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송재용(J. Y. Song),길경석(G. S. Kil),신광철(G. C. Shin),박종국(J. K. Park),심재원(J. W. Sim) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, a ubiquitous sensor for condition monitoring of insulators and lightning arresters installed in power distribution lines and electric traction vehicles is presented. The sensor consists of two parts; a leakage current measurement and a lightning surge detection. Measured data are transmitted to a supervisory computer through ZigBee protocol based on IEEE 802.15.4. To detect leakage current, a window type Mn-ZCT is used and a low-noise amplifier with a gain of 60 ㏈ is designed, and this can measure leakage current in ranges of 100 ㎂ ~ 5 ㎃. A sample-hold (S/H) and a Rogowski coil are injected to analyze the magnitude of surge current in ranges from 500 A to 10 ㎄ with 8/20 ㎲-waveform.
길경석(G. S. Kil),송재용(J. Y. Song),김일권(I. K. Kim),문승보(S. B. Moon),차명수(M. S. Cha) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Conventional surge counters set up in grounding wire of lightning arresters measure only surge frequency, and do not provide enough data on surge current. However, we need many parameters like the amplitude, the polarity and the occurred time as well as frequency of surge currents to estimate the arrester condition. In this paper, we designed and fabricated a surge counter based on a microprocessor technology, which can measure the majority of parameters mentioned above. An exclusive sample and peak-hold IC was adopted to detect the amplitude of surge current having a short duration. The occurred time of surge current is offered from the real-time-clock(RTC) chip, and all the acquired data are saved on a 256kB E²PROM. Also, these data are transmitted to a personal computer by a serial communication protocol.
길경석(G. S. Kil),송재용(J. Y. Song),김일권(I. L. Kim),문승보(S. B. Moon),한주섭(J. S. Han) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Selection and application recommendations of lightning arresters for DC electric traction vehicles are presented. To decide arrester specification such as continuous operating voltage (COV, U<SUB>C</SUB>), rated voltage (U<SUB>R</SUB>), and nominal discharge current (I<SUB>n</SUB>), variations of system voltage and surge currents flowing arresters were analyzed in running-service of traction vehicles. System voltages increased up to 1,800 V during anti-breaking. Surge currents recorded 3 times per running-service-route and their magnitudes were ranges of 150 A ~ 2 ㎄. From the field measurement and consideration of EN50163, COV, U<SUB>C</SUB>, and U<SUB>R</SUB> for the 1,500 V<SUB>DC</SUB> traction vehicles were proposed.
길경석(G. S. Kil),송재용(J. Y. Song),문승보(S. B. Moon),한주섭(J. S. Han),박대원(D. W. Park) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper describes the performance evaluation and the diagnostic technique for DC railway arresters. We carried out field measurements on DC electric train to know the frequency and the magnitude of surge currents generated. Surge currents of 1 ~ 3 times were recorded in one running service route and their magnitudes were ranges of 150 A ~ 2 ㎄. A surge current generator which produces 8/20 , 10 ㎲ was set-up and an acceleration ㎄ experiment was carried out to propose an optimum diagnostic standard for the DC electric railway arresters. After the repetitive application of 3,000 times, the reference voltage decreased by 4.5 % and the leakage current was below 10 A at 1650 ㎶, maximum continuous operating voltage (MCOV). Also, we designed a railway arrester tester which is based on the experimental results. The tester analyzes reference voltage and leakage current automatically, and decides the arrester condition.
이종혁(Lee J. H),마지훈(Ma J. H),유련(Yu L),이재걸(Lee J. G),원성연(Won S. Y),이석원(Lee S. W),김영근(Kim Y. G),길경석(Kil G. S) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
In recent years, the companies of electric power equipment for MV and HV classes trend to develop the eco-friendly insulated(solid, eco-gas, air etc.) switchgear which replaces existent SF. gas insulated switchgear due to environmental problems such as global warming and so on. This paper makes reference to the newly developed Solid Insulated Switchgear (SIS) which uses the eco-friendly material such as epoxy for insulation. The insulation of the solid insulated switchgear (SIS) is composed of an epoxy, vacuum and air. The solid insulated switchgear (SIS) is a state of the art product. The advantages of SIS are advanced reliability, economical efficiency, safety, maintenance free, reduction of installation area and the protection of environment. The solid insulated switchgear (SIS) is FE Analyzed such as electromagnetic, mechanical, thermal and fluid in order to find the optimal design. Thens SIS has been verified by international standard test. (IEC 62271 - 100 and so on.) As a result of this, the solid insulated switchgear (SIS) has been estimated as an alternative for eco-freinedly MV class switchgear.