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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of The Korean Institute of Electrical Engineers
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The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 62, Issue 12 - Dec 2013
Volume 62, Issue 11 - Nov 2013
Volume 62, Issue 10 - Oct 2013
Volume 62, Issue 9 - Sep 2013
Volume 62, Issue 8 - Aug 2013
Volume 62, Issue 7 - Jul 2013
Volume 62, Issue 6 - Jun 2013
Volume 62, Issue 5 - May 2013
Volume 62, Issue 4 - Apr 2013
Volume 62, Issue 3 - Mar 2013
Volume 62, Issue 2 - Feb 2013
Volume 62, Issue 1 - Jan 2013
Selecting the target year
An Evaluation of Reclosing Schemes in Korean Transmission Systems Considering Transient Stability
Oh, Yun-Sik ; Gwon, Gi-Hyeon ; Park, Ji-Kyung ; Jo, Kyu-Jung ; Sohn, Seung-Hyun ; Kim, Chul-Hwan ; Kim, Wan-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 731~736
DOI : 10.5370/KIEE.2013.62.6.731
Most of faults occurring in transmission lines are transient faults. For such faults, automatic reclosing is economic and effective method to improve the reliability and transient stability of power system. Many countries apply various reclosing schemes considering issues of their own systems such as transient stability, rate of success. Currently, different reclosing schemes are applied in Korean transmission systems according to a rated voltage. In this paper, we conduct an evaluation of reclosing schemes in Korean transmission systems considering transient stability. Computer simulations are performed by using ElectroMagnetic Transient Program (EMTP) and transmission system is modeled based on actual data of Korea.
Lightning Surge Analysis on Underground System in DC Combined Distribution System
An, Chun-Yong ; Lee, Jong-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 737~743
DOI : 10.5370/KIEE.2013.62.6.737
This paper describes the overvoltage through lightning surge analysis on underground system in DC combined distribution systems. It is considered that operating micro grid including distributed generation with smart grid can make possibility of composing new distribution system different from existing one. However, there are many papers about low voltage DC distribution in grids or buildings but not many about replacement or distributing 22.9kV AC distribution system to DC system. Among many research need for DC system development, overvoltage is studied in this paper. Overvoltage is simulated on DC cable when lightning strikes to overhead grounding wire which is installed at the nearest location from power cable section. Analysis as well as modeling is performed in EMTP/ATPDraw. It is evaluated that analysis results can be used to design of DC underground distribution power cable system.
A Study on the Protection Switching Mechanism for Distribution Automation System Ethernet Networks Service of Distribution Automation System
Yu, Nam-Cheol ; Kim, Jae-Dong ; Oh, Chae-Gon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 744~749
DOI : 10.5370/KIEE.2013.62.6.744
The protection switching technology is widely adopted in the fiber-optical transmission equipments based on TDM(Time Division Multiplexing), such as PDH, SDH/SONET. A variety of protection switching algorithms for Ethernet networks and the progress of standardization are summarized in the document. There are several kinds of protection switching algorithms for Ethernet networks, such as STP, RSTP, MSTP and etc. However, since Ethernet signal move through detour route, it causes much time to recover. Accordingly, it is difficult to secure a usability of Ethernet networks and QOS(Quality of Service). Also, if the protection switching protocol standardized by IEEE and ITU-T is used, it remains a inherent network switching time for protection. Therefore, a specific protection switching algorithm for Ethernet are needed for seamless and stable operation of Ethernet networks service for Distribution Automation System(DAS). A reliable protection algorithm with no switching delay time is very important to implement Self-healing service for DAS. This study of FPGA based protection switching algorithm for Ethernet networks shows that in case of faults occurrence on distribution power network, immediate fault isolation and restoration are conducted through interaction with distribution equipments using P2P(Peer to Peer) communication for protection coordination. It is concluded that FPGA based protection switching algorithm for Ethernet networks available 0ms switching time is crucial technology to secure reliability of DAS.
Implementation of In-wheel Motor Driving System for Electric Vehicle
Yun, Si-Young ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 750~755
DOI : 10.5370/KIEE.2013.62.6.750
In-wheel motor system gets the driving force from direct-driven motor in the wheel of electric vehicle. It is known as good system for vehicles, from an efficiency, packaging, handling and safety. This paper describes motor and inverter technologies, system configuration and control algorithms for in-wheel type electric vehicle. It is necessary to control on an interrelation perspective because this system drives two motors at same time. In system design, IPMSM(Interior Permanent Magnet Synchronous Motor) including a wide operating range and high-speed rpm is used and flux weakening control is performed in constant power range. Under the torque command from the host controller, auto control box, inverter`s output torque is calculated with using torque estimation technique and applied to actual vehicle driving system. It is verified that the configuration and the algorithm are suitable for the in-wheel motor system.
Software-Based Resolver-to-Digital Converter by Synchronous Demodulation Method including Lag Compensator
Kim, Youn-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 756~761
DOI : 10.5370/KIEE.2013.62.6.756
This paper propose the new demodulation method that can detect resolver signal`s peak at the time of position estimation when the position information is required during current controller period. The proposed method is performed in a synchronous demodulation way with exciting signal and also cover a capability which can compensate the lag element of exciting signal caused by the resolver`s inductive component and filter circuit. This paper carried out the experiment to investigate the validity and performance of the suggested method by using the test board made up of DSP and demodulation circuit. The test results show that the proposed method is theoretically clear and work completely as expected from making sure of sampling resolver signal`s peak at the time of position estimation. In addition, Software position tracking algorithm is executed with the demodulated signals generated by the suggested method and an exact position can be estimated.
Characteristics of Wireless Power Transmission applying the superconducting coil
Jeong, In-Sung ; Choi, Hyo-Sang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 762~766
DOI : 10.5370/KIEE.2013.62.6.762
Interest in Wireless Power Transmission (WPT) technology has been increasing worldwide recently. This trend is proved by commercialized products such as electric toothbrush, wireless razor, and wireless charger for mobile phone battery. Studies for enhancing the applicability of the technology have been continuously conducted. Currently the WPT technology is based on the technologies using microwave, inductively coupling, and magnetic resonance. In the meantime, development of the microwave-based WPT faces difficulty due to health hazards involved in the technology, and application of the WPT technology using inductively coupling is restricted by area due to the problem of transmission length. In comparison, the WPT technology using magnetic resonance draws attention in terms of efficiency and transmission length. In this study, the sending coil based on the WPT technology using magnetic resonance system was replaced with an HTS coil to enhance transmission efficiency. Since the HTS coil has a zero resistance, power transmission loss can be minimized. At the same time, size of the current density could be increased to 100 times or more than typical coils. In addition, through impedance matching of LC device, maximal resonance properties were induced and consequently, frequency selection quality characteristics or Q was enhanced. As a result, the WPT type using the HTS coil showed a longer transmission length and better transmission efficiency compared with the WPT type using typical coils.
A Fuzzy-PI Control Scheme of the Three-Phase Z-Source PWM Rectifier without AC-Side Voltage and Current Sensors
Han, Keun-Woo ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 767~781
DOI : 10.5370/KIEE.2013.62.6.767
In this paper, we proposes the AC input voltage and current sensorless control scheme to control the input power factor and DC output voltage of the three-phase Z-source PWM rectifier. For DC-link voltage control which is sensitive to the system parameters of the PWM rectifier, fuzzy-PI controller is used. Because the AC input voltage and current are estimated using only the DC-link voltage and current, AC input voltage and current sensors are not required. In addition, the unity input power factor and DC output voltage can be controlled. The phase-angle of the detected AC input voltage and estimated voltage, the response characteristics of the DC output voltage according to the DC voltage references, the FFT results of the estimated voltage and current, efficiency, and the response characteristics of the conventional PI controller and fuzzy-PI controller are verified by PSIM simulation.
Carbon Nanotube Synthesis with High Purity by Introducing of NH
Lee, Sunwoo ; Lee, Boong-Joo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 782~785
DOI : 10.5370/KIEE.2013.62.6.782
Multi-walled carbon nanotubes were synthesized on Ni catalyst using thermal chemical vapor deposition. By introducing ammonia gas during the CNT synthesis process, clean and vertically aligned CNTs without impurities could be prepared. As the ammonia gas increased a partial pressure of hydrogen in the mixed gas during the CNT synthesis process, we could control the CNT synthesis rate appropriately. As the ammonia gas has an etching ability, amorphous carbon species covering the catalyst particles were effectively removed. Therefore catalyst particles could maintain their catalytic state actively during the synthesis process. Finally, we could obtain clean and vertically aligned CNTs by introducing
gas during the CNT synthesis process.
Generation of a High Voltage Pulse of 50 ns Pulse Duration using a Helical Blumlein Pulse Forming Line
Roh, Youngsu ; Jin, Yun-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 786~791
DOI : 10.5370/KIEE.2013.62.6.786
A high voltage pulse generator based on the Blumlein pulse forming line (PFL) was fabricated to produce a voltage pulse whose peak value is ~300 kV and pulse duration is ~50 ns. Three cylindrical electrodes, such as inner, middle, and outer electrodes, are concentrically placed to make a compact PFL. To increase the pulse duration of the output pulse without any change of the size of the generator, the middle electrode is replaced by a helical strip electrode. To determine the radius of the helical electrode, the impedance of the helical Blumlein PFL is calculated using an approximate formula where the dispersive property of the helical Blumlein PFL is not considered. The dependence of the impedance on the frequency is computed by a commercial program. The number of turns in the helical electrode is decided to provide a demanded pulse duration. The experimental result shows that the helical Blumlein PFL is capable of making a high voltage pulse of ~50 ns pulse duration.
Matching-type Power Dividing Switch for Low Reflection in Indoor Microwave Power Distribution
Choi, Young-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 792~797
DOI : 10.5370/KIEE.2013.62.6.792
In a indoor microwave power distribution system, matching-type power dividing switch is proposed and designed with a various power dividing ratio. A matching coaxial cable probe is used behind the output probe for the reflecting power absorption. Reflecting characteristics of the matching coaxial cable probe are calculated by analyzing the S-parameter of this structure. Newly proposed matching-type switch shows a very low return loss less than -30dB at the operating frequency of 2.45GHz with a dividing power ratio of 50.2%. The simulated results by use of 3-stage power divider shows a good agreement with the theoretical estimation for the various combination of the different switching ratio.
Minimization of a CW CO2 Laser Output Ripple by using High Frequency Resonance Phenomena
Sikander, Sakura ; Kwon, Min-Jae ; Kim, Hee-Je ; Lee, Dong-Gil ; Xu, Guo-Cheng ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 798~802
DOI : 10.5370/KIEE.2013.62.6.798
In a conventional DC power supply used for CO2 laser, the circuit elements such as a rectifier bridge, a current-limiting resistor, a high voltage switch, energy storage capacitors ans a high-voltage isolation transformer using high turn ratio are necessary. Consequently, those supplies are expensive and require a large space. Thus, laser resonator and power supply should be optimally designed. In this paper, we propose a new power supply using high frequency resonance phenomena for CW(Continuous wave) CO2 laser (maximum output of 23W with discharge length of 450mm). It consists of a transformer including leakage inductance, magnetizing inductance and half-bridge converter, a three-stage Cockcroft-Walton and PFC(Power factor correction) circuit. The output ripple voltage can be controlled the minimum of 0.24% under the high frequency switching of 231kHz. Furthermore, the output efficiency was improved to 16.4% and the laser output stability of about 5.6% was obtained in this laser system.
An Analysis on the Effect of the Shape Features of the Textile Electrode on the Non-contact Type of Sensing of Cardiac Activity Based on the Magnetic-induced Conductivity Priciple
Gi, Sun Ok ; Lee, Young Jae ; Koo, Hye Ran ; Khang, Seon Ah ; Park, Hee Jung ; Kim, Kyeong Seop ; Lee, Joo Hyeon ; Lee, Jeong Whan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 803~810
DOI : 10.5370/KIEE.2013.62.6.803
The purpose of this research is to analyze the effect of shape of the inductive textile electrode on the non-contact heart activity sensing, based on the magnetic-induced conductivity principle. Four types of the inductive textile electrodes were determined according to the combinations of the two shape features. A fiber-metal hybrid-typed conductive thread was developed and applied to materialization of the textile electrodes by embroidery method. The heart activity was extracted through the textile electrode sewn on a T-shirt. The experiments were implemented to constantly measure the heart activity for 20 seconds, in each case of 5 healthy male subjects. The heart activity signals acquired in each type of the inductive textile electrode were analyzed, 1)by drawing a comparison of morphology with those of ECG signal (LeadII), and 2)by calculation of the normalized mean and standard deviation of magnitude of the heart activity signals. The analysis resulted that the relatively better quality of signals were acquired in the `square` types in the matter of whole shape, while the better results were obtained in `donut` types in the matter of center hole. Accordingly, the relatively best quality of signals was obtained in the case of `Square-Donut` type of the inductive textile electrode.
Development of WMTS Module Based Pulse Rate Period Detection and Human Sensibility Evaluation System
Lee, Hyun-Min ; Kim, Dong-Jun ; Jeon, Ki-Man ; Son, Jae-Gi ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 811~817
DOI : 10.5370/KIEE.2013.62.6.811
In this study we present a system for pulse-rate period detection and human sensibility evaluation based on the wireless medical telemetry service (WMTS) used for transmission of data from medical telemetry devices to various medical facilities and services. We develop a medical-purpose specific WMTS communication module to transmit biometric signals. From the pulse rate variability(PRV) signal, we attempt to classify positive and negative emotional states based on analysis of the ratio of LF/HF in the frequency domain. We measure the data reception rate according to distance in order to test the performance of the WMTS module and analyze the effects on human sensibility evaluation.
Implementing Graphic User Interface System for Microwave Radiometry Data to Utilize Breast Cancer Diagnosis
Shin, Seung-Won ; Kim, Kyeong-Seop ; Lee, Jeong-Whan ; Han, Jong-Sam ; Heo, Kyou-Hak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 818~824
DOI : 10.5370/KIEE.2013.62.6.818
In this study, a novel Graphic User Interface (GUI) software development system is suggested so that it can be applied to diagnose breast cancer with utilizing 3~4.2 GHz microwave radiometric data. The estimated inner and surface temperature values on the patient`s right and left breast in terms of microwave radiometry are visualized in HSV color mapping space and their relevant contour regions and lines are depicted by Marching Square graphic algorithm. Also the database system is implemented in terms of patient and diagnostic module to support the medical decisions concerning the breast cancer diagnosis.
Suppressing Artefacts in the ECG by Independent Component Analysis
Kim, Jeong-Hwan ; Kim, Kyeong-Seop ; Kim, Hyun-Tae ; Lee, Jeong-Whan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 825~832
DOI : 10.5370/KIEE.2013.62.6.825
In this study, Independent Component Analysis (ICA) algorithms are suggested to extract the original ECG part from the mixed signal contaminated with the unwanted frequency components and especially 60Hz power line disturbances. With this aim, we implement a novel method to suppress the baseline-wandering disturbances and power line artefacts contained in patch-electrodes sensory ECG data by separating the unmixed signal with finding the optimal weight W based on Kurtosis value. With applying brutal force and gradient ascent searching algorithm to find W, we can conclude that the unwanted frequency components especially in the ambulatory ECG data can be eliminated by Independent Component Analysis.
Respiratory Air Flow Transducer Applicable to Cardiopulmonary Resuscitation Procedure
Kim, Kyung-Ah ; Lee, In-Kwang ; Lee, You-Mi ; Yu, Hee ; Kim, Young-Il ; Han, Sang-Hyun ; Cha, Eun-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 833~839
DOI : 10.5370/KIEE.2013.62.6.833
Cardiopulmonary resuscitation (CPR) is performed by thoracic compression and artificial ventilation for the patient under emergent situation to maintain at least the minimum level of respiration and blood circulation for life survival. Good quality CPR requires monitoring respiration, however, traditional respiratory air flow transducers cannot be used because the transducer elements are facing the whole area perpendicular to the flow axis. The present study developed a new air flow transducer conveniently applicable to CPR. Specially designed "sensing rod" samples the air velocity at 3 different locations of the flow cross-section, then transforms into average dynamic pressure by the Bernoulli`s law. The symmetric structure of the sensing holes of the sensing rod enables bi-directional measurement simply by taking the difference in pressure by a commercial differential pressure transducer. Both inspiratory and expiratory flows were obtained with symmetric measurement characteristics. Quadratic curve fitting provided excellent calibration formula with a correlation coefficient>0.999 (P<0.0001) and the mean relative error<1%. The present results can be usefully applied to accurately monitor the air flow rate during CPR.
A Study on Estimate Vascular Compliance using Acceleration Photoplethymogram
Lee, Chung-Luyl ; Kim, Kyung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 840~844
DOI : 10.5370/KIEE.2013.62.6.840
In this study, we try to estimate vascular compliance for management vascular disease. Because It is known the vascular compliance represents the state of the blood vessels. In general, the vascular compliance is estimated using an acceleration photoplethymogram from measured by photoplethymogram-based. The acceleration photoplethymogram is come from second derivative of photoplethymogram. By using the acceleration photoplethymogram, we can estimating vascular compliance, vascular age, vascular state. In this study, for measuring acceleration photoplethymogram we have developed a measurement device having analog filters. It has the advantage of miniaturization, low-power because it is simpler than digital filters. Using the developed device, we have estimated vascular compliance and tested the reliability of our device compare with conventional device having digital filters. As a result.
Application of IMCS MBC Logic for Thermal Power Plant
Shin, Man-Su ; Yoo, Kwang-Myeng ; Byun, Seung-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 845~851
DOI : 10.5370/KIEE.2013.62.6.845
Because the existing control system has been operating for about 20 years, it is necessary to upgrade the system for stable and efficient operation. But, there is a difficulty in maintenance by difference of manufacturer of each main control systems for boiler, turbine and generator. This developed IMCS(Integrated Monitoring and Control System) consists of more than 10,000 inputs and outputs for large scale thermal power plant. This paper consists of the development journey of IMCS MBC(mill and burner control) ; core binary protection & monitoring logic including prevention circuit of boiler explosion & implosion. In this project, the IMCS for boiler, turbine and generator was developed on basis of one communications platform. In this paper, the whole journey of development of IMCS MBC is dealt with designing software and hardware, coding application software, and validating software and hardware.
Target Tracking Control of Mobile Robots with Vision System in the Absence of Velocity Sensors
Cho, Namsub ; Kwon, Ji-Wook ; Chwa, Dongkyoung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 852~862
DOI : 10.5370/KIEE.2013.62.6.852
This paper proposes a target tracking control method for wheeled mobile robots with nonholonomic constraints by using a backstepping-like feedback linearization. For the target tracking, we apply a vision system to mobile robots to obtain the relative posture information between the mobile robot and the target. The robots do not use the sensors to obtain the velocity information in this paper and therefore assumed the unknown velocities of both mobile robot and target. Instead, the proposed method uses only the maximum velocity information of the mobile robot and target. First, the pseudo command for the forward linear velocity and the heading direction angle are designed based on the kinematics by using the obtained image information. Then, the actual control inputs are designed to make the actual forward linear velocity and the heading direction angle follow the pseudo commands. Through simulations and experiments for the mobile robot we have confirmed that the proposed control method is able to track target even when the velocity sensors are not used at all.
A Comparative Analysis of Displacement Measurement of the Earth Surface by Load for Root Anchor Block and Rectangle Anchor Block
Mun, Sung-Won ; Kim, Jeom-Sik ; Kim, Do-Young ; Park, Yong-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 863~869
DOI : 10.5370/KIEE.2013.62.6.863
In this paper, we compared and analyzed for safety 1.2m rectangular anchor block and arch-type root anchor block. First, numerical analysis was performed three-dimensional nonlinear method by numerical model test using finite element analysis program "Visual FEA". Then, measure displacement of the surface of the earth after construct each anchor block at 14M electric pole and increase loads through field verification tests for safety evaluation.
A Risk Evaluation Model of Power Distribution Line Using Bayesian Rule -Overhead Distribution System-
Joung, Jong-Man ; Park, Yong-Woo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 870~875
DOI : 10.5370/KIEE.2013.62.6.870
After introducing diagnosis equipment power failure prevention activities for distribution system have become more active. To do facility diagnosis and maintenance work more efficiently we need to evaluate reliability for the system and should determine the priority line with appropriate criteria. Thus, to calculate risk factor for the power distribution line that are composed of many component facilities its historical failure events for the last 5 years are collected and analysed. The failure statics show that more than 60% of various failures are related to environment factors randomly and about 20% of the failures are refer to the aging. As a strategic evaluation system reflecting these environmental influence is needed, a system on the basis of the probabilistic approach related statical variables in terms of failure rate and failure probability of electrical components is proposed. The figures for the evaluation are derived from the field failure DB. With adopting Bayesian rule we can calculate easily about conditional probability query. The proposed evaluation system is demonstrated with model system and the calculated indices representing the properties of the model line are discussed.
Development of Arc Fault Circuit Interrupter Using the Distorted Voltage Wave in Electric Arc Faults
Kwak, Dong-Kurl ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 876~880
DOI : 10.5370/KIEE.2013.62.6.876
The major causes of electrical fire are classified to short circuit fault, overload fault, electric leakage and electric contact failure. The principal factor of the fire is electric arc or spark accompanied with such electric faults. Earth Leakage Circuit Breaker (ELB) and Molded_case Circuit Breaker (MCCB), that is, Residual Current Protective Devices (RCDs) used on low voltage distribution lines cut off earth leakage and overload, but the RCD can not cut off electric arc or spark to be a major factor of electrical fire. As the RCDs which are applied in low voltage distribution panel are prescribed to rated breaking time about 30[ms] (KS C 4613), the RCDs can`t perceive to the periodic electric arc or spark of more short wavelength level. To improve such problems, this paper studies on an arc fault circuit interrupter (AFCI) using the distorted voltage wave in electric arc faults. The proposed voltage sensing type AFCI is an electrical fire prevention apparatus of new conception that operates a circuit breaker with sensing the instantaneous voltage drop of line voltage at electrical faults occurrence. The proposed AFCI is composed of control circuit topology using some semiconductor switching devices. Some experimental tests of the proposed AFCI confirm practicality and the validity of the analytical results.
Implementation of Prediction Program for Deterioration Judgment on Substation Power Systems in Urban Railway
Jung, Ho-Sung ; Park, Young ; Kang, Hyun-Il ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 881~885
DOI : 10.5370/KIEE.2013.62.6.881
In this paper, we present a deterioration judgment model of urban rail power equipment using driving history, the frequency and number of failures. In addition, we have developed a deterioration judgment program based on the derived failure rate. A deterioration judgment model of power equipments on metro system was designed to establish how much environmental factors, such as thermal cycling, humidity, overvoltage and partial discharge. The deterioration rate of the transformers followed the Arrhenius log life versus reciprocal Kelvin temperature (hotspot temperature) relation. The deterioration judgment program is linked to the online condition monitoring system of urban railway system. The deterioration judgment program is based on the user interface it is possible to apply immediately to the urban rail power equipment.
Implementation of Optimization of the Uplift Amount Measurement System of Overhead Contact Line
Park, Young ; Lee, Kiwon ; Park, Chulmin ; Kwon, Sam-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 6, 2013, Pages 886~890
DOI : 10.5370/KIEE.2013.62.6.886
Uplift of contact wire and dynamic characteristics between pantograph and contact wire are key interaction performance of OCS (Overhead Catenary System). These two evaluation items are the approval criteria for the performance between OCS and pantograph. A telemetry system or DAQ (Data Acquisition) System based on wireless communication make it monitor a dynamic behavior which is measured directly in a 25 kv like parts. While permissible working time is too short time to install is too long. In this paper, it is described that optimization the telemetry measurement system for OCS and increasing accuracy, easy adaptation, and faster handling can be also achieved through the study.