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RISS 인기검색어
- 검색키워드
- 저자 : 송태헌(Tae-hun Song) (검색결과 19 건)
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복합소호형 고압차단기 O-CO 동작 차단특성 분석 연구
송태헌(Tae-hun Song),조영만(Young-Maan Cho),고광철(Kwang-Cheol Ko) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.4
The function of high voltage circuit breaker is to clear the fault current and protect the equipment in a power network when the overload or short circuit is generated in the network. High voltage circuit breaker should interrupt short circuit currents not only under Open operation for minimum arcing time but also under Open-CloseOpen operation for maximum arcing time. Self-blast type high voltage circuit breaker often fails to interrupt the short circuit current under the Open-CloseOpen operation condition. In this study, analysis of arc extinction characteristics under the Open-CloseOpen operation for maximum arcing time has been conducted for the self-blast type high voltage circuit breaker. Arc extinction phenomena were analyzed by simulation that was developed based on computational fluid dynamics. Arc simulations for high voltage circuit breaker use compressible gas dynamic equations(e.g. Navier-Stokes equations) including Ohmic input, Lorentz force and radiation transport. Relevant Maxwell’s equations are included for the calculation of electromagnetic fields. The simulation results show that the arc extinction performance of the Open-CloseOpen operation is severely affected by the conditions of remaining thermal gas in the thermal expansion chamber after the first Open operation.
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송태헌(Tae-hun Song),조영만(Young-Maan Cho),고광철(Kwang-Cheol Ko) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.4
For protecting loads from the over-current, the Molded Case Circuit Breaker (MCCB) is one of the most widely used devices in low power system. In the process of the over-current interruption, hot-gas is generated in the inside of the contact system in the MCCB. The hot-gas and the structure of arc quenching unit makes the Dielectric Recovery Voltage (DRV) decreased under the Recovery Voltage(RV) of system. The DRV is the dielectric recovery strength between electrodes. The RV is the recovery voltage applied from power supply. When the DRV is reduced below the RV, the re-ignition occurs and leads to interruption failure. To optimize the structure of MCCB, it is necessary to analyze the dielectric recovery characteristics affected by design parameters. In this paper, the dielectric recovery characteristics according to design parameters of the MCCB is investigated. It can be analyzed by measuring the DRV between electrodes of arc quenching unit. To find out the effect of design parameters on the dielectric recovery voltage, we implements experiments which change conditions of the grids and vent of MCCB. Consequently, the remained hot-gas plays an important role in the dielectric recovery strength and the fast emission of the hot-gas is the key to increase the dielectric recovery strength in the initial period. Also, the grids eliminates the hot-gas through cooling and adsorption.
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저압 배선용차단기 절연회복특성 파악을 위한 절연회복전압 측정기법 연구
송태헌(Tae-Hun Song),조영만(Young-Maan Cho),고광철(Kwang-Cheol Ko) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.8
Molded Circucit Breaker(MCCB) is a most widely used device to protect loads from the over-current in low power level distribution system. When the MCCB interrupts the over-current, the arc discharge occurred between fixed contact and moving contact to create hot gas. By the Lorentz force due to arc current, the occurred arc is bent to the grids. The grids extend and cool and divide it for arc extinguish. In the majority cases, the MCCB protects loads by interrupting the over-current successfully but in some cases the re-ignition is occurred by hot-gas created during process of interruption. The re-ignition arises when the recovery voltage(RV) is more higher than the recovery strength between contacts and it leads to interruption fault. Therefore to find out the dielectric recovery characteristics of protecting device has a great importance for preventing interruption fault. In this paper, we studies measurement method of the dielectric recovery characteristics considering inherent attribute of the MCCB. To measure the dielectric recovery characteristic of MCCB, we makes an experiment circuit for applying the over-current and the randomly recovery voltage. The measurement methode to find out the dielectric recovery voltage of the MCCB was established and the result was based on experiment results.
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