• 한국조명전기설비학회지:조명전기설비
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• 제6권5호
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• pp.38-44
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• 1992

In this paper, electrification pipe modeled on the oil path that insulating oil flow in the high power transformer is manufactured in order to prevent the accident cause from streaming electrification generated when insulating off flow at a solid-liquid interface, and the streaming current is measured and analyzed according to the shape of oil path in electrification pipe. From the result of this study, the streaming current increases linearly with increasing of a oil velocity and it increases at lower temperature and decreases at higher temperature than [$46^{\circ}C$]. The smoother the flow of insulating oil is the more the streaming current decreases.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 추계학술대회 논문집
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• pp.361-364
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• 1995

The static charges are generated by streaming electrification phenomena when insulating oil flowing by force for the purpose of cooling at the internal of Ultra-high power transformer. In this thesis, their elimination method was studied. The falter represents a greet much electrification characteristics because falter has large interfaces with liquid. In this paper, the streaming-electrification phenomena of insulating oil by metal filter were measured by mesh number, oil flow rate, oil temperature and a kind of mesh and The effect of charge elimination by metal filter generated minus ion was measured.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1993년도 춘계학술대회 논문집
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• pp.72-75
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• 1993

The characteristic of streaming electrification and static charge diminution in Cu, Fe and Sus pipes were investigated. The Cu and Fe pipes are charged positively, whereas the Sus pipes are charged negatively. Electrification rate in Cu and Fe pipes increases with increasing a pipe length for no-charged insulating oil. The electrification rate in Cu and Fe pipes abruptly increase with increasing the temperature and flow rate of insulating oil but decrease in Sus pipes. The current flows as a direction of insulating oil in all pipes.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.329-333
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• 1996

In this Paper, the streaming electrification of transformer oils generated at the interface of transformer oils and the AC breakdown with impurity is studied. The electrification current is measured by the electrometer connected the faraday cage. And a oil velocity is maintained equally. In case of the AC breakdown test, the temperature are 30[$^{\circ}C$], 50[$^{\circ}C$], 80[$^{\circ}C$] and 90[$^{\circ}C$], repetitively. As a result of breakdown experiment, the dielectric breakdown strength is decreased in low temperature region and is increased in high temperature region according to increase of contained sodium. In case of streaming electrification experiment, the streaming current is more increased with the specimen contained sodium than the original specimen.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 C
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• pp.1534-1536
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• 1997

In this paper, the streaming electrification phenomena of insulating oil by metal filters and the charge elimination method were investigated. When BTA and surfactant is molten in insulating oil, BTA appear the prevention of electrification from about 5ppm and surfactant (SP-S10, SP-S30) appear the prevention of electrification from about 20ppm. BTA increase the conductivity of insulating oil but surfactant and antioxidant(DBPC) isn't affect that.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.476-477
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• 2007

The development of real-time monitoring technology provides reliable, timely information of railway maintenance and play a important role in determining the conditions of railway electrification system. Image motoring and wireless communication systems are currently used as remote transducer for real-time monitering. In this paper, we describe a real-time monitoring technology of railway electrification system based on the concept of high-voltage application, using the image processing and telemetry system methodology. the system and its performance for especially with regard to real-time monitering and railway electrification maintenance.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.500-501
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• 2007

Automation systems for higher performance and efficiency in railway electrification systems are driving ever more demanding needs for new condition monitering systems which can consist of sensors connected to the substation and catenary systems. This paper reviews the recently developed condition monitering system, based on a IP network-based multi-agent system, wireless communications and sensor networks for railway electrification system. A new concept for information management, condition monitoring and control of power transmission are considered as railway automation in electrification system.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.602-606
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• 2006

The electrostatic is well known phenomena. The fires and explosions caused by electrostatic occur often in the coating mechanical system. This paper presents various cases of electrostatic hazards, reasons why electrostatic hazards are happened, and methods for preventing electrostatic hazards. Generally the electrostatic can be lead to corona discharging, streaming electrification, and impinging electrification in the coating process. Corona discharging happens at electrostatic spray gun with 70 kV. Streaming electrification occurs at mixing process between paint and thinner, and transportation process with thinner. Impinging electrification is shown when the thinner are sprayed to drums. For the purpose of preventing the electrostatic discharge and damage, conductors should be ground, surface electric potential of should be decreased in using electrostatic shielding and ground, and flow of thinner should be controlled acceptable velocity.

• 한국조명전기설비학회지:조명전기설비
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• 제8권4호
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• pp.55-62
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• 1994

본 논문에서는 기존의 펌프나 가스를 이용한 강제유동식 시스템과는 달리 회전원통을 이용한 유동대전현상에 대하여 연구하여, 강제유동식에서의 대전특성과 비교, 분석하였다. 연구결과, 회전원통 시스템에서의 회전원통의 회전속도 및 온도에 따른 유동대전 특성은 강제유동식과 같은 경향을 보여 회전원통 시스템이 유동대전현상을 연구하는데 적합함을 알 수 있었다. 회전원통시스템은 강제유동식에 비하여 실험장치의 기계적 구조가 간단하고, 적은 양의 절연유만이 필요하며, 여러 가지 다른 물질로 실험하기가 비교적 편리하였다. 또한 대전 방지제의 첨가나 절연유의 열화에 따른 대전현상 등을 연속적으로 측정할 수 있는 특징이 있음을 알 수 있었다.

• 대한전기학회논문지
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• 제40권6호
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• pp.619-625
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• 1991

Phenomena of streaming electrification of insulting oil(T.O) is studied where the oil is contacted with solid insulating materials when it is pumped through a circulating system in a large power transformer. The leakage current, the electrical potential at the neutral terminal point of the transformer and the surface electrical potential of the oil are investigated. And the leakage current from the neutral terminal point is measured as a function of a bias polarity applied to a transformer case to investigate the polarty of ion which is absorbed in the case at the interface between the case and oil. As a result, it is found that insulating materials, and it is suggested that the leakage current is the sum of the relaxation current by positive charge from insulating oil to the neutral terminal point and by electrification current from negative charge electrified by the contact with solid insulating materials.