakan rangkaian peralatan gardu induk yang terpasang di dalam sebuah metal enclosure dan diisolasi oleh gas bertekanan yaitu Sulfur Hexafluoride (SF6). Dalam simulasi ini, diasumsikan titik referensi berada di sekitar contact pin busbar, dan titik muatan buatan berada disekitar kompartemen busbar. Simulasi dilakukan dengan menentukan titik referensi dan titik muatan bantuan untuk menghitung nilai muatan yang akan dicari yaitu contact pin. Titik muatan buatan ini terletak disembarang titik disekitar kompartemen busbar GIS dan akan dihitung nilai muatannya melalui metode simulasi muatan (charge simulation method) dengan bantuan komputasi Matlab

APA, Harvard, Vancouver, ISO, and other styles

5

Lv, Fang Cheng, Hu Jin, and Zhao Hua Zhang. "Typical Insulation Defects Partial Discharge Feature Extraction Research Based on AE Method." Applied Mechanics and Materials 668-669 (October 2014): 737–40. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.737.

Full text

Abstract:

Gas insulated switchgears (GIS) occupy an important position in the power system. Feature extraction is the key to GIS partial discharge pattern recognition, but the dimension of feature space is high, based on this, the article introduce the principal component sparse thoughts, firstly, through the 252 kV GIS partial discharge simulation experiment platform, set up the typical GIS partial discharge models, and uses AE method to obtain the signals, and through the principal component contribution rate to decide the degree of sparse, and according to the sparse component and the number of original features to decide the characteristics of related components, the results show that using this method can realize effective extraction of characteristic, and enhance the clustering results.

APA, Harvard, Vancouver, ISO, and other styles

6

Li, Songyuan, Pengxian Song, Zhanpeng Wei, Xu Li, Qinghua Tang, Zhengzheng Meng, Ji Li, Songtao Liu, Yuhuai Wang, and Jin Li. "Partial Discharge Detection and Defect Location Method in GIS Cable Terminal." Energies 16, no. 1 (December 29, 2022): 413. http://dx.doi.org/10.3390/en16010413.

Full text

Abstract:

The complex structure of gas-insulated switchgear (GIS) cable terminals leads to serious electric field concentration, which is a frequent fault position of a high-voltage cable system. At present, due to the differences in the frequency bands of sensors, various partial discharge detection technologies have certain differences in their scope of application and anti-interference performance, resulting in a low defect detection rate in GIS cable terminals. In this paper, a comprehensive diagnosis scheme is proposed, which integrates transient earth voltage (TEV), ultra-high frequency (UHF), high frequency (HF), and ultrasonic methods. Two abnormal discharge defects of GIS terminals in two 220 kV substations in Tianjin were tracked and monitored, and the joint diagnosis was carried out using the proposed scheme; the type of discharge defect and the phase sequence of the defect were determined, and the UHV was employed to precisely locate and analyze the defect source. Finally, through the disassembly analysis and electric field simulation of the GIS cable terminal, the accuracy and effectiveness of the discharge detection and location method were verified, providing a typical detection demonstration for the defect diagnosis of a GIS cable terminal.

APA, Harvard, Vancouver, ISO, and other styles

7

Gong, Duohu, Wentao Chen, Zhongqiang Zhan, and Dilyar·Dolkun. "Analysis of ultrasonic partial discharge characteristics of GIS’s reducing unit based on Finite Element Method." Journal of Physics: Conference Series 2237, no. 1 (March 1, 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2237/1/012016.

Full text

Abstract:

Abstract GIS’s reducing unit is a new and environment-friendly structural unit, which can greatly reduce the consumption of aluminum alloy material and insulating gas. The structural size of this unit is much smaller than the conventional one. In this paper, an acoustic-structure coupling interaction model of partial discharge in reducing unit of gas insulated switchgear (GIS) is presented. The interaction between the internal acoustic source of partial discharge and structure of GIS is simulated with the finite element analysis, and the acoustic pressure levels distribution of GIS is obtained. The results show that the sound pressure distribution of the reducing unit is basically the same as that of the conventional one, but the amplitude is larger. At the same time, the high-frequency part of the acoustic signal attenuates more quickly in the reducing unit. This paper provides a theoretical guidance basis for the ultrasonic partial discharge detection of the GIS reducing unit.

APA, Harvard, Vancouver, ISO, and other styles

8

Yu, Xiao. "GIS-Based Medical Resource Evaluation Method." Scientific Programming 2022 (August 3, 2022): 1–8. http://dx.doi.org/10.1155/2022/2742557.

Full text

Abstract:

As one of the public service resources, medical and health care has a great guarantee for people’s healthy life and life safety and is an important part of ensuring the normal and orderly operation of urban functions. This paper takes the spatial pattern of urban medical resources in Hohhot as the research object and collects three types of urban medical resources, including clinics (health centers), specialized hospitals, and general hospitals, a total of 1300 sample points, based on GIS spatial analysis methods, using the average nearest neighbor, kernel density estimation method, standard deviation ellipse method, and accessibility measure to analyze the spatial distribution of medical resources. The results show that the medical resources in the urban area of Hohhot are all in a state of agglomeration, but due to the different functions of different types of medical resources, their distribution ranges and distribution directions also show different characteristics. Saihan District, Yuquan District in the southwest, has fewer medical facilities resources, and the distribution of the accessibility of the three types of medical facilities is quite different. Therefore, the spatial balance of comprehensive medical resources in the urban area of Hohhot needs to be further improved. The results of this paper have implications for the layout of medical facilities and planning has important reference significance.

APA, Harvard, Vancouver, ISO, and other styles

9

He, Liang, Jie Yang, Ziwei Zhang, Zongwu Li, Dengwei Ding, Minghu Yuan, Rong Li, and Mao Chen. "Research on Mechanical Defect Detection and Diagnosis Method for GIS Equipment Based on Vibration Signal." Energies 14, no. 17 (September 3, 2021): 5507. http://dx.doi.org/10.3390/en14175507.

Full text

Abstract:

Gas insulated switchgear equipment (GIS) is widely used in power system, and more attention has been paid to discharge defects than mechanical defects. However, since mechanical defects are a major cause of the failure in GIS, it is of great significance to carry out relevant research on mechanical defects. Detection and diagnosis methods of mechanical defects based on vibration signal are studied in this paper. Firstly, vibration mechanisms of GIS are analyzed. Due to structural differences between single phase insulated type GIS and three phase insulated type GIS, there are big differences in vibration mechanisms between the two types of GISs. Secondly, experimental research on mechanical defects is carried out based on a 110 kV GIS equipment and a self-developed vibration detection system; results show that mechanical defects can be diagnosed by analyzing signal amplitude, frequency spectrum and waveform distortion rate, and a large current is more beneficial for diagnosing mechanical defects. Lastly, field application has been carried out on 220 kV GIS equipment, and a poor contact defect is found, demonstrating that abnormal diagnosis can be realized by method proposed in this paper. Experimental research and field application demonstrate the feasibility and effectiveness of detection and diagnosis method for mechanical defects based on vibration signal and provide experience for subsequent engineering application.

APA, Harvard, Vancouver, ISO, and other styles

10

Ana, Ricardo Santa, Marvin Muchametow, and Manjunath Ramesh. "New Method of Leak Rate Measurement in SF₆ Free Medium Voltage Switchgear Using Helium and Ambient Air." B&H Electrical Engineering 15, no. 1 (October 1, 2021): 54–62. http://dx.doi.org/10.2478/bhee-2021-0006.

Full text

Abstract:

Abstract The current medium voltage Gas Insulated Switchgears (GIS) predominantly use Sulphur Hexafluoride (SF6) as insulation medium. The leakage tests performed on GIS use either SF6 or Helium medium to ensure gas tightness. However, SF6 has been strictly regulated for the last years due to the high global warming potential effect on the planet. As a response, new technologies are emerging using air as insulation medium. The present work establishes a basic comparison of the leakage rate in a medium voltage GIS using two different leak detection methods: Helium leak detector and Residual Gas Analyser (RGA). Both methods use Helium and additionally RGA using air as tracer gas.

APA, Harvard, Vancouver, ISO, and other styles

11

Choi, Jin-Beom, Ill Son, and Jin-Hwan Noh. "Health Risk Assessments using GIS Method for the Abandoned Asbestos Mines." Journal of the Mineralogical Society of Korea 24, no. 1 (March 31, 2011): 43–53. http://dx.doi.org/10.9727/jmsk.2011.24.1.043.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Ali Hamid, Arieann, Gaylan Rasul Faqe Ibrahim, and Umkalthum Mustafa Darwesh. "A Proposed Bike sharing Project using GIS-based method in Sheffield City UK." Halabja University Journal 5, no. 3 (April 1, 2016): 125–39. http://dx.doi.org/10.32410/huj-10322.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Dobesova, Zdena. "CARTOEVALUATION METHOD FOR ASSESSMENT OF GIS SOFTWARE." Geodesy and Cartography 39, no. 4 (December 18, 2013): 164–70. http://dx.doi.org/10.3846/20296991.2013.859824.

Full text

Abstract:

The article offers proposals for a new approach to evaluating GIS programs in cartographic functions. The newly proposed CartoEvaluation method is a comprehensive guide in monitoring all cartographic features and in subsequent selection of the program. The CartoEvaluation method is based on Gold-Question-Metric method. CartoEvaluation method was applied for assessment of some desktop GIS software. The result of assessment brings the rank of software. Method can help a user in the choice of GIS program when a user requires a higher cartographic functionality.

APA, Harvard, Vancouver, ISO, and other styles

14

Mironova, Yu N. "The Classification of GIS Objects." Journal of Physics: Conference Series 2096, no. 1 (November 1, 2021): 012002. http://dx.doi.org/10.1088/1742-6596/2096/1/012002.

Full text

Abstract:

Abstract This paper discusses the current issues of the application of classification and data processing in geoinformation systems. The problems of classification of various objects have been studied in the works of many authors. These include a fairly wide range of problems: decryption of satellite images, pattern recognition, mathematical modeling, etc. In this paper, we study the methods and techniques for classifying objects listed in the literature, as well as preliminary data processing: feature normalization, feature weighting, aggregation, dimensionality reduction, etc. The result of finding spatial features in an attribute space is often a representation of spatial features in the form of an object-feature matrix that reflects the measurement of M features on N spatial features and contains N rows and M columns. To classify spatial objects, you must have a geographical map of these objects and an object-attribute matrix, the rows of which correspond to the spatial objects. In order to properly classify, you need to perform pre-processing of the data, including normalization, weighting, dimensionality reduction, aggregation, and identification. After preliminary data processing, the objects are classified. The paper lists and describes such classification methods as nuclear classification methods, hierarchical divisive classification methods, hierarchical agglomerative classification methods, near neighbor method, far neighbor method, centroid method, group mean method (mean link method) and other issues related to the classification of geoinformation objects.

APA, Harvard, Vancouver, ISO, and other styles

15

Zhao, Hengyang, Guobao Zhang, and Xi Yang. "GIS Fault Prediction Approach Based on IPSO-LSSVM Algorithm." Sustainability 15, no. 1 (December 23, 2022): 235. http://dx.doi.org/10.3390/su15010235.

Full text

Abstract:

With the improvement of industrialization, the importance of equipment failure prediction is increasing day by day. Accurate failure prediction of gas-insulated switchgear (GIS) in advance can reduce the economic loss caused by the failure of the power system to operate normally. Therefore, a GIS fault prediction approach based on Improved Particle Swarm Optimization Algorithm (IPSO)-least squares support vector machine (LSSVM) is proposed in this paper. Firstly, the future gas conditions of the GIS to determine the characteristic data of SF6 decomposition gas are analyzed; Secondly, a GIS fault prediction model based on LSSVM is established, and the IPSO algorithm is used to normalize the parameters LSSVM. The parameters of c and radial basis kernel function σ2 are optimized, which can meet the needs of later search accuracy while ensuring the global search capability in the early stage. Finally, the effectiveness of the proposed method is verified by the fault data of gas-insulated switch. Simulation results shows that, compared with the prediction methods based on IGA-LSSVM and PSO-LSSVM, the prediction accuracy rate of the proposed method reached 92.1%, which has the smallest prediction absolute error, higher accuracy and stronger prediction ability.

APA, Harvard, Vancouver, ISO, and other styles

16

Feng, Ying, and Jianwen Wu. "Vibration Feature Analysis for Gas-Insulated Switchgear Mechanical Fault Detection under Varying Current." Applied Sciences 10, no. 3 (February 1, 2020): 944. http://dx.doi.org/10.3390/app10030944.

Full text

Abstract:

As a key component to ensure the safe operation of the power grid, mechanical defect diagnosis technology of gas-insulated switchgear (GIS) during operation is often neglected. At present, GIS mechanical fault detection based on vibration information has not been developed. The main reason is that the excitation current is considerable but uncontrollable in the actual operation of GIS. It is difficult to eliminate the influence of excitation on the vibration amplitude and form an effective vibration feature description technology. Therefore, this paper proposes a unified feature-extraction method for GIS vibration information that reduces the influence of current amplitude for mechanical fault diagnosis. Starting from the GIS mechanical analysis, the periodicity of vibration excitation and the influence of amplitude are discussed. Then, combined with the non-linear characteristics of GIS systems and non-linear vibration theory, the multiplier frequency energy ratio (MFER) is designed to extract vibration-unified features of GIS for diagnosing the mechanical fault under different current levels. The diagnosis results of the experimental data with different feature-extraction methods show the applicability and superiority of the proposed method in the GIS’s mechanical fault-detection field based on vibration information.

APA, Harvard, Vancouver, ISO, and other styles

17

Yuan, Yang, Suliang Ma, Jianwen Wu, Bowen Jia, Weixin Li, and Xiaowu Luo. "Frequency Feature Learning from Vibration Information of GIS for Mechanical Fault Detection." Sensors 19, no. 8 (April 25, 2019): 1949. http://dx.doi.org/10.3390/s19081949.

Full text

Abstract:

The reliability of gas insulated switchgear (GIS) is very important for the safe operation of power systems. However, the research on potential faults of GIS is mainly focused on partial discharge, and the research on the intelligent detection technology of the mechanical state of GIS is very scarce. Based on the abnormal vibration signals generated by a GIS fault, a fault diagnosis method consisting of a frequency feature extraction method based on coherent function (CF) and a multi-layer classifier was developed in this paper. First, the Fourier transform was used to analyze the differences and consistency in the frequency spectrum of signals. Secondly, the frequency domain commonalities of the vibration signals were extracted by using CF, and the vibration characteristics were screened twice by using the correlation threshold and frequency threshold to further select the vibration features for diagnosis. Then, a multi-layer classifier composed of two one-class support vector machines (OCSVMs) and one support vector machine (SVM) was designed to classify the faults of GIS. Finally, the feasibility of the feature extraction method was verified by experiments, and compared with other classification methods, the stability and reliability of the proposed classifier were verified, which indicates that the fault diagnosis method promotes the development of an intelligent detection technology of the mechanical state in GIS.

APA, Harvard, Vancouver, ISO, and other styles

18

Yuan, Ji. "Automatic update method of GIS platform drawing model based on machine learning." Journal of Computational Methods in Sciences and Engineering 22, no. 2 (March 28, 2022): 425–35. http://dx.doi.org/10.3233/jcm-215735.

Full text

Abstract:

Aiming at the problem that the number of data bytes in the traditional automatic update technology of GIS platform is small, a method of automatic update of GIS platform graph model based on machine learning is studied. Firstly, the data of the GIS platform model is convolved by the iso-linear feature detection operator in the automatic updating technology of the GIS platform model, and the calculated data of the GIS platform model is expressed as spatial data. A reasonable updating criterion is established, the spatial relationship of GSI data is reconstructed by the measure of updating criterion, the data vector of GIS platform model updated within the updating time range is calculated, and the regional data elements in the space are constantly changed to complete the data updating of GIS platform model. The experimental results show that compared with the automatic updating method of GIS platform model, the proposed method can update more data bytes with the same number of data bytes.

APA, Harvard, Vancouver, ISO, and other styles

19

刘, 晓亮. "Research on the Intelligent Detection Method of GIS Partial Discharge." Journal of Electrical Engineering 10, no. 01 (2022): 50–60. http://dx.doi.org/10.12677/jee.2022.101006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Man, Yuyan, Chi Zhang, Qinghua Tang, Jin He, Meng Cao, and Qi Zhao. "Application of Ultrasonic Testing Method in Particle Detection of GIS Handover Test." Journal of Physics: Conference Series 2440, no. 1 (January 1, 2023): 012010. http://dx.doi.org/10.1088/1742-6596/2440/1/012010.

Full text

Abstract:

Abstract Ultrasonic partial discharge detection is a necessary test in GIS handover test, which is very significant to detect the internal defects of GIS. This article introduces in detail how the ultrasonic partial discharge detection method is applied to the GIS handover test through a case in which the internal particles are found through the ultrasonic partial discharge detection method in the GIS handover test. It also fully proves that the ultrasonic partial discharge detection method is very effective for discovering the internal particles of GIS through this case. The experience of this case can provide a very meaningful experience for the subsequent GIS handover, operation and maintenance tests.

APA, Harvard, Vancouver, ISO, and other styles

21

Lee, Seul-Ji, and Ji-Yeong Lee. "Vulnerability Analysis on Fire Service Zone using Map Overlay Method in GIS." Korean Journal of Geomatics 29, no. 1 (February 28, 2011): 91–100. http://dx.doi.org/10.7848/ksgpc.2011.29.1.91.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Lu, Yao, Zhibin Qiu, Caibo Liao, Zhibiao Zhou, Tonghongfei Li, and Zijian Wu. "A GIS Partial Discharge Defect Identification Method Based on YOLOv5." Applied Sciences 12, no. 16 (August 21, 2022): 8360. http://dx.doi.org/10.3390/app12168360.

Full text

Abstract:

The correct identification of partial discharge types is of great significance to the stable operation of GIS. In order to improve the recognition accuracy and result of partial discharge, and to meet the requirements of real-time monitoring of GIS equipment, this paper proposes a GIS partial discharge defect recognition model based on YOLOv5. First, the GIS partial discharge simulation experiment is established to create the dataset of partial discharge PRPD map. Then, a YOLOv5-based GIS partial discharge defect recognition model is constructed, and different training methods are used to optimize the parameters of the model. By comparing with target detection models based on other deep learning methods, such as Faster-RCNN and YOLOv4, the YOLOv5 model discussed in the paper has significantly improved the recognition efficiency and recognition accuracy, in which mAP value is 95.89% and FPS is 28.89. In addition, the model can realize the distinction and identification of multiple PD types in a single PRPD map. At last, the YOLOv5-based GIS partial discharge defect identification model is applied to the test in a 500 kV substation. The model accurately determines the type of GIS partial discharge, which verifies the accuracy and validity of the model.

APA, Harvard, Vancouver, ISO, and other styles

23

Arefiev, Nikolay, Vitaly Terleev, and Vladimir Badenko. "GIS-based Fuzzy Method for Urban Planning." Procedia Engineering 117 (2015): 39–44. http://dx.doi.org/10.1016/j.proeng.2015.08.121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Kaufman, Martin M., and Troy Rosencrants. "GIS method for characterizing fire flow capacity." Fire Safety Journal 72 (February 2015): 25–32. http://dx.doi.org/10.1016/j.firesaf.2015.02.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Tian, Fangyuan, Yanpeng Hao, Zhouyiao Zou, Yao Zheng, Weiming He, Lin Yang, and Licheng Li. "An Ultrasonic Pulse-Echo Method to Detect Internal Defects in Epoxy Composite Insulation." Energies 12, no. 24 (December 17, 2019): 4804. http://dx.doi.org/10.3390/en12244804.

Full text

Abstract:

Voids or cracks in basin insulators inside a GIS (gas-insulated metal-enclosed switchgear) could trigger partial discharges or surface flashover under electrical stresses, threatening safe GIS operation. For this paper, some epoxy composite specimens were made from similar materials and manufacturing processes to make 252 kV GIS basin insulators. Some voids with different diameters or cracks with different diameters and orientations were artificially made in the specimens with different thicknesses. An ultrasonic pulse-echo system was set up, and ultrasonic tests were carried out on the specimens with voids or cracks. A method to calculate the depth of a defect was proposed by the propagation time of defect reflected waves. The results showed that a depth of 50 mm, a diameter φ of 2 mm void, and a diameter φ of 1 mm crack in epoxy composite insulation were detected by the ultrasonic system using a 1 MHz transducer.

APA, Harvard, Vancouver, ISO, and other styles

26

He, Jin, Songyuan Li, Chi Zhang, Meng Cao, Rong Chen, and Xuliang Zhu. "A Case Analysis of Particle Defects Found in 220kV GIS by Ultrasonic Partial Discharge and SF6 Gas Decomposition Products Joint Detection." Journal of Physics: Conference Series 2440, no. 1 (January 1, 2023): 012012. http://dx.doi.org/10.1088/1742-6596/2440/1/012012.

Full text

Abstract:

Abstract The particles inside GIS have become the biggest factor affecting the safe and stable operation of GIS. How to effectively and timely find the particle defects is very important to ensure the reliable operation of GIS. This article describes in detail how to find particles in GIS through ultrasonic partial discharge method and comprehensive diagnosis of SF6 gas decomposition products, and gives specific solutions, which will provide very useful experience for subsequent GIS operation and maintenance.

APA, Harvard, Vancouver, ISO, and other styles

27

Yuan, Feng, Pengran Ma, Xuyang Zhang, Hong Jia, Haifeng Wang, Pengqiao Zhang, Xiangyang Li, et al. "Research on UHF PD detection method based on improved DBN." IOP Conference Series: Earth and Environmental Science 983, no. 1 (February 1, 2022): 012005. http://dx.doi.org/10.1088/1755-1315/983/1/012005.

Full text

Abstract:

Abstract With the development of power grid technology and the widespread application of gas insulator switchgear (GIS) equipment, the power supply reliability of the power system has been greatly improved, but the problem of partial discharge (PD) faults in GIS has always been prominent, seriously affecting the safe and stable operation of the power grid. How to quickly determine the type and cause of GIS discharge is the key to online PD detection. In this paper, in order to deal with the very complicated data processing of ultra-high frequency (UHF) PD, the time-consuming and low efficiency of manually judging the type of PD, a classification model of UHF PD system based on deep confidence network (DBN) is established and an automatic classification method for UHF PD based on improved DBN is proposed; the activation function Sigmoid is improved to effectively prevent the occurrence of the gradient disappearance problem; the optimized DBN parameters are used to train and classify data of different PD types. The classification accuracy rate of the test results reached 96.7%, realizing the rapid classification evaluation of UHF PD types.

APA, Harvard, Vancouver, ISO, and other styles

28

Wu, Xu Tao, Bo Ma, Jin Peng Hao, Liang Zhang, Jun Hao Li, and Yan Ming Li. "The PD Pattern Characteristics of Typical Defects in GIS Based on Acoustic Detection." Applied Mechanics and Materials 295-298 (February 2013): 2425–28. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.2425.

Full text

Abstract:

Gas insulated switchgear (GIS) is the most important equipment in the power system. The partial discharge (PD) is the main detection method for the insulation failure. Especially, for insulation condition assessment, the pattern recognition technology of partial discharge in GIS is the most important. Acoustic detection of GIS PD is the effective method and it has long application history. The acoustic detection method is very suitable for defects detection in GIS, for it has the advantages of on-line detection and easy realization of locating the defects.The PD pattern characteristic is the key factor for the analysis of defect type. The PD pattern characteristics of four typical defects in GIS based on acoustic detection are studied in this paper. The results provide a test basis for the recognition of PD types and a deeper study of the mechanism of PD.

APA, Harvard, Vancouver, ISO, and other styles

29

Najadat, Hassan, Rasha Obeidat, and Ismail Hmeidi. "Clustering Generalised Instances Set Approaches for Text Classification." Journal of Information & Knowledge Management 10, no. 01 (March 2011): 91–107. http://dx.doi.org/10.1142/s0219649211002857.

Full text

Abstract:

This paper introduces three new text classification methods: Clustering-Based Generalised Instances Set (CB-GIS), Multilevel Clustering-Based Generalised Instances Set (MLC_GIS) and Multilevel Clustering-Based, k Nearest Neighbours (MLC-kNN). These new methods aim to unify the strengths and overcome the drawbacks of the three similarity-based text classification methods, namely, kNN, centroid-based and GIS. The new methods utilise a clustering technique called spherical K-means to represent each class by a representative set of generalised instances to be used later in the classification. The CB-GIS method applies a flat clustering method while MLC-GIS and MLC-kNN apply multilevel clustering. Extensive experiments have been conducted to evaluate the new methods and compare them with kNN, centroid-based and GIS classifiers on the Reuters-21578(10) benchmark dataset. The evaluation has been performed in terms of the classification performance and the classification efficiency. The experimental results show that the top-performing classification method is the MLC-kNN classifier, followed by the MLC-GIS and CB-GIS classifiers. According to the best micro-averaged F1 scores, the new methods (CB-GIS, MLC-CIS, MLC-kNN) have improvements of 4.48%, 4.65% and 4.76% over kNN, 1.84%, 1.92% and 2.12% over the centroid-based and 5.26%, 5.34% and 5.45% over GIS respectively. With respect to the best macro-averaged F1 scores, the new methods (CB-GIS, MLC-CIS, MLC-kNN) have improvements of 10.29%, 10.19% and 10.45% over kNN, respectively, 0.1%, 0.03% and 0.29% over the centroid-based and 3.75%, 3.68% and 3.94% over GIS respectively.

APA, Harvard, Vancouver, ISO, and other styles

30

Wang, Yanxin, Jing Yan, Zhou Yang, Tingliang Liu, Yiming Zhao, and Junyi Li. "Partial Discharge Pattern Recognition of Gas-Insulated Switchgear via a Light-Scale Convolutional Neural Network." Energies 12, no. 24 (December 9, 2019): 4674. http://dx.doi.org/10.3390/en12244674.

Full text

Abstract:

Partial discharge (PD) is one of the major form expressions of gas-insulated switchgear (GIS) insulation defects. Because PD will accelerate equipment aging, online monitoring and fault diagnosis plays a significant role in ensuring safe and reliable operation of the power system. Owing to feature engineering or vanishing gradients, however, existing pattern recognition methods for GIS PD are complex and inefficient. To improve recognition accuracy, a novel GIS PD pattern recognition method based on a light-scale convolutional neural network (LCNN) without artificial feature engineering is proposed. Firstly, GIS PD data are obtained through experiments and finite-difference time-domain simulations. Secondly, data enhancement is reinforced by a conditional variation auto-encoder. Thirdly, the LCNN structure is applied for GIS PD pattern recognition while the deconvolution neural network is used for model visualization. The recognition accuracy of the LCNN was 98.13%. Compared with traditional machine learning and other deep convolutional neural networks, the proposed method can effectively improve recognition accuracy and shorten calculation time, thus making it much more suitable for the ubiquitous-power Internet of Things and big data.

APA, Harvard, Vancouver, ISO, and other styles

31

Abdurakhmonov, Sarvar, Ilhom Abdurahmanov, Dilrabo Murodova, Anvar Pardaboyev, Nuriddin Mirjalolov, and Abdulla Djurayev. "Development of demographic mapping method based on GIS technologies." InterCarto. InterGIS 26, no. 1 (2020): 319–28. http://dx.doi.org/10.35595/2414-9179-2020-1-26-319-328.

Full text

Abstract:

Nowadays we can clearly see the activeness of the methodological and technological aspects of the new geoinformation direction in the field of cartography. The development of modern mapping methods is closely related to the development of geoinformation systems and technologies. The importance of geoinformation cartography and geoinformation systems is significant in creating databases and digital maps based on GIS software instead of analog methods for creating maps. There are the most important tasks such as improvement of modern method in obtaining cartographic information, and development of ways to quickly transmit and distribute cartographic information about nature and society. The application of GIS technologies in the field of demographic cartography will lead to drastic changes in the scope of work, as well as improve product design and increase the accuracy as a result of the performed tasks. The study shows that there is a need to develop a new method for mapping a new generation based on GIS technology, reflecting demographic processes. This article will focus on creating a database for development of maps based on GIS technologies, rapid identification, monitoring spatial changes using data from aerospace and other sources, and development of demographic digital mapping methods based on GIS technologies. Mapping demographic processes based on GIS technologies aims at implementing a number of practical tasks and research related to population. Based on this, a systematic method has been developed to analyse the demographic situation in the southern region of the Republic of Uzbekistan, and a digital demographic map has been created by applying the developed method.

APA, Harvard, Vancouver, ISO, and other styles

32

Gan, Xiang Gen, Shui Ping Zhong, Sheng Wei, and Dong Bao Yang. "Characteristic Analysis on Suppressing VFTO in GIS by Ferrite." Advanced Materials Research 834-836 (October 2013): 385–89. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.385.

Full text

Abstract:

When disconnecting switches were operated,Very Fast Transient Overvoltage (VFTO) did great harm to power systems and their equipments in Gas Insulated Substations (GIS). Although VFTO can be suppressed by a few of known methods, there were some problems. Low voltage simulation tests show that putting ferrite rings around a disconnecting generatrix can damp traveling wave propagation and suppress VFTO in GIS. This method is economic and practical. We had analyzed ferrite characteristics of suppressing VFTO and got hold of ways of calculating ferrite size in GIS. Investigation shows that ferrite characteristics and sizes have a great effect on suppressing VFTO.

APA, Harvard, Vancouver, ISO, and other styles

33

Wu, Yi Zhou, and Ling Lin Wu. "The Application of GIS-SCENARIO Decision Method in Spatial Planning." Advanced Materials Research 368-373 (October 2011): 1798–801. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1798.

Full text

Abstract:

This study puts forward the framework of GIS—Scenario decision method and introduces some methods, ideas, principles and analysis process applied in regional spatial planning. Combining the GIS spatial analysis method with the scenario—planning, simulating and contrasting scenarios for regional key development zones, this study determines regional development strategies. Findings show that the GIS-SCENARIO analysis method can quantitatively analyze factors influencing the spatial distribution more accurately. Considering fully complex real situation and combined with reasonable value judgments, the GIS can provide various factors with a spatial analysis platform to contact and contrast with each other. As a strategic planning approach, it enables decision makers decide relatively reasonably in an uncertain and unpredictable situation and improves rationality in planning.

APA, Harvard, Vancouver, ISO, and other styles

34

He, Handong, Yanrong Liu, Jing Cui, and Di Hu. "Scenario Expression Method for Regional Geological Structures." ISPRS International Journal of Geo-Information 11, no. 1 (January 10, 2022): 47. http://dx.doi.org/10.3390/ijgi11010047.

Full text

Abstract:

Knowing the GIS expression of geological phenomena is an important basis for the combination of geology and GIS. Regional geological structures include folds, faults, strata, rocks, and other typical geological phenomena and are the focus of geological GIS research. However, existing research on the GIS expression of regional geological structure focuses on the expression of the spatial and attribute characteristics of geological structures, and our knowledge of the expression of the semantic, relationship, and evolution processes of geological structures is not comprehensive. In this paper, a regional geological structure scene expression model with the semantic terms positional accuracy, geometric shape, relationship type, attribute type, and time-type attributes and operations is proposed. A regional geological structure scenario markup language (RGSSML) and a method for mapping it with graphics are designed to store and graphically express regional geological structure information. According to the geological time scale, a temporal reference coordinate system is defined to dynamically express the evolution of regional geological structures. Based on the dynamic division of the time dimension of regional geological structures, the expression method of “time dimension + space structure” for the regional geological structure evolution process is designed based on the temporal model. Finally, the feasibility and effectiveness of the regional geological structure scene expression method proposed in this paper is verified using the Ningzhen Mountain (Nanjing section) as an example. The research results show that the regional geological structure scene expression method designed in this paper has the following characteristics: (1) It can comprehensively express the spatial characteristics, attribute characteristics, semantics, relationships, and evolution processes of regional geological structures; (2) it can be used to realize formalized expression and unified storage of regional geological information; and (3) it can be used to realize dynamic expression of the regional geological structure evolution process. Moreover, it has significant advantages for the expression of regional geological structure semantics, relationships, and evolution processes. This study improves our knowledge of the GIS expression of regional geological structures and is expected to further promote the combination and development of geology and GIS.

APA, Harvard, Vancouver, ISO, and other styles

35

Miao, Pei Qing, Xin Jian Tang, Feng Qing Du, Xing Lie Lei, and Xiu Chen Jiang. "Modeling Method of Interaction System for Intelligent GIS Based on IEC61850." Advanced Materials Research 718-720 (July 2013): 2163–70. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.2163.

Full text

Abstract:

GIS is now widely applied in power systems. It might lead to severe consequence when accidents take place, so online monitoring on GIS systems is necessary. Based on function analysis of the needs of GIS intelligent condition monitoring, a modeling method, a communication system and data exchanging interfaces, meeting IEC 61850 intrinsic ideas, are presented. Sharing and interacting strategies for intelligently-monitored GIS condition information are discussed. Focusing on MMS-based server/client communication mode, some information exchanging principles based on MMS messaging, logs and files are clarified. Server-client information exchanging communication programs are designed, and the flow charts of essential functions and client/server are also presented.

APA, Harvard, Vancouver, ISO, and other styles

36

Chen, Qingxiang, Jing Chen, and Wumeng Huang. "Method for Generation of Indoor GIS Models Based on BIM Models to Support Adjacent Analysis of Indoor Spaces." ISPRS International Journal of Geo-Information 9, no. 9 (August 24, 2020): 508. http://dx.doi.org/10.3390/ijgi9090508.

Full text

Abstract:

Methods for the generation of indoor geographic information system (GIS) models based on building information modelling (BIM) models can promote the analysis and application of indoor GIS, avoiding the complexity of traditional indoor space collection. The indoor adjacency relations (i.e., the attribute of IndoorGML) play a vital role in the adjacent query and analysis in indoor GIS applications (i.e., obtaining the neighbors or affected spaces of a cellular space in a building). However, current methods ignore the important feature, which considerably limits the spatial analysis ability of indoor GIS. Therefore, we developed a method for the generation of indoor GIS models based on BIM models to support adjacent analysis of indoor spaces. The method first devised an indoor GIS model (IGSM) by integrating spatial features (mainly adjacency relations) and the BIM model. Then, we proposed rapid modeling algorithms to mainly establish indoor adjacency relations based on the IGSM. Moreover, in the potential application of indoor GIS (e.g., indoor emergency response), we proposed a K-adjacent analysis algorithm to improve the application ability of the adjacent analysis of indoor GIS. Finally, experimental results suggest its validity and efficiency, which has substantial practical significance for the subsequent analysis and application of 3D GIS.

APA, Harvard, Vancouver, ISO, and other styles

37

OKUIZUMI, Soichiro, Makoto NAKATSUGAWA, and Tomohide USUTANI. "Proposal of Universal Method for Runoff Calculation Using GIS." JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 29, no. 1 (2016): 32–43. http://dx.doi.org/10.3178/jjshwr.29.32.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Panmala, Nattapon, Thanapong Suwanasri, and Cattareeya Suwanasri. "Condition Assessment of Gas Insulated Switchgear Using Health Index and Conditional Factor Method." Energies 15, no. 24 (December 12, 2022): 9393. http://dx.doi.org/10.3390/en15249393.

Full text

Abstract:

This paper proposes a comprehensive procedure to assess the condition of gas insulated switchgear (GIS) equipment by using the conventional weight and score method and introducing a conditional factor to improve the accuracy of the health index evaluation. Generally, the inspection and testing of GIS components are conducted according to manufacturer recommendations and guidelines in the international standards. However, this raw data has not been simplified and systematically processed for condition assessment. The score and weight technique are applied to transform the physical condition according to visible and measurable aging to numerical values in terms of component and bay health index values. The accuracy of the obtained health index has been improved by a conditional factor, which considers invisible aging factors, such as age, number of switching operations, degree of satisfactory operation, obsolescence, and adequacy of the interrupting rating. Here, a condition evaluation procedure has been developed and compared with the fuzzy logic method and the health index dominant score technique with satisfactory results. Subsequently, the proposed procedure has been developed as web application software to evaluate 175 bays of GIS in both 115 and 230 kV networks of an independent power producer supplying electricity of 3094 MW to a large industrial estate in Thailand. Eight GIS bays showed moderate or poor condition and the proper actions were assigned to prevent their failure. The software is in use in practice as a decision support tool to effectively manage the maintenance tasks and to improve supply reliability.

APA, Harvard, Vancouver, ISO, and other styles

39

Miller, Roger P. "Beyond Method, Beyond Ethics: Integrating Social Theory into GIS and GIS into Social Theory." Cartography and Geographic Information Systems 22, no. 1 (January 1995): 98–103. http://dx.doi.org/10.1559/152304095782540582.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Lee, Geun Sang, and Gi Sung Cho. "Improvement of evaluation method of soil loss in connection with GIS-based cadastral map." Journal of the Korean Cadastre Information Association 21, no. 3 (December 31, 2019): 29–41. http://dx.doi.org/10.46416/jkcia.2019.12.21.3.29.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Quan, Yu Sheng, Zong Cheng Zhang, Guang Chen, and Dai Juan Wang. "Research on Diagnosis Method of GIS Insulation Defects Based on Polynomial Fitting." Advanced Materials Research 805-806 (September 2013): 888–91. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.888.

Full text

Abstract:

GIS is currently widely used in the power system and is the Developing Trends of Electrical appliances manufacturing. At present, a lot of research on GIS PD, but the study of the recognition of the PD severity is less. By analyzing a large number of partial discharge sample data, a new GIS PD severity diagnostic method is proposed in this paper. Partial discharge is divided into three stages (initial stage, development stage and dangerous stage) in the method according to the severity of the partial discharge. These three stages are fitted with non-linear mapping and get the fitting parameters. GIS partial discharge fault reference database can be dynamically generated with these fitting parameters. The similarity between the detected data and the reference data is discriminated with the least square method and Supplier division method, and then the GIS PD severity can be diagnosed. A large number of simulation results initially confirmed the effectiveness and feasibility of the proposed method.

APA, Harvard, Vancouver, ISO, and other styles

42

Quan, Yu Sheng, Zi Sen Ning, Guang Chen, and Bo Yi. "Study on Identification Method of GIS Insulation Defects Based on ARMA." Advanced Materials Research 805-806 (September 2013): 843–46. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.843.

Full text

Abstract:

GIS is an important part in power system. The operating status of GIS is closely related to the operation of stability and security for grid. For existing problems in GIS insulation defects of mainstream identification method, a new identification method of GIS insulation defects based on ARMA is put forward in this paper. The paper proposes a method of multi-cycle time-domain average data preprocessing, a construction method of identifying reference data, a diagnosis method of regarding the coefficient of a certain order ARMA model as comparative quantity. At the same time, the author of the paper conduct a test on new identification method using laboratory devices, and confirms data validation of new identification method. The result suggests that the new identification method is effective and reliable.

APA, Harvard, Vancouver, ISO, and other styles

43

Okabe, Shigemitsu, and Sadayuki Yuasa. "Evaluation Method of Non-Standard Lightning Impulse Waveforms for GIS." IEEJ Transactions on Power and Energy 124, no. 1 (2004): 156–61. http://dx.doi.org/10.1541/ieejpes.124.156.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Wang, Hai Lun, and Jian Wei Shen. "Quantitative Analysis for SF6 and its Compositions in GIS." Advanced Materials Research 562-564 (August 2012): 1336–39. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1336.

Full text

Abstract:

In this paper, a method for GIS equipment fault diagnosis by the analysis of volume fractions of the derivatives of SF6 gas inside GIS equipment is presented. For the method, based on the differential spectra method, a neural network model and the particle swarm optimization are used for training analysis of infrared spectra, to realize the quantitative analysis of specific derivatives. The experimental results show that the prediction errors obtained by particle swarm optimization training are markedly superior to prediction errors obtained using the traditional method.

APA, Harvard, Vancouver, ISO, and other styles

45

Du, Fei, Wenzhi Chang, Jiangang Bi, Shuai Yuan, Xinghui Zhang, and Yanpeng Gong. "Evolution mechanism of ultraviolet and electrical phenomena induced by protrusion discharge in GIS." Journal of Electrical Engineering 71, no. 4 (August 1, 2020): 268–73. http://dx.doi.org/10.2478/jee-2020-0036.

Full text

Abstract:

AbstractTo improve the sensitive and reliability of condition monitoring in gas insulated switchgear (GIS), discharge perception system applied to GIS insulators protrusion discharge based on single ultraviolet photon is built. Step method is used to inspire the discharges of different severity, based on which, the regression relationship of ultraviolet (UV) signal and electrical signal are studied, and the perception mechanism of UV signal in different severity of discharges is analyzed. The study indicates that, the development of protrusion discharge in GIS can be divided into four stages, and there is no positive correlation between the number of ultraviolet photons caused by discharge radiation and insulation deterioration level, but related to the diffusion, migration and recombination of charged particles, then UV optical method for quantitative monitoring of discharge in each stage is provided, which provide a new method for quantitative measurement of GIS insulator discharge.

APA, Harvard, Vancouver, ISO, and other styles

46

Si, Wen-Rong, Chen-Zhao Fu, Zheng-Yong Hu, Bo Wang, and Jian Yang. "Numerical Study on Electromagnetic Coupled Heat Transfer and Ultrasonic Propagation in GIS Busbar Chamber." Mathematical Problems in Engineering 2022 (March 10, 2022): 1–14. http://dx.doi.org/10.1155/2022/7836212.

Full text

Abstract:

In the present paper, the electromagnetic coupled heat transfer and ultrasonic propagation in a 252 kV three-phase GIS busbar chamber were numerically studied by using the finite element method. The electromagnetic loss and distributions of SF6 gas velocity, temperature, and breakdown margin in the GIS busbar chamber were carefully analyzed, and the influences of SF6 gas velocity and temperature variations on ultrasonic propagation performances in the GIS chamber were discussed in detail. It is found that the SF6 gas breakdown margin in the GIS busbar chamber is mainly affected by the electric field intensity. When I = 3300 A and U = 1050 kV, the minimum SF6 gas breakdown margin in the GIS busbar chamber is 7.98 kV/mm, which is located at top of busbar conductor A, where the thermal breakdown risk is relatively high. Furthermore, it is noted that, when natural convection in GIS busbar chamber is weak, the influences of SF6 gas velocity and temperature variations on sound propagation would be insignificant. For this case, when acoustic propagation simulation is performed, the SF6 gas would be assumed to be stationary and its temperature would be set to the average gas temperature of natural convection in the GIS chamber, which would be beneficial to reduce the computational time and maintain the simulation accuracy as well.

APA, Harvard, Vancouver, ISO, and other styles

47

Jang, Bong-Joo, Sanghun Lim, Suk-Hwan Lee, Kwang-Seok Moon, V. Chandrasekar, and Ki-Ryong Kwon. "A Visualization Method of High Definition Weather Radar Information for various GIS Platforms." Journal of Korea Multimedia Society 16, no. 11 (November 30, 2013): 1239–49. http://dx.doi.org/10.9717/kmms.2013.16.11.1239.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Safavian, Seiied Taghi Seiied, Ebrahim Fataei, Taghi Ebadi, and Ali Mohamadian. "Site Selection of Sarein's Municipal Solid Waste Landfill Using the GIS Technique and SAW Method." International Journal of Environmental Science and Development 6, no. 12 (2015): 934–37. http://dx.doi.org/10.7763/ijesd.2015.v6.725.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Qu, Bin, Yongning Wang, Liangsheng Zhou, Kun Wang, Ziyue Wang, Jian Wang, and Haowei Chen. "GIS vibration test method and characteristic signal recognition." Journal of Physics: Conference Series 1865, no. 3 (April 1, 2021): 032021. http://dx.doi.org/10.1088/1742-6596/1865/3/032021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Valgma, I. "ESTONIAN OIL SHALE RESOURCES CALCULATED BY GIS METHOD." Oil Shale 20, no. 3S (2003): 404. http://dx.doi.org/10.3176/oil.2003.3s.15.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'GIS method'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles