• Journal of Electrical Engineering and Technology
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• 제9권5호
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• pp.1704-1711
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• 2014

Sandy and dusty weather condition often occurs in the high altitude areas of China, which may greatly influence the corona generated radio interference (RI) characteristics of the bundle conductors of 750 kV AC power transmission lines. Corona generated RI of the conductors of the 750 kV AC power transmission lines used in practice is measured by EMI receiver with a coupling circuit and a coupling capacitor connected between the high voltage side and the earth side in fine and sandy and dusty condition. The measuring frequency is 0.5 MHz, and the quasi-peak detection is used. RI excitation function is calculated based on the corona RI current measured by the EMI receiver. Corona generated RI characteristics were analyzed from sand concentration and sand particle size. The test result shows that the corona generated RI excitation function is influenced by the sandy and dusty condition. Corona discharge of the conductors is more serious in sandy and dusty condition with an ultraviolet (UV) detector. Corona generated RI excitation function increases with the increase of sand concentration and also increases with the increase of particle size.

• 전기학회논문지P
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• 제58권4호
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• pp.447-450
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• 2009

In order to protect conductors from oscillations or vibrations due to winds, spacer dampers are installed on overhead transmission lines. Generally the spacer damper clamp can move slightly according to oscillation directions, namely in longitudinal, vertical & horizontal directions. This is for reducing fatigue phenomena of the conductor. But the high longitudinal- displacement of the clamp raises a doubt for its necessity. Then this paper carried out oscillation tests by using 4 bundle test lines, to know the relation between longitudinal displacement and oscillation. and suggests design necessity of the longitudinal articulation part for spacer damper clamps.

• 대한전기학회논문지
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• 제45권3호
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• pp.451-455
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• 1996

This paper specified the measurement results conducted by the Korea Electric Power Research Institute (KEPRI) 765kV double circuit transmission test line that measured the audible noise, hum noise, radio interference, electric field and aeolian measurement. This test line consists of 6-480mm$^{2}$ conductors per phase. The analysis of the test results shows that this 6-Rail conductor bundle satisfies the audible noise criterion under the stable rainy weather condition and the radio interference level under the fair weather. And the other items are also agreed with the design level criterion. (author). 9 refs., 7 figs., 2 tabs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.245-247
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• 1998

Compacting of Overhead power transmission lines can be helpful in solving many problems, such as reduction of land and forest losses. decrease of the line's environmental impact zones, improvement of its electrical performance. And in overhead transmission lines, regular polygon configuration of bundled conductors are considered and adopted. This papers are compared to subconductor surface charges and electric field gradients, line parameters, natural capacities for regular polygon and modified configurations in 345kV 4 bundle 2 circuits horizontal type transmission lines.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 C
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• pp.1517-1519
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• 1994

This paper describes electrical environmental study of a 765kV double circuit test line. Corona performance on several candidate conductor bundles has been investigated in the corona cage (single phase simulation facility) since 1984. We have known that six RAIL conductor bundle is the most suitable for the 765kV transmission Line, [3] To investigate electrical environmental impact of the future commerciale line, we build a full sacle 765kV test line in 1993. The test results of Audible Noise, Radio Interference, TV Interference from August, 1993 to Jan. 1994 were measured as $48.7[dBA](L_{50})$. $57.4[dB{\mu}V/m]$(Fair weather, $L_{50})$. $14.5[dB${\mu}$V/m]$(Fair weather, $L_{50}$). We have found that the Audible Noise data were very close to the predicted(48.5 [dBA]) by BPA Corona and Field Effects Computer program, however, the RI and TVI data were much higher than predicted(42 [dBmV/m], $7.9[dB{\mu}V/m)$ by the BPA program. We have investigating the reason of the difference. In the constructing of full scale test line, we developed the tubular tower, 765kV test transformer and hardwares of 765kV transmission line insulator strings. Also we will investigate the effects of plants under the 765kV test Line.

• 전기학회논문지
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• 제59권9호
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• pp.1638-1643
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• 2010

HVDC is better economic method than HVAC in case of long distance transmission and it is possible to interconnect transmission lines regardless of difference of power frequency. The electrical environment problems of HVDC overhead transmission line are electric field, charged voltage, ion current and so on. For biopolar HVDC lines, most of the ions are directed toward the opposite polarity conductor, but a significant fraction is also directed toward the ground. These problems are major factor to design configuration of HVDC overhead transmission line. Therefore, It is necessary to test an environmental characteristics of HVDC overhead transmission line. In this paper, to assess the ion characteristic of HVDC transmission line, continuous measurements have been done on the biopolar single circuit line with ACSR 480mm2-6 bundle conductors of Gochang HVDC Test line. And then the ion characteristics were analyzed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.278-282
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• 2001

The purpose of this study is to introduce a new spacer damper for the bundle transmission lines network. It has the special design, the main characteristics and advantage of this new kind of spacer damper. An Existing spacer damper with bolted clamps, although widely used, is a method of connection with certain disadvantage both as regards assembly on the conductor and in the course of time. Even if tightening torque is correctly applied by using bolt with share head or torque wrench during working time, the aeolian vibration could involve untightening during life time, so the cable can move into the Jaws and wire's breakage appear. To salve this problems, France, Japan and other countries had developed a spacer damper with an automatic system through many years. This new spacer damper is an original automatic clamping device (beltless) which does not require special tool for its installation. This device prevents clamp unlocking problems, ensures a simple installation and ensures a reliable-tightening during life time. Therefore, it is necessary to localize this boltless spacer damper with automate clamping device.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.2077-2078
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• 2008

다도체 송전선로에서 전선 간격 유지 및 진동을 완화시켜주는 역할을 하는 스페이서 댐퍼가 손상 받게 되면 즉시 유지보수 및 교체 작업을 하여야 한다. 그러나 이러한 작업은 송전선로 위에서 이루어지므로 전선의 장력과 작업자의 하중으로 인해 유지보수 및 교체작업이 매우 어렵고, 작업시간이 많이 소요되며, 전선표면 손상, 스페이서 댐퍼의 위치 변동 및 무리한 작업으로 인한 작업안전성 저하 등의 문제점이 있다. 따라서, 상기한 문제점을 해소하고 작업 효율의 상승을 위하여 작업시 각 전선의 간격을 쉽게 벌리고 좁힐 수 있는 작업용 공구인 스페이서지그(Spacer Jig)와 이를 이용한 송전선로의 스페이서 댐퍼 유지보수 및 교체공법을 개발하여 교체작업시간 단축 및 작업안전성을 향상시킨 우수한 기술을 개발하였다.

• KEPCO Journal on Electric Power and Energy
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• 제5권4호
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• pp.249-256
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• 2019

국내에 향후 건설 예정인 도체귀로형 HVDC ±500 kV Double Bipole 가공송전선로의 최적선로 형상을 설계하고 송전선로에서 발생되는 전기환경장해를 검증하기 위해 실증시험장을 구축하여 1년간 전기환경장해 평가시험을 수행하였다. 또한, HVDC Double Bipole 실선로에서 인체의 지표면 전계인지도 평가시험을 통해 HVDC 실규모 실증선로 직하에서 인체가 직류 전계를 감지하는 임계값을 조사하여 HVDC ±500 kV Double Bipole 가공송전선로의 직류전계 설계기준안의 타당성을 검증하였다. HVDC ±500 kV Double Bipole 시험선로의 극형상은 전기환경장해와 운영관점에서 동일한 극성을 대각으로 배치하였으며, 국내 가공송전선로의 전기환경장해의 사회적인 수용성을 고려하여 선로에서 코로나방전이 거의 발생되지 않도록 소도체 방식은 6 도체를 선정하였다. 도체귀로형 HVDC ±500 kV Double Bipole 가공송전선로 방식인 Cardinal×6B를 적용한 실증시험결과, 선로 도체에서 코로나 방전이 거의 발생되지 않았으며, 따라서 지표면 전계와 이온전류밀도는 모두 국내 가공송전선로 설계 기준값을 만족하였다. 또한 선로직하에서 피조사자들에 대한 전계 인지도 평가결과, 피조사자들의 70%는 23 kV/m에 노출되어도 직류전계를 인지하지 못하는 결과를 나타냈다.