• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.4
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• pp.641-644
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• 2007

The electro-mechanical mercury relay is used as an auxiliary relay of power facility because it is superior to operating time and no-bounce. So the KEPCO had used the mercury relay for operating HVDC(High Voltage Direct Current) system. But it has many problems with facility operation by occurrence of mercury evaporation, held contact point and malfunction according to long term use, furthermore it is forbidden to produce for fear of environmental pollution in 2002. This paper presents the no-mercury relay development, comparison test and application.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.606-608
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• 1995

A thermally actuated micro-relay using a mercury-contact has been designed and fabricated. The mercury actuation was achieved by external nitrogen pressure and the mercury-contact was moved by actuation pressure of 110torr in the 100${\mu}m$ wide microchannel. The Injection pressure of mercury was 300torr in the 60${\mu}m$ wide microchannel of the micro relay structure.

• ETRI Journal
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• v.45 no.3
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• pp.543-550
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• 2023

Electrostatic discharge (ESD) testing for human body model tests is an essential part of the reliability evaluation of electronic/electrical devices and components. However, global environmental concerns have called for the need to replace the mercury-wetted relay switches, which have been used in ESD testers. Therefore, herein, we propose an ESD tester using metal oxide semiconductor-controlled thyristor (MCT) devices with a significantly higher rising rate of anode current (di/dt) characteristics. These MCTs, which have a breakdown voltage beyond 3000 V, were developed through an in-house foundry. As a replacement for the existing mercury relays, the proposed ESD tester with the developed MCT satisfies all the requirements stipulated in the JS-001 standard for conditions at or below 2000 V. Moreover, unlike traditional relays, the proposed ESD tester does not generate resonance; therefore, no additional circuitry is required for resonant removal. To the best of our knowledge, the proposed ESD tester is the first study to meet the JS-001 specification by applying a new switch instead of an existing mercury-wetted relay.

• ETRI Journal
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• v.3 no.4
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• pp.11-15
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• 1981

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.173-175
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• 2005

Malfunction of Klippon relay in Cheju-Haenam HVDC system has been caused by the inflow of high voltage arc. In this paper, we have studied on the theoretical examination and data analysis of Klippon relay, and the countermeasures against the problems were suggested according to their causes. Grounding problem in Klippon relay is removed by one-point earth connection and by modification of grounding circuit. The effects of over current surge was removed by attaching blocking diodes by series In Klippon relay to remove surge input in Klippon relay's mercury contact. The problem of Induced overvoltage by 86re1ay excitation coil, was removed by attaching Free-wheeling diode in parallel with the excitation coil of Lock-out relay.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.5
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• pp.623-631
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• 2011

Light emitting diodes (LEDs) which can produce uniform luminescence need a very difficult and complex procedure because LEDs have strong and straight optical property. One of the major parameters for LED production is the determination of the viewing angle. However, in the present, there is still no available production technology to measure LED viewing angle and optical property. In this study, we developed a five-side LED viewing angle and optical property measurement system, having a source meter that uses a high speed switching photo relay instead of a mercury relay. This new measurement system can measure the viewing angle at a very high accuracy of ${\pm}0.66^{\circ}$. This new technology presents a great potential for fast and reliable LED mass production, which can significantly cut down the cost from savings in production time.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.425-426
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• 2006

수은접점형 전기기계식 릴레이는 동작 속도와 no-bounce 특성이 우수하여 전력설비 보조 릴레이로 많이 사용되고 있으며 우리 한국전력공사 직류송전방식 HVDC 설비에도 설치되어 운영 중이다. 그러나 수은접점은 장기 사용시 열화현상으로 수은 증발, 접점 고착과 뭉침현상에 의한 빈번한 오동작 발생 및 환경오염 우려로 2002년 전 세계적으로 생산중단 되어 설비운영상 문제점으로 부각되고 있다. 본 논문은 운영중인 설비유지보수를 위하여 동일한 기능수행이 가능한 무수은형 카드릴레이 개발과정, 비교시험 및 설치운영에 대한 방안에 대하여 고찰하였다.