• Proceedings of the KIEE Conference
• /
• 2001.04a
• /
• pp.44-46
• /
• 2001

This paper describes the use of the PHOENICS CFD package for the simulation of the high-current period of the arcing process in a hybrid rotating arc/auto expansion by interrupter. The operating principle of this device depends on rapid arc rotation due to the magnetic field created by the fault current through a coil which is mounted on contacts and also relies on the principle of thermal expansion created by arc energy in extinguishing chamber and finally causes pressure rise in expansion volume. This paper is divided into three main sections. The first gives a brief overview of the interrupter. The second section gives a full description of the methods used in the calculation. The final section presents some sample results for the hybrid interrupter.

• Proceedings of the KIEE Conference
• /
• 1997.07a
• /
• pp.330-332
• /
• 1997

In this paper, a development of the 7.2kV class $SF_6$ gas electromagnetic contactor which is used a rotary-arc principle in interrupting method is presented. A prototype contactor is made. In the interrupting small current permanent-magnet is used and in the interrupting high current the coil through which arc current itself flows is used. Successfully the prototype contactor carrys out the making, the braking and short time test.

• Proceedings of the KIEE Conference
• /
• summer
• /
• pp.788-790
• /
• 2004

This paper describes the phenomenon of the molten metal bridge theory of the arc discharge at opening contacts. And we analyze the magnetic force and drag force acting on the arc column in the DC magnetic contactor Arc cooling time by the force convection is calculated in the thermal dynamic equation using mean temperature method. Since arc gas lost conduction characteristics below a such temperature, it verify that the process of forming and extinguishing arc is able to analyze in terms of temperature characteristic by simulation and experiments of the 3 types arc extinction unit. It propose the practical simulation method to improve the electrical endurance of dc contactor.

• Proceedings of the KIPE Conference
• /
• 2017.07a
• /
• pp.471-472
• /
• 2017

DC 전력전송은 송전선로의 원거리화 및 절연내력의 저감과 같은 장점이 있으나, 전류 차단 시 큰 아크로 인하여 고속 차단기 구성이 어렵다는 큰 단점이 있다. 최근 소용량 DC 전력전송에 있어서 큰 과제인 고속차단을 위해 전자식 차단기에 대한 연구가 이루어지고 있다. 본 연구에서는 변압기와 결합한 SCR을 이용한 새로운 전자식 차단기를 제안한다. 제안된 방식은 SCR 오프시 변압기를 이용하여 SCR에 역전압을 인가하므로 전류를 소호하는 방식이다. 또한 Psim을 이용한 시뮬레이션을 통하여 제안된 방식의 타당성 검증하였다.

• Proceedings of the KIEE Conference
• /
• 2000.11b
• /
• pp.265-267
• /
• 2000

The RMU is a power apparatus which is used in loop network distribution system. This paper considers the development of the hybrid interrupter in RMU which adopts both rotating arc and thermal expansion technology. Because of the operating principle of this device, it has some merit, compared with other interrupter. In this research, the geometric construction of the interrupting techniques are given and experimental results of hybrid interrupter which is developed by new technology is introduced.

• Proceedings of the KIEE Conference
• /
• 2001.10a
• /
• pp.6-8
• /
• 2001

차단기 내에 위치하는 이동부에서 작용하는 힘은 외부 조작력 외에도 여러 가지가 존재하며 이들 힘의 상호작용으로 인해 이동부의 스트로크 곡선이 결정된다. 또한, 이 힘들에 따라 차단기에서의 아크 소호시간, 차단기의 성능 등이 영향을 받으므로 이동부에서 작용하는 힘들의 해석이 필요하다. 이 힘들은 유체의 밀도와 압력, 이동부의 기계적 구조 등을 고려하여 해석이 되며, 이 힘들을 해석함으로써 결과적으로는 차단기의 동작특성을 파악할 수 있다. 본 논문에서는 이러한 힘들을 정의하고 이들 각각에 대하여 해석한다. 이동부에서 작용하는 힘들을 해석하기 위해서 먼저 이동부에서의 운동방정식을 세우고 이를 시뮬레이션하여 스트로크 곡선과 이동부에서의 힘들을 얻는다. 이렇게 얻어진 결과를 실험 값과 비교하고 이동부에서 작용하는 힘들에 대해 논의한다.

• Proceedings of the KIEE Conference
• /
• 2001.10a
• /
• pp.18-20
• /
• 2001

This paper describes are quenching chambers of three type for Magnetic Switch and analyzes electromagnetic blowout force acting on the arc using 3D finite element method we make prototype device of each model and establish characteristics of arc quenching by measuring arcing time. This paper compares electromagnetic blowout to inverse arcing time. As the result this proposes the improving method for arc quen performance in DC magnetic switch.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.17 no.6
• /
• pp.495-499
• /
• 2012

Recently, DC distribution systems become hot issues since DC type loads increase rapidly according to the expansion of IT equipment such as computers, servers, and digital devices; DC type loads will cover 50% for all electricity loads in 2020 which was mere 10% in 2000. DC distribution systems are also accelerated by the expansion of renewable power systems since they are easy to be interfaced with DC grids rather than AC grids. However, removing the fault current in DC grids is comparably difficult since the current in DC grids has non zero-crossing point like in AC grids. Thus, developing dedicated DC circuit breakers for DC grids is necessary to get safety for human and electrical facilities. Magnet arc extinguishing method is proper to small size DC circuit breakers. However, simple Magnet arc extinguishing method is not enough to break inductive fault currents. This paper proposed a novel DC circuit breaker against inductive fault current defined by IEEE C37.14-2004 Standard for Low-Voltage DC Power Circuit Breakers Used in Enclosures. The performance of the proposed DC circuit breaker was verified by an experimental circuit breaker test system built in this research.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.23 no.5
• /
• pp.299-304
• /
• 2018

An ideal circuit breaker should supply electric power to loads without losses in a conduction state and completely isolate the load from the power source by providing insulation strength in a break state. Fault current is relatively easy to break in an Alternating Current (AC) circuit breaker because the AC current becomes zero at every half cycle. However, fault current in DC circuit breaker (DCCB) should be reduced by generating a high arc voltage at the breaker contact point. Large fire may occur if the DCCB does not take sufficient arc voltage and allows the continuous flow of the arc fault current with high temperature. A semiconductor circuit breaker with a power electronic device has many advantages. These advantages include quick breaking time, lack of arc generation, and lower noise than mechanical circuit breakers. However, a large load capacity cannot be applied because of large conduction loss. An extinguishing technology of DCCB with polymeric positive temperature coefficient (PPTC) device is proposed and evaluated through experiments in this study to take advantage of low conduction loss of mechanical circuit breaker and arcless breaking characteristic of semiconductor devices.

• Proceedings of the KIEE Conference
• /
• 2000.07b
• /
• pp.919-921
• /
• 2000

This paper considers the research of the hybrid interrupter which adopts both rotating arc and thermal expansion technology. The operating principle of this device depends on rapid arc rotation due to the magnetic field created by the fault current through a coil which is mounted on contacts and also relies on the principle of thermal expansion created by arc energy in extinguishing chamber and finally causes pressure rise in expansion volume. In this research, the principle of the interrupting techniques are given and experimental results of hybrid interrupter which is developed by new technology is introduced.