• Title/Summary/Keyword: Emergency generator

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Study on Transient Improvement through Governor Control under Asynchronous Transition of CTTS (CTTS의 비동기 절체 시 조속기 제어를 통한 과도 개선에 관한 연구)

  • Kang, Byoung-Wook;Chai, Hui-Seok;Han, Woon-Ki;Lim, Hyun-Sung;Kwon, Seung-Ok;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.11
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    • pp.47-52
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    • 2015
  • This paper derives the problems that occur when asynchronous transfer in case of phase, frequency, voltage between the emergency generator and the grid and proposed the countermeasure to solve this problem when the transfer switch replace ATS(Automatic Transfer Switch) with CTTS(Closed Transition Transfer Switch) for the non-interrupting switching. In order to simulate above cases, modelling was used the transient analysis program PSCAD/EMTDC. By using this, the customer installed emergency generator and the grid was implemented. We compared three cases of asynchronous transition based on the basic case and proposed improvement by controlling the governor of emergency generator.

Self-Starting Excitation System with Low-Power Permanent Magnet Generator

  • Cho, Chong Hyun;Lee, Dong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2268-2275
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    • 2018
  • This paper presents a high-efficiency low-power permanent magnet (PM) generator for the power supply of the generator exciter. In the conventional generator system, the power for the exciter is fed by the generator output power or an emergency battery for the starting. The proposed low-power PM generator can generate the proper power and voltage to excite the exciter field winding. According to the starting of the generator, the designed PM generator can supply the constant voltage to the Automatic Voltage Regulator (AVR), then it can be used to control of exciter field current for the generator. Because of the designed PM generator which is placed inside the conventional generator system, the emergency battery and Potential Transducer(PT) for AVR can be removed. Thus, the total efficiency can be improved. The proposed generator system is tested in the practical system. And the efficiency characteristic is analyzed.

A Development of Energency Power Automatic Transfer Module in home (가정용 비상 전원 절체 모듈 개발)

  • Joo, Nam-Kyu;Kim, Kwan-Yuong;Kim, Nam-Ho;Lee, Jong-Myong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.05a
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    • pp.321-323
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    • 2009
  • When power failure occurs at multi-housing complex, auxiliary generator or emergency generator starts to provide power to households. This power is connected to emergency power ELB(Earth Leakage Breaker) at home distribution panel board and supplies power only for emergency light in living room but for heating system, refrigerator and other inevitable apparatuses that are in need of uninterruptible power. Since those domestic appliance are fed from common power line, they are inoperable during power failure. Our research is to resolve this problem by developing compatible relay-drive common/emergency-power ATS (automatic transfer switch) for home distribution panel board. In case of power failure, it transfers automatically and commences to provide power from emergency generator. Through this, Consumers can reach satisfaction where common power loads operate without any problem under both ordinary and power failure condition.

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A Study on the Seismic Isolated Bed System Considering the Seismic Stability of an Emergency Diesel Generator (내진안정성을 고려한 비상디젤발전기의 방진베드시스템에 관한 연구)

  • Ha, Neung-Gyo;Kim, Chae-Sil
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.6_3
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    • pp.1155-1163
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    • 2022
  • This study proposes a technology to ensure the seismic stability of a 1,000 kW diesel engine-type emergency generator by applying a seismic isolated bed system. The technology allows the static analysis by making the first natural frequency of the installed entire emergency generator larger than the earthquake cutoff frequency of 33 Hz. First a three dimensional model for the generator was made with simplification for mode analysis. A new bed system with springs, shock absorbers, stoppers was then devised. Next, The mode analysis for the finite element model equipped by the bed system was performed. the 1st natural frequency above 33 Hz, the seismic safety cutoff frequency, was calculated to be 152.92 Hz. Finally, based on the seismic stability theory, the von-Mises equivalent stresses derived by structural analysis under the Upset and Faulted conditions were 0.01603 Mpa, and 32.06 Mpa, respectively. so seismic stability was confirmed.

Simulation Analysis and Development of Matlab/Simulink Model for Stand-alone Operation of Emergency Diesel Synchronous Generator-based Hybrid Energy System (비상용 디젤동기발전시스템기반 독립운전 하이브리드에너지시스템 모델 설정 및 시뮬레이션 분석에 관한 연구)

  • Hong, Won-Pyo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.1
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    • pp.70-79
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    • 2015
  • In this paper, enhanced stand-alone operation and development of Matlab/Simulink model of emergency diesel based hybrid energy system is presented. Simulations based on the remote community or islands were performed for PV-diesel-battery hybrid system. Modeling of PV-diesel-battery integrated system is done to perform under the solar radiation and load conditions on Matlab/Simulink platform. The models of diesel generator unit, battery energy storage system, PV and frequency-power control are developed and simulation studies have been carried out under various conditions using Matlab/Simulink and SimPowerSystem. It is demonstrated that the proposed system can provide reliable and good quality power to the customers in diesel synchronous generator-based hybrid energy systems.

Analysis of the Electromagnetic Clutch for Emergency Power Generator (비상발전기용 전자클러치의 자계해석)

  • Jeon, Mun-Ho;Kim, Chang-Eob
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.4
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    • pp.111-116
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    • 2011
  • This paper deals with the electromagnetic clutch which stop the generator at emergency by using the engine power of generator. The electromagnetic field was analyzed using Flux-2d program with different conditions : voltage, air gap, coil locations. As a result, the maximum magnetic flux density of electromagnetic clutch occurred between the coil and wheel : 0.27[T], 0.41[T] at 12[V], 24[V]. The maximum flux density was at the center location of the coil.

A Study on the Development of EDG Engine Condition Diagnosis Program in Power Plant (발전용 비상디젤발전기 엔진 상태진단 프로그램 개발 연구)

  • Lee, Sang-Guk;Kim, Dae-Woong
    • Journal of Power System Engineering
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    • v.19 no.5
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    • pp.67-72
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    • 2015
  • The reliable operation of onsite emergency diesel generator(EDG) should be ensured by a conditioning monitoring system designed to maintain, monitor and forecast the reliability level of diesel generator. The purpose of this paper is to develop condition diagnosis algorithm(logic) and analysis program of engine for the accurate diagnosis in actual condition of emergency diesel generator engine. As a result of this study, we confirmed that developed engine condition diagnosis algorithm and analysis program could be efficiently applied for actual EDG engine in nuclear power plant.

A Study on the Analysis of Failures Related to Emergency Diesel Generators in Overseas Nuclear Power Plants (원전용 비상디젤발전기 국외 손상사례 분석에 관한 연구)

  • Chang, Jung-Hwan;Kim, Jin-Sung;Chung, Hae-Dong;Cho, Kwon-Hae
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.5 no.1
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    • pp.32-37
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    • 2009
  • The emergency diesel generator (EDG) in a nuclear power plant (NPP) shall start within 10 secondss and supply electrical power to engineered safety features within one minute and less if a loss of offsite power (LOOP), A design-basis event, or their combination occur. Each NPP has an EDG set consisting of two diesel generators for redundancy. In addition to the EDG set, an alternate Alternating Current Diesel Generator (AAC DG) is installed and shared by several units to cope with a station black out (SBO), i.e., loss of the offsite power concurrent with reactor trip and unavailability of the EDG set. The objective of this study is to analyze the failure data of emergency diesel generators reported in overseas nuclear power plants.

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A Case Study on Noise Effect Assessment and Countermeasure by Emergency Generators installed in an Exterior and interior Architecture (건축물 내외부에 설치된 비상용 발전기 소음영향 평가 및 대책방안 사례연구)

  • Yun, Dae-Jin;Choi, Jae-Sung;Kim, Chang-Yeol;Hong, Chang-Wan;Kim, Han-Jun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.88-93
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    • 2012
  • Recently data centers are being established or expanded according to IT industry development. A data center must be to install emergency generator. In case of the data center located the densely populated urban area, the operating noise of an emergency generator can be the cause of complains. In this case, in order to establish an effective and economical measure and quantitative and thorough review is needed by noise & vibration specialists. To achieve this, in this study, it is suggested noise reduction measure using noise measurement data and 3D noise analysis method.

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A Study on the Implementation and Modeling of 20kW Scale ESS Load Test Device for Emergency Generator (소방용 비상발전기의 현장부하시험을 위한 20 kW급 ESS 부하시험장치 모델링과 구현에 관한 연구)

  • Choi, Seung-Kyou;Lee, Hu-Dong;Choi, Sung-Sik;Ferreira, Marito;Rho, Dae-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.9
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    • pp.541-550
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    • 2019
  • An emergency generator is key equipment for fire-fighting to supply power to fire-fighting facilities, which protect property and people in cases of fire accidents. A rated load test for emergency generators must be carried out by connecting an emergency load to the generator in accordance with related regulations. However, a no-load test has been performed for emergency generators in general since serious problems can occur when the main power is cut off, including the damage of customer devices and shut down of critical loads. Therefore, this paper proposes a load test method for an emergency generator using energy storage system (ESS) without the interruption of main power. The emergency power system was also modeled based on PSCAD/EMTDC software, and a 200-kW scale ESS load test device was implemented. The simulation and test results show that the load test method is useful and practical for an emergency power supply system.