• Title/Summary/Keyword: Current Circuit Breaker

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Interruption analysis of the SFCL-combined DC circuit breaker system using current-limiting technology

  • Kim, Jun-Beom;Jeong, In-Sung;Choi, Hye-Won;Choi, Hyo-Sang
    • Progress in Superconductivity and Cryogenics
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    • v.18 no.4
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    • pp.30-34
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    • 2016
  • In this study, a SFCL-combined DC circuit breaker system was proposed by applying the current-limiting technology for DC circuit breaking. The SFCL-combined circuit breaker system consists of a mechanical DC circuit breaker combined with superconductors. To ensure the reliable structure and operation of the SFCL-combined circuit breaker system, a simulation grid was designed using the EMTDC/PSCAD program, and simulation was conducted. The results showed that the SFCL-combined DC circuit breaker system with superconductors limited the maximum fault current by 37%. In addition, the burden on the DC circuit breaker was decreased by 87%.

DC Superconducting fault current limiter characteristic test with a DC circuit breaker

  • So, Jooyeong;Choi, Kyeongdal;Lee, Ji-kwang;Kim, Woo-Seok
    • Progress in Superconductivity and Cryogenics
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    • v.23 no.2
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    • pp.19-23
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    • 2021
  • We have studied the breaking system that combines a resistive superconducting fault current limiter (SFCL) and a DC circuit breaker for DC fault current. To verify the design of the 15 kV DC SFCL, which was driven from the previous work, a 500 V DC system was built and a scale-down SFCL were manufactured. The manufactured SFCL module was designed as a bifilar coil which is a structure that minimizes inductive reactance. The manufactured SFCL module has been experiment to verify characteristics of the current-limiting performance in the DC 500 V system. Also, the manufactured FCL module was combined with the DC circuit breaker to be experimented to analyze the breaking performance. As a result of the experiment, when SFCL was combined to the DC circuit breaker, the energy dissipation received by the DC circuit breaker was reduced by up to 84% compared to when the DC circuit breaker operates alone. We are preparing methods and experiments for the optimal method for much higher performance as a future work.

The Characteristic Study for Small Current Breaking of High Speed DC Circuit Breaker (직류고속도차단기의 소전류 차단 특성연구)

  • Min Byung-Hoon;Jang Woo-Jin;Ko In-Suk
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.8
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    • pp.396-402
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    • 2006
  • Even the case DC circuit Breaker have good quality for interruption of high current like heavy load current, short-circuit current, the verification for small current breaking capability of circuit breaker should be performed. It comes from the reason DC small current breaking failure can be lead to break out second heavy fault condition and in the long run substation shutdown. In this paper, we can find the characteristics of DC small current and international test standard discription about small current breaking and one of the proper solution to get over it.

A Study on Development of Current Limiting solid-state AC circuit Breaker (한류형 반도체 교류 차단기 개발에 관한 연구)

  • Lee, Woo-Young;Kim, Yong-Joo
    • Proceedings of the KIEE Conference
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    • 1990.11a
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    • pp.73-77
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    • 1990
  • In this paper we describe the solid-state ac-circuit breaker which has the characteristic of both a half cycle circuit breaker and a current limiting circuit breaker. This circuit breaker has a current limiting resistor in order to surprises the fault current to a certain level and discharge the energe included in circuit inductor. We explain the effect of circuit parameter on transient phenomena of switch device by using EMTP and finally design the control circuit consisted synchronous closing circuit, over- current detecting circuit and sensing circuit of rate of rise of fault current.

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Arc Extinguishment for Low-voltage DC (LVDC) Circuit Breaker by PPTC Device (PPTC 소자를 사용한 저전압 직류차단기의 아크소호기술)

  • Kim, Yong-Jung;Na, Jeaho;Kim, Hyosung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.5
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    • pp.299-304
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    • 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.

Development of Circuit Breaker Automatic Selection Program (선박 배선용 차단기 자동 선정 S/W 개발)

  • Ha, Sangho
    • Special Issue of the Society of Naval Architects of Korea
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    • 2017.10a
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    • pp.88-92
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    • 2017
  • As the considerable request of the fast and accurate way of the selection of circuit breaker is increased, we introduce the development of software of circuit breaker selection for the marine use. Originally, the selection of circuit breaker has been carried out by manual in the marine project. It is not the easy work to select the proper type of circuit breaker to check the time-current characteristic curves of each type of circuit breakers for the various type of loads. In this regards, we developed the software to select the proper type of circuit breaker to confirm fast and accurately. And, we introduce the course of the development of the software for the selection of circuit breaker.

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Three-phase Fault Calculation by IEC 60909 (IEC 60909에 의한 삼상 고장계산)

  • Son, Seok-Geum
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.1
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    • pp.12-18
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    • 2014
  • This paper analyzes how to calculate the three phase short circuit current calculation procedures used in the IEC 60909 short circuit. It presented the new procedure of the fault current for the interrupting capacity of the circuit breaker. This procedure is applied to the future power system and calculates the fault current. Power demands are increased because of the growth of the economy for this reason, the fault current of the power system is largely increased and the fault current procedure for the proper interrupting capacity calculation of the existing or the new circuit breaker is essential. How to calculate the three phase short circuit current for ac electrical system and select the high voltage and low voltage circuit breaker based on IEC 60909 standards.

A Novel DC Solid-State Circuit Breaker for DC Grid (DC Grid를 위한 새로운 구조의 DC Solid-State Circuit Breaker)

  • Kim, Jin-Young;Kim, In-Dong;Nho, Eui-Cheol
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.4
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    • pp.368-376
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    • 2012
  • According to developed distributed generators, Solid State Circuit Breaker(SSCB) is essential for high power quality of DC Grid. In this paper, a simple and new structure of DC SSCB with a fast circuit breaker and fault current limiter is proposed. It can help to choice low specification of elements because of the limiting of fault current and achieve economic efficiency for minimizing auxiliary SCRs. Also all of SCRs have little switching loss because they operate under ZVS and ZCS. Through simulations and experiments of short-circuit fault, the performance characteristic of proposed circuit is verified and a guideline is so suggested that the DC SSCB is applied for a different DC grid using formulas.

An Improved Topology of DC Circuit Breaker Based on Inverse Current Injection Method (역전류 주입방식기반의 DC차단기의 개선된 토폴로지)

  • Cho, Young-Bae;Son, Ho-Ik;Kim, Hak-Man;Kwak, Joosik;An, Yong-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.11
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    • pp.1491-1496
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    • 2014
  • VSC-HVDC system is vulnerable to a DC fault because the fault current can be injected from AC system to DC system during the fault. Therefore, DC circuit breaker is required to isolate faults in VSC-HVDC system. The inverse current injection method of circuit breaker has been considered as DC circuit breaker. However, the topology has drawback that the breaking time is longer than hybrid circuit breaker using semiconductor devices. In order to solve this problem, this paper proposes an improved topology of circuit breaker based on inverse current injection method. In addition, the proposed topology will be compared with the existing topology. And we will verify its effects by using the simulation results.

Analysis of Operation Characteristics of DC Circuit Breaker with Superconducting Current Limiting Element (초전도 전류제한소자를 적용한 DC 차단기의 동작 특성 분석)

  • Jung, Byung-Ik
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.6
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    • pp.1069-1074
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    • 2020
  • Since DC has no zero point, an arc occurs when the DC circuit breaker performs a shutdown operation. In this case, a fatal accident may occur in the circuit breaker or in the grid, depending on the magnitude of the arc. Therefore, the shutdown performance and the reliability of the circuit breaker are important in the commercialization of HVDC. In this study, a superconducting LC circuit breaker was proposed to improve the performance and the reliability of the DC circuit breaker. The superconducting LC circuit breaker applied a superconducting coil to the inductor of the existing LC circuit breaker. Other than limiting the initial fault current, it also creates a stable zero point in the event of a fault current. To verify this, simulation was performed through EMTDC/PSCAD. Furthermore, the superconducting LC circuit breaker was compared with the LC circuit breaker with a normal coil. As a result, it was found that the LC circuit breaker with the superconducting coil limited the initial fault current further by approximately 12 kA compared to the LC circuit breaker with a normal coil. This reduced the arc extinguish time by approximately 0.16 sec, thereby decreasing the elctrical power burden on the circuit breaker.