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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 P
Journal Basic Information
Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 57, Issue 4 - Dec 2008
Volume 57, Issue 3 - Sep 2008
Volume 57, Issue 2 - Jun 2008
Volume 57, Issue 1 - Mar 2008
Selecting the target year
Development of Onboard Power Supply Device for Precision Guided Kit
Park, Deok-Bae ; Kim, Hyung-Shin ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 209~214
A precision guided kit is a GPS/INS guided range extension system to improve the accuracy and availability of existing dumb bombs. The PSD(power supply device) installed in the GPS guided kit supplies electrical power to all electrical loads in the kit. In this paper, design process and test results of the PSD have been presented. Additionally, the performance results of the PSD during actual ground and flight tests have been described.
Precision Position Controller of Linear Motor-Based Container Transfer System
Lee, Young-Jin ; Lee, Jin-Woo ; Cho, Hyun-Cheol ; Lee, Kwon-Soon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 215~224
In this paper, we introduced a linear motor-based transfer system with an active pid controller which can be replaced with an automated guided vehicle (AGV) for the port automation. This system, which is named LMCTS(liner motor-based container transfer system), is based on PMLSM (permanent magnetic linear synchronous motor) which basically consists of stator modules on the rail and shuttle car. Therefore more progressive and adaptive control mechanisms should be required to control a system with large variation of container weight, the difference of each characteristic of stator modules, a stator module's trouble etc. We introduced an active control mechanism with an online tuning scheme using modified evolutionary strategy. Some computer simulations are implemented to assess the robustness of the proposed system.
A Characteristic Study on the Power Factor Compensation Application of High Voltage Induction Motor
Kim, Jong-Gyeum ; Park, Young-Jeen ; Lee, Eun-Woong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 225~230
Reactor starting method has the advantage of simplicity and closed transition in spite of lower starting torque per kVA. This method allows a smooth start with almost no observable disturbance on transition and is suitable for applications such as centrifugal pumps or fans. Reactive power doesn't contribute to work but needs to sustain the electromagnetic field required for the induction motor to operate. Starting power factor of induction motor is specially lower than running power factor. Power factor application is needed to compensate for the lower power factor of induction motor. This power factor compensation systems is occasionally being hit by the effects of the starting reactor connection position at the starting, stopping of high-voltage induction motor. This paper describes voltage and current stress affected by the installation position of power factor compensation application at the reactor starting method.
A Power Circuit Improvement of the Hybrid System Using Phase Controlled Rectifier and PWM Converter for Magnet Load Power Supply
Kang, Min-Gu ; Shon, Jin-Geun ; Jeon, Hee-Jong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 231~235
Thyristor rectifiers are still the preferred choice for large magnet power supplies. However, large harmonic voltages, resulting in large current ripple, and slow dynamic response are major drawbacks of these converters. Joos presented a topology and a control technique for a hybrid large-power high-precision magnet power supply in 1996. The system consists of a phase controlled rectifier (PCR) connected in series with a high-frequency PWM converter. This paper improves the power circuit of the PWM converter using interphase transformer. Simulation result proves effect of the proposed system.
Magnetic Flux Saturation Analysis of Matching Transformer Considering Characteristic of Dynamic Voltage Restorer(DVR)
Shon, Jin-Geun ; Kim, Dong-Joon ; Kang, Min-Gu ; Jeon, Hee-Jong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 236~243
This paper analyses magnetic flux saturation of matching transformer considering characteristic of dynamic voltage restorer(DVR) system to solve voltage sags which are considered the dominant disturbances affecting power quality. This DVR consist of PWM inverter to inject arbitrary voltage, LC low pass filter and matching transformer for isolation and grid connection. However, the matching transformer has an excess of inrush current by magnetic flux saturation in the core of transformer. Due to this inrush current, the rating of matching transformers is double for needed nominal rating for protection of DVR. Therefore, in this paper, an advanced modeling method of magnetic flux saturation is used to analyze a magnitude and characteristic of magnetizing current. Simulation and experimental results considering characteristic of DVR system are provided to demonstrate the validity of the proposed analysis method.
Improvement of Low Speed Operation Characteristic of DC Servo Motor Using a Fuzzy Tuning Speed Observer
Ahn, Chang-Hwan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 244~249
This paper deals with speed control of DC servo motor using a Fuzzy tuning observer. Speed sensor detect a speed of rotor continuously. But it have a limit as a driving speed to detect speed precisely. So it is problem to improve the performance of the driving system. To solve the problem, it is studied to detect a speed of DC motor without sensor. In particular, study on the method to estimate the speed using the observer is performed a lot. In this parer, the gain of the observer is properly set up using the fuzzy observer. The fuzzy observer has a superior transient characteristic and is easy to implement compared the existing method is designed. It estimate the derivative of the armature current directly using the armature current measured in the DC motor. It estimate the speed of the rotor using the differentiation. It is proposed speed sensorless control method using the estimated speed. Optimal gain of Luenberger observer is set up using the fuzzy observer and adapted speed control of DC servo motor low speed operation. It is proved excellence and feasibility of the presented observer from the comparison tested a case with a speed sensor and a case without a speed sensor which used a highly efficient drive and 200W DC servo motor starting system.
Adaptive Control of Flexible Robot Actuators with Time-Varying Parameters
Park, Ji-Ho ; Cho, Hyun-Cheol ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 250~254
Robot actuators are significantly important with respect to whole control system performance. This paper presents an adaptive control approach for flexible robot actuators with time-varying spring and damping nature. We first represent a perturbed system model with assumption that its information are partially known. Nominal model reference control method is employed for deriving our adaptive control law. We carry out numerical simulation to evaluate the proposed control system and compare simulation results to a well-known control method for demonstrating its effectiveness.
Design of a Current-Mode Analog Filter for WCDMA Baseband Block
Kim, Byoung-Wook ; Bang, Jun-Ho ; Cho, Seong-Ik ; Choi, Seok-Woo ; Kim, Dong-Yong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 255~259
In this paper, a current-mode integrator for low-voltage, low-power analog integrated circuits is presented. Using the proposed current-mode integrator, the baseband analog filter is designed for WCDMA wireless communication. To verify the proposed current-mode integrator circuit, Hspice simulation using 1.8V TSMC
CMOS parameter is performed and achieved 44.9dB gain, 15.7MHz unity gain frequency. The described 3rd-order current-mode baseband analog filter is composed of the proposed current-mode integrator, and SFG(Signal Flow Graph) method is used to realize the baseband filter. The simulated results show 2.12MHz cutoff frequency which is suitable for WCDMA baseband block.
Design of a Dual Mode Baseband Filter Using the Current-Mode Integrator
Kim, Byoung-Wook ; Bang, Jun-Ho ; Cho, Seong-Ik ; Choi, Seok-Woo ; Kim, Dong-Yong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 260~264
In this paper, a dual mode baseband analog channel selection filter is described which is designed for the Bluetooth and WCDMA wireless communications. Using the presented current-mode integrator, a dual mode channel selection filter is designed. To verify the current-mode integrator circuit, Hspice simulation using 1.8V Hynix
standard CMOS technology was performed and achieved
unity gain frequency. The described third-order dual mode analog channel selection filter is composed of the current-mode integrator, and used SFG(Signal Flow Graph) method. The simulated results show 0.51, 2.40MHz cutoff frequency which is suitable for the Bluetooth and WCDMA baseband block each.
Fabrication and Evaluation of AC 400 kV High Voltage Divider using Electric Field Sensor
Lee, Sang-Hwa ; Han, Sang-Gil ; Jung, Jae-Kap ; Kang, Jeon-Hong ; Kim, Yoon-Hyoung ; Jeong, Jin-Hye ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 265~269
Output voltage value of AC high voltage source has usually been obtained by measuring the low arm voltage of high voltage divider or the secondary voltage of high voltage transformer. In this study, we have fabricated the AC 400 kV high voltage divider using high voltage electrode and electric field measurement sensor. The dividing ratio of the fabricated 400 kV high voltage divider was evaluated using reference 400 kV capacitive divider. The dividing ratio of 400 kV high voltage divider is found to be 12,322 and has the good linearity within 0.63 % against AC high voltage up to 400 kV. Therefore, the developed 400 kV high voltage divider could evaluate 400 kV high voltage supply and voltage divider used in industry.
Development of Simple Structure Microwave Sensor
Jung, Soon-Won ; Lee, Jae-Jin ; Koo, Kyung-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 270~274
The microwave sensor in which the sensitivity was excellent and a structure is simple was developed and it manufactured. And the sensing range that uses the developed product was confirmed. When the developed microwave sensor was set up in the ceiling of a building, we confirmed that the amplitude of the sensitive area increased as the tilting angle was enlarged. The sensitive area became a greatest in case the tilting angle was 65 degree. According to the height of a ceiling, because the sensing range is determined, in case of using in the building in which the height of a ceiling is enough secured it is determined to secure the more wide sensitive area. Moreover, the configuration of the circuit having the simple structure makes the miniaturization of a product, and the light weight possible. It is considered to have the price competitive power which it reduces the manufacturing cost, is sufficient.
Analysis of Electrical Safety Level Test for Barehand Work at 765kV Vertical Double Circuit Six Bundle Conductors on the Suspension String Tower Type
Kim, Dae-Sik ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 275~278
It has been issued that the necessity of Live line work for 765kV vertical double circuit six bundle conductors transmission line when the characteristics of transmission line, the composition of T/L and near the T/L circumstances etc. Others are considered. The Barehand method of UHV T/L is extremely dangerous work and especially it is directly related with lineman life so it is very dangerous. It should be performed several technology developments for live-line work on the UHV T/L, that should be considered such as the electrical influence on workers near the T/L, development of live-line facilities, guarantee of safety, the technical rules of live-line work, the safe method of live-line work and etc. In order to maintain the 765kV transmission lines safely by barehand work, first of all, we should know the analysis of electrical safety level test in live-line work at 765kV vertical double circuit six bundle conductors on the suspension string tower type.
Absolute Evaluation of Inductor Using Current Transformer Comparator
Kim, Yoon-Hyoung ; Jung, Jae-Kap ; Han, Sang-Gil ; Kim, Han-Jun ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 279~284
We have developed two absolute evaluation technology of inductor using current transformer (CT) comparator. One is the method that the reactance of inductor is obtained by analysing the equivalent circuit of CT with inductor connected to series at secondary terminal of CT. The other is the method that the reactance of inductor is obtained by comparing phase displacement of current flowing on inductor by using CT comparator. These technologies have the advantage to apply up to rated current and voltage of inductor. The method was applied to inductors under test in the range of
. The inductance of the inductor under test obtained in this study are consistent with those measured by LCR meter using the same inductor within an expanded uncertainty (k = 2) in the overall range of inductance.
Absolute Evaluation of Capacitor and Inductor Using Voltage Transformer Comparator
Han, Sang-Gil ; Kim, Yoon-Hyoung ; Jung, Jae-Kap ; Kim, Han-Jun ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 285~290
We have developed the absolute evaluation technique of capacitor and inductor by measuring the phase displacement as a function of resistance of employed resistors in voltage transformer(VT) comparator. The methods were applied to the capacitor with the range of 100 nF -
and the inductor with the range of
. The capacitance values of capacitor obtained using our method are consistent within the expanded uncertainty those obtained using capacitor bridge. The inductance values of inductor obtained using our method are also consistent within the expanded uncertainty those obtained using LCR meter.
Evaluation Technique for Ratio Error of Current Transformer Comparator
Kim, Yoon-Hyoung ; Han, Sang-Gil ; Jung, Jae-Kap ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 291~295
We have developed an evaluation technique for ratio errors of current transformer (CT) comparator by using the precise standard capacitors. By applying this technique for equivalent circuit of CT comparator evaluation system, we can obtain the calculated and measured ratio errors in the CT comparator. Thus we can evaluate ratio errors of CT comparator by comparing the calculated and measured ratio errors. Because this method requires only the standard capacitors, it is simple and easy method to reliability and accuracy maintenance of CT comparator. The method was applied to CT comparator under test with the ratio error ranges of
. The ratio error of the CT comparator under test theoretically obtained in this method are consistent with that measured for same CT comparator under test by using wide ratio error CT within an estimated expanded uncertainty (k = 2) in the overall ratio error ranges.
Study on the Ground Fault Protection in 6.6KV Ungrounded Power System SGR Malfunction or Non-Tripping
Kim, Byung-Tae ; Lee, Dal-Woo ; Jeon, Myung-Soo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 296~301
This paper presents a study on the ground fault protection in 6.6KV ungrounded power system relay(SGR) malfunction or non-tripping. Ground test had made on 6.6KV HV(high voltage) system, Some of domestic and oversea's SGR products are different from their own specific characteristics. This study on the ground protection relay 6.6KV power supply system is focused to protect human.
An Investigation on the Fault Currents in 22.9 kV Distribution System Due to the Increased Capacity and Operating Conditions of Power Transformers in 154 kV Substation
Cho, Seong-Soo ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 302~310
In order to evaluate the nominal rating of breakers in distribution system due to the increased capacity and operating conditions of power transformers in 154 kV substation, the fault currents in distribution system were calculated by the conventional method and simulations of PSCAD/EMTDC program. Consequently, under the condition of the parallel operation of transformers, the fault currents exceed the nominal current of the breakers in some areas. Without NGR at the secondary neutral of the transformer, the current of single line-to-ground fault was bigger than that of 3-phase fault. Therefore, the results clearly show that the measures to limit the fault currents in distribution system are needed when the increased capacity of power transformers is introduced into 154 kV substation.
Phenomena of Charge Transport and Electroluminescence in LDPE (Low Density Poly Ethylene)
Cho, Jae-Cheol ; Choi, Yong-Sung ; Moon, Sung-Chang ; Hwang, Jong-Sun ; Lee, Kyung-Sup ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 311~317
Polymers submitted to thermo/electrical stress suffer from ageing that can drastically affect their functional behaviour. Understanding the physico/chemical processes at play during ageing and defining transport regimes in which these mechanisms start to be critical is therefore a prime goal to prevent degradation and to develop new formulation or new materials with improved properties. It is thought that a way to define these critical regimes is to investigate under which conditions (in terms of stress parameters) light is generated in the material by electroluminescence (EL). This can happen through impact excitation/ionization involving hot carriers or upon bi-polar charge recombination (a definition that excludes light from partial discharges, which would sign an advanced stage in the degradation process). After a brief review of the EL phenomenology under DC, we introduce a numerical model of charge transport postulating a recombination controlled electroluminescence. The model output is critically evaluated with special emphasize on the comparison between simulated and experimental light emission. Finally, we comment some open questions and perspectives.
Field Application of Multi-Agent Transformer Condition Monitoring Using Multi-Sensors
Cho, Jae-Cheol ; Choi, Yong-Sung ; Moon, Sung-Chang ; Hwang, Jong-Sun ; Lee, Kyung-Sup ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 318~322
On-line condition monitoring is a useful tool for maintaining and extending the longevity of power transformers. An intelligent diagnostic system is desirable for operational safety and reliability. Bringing these concepts together results in a powerful support tool for engineers, reducing the volume of data to deal with, and making the data more meaningful. This paper describes how a multi-agent system for diagnosing the cause of transformer partial discharge activity was coupled with a method of UHF partial discharge monitoring, creating an on-line condition monitoring system. The challenges presented by the on-site environment are discussed, along with the implications for the complete system.
Improvement of Quench Properties of a Flux-Lock Type Superconducting Fault Current Limiter by the Connection Method of YBCO Elements
Chung, Soo-Bok ; Park, Hyoung-Min ; Choi, Hyo-Sang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 323~327
We investigated the quench characteristics of a flux-lock type superconducting fault current limiter (SFCL) depending on the methods of the serial and parallel connections between the superconducting elements. The flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil through an iron core, and the secondary coil is connected to the superconducting elements in series and parallel. In this paper, the analyses of voltage, current, and resistance of the superconducting elements connected in serial and parallel were performed to increase the power capacity of the flux-lock type SFCL. A part of the superconducting elements was not quenched in
serial connection between the elements and then the power burden of the quenched elements was increased. However the elements with
parallel connection was all quenched. This means that the power burden of each superconducting element can be reduced under the same conditions. We found that
parallel connection was more profitable for the current limiting effects and the increase of the power capacity.
A Experimental Study on the Fire Hazards in Drum-Type Electric Washing Machine
Hong, Sung-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 328~331
This study presents on the analysis fire hazards of drum type electric washing machine. In order to analyze fire hazards fire experiment is conducted. The fire experiment is conducted to simulate under the normal condition and abnormal condition. The experiment under the abnormal condition is simulated in safety device failure, situation of accumulated dust and tracking phenomenon caused by humidity. The results show that fire hazard is high at the abnormal condition. In this paper, we suggest to use the safety device of low operating temperature in electric washing machine for reducing fire hazard.
Variation of Carbonization Pattern and Crystal Structure of Polyvinyl Chloride Wire Under the Thermal Stresses
Choi, Chung-Seog ; Kim, Hyang-Kon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 332~337
We analyzed carbonization pattern and crystal structure of polyvinyl chloride wire by thermal stress. Copper that is oxidized at normal temperature is a reddish brown. If under the thermal stress range of 500 to 700 [
], carbonization and exfoliation occurrence. Section structure of electric wire is same as arrangement of particle in metallograph analysis. But, as thermal stress increases, size of particle is enlarged. Electric wire displays elongation structure in SEM image analysis and elongation structure collapses when receive thermal stress at 300 [
]. In EDX analysis, we get the spectra of CuL, CuK, OK, and ClK. FT-IR analysis was shown new spectra with in range of
, 1,340 [
], 1,240 [
A Study on the Temperature Characteristics of High Voltage Power Cable for Hybrid Electric Vehicle
Lee, Ki-Yeon ; Kim, Dong-Woo ; Kim, Dong-Ook ; Gil, Hyoung-Jun ; Kim, Hyang-Kon ; Choi, Chung-Seog ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 338~342
Hybrid Electric Vehicle(HEV) is driven by an internal-combustion engine and an electric motor. It is a combination of an internal-combustion engine and several electrical equipments which use a high voltage battery, an electric motors, an inverter and others. But there is not any separate detailed enforcement regulations for high voltage electric appliances in the existing vehicle-related safety standards. So, test standards suggestion as well as test technique development need to be done for ensuring electrical safety, for an electric motor, a high voltage battery, a(n) inverter/converter and an electric power transmission units and other equipments to ensure the safety of high voltage electric appliances which is the HEV key electrical component. In this paper, We are to provide helpful data to support test technique development and test standard establishment for HEV design and electrical safety security by the following methods; by measuring the voltage, the electric current, and the frequency of HEV, by analyzing electrical characteristics of high voltage electric appliances, and by analyzing temperature characteristics of the electrical current among the analyzed electrical characteristics by thermal imagining cameras.
Analysis on the Quench Characteristics According to Magnetic Field of the Matrix-Type SFCL with
Oh, Kum-Gom ; Cho, Yong-Sun ; Choi, Hyo-Sang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 3, 2008, Pages 343~348
We investigated the quench characteristics accordance with increase of turns and applied voltage of matrix-type superconducting fault current limiter (SFCL) with
matrixes. The matrix-type SFCL consists of the trigger part to apply magnetic field and the current-limiting part to limit fault current. The fault current limiting characteristics according to the increase of magnetic field and applied voltage were nearly same. This is because the application of magnetic field has not an affect on total impedance of SFCL. When number of turns of reactor increased, the voltage difference between two superconducting units in the current-limiting part according was decreased. The resistance difference generated in two superconducting units also was decreased. Therefore, we confirmed that the differences of critical behaviors between superconducting units by application of magnetic field were decreased. By this results, we could be decided the optimum number of turns of reactor to apply magnetic field.