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梁光鎬(Kwangho Yang),朱玧魯(Munno Ju),明聖鎬(Sungho Myung),吉暻碩(Gyungsuk Kil),黃琪鉉(Gihyun Hwang),李東一(Dongil Lee) 대한전기학회 2006 전기학회논문지A Vol.55 No.4
HVAC transmission lines must be designed to satisfy environmental regulations. Therefore it is necessary to pre-evaluate environmental problems for transmission line designer using prediction program. In this study, environmental design software, TLCALC(Transmission Line CALCulation) for transmission lines was developed as a comprehensive window program. It has 6 modules that are audible noise, radio noise, television noise, magnetic field, electric field and conductor surface gradient. TLCALC solved a few problems in use of the existing foreign tools and took several advantages as follows; ① It is a common tool that solves calculating limitations of foreign formulas, ② It has wide application ranges and enhances accuracy of prediction. ③ It can be applied to almost transmission line configurations in Korea. ④ Experienced designers can get the results of calculation within about 15 minutes. Because the use of TLCALC is easy and practical, this program will be usefully applied to the environmental friendly design and construction of transmission lines. In the future, it is expected that public complaints and social environmental cost will be reduced by the use of TLCALC.
초고압 직류 가공 송전선로에서 발생되는 이온 계측시스템 개발
朱玧魯(Munno Ju),梁光鎬(Kwangho Yang),李東一(Dongil Lee),申玖容(Kooyong Shin),林才燮(Jaeseop Lim) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
The electrical discharge of high voltage direct current(HVDC) overhead transmission line generate audible noise, radio noise, electric field, ion current and induced voltage on the ground. These items are major factors to design environmentally-friendly configuration of DC transmission line. Therefore, HVDC transmission lines must be designed to keep all these corona effects within acceptable levels. Several techniques have been used to assess interference caused by ions on HVDC overhead transmission line. In this study, to assess the ion characteristic of DC line, the ion current density and induced voltage caused by ion flow were measured by plate electrodes manufactured from a metal flat board and charged bodies, respectively. The charged body has two types of cylinder and cylindrical plate. From the results of calibration experiments, the sensitivity of flat electrode and charged body can be obtained. At present, the developed system is used to investigate the ion generation characteristics of Kochang DC ±500㎸ test line.
초고압 직류 가공송전 후보 도체방식의 이온류 환경특성 코로나 케이지 모의시험
朱玧魯(Munno Ju),梁光鎬(Kwangho Yang),李東一(Dongil Lee),申玖容(Kooyong Shin) 대한전기학회 2007 전기학회논문지 Vol.56 No.10
Small ions generated at conductor corona sources remain in the atmosphere until they recombine with ions of opposite polarity, attach to aerosols, or make contact with an object. Ion current density is major factor to design conductor configuration of DC overhead transmission line. Several techniques have been used to measure the ion current of HVDC overhead transmission line. In this study, the ion current density was measured by a plate electrode made of a metal flat board at DC corona cage. The sensitivity of the plate electrode is 0.156㎂/㎡/V. To obtain an useful database on corona discharge, it is necessary to do corona test on several kinds of conductor bundles. Therefore, a number of experiments were conducted on several kinds of conductor bundles. To reliably analyze ion effects, corona cage test data were obtained over a long period of time under various weather conditions and expressed as a statistical distribution. Ion current density distribution in foul weather shows a significant increase in levels over the corresponding fair weather. Based on this results, we evaluated the environmental characteristic caused by ion flow of three candidated conductor bundles.
HVDC ±500 ㎸ 가공 송전선로의 최적 도체방식 선정을 위한 전기환경특성 평가
朱玧魯(Munno Ju),吉暻碩(Gyungsuk Kil),梁光鎬(Kwangho Yang),李性斗(Sungdoo Lee),黃琪鉉(Gihyun Hwang) 대한전기학회 2006 전기학회논문지C Vol.55 No.11
Corona interferences, such as radio noise, audible noise and television noise, need to be taken into account in the design of HVDC transmission line conductor configuration. Therefore the line designer requires data from which to estimate the corona performance of any set of conductors. To get a sufficiently complete set of design data, it is necessary to examine the corona test of a large number of conductor geometries. This paper presents the results of corona cage test among three types of candidate conductors. It is quite clear from test results that the conductor geometries play an important role in establishing the magnitude of corona noise. Corona noise data from corona cage test are expressed as a statistical distribution of results obtained over long periods of time and various weather conditions. Therefore we can determine an environmentally-friendly conductor bundle for HVDC overhead transmission line. Based on this finding results, various simulations about HVDC line configurations, such as pole space and pole height, will be conducted. And then finally an optimal configuration for HVDC transmission line will be decided.
HVDC 가공 송전선로 전기환경특성 모의시험용 코로나 케이지 계측시스템 개발
朱玧魯(Munno Ju),吉暻碩(Gyungsuk Kil),梁光鎬(Kwangho Yang),李性斗(Sungdoo Lee) 대한전기학회 2006 전기학회논문지C Vol.55 No.5
Corona characteristics of conductors are dependent on the electric field conditions in the immediate vicinity of the conductors. In case of DC transmission line, particularly, the space charge plays an important role in the electric field distribution. Therefore, DC corona cage simulation is necessary for long-term test in the same conditions. This paper presents the results of designing and constructing hardwares such as DC power supply, measurement system and DAS to carry out the simulation. The corona cage longitudinally is divided into five equal length sections and three inner sections of those are isolated from the ground of outer cage. The measurement items are radio noise, corona current, television noise, audible noise and meteorological conditions. In the next step, various simulations about the type and configuration of two or three candidate conductors will be conducted. And then finally an environmentally-friendly conductor for HVDC overhead transmission line will be decided.