• 제목/요약/키워드: Load Bank

검색결과 109건 처리시간 0.032초

Design of Capacitor Load Bank for Capacitive Current Switching Tests (진상소전류시험용 Capacitor Load Bank 설계)

  • Roh, Chang-Il;La, Dae-Ryeol;Kim, Sun-Koo;Jung, Heung-Soo;Kim, Won-Man;Lee, Dong-Jun
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.106-108
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    • 2002
  • Capacitive current switching test for circuit breaker and load breaker switch requires special attention because, after current interruption, the capacitive load contains an electrical charge and can cause dielectric restrike and re-ignition of the switching devices. therefore dielectric strength of capacitor load bank shall be able to withstand 4Vt (Vt : test voltage) and charging voltage discharged within 1 min. In this paper presents both characteristic of capacitive current switching tests and design of capacitor load bank.

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Planning for Construction and Expanding of Distribution Substation Considering Contingency (상정사고를 고려한 배전용 변전소 신,증설 계획 수립)

  • Choi, Sang-Bong;Kim, Dae-Kyeong;Jeong, Seong-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • 제50권7호
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    • pp.303-308
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    • 2001
  • This paper presents algorithm to plan construction and expanding of substation considering contingency accidents by proposing utilization factor according to configuration of substation bank system. In this paper, firstly, proper sphere of supply area by each district which could be standardized with respect to its supply capacity is established under assumption of long term load forecasting. Secondly, goal of utilization ratio based on configuration of substation bank was set to keep reliability by remaining sound bank when it happen to one bank accidents. Finally, it is set up for optimal construction and expanding of substation considering economy and reliability simultaneously about substation to exceed these ratio. To verify proposed algorithm, at first, after adopting a part of Kangnam area in Seoul as area for testing, it is divided into several regions for this area according to power branches of power utility. Secondly, by deriving correlation factor between load demand and economic indicators in these region respectively, the regional load forecasting was performed with economic growth and city plan scenario. Finally, based on the predicted load demand by region and land use data which is identified from air-photographic, the load demand by district was predicted. Also, planning for substation considering contingency is formulated to expand taking into account computing utilization factor which is based on configuration of substation bank respectively.

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Component-Based Load Modeling Updated by Hybrid Technique (하이브리드 방식에 의한 미시적 부하모델링)

  • 지평식
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • 제52권3호
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    • pp.179-182
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    • 2003
  • Component-based method for load model not only should include the performances of the load components, but also should take into consideration the core losses of transformers, the line losses and the capacitor banks. Especially, capacitor bank affects the accuracy of reactive load model in load modeling. But it is difficult to identify actual reactive powers of capacitor banks in power system for load modeling. This research improves the component-based modeling method including uncertain capacitor bank. The proposed method is hybrid technique, which adds the measurement-based method to the existing component-based method for reliable information of capacitor band. The results of case studies were presented to verify the validity of the proposed method.

A Study on Economic Evaluations of ESS Load Test Device for Field Load Test in Fire-fighting Emergency Generator Systems (소방용 비상발전기의 현장부하시험을 위한 ESS 부하시험장치의 경제성평가에 관한 연구)

  • Choi, Seung-Kyou
    • Journal of the Korea Academia-Industrial cooperation Society
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    • 제21권9호
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    • pp.380-386
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    • 2020
  • The ESS load test device (ELTD) can store and exchange electrical energy during the load test of an emergency generator. On the other hand, it is difficult to commercialize ELTDs based on Li-ion batteries because of the high initial cost, which is higher than a load bank test. If the trade of electrical energy stored in ELTD during the test of an emergency generator is considered, it may be possible to commercialize the ELTD. Therefore, this paper proposes an economic model of ELTD composed of the costs and benefits by considering electrical energy trade to perform accurately economic evaluations of an ELTD. From the simulation results of the economic evaluations of an ELTD and the load bank method, it was found that the commercialization of ELTD is possible when the trade in electrical energy in ELTDs is considered.

Development of the Crowbar System Using a Vacuum Switch (진공 스위치를 이용한 Crowbar 시스템의 개발)

  • 이태호;허창수;이홍식
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • 제51권12호
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    • pp.584-590
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    • 2002
  • Crowbar system is usually applied to a pulsed power system in which a capacitor bank is discharged into a load. This provides a free wheeling path for the load current and prevents the capacitor from recharging due to a reverse voltage. Usually diodes have been used as a crowbar switch, but it is not a practical system because the cost of the diodes goes up enormously with increasing the system voltage and current. This paper presents a novel protection scheme of a charging and discharging system of a 300 kJ capacitor bank using a low-cost crowbar system which consists of a crowbar switch and resistors. Triggered vacuum switch(TVS) was used for a crowbar switch, and Rogowski coil was used to determine a trigger time of TVS. When this crowbar system is applied to our pulsed power system which consists of capacitor bank($123muF$), inductor() for forming a pulse, load resistor$(100 m\Omega)$, and a closing switch, instantaneous reversal voltage of capacitor bank could be limited less than 1.8 ㎸ until capacitor bank was charred to 17 ㎸.

Advanced Load Follow Operation Mode for Korean Standardized Nuclear Power Plants (한국 표준 원전의 부하추종을 위한 운전 기법)

  • Park, Jung-In;Oh, Soo-Youl;Song, In-Ho;Hah, Yung-Joon;Kuh, Jung-Eui;Lee, Un-Chul
    • Nuclear Engineering and Technology
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    • 제24권2호
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    • pp.183-192
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    • 1992
  • An advanced load-follow operation mode, Mode K, is presented for the Korean Standardized Nuclear Power Plants. The Mode K utilizes a heavy worth bank dedicated to axial shape control independent of the existing regulating banks. In Mode K, the heavy bank provides a wide range of axial shape control and a monotonic relationship between its motion and the axial shape change, which makes it easy to automate axial shape control. The achievement of full automatic reactor power control both for the reactivity and power shape would reduce the burden due to load-follow operation on the operator. Also, it can accommodate the frequen-cy control, which requires the plant to respond to the unexpected demand. The Mode K design concepts were tested using simulation responses of Yonggwang Units 3&4, the reference plants for the Korean Standardized Nuclear Power Plants. The results illustrate that the Mode K is an adequate operation mode to provide practical load-follow capabilities for the Korean Standardized Nuclear Power Plants.

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Planning for Reasonable Construction and Expanding of Distribution Substation By Load Forecasting (부하예측에 의한 합리적인 배전용 변전소 증설계획 수립)

  • Choi, Sang-Bong;Kim, Dae-Kyeong;Jeong, Seong-Hwan;Bae, Jeong-Hyo;Ha, Tae-Hyun;Lee, Hyun-Goo;Kim, Ho-Yong
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2000년도 추계학술대회 논문집 학회본부 A
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    • pp.92-94
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    • 2000
  • This paper presents algorithm to plan construction and expanding of substation considering contingency accidents by proposing utilization factor according to configuration of substation bank system. In this paper, above all, proper sphere of supply area by each district which could be standardized with respect to its supply capacity is established under assumption of long term load forecasting which was made by district respectively, and then goal of utilization ratio based on configuration of substation bank was set to keep reliability by remaining sound bank when it happen to one bank accidents. Finally it is set up for optimal construction and expanding of substation considering economy and reliability simultaneously about substation to exceed these ratio.

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The Coordinate Control Method of LTC Transformer and Capacitor Banks at Distribution Substation

  • Choi, Joon-Ho;Ahn, Seon-Ju;Nam, Hae-Kon;Kim, Jae-Chul;Moon, Seung-Il;Jung, Won-Wook;Song, Il-Keun
    • Journal of Electrical Engineering and Technology
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    • 제7권3호
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    • pp.320-329
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    • 2012
  • The Load Tap Changing (LTC) transformer and Shunt Capacitor (SC) bank are major devices for voltage and reactive power control in a distribution substation. Thus, the coordination operation of a LTC transformer and a SC bank is required to achieve better voltage and reactive power compensation at a distribution substation in the same time. This paper proposes coordinate control method of LTC transformer and SC bank to achieve better voltage and reactive power compensation and operation times of these two devices in the same time. The mathematical formulations of the proposed coordinate control method are introduced. Sample case studies are shown to verify the effectiveness of the proposed coordinate control method.

A study on the electric power recovery in generator load test (부하 시험 발전기 전력회수에 관한 연구)

  • Lee, Myoungho
    • Journal of Advanced Marine Engineering and Technology
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    • 제38권4호
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    • pp.403-408
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    • 2014
  • Lots of electric power has been wasted through the load bank usually in the container boxes during the generator load test of the ship and offshore plant in the new ship building. Therefore in this research, the quantity of wasted electric power through generator load test under construction was investigated on big shipbuilding yard and quantity of electric power that can be recovered is analyzed when produced electric power during the generator load test is connected to KEPCO Grid, according to laboratory's experiment result where recovers electric power produced from small generator connected to KEPCO Grid.

A New Low Cost Hybrid Power Filter for Thyristor-Controlled Rectifier Load (싸이리스터 정류부하를 위한 새로운 저원가 복합형 전력필터)

  • 한성룡;김수근;석원엽;조정구;송의호;전희종
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • 제53권1호
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    • pp.24-29
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    • 2004
  • A new low cost hybrid active filter for thyristor-controlled rectifier load is presented to overcome the high cost problem of the active or the other hybrid active filters. The proposed hybrid active filter which consists of tuned (5th and 7th harmonics) LC passive filters, power factor improvement(PFI) capacitor bank, and active filter compensates power factor as well as harmonic currents. Since most of harmonic currents are filtered by the passive filter and most of reactive power is compensated by the PFI capacitor bank, the power rating of active filter can be minimized, resulting in cost minimization of the proposed hybrid active filter. A 300kVA hybrid active filter system is implemented and tested using 1MVA thyristor rectifier load to verify the operation and performance.