• 한국압력기기공학회 논문집
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• 제5권1호
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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.

• 전기학회논문지
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• 제67권11호
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• pp.1517-1522
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• 2018

This paper describes the improvement of the arithmetic for emergency generator capacity. This formula which calculates emergency generator is dependent on the Korean Design Standard of building electrical equipment issued by the Ministry of Land, Infrastructure and Transport, and the technical data related to the generator. when appling the formula, the capacity of the generator is insufficient at the starting conditions of the load facility. In case of emergency, the generator is not operated normally. $PG_2$ of the formula ($PG_1$, $PG_2$, $PG_3$) applied in determining the capacity of the emergency generator is selected by calculating the capacity of the generator based on only biggest one motor among the load equipment and $PG_3$ may not be able to start the generator normally in case of emergency because there is an error such that the power factor is applied at the last start of the motor having the maximum capacity of the load. We analyze the problem of capacity calculation of emergency generators used for general purposes. As a consequence, the improved formulas have been presented for safety of electrical installation.

• 조명전기설비학회논문지
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• 제29권6호
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• pp.58-62
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• 2015

When an emergency generator is running, it supplies the power for critical loads. Generator protection requires the consideration of many abnormal conditions that may occur with generators include overvoltages and ground faults. Modern day power systems create harmonics within the electrical network that can have an impact upon the associated protective system. This paper focuses on the analysing of the cause and development of a solution for the malfunction of induction disc type overcurrent ground relay by generation of harmonics during emergency generator operation.

• 조명전기설비학회논문지
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• 제29권1호
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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.

• 조명전기설비학회논문지
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• 제25권4호
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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.

• 한국산학기술학회논문지
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• 제20권9호
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• pp.541-550
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• 2019

소방용 비상발전기는 화재 시 인명과 재산을 보호하는 소방 시설에 전원을 공급하는 중요한 설비이다. 이러한 중요성에 따라 관련 법규에서는 의무적으로 비상발전기에 비상용 부하를 연결하여 시험하도록 규정하고 있다. 그러나 실 계통에서는 비상전원계통의 부하운전 시험을 위해 상용 전원을 차단하는 경우 저압기기의 파손, 병원과 같은 중요시설의 응급부하 정지 등 심각한 문제점이 발생할 수 있어, 무부하로 비상발전기를 형식적으로 시험하고 있는 실정이다. 따라서, 본 논문에서는 상기의 문제점을 개선하기 위하여, 상용 전원의 차단 없이 비상발전기에 전기저장장치를 연계하여, 비상용부하의 동작특성과 동일하게 ESS가 충전동작을 수행함으로서 비상발전기의 성능 및 상태를 시험할 수 있는 방안을 제시한다. 또한, 배전계통 상용 해석 프로그램인 PSCAD/EMTDC를 이용하여, 비상발전기, 비상용부하, ESS 부하시험장치로 구성된 비상전원계통의 모델링을 제시하고, 20kW급 ESS 부하시험장치를 구현하여, 이를 바탕으로 다양한 시나리오에 따른 시뮬레이션과 시험을 수행하여 본 논문에서 제안한 ESS 부하시험 장치와 모델링의 유용성을 확인한다.

• 한국화재소방학회논문지
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• 제26권3호
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• pp.29-34
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• 2012

본 논문에서는 소방전원 및 소방전원 부족시 용량 보완을 위한 인터록 시스템의 한계점 등을 분석하고 소방전원 보존형 발전기(RFP)의 작동방법 등을 제시하여 화재와 같은 상황에 효율적으로 대응할 수 있는 방법을 제시하는데 있다. 소방전원보존형 발전기에서 일괄제어방식은 발전기에 과부하가 걸리면 소방전원보존용 제어기에서 신호를 발신하여 소방부하는 남겨두고 비상부하용 주차단기를 일괄 차단하고, 발전기가 마지막까지 소방부하에 전원이 공급되도록 한 시스템이다. 순차제어방식은 과부하가 걸리면 소방전원보존용 제어기에서 1차 신호를 발신하여 설정된 비상부하의 1단계 부하를 차단한다. 그리고 지속적인 감시 상태에서 소방부하가 증가하여 발전기가 다시 과부하가 걸리면 제어기에서 2차 신호가 발신하여 비상부하의 2단계 부하를 차단하는 시스템이며 각각의 작동 상태를 표시하는 표시장치를 가진다.

• 전기학회논문지
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• 제59권8호
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• pp.1449-1455
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• 2010

The excitation control system of an emergency diesel generator is classified as a kind of safety-related system. Compared with other control systems in a power plant, this system is required to be more reliable and have better performance. In this paper, the digital multi-redundant excitation system for a diesel generator was proposed. The signal processing system of the proposed system makes high speed signal processing and arithmetic in excitation control possible. The improved soft start algorithm and multiple PI parameters adaptation considering the diesel generator characteristics were implemented in the proposed system. The developed system was applied to a nuclear power plant successfully.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 F
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• pp.2801-2803
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• 1999

An unified controller for emergency generator is presented to control AVR and Governor and l00kVA power conditioner. This controller is operated to compensate current harmonics and asymmetries caused by nonlinear load and unbalance loads. The power conditioner shapes the source current sinusoidal in phase with source voltage and allows the generator to maximum power even to the single phase load. Also this power conditioner allows that three phase generator synchronizes with single phase main source and load sharing. An l00kVA generator system was built and the unified controller is realized with DSP(TMS320C32PCMA). Experimental results for many load conditions are presented to verify the performance of the unified controller.

• 한국안전학회지
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• 제27권3호
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• pp.49-56
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• 2012

The purpose of this paper is to present a model for operating an emergency power system(EPS) that can secure a sufficient power supply used in case of a fire by analyzing the status of power supplies for emergency and firefighting operations. Investigations on the one of the causes of the operational failure of firefighting systems show evidence of EPS. Generally, when power to a building is interrupted, EPS supplies the emergency load(excepted firefighting load) first. When a power outage and a fire occur simultaneously, the EPS must be able to supply both the emergency load and the firefighting load, especially the firefighting load to the end. However, in order to save construction costs, emergency power generators in apartment, commercial, and business buildings can satisfy only one of the required loads. In cases like this, when a power outage and a fire occur simultaneously, there is a danger of firefighting equipment not operating due to insufficient power supply from the emergency generator. Therefore, an EPS must have a reserved firefighting power that can supply both the firefighting and the emergency load. Such EPS, when faced with a danger of an overload, will shut down the supply to all or part of the emergency load, thus securing a continuous power supply to the firefighting equipment. The generator power system with reserved firefighting power (RFP) will also have an indicator to show that the selective control is being used. General power generation systems for emergency load and firefighting load were found to have a demand factor of 50-60% with a lump. However, when installing an EPS, the builders must choose the higher demand factor suggested according to the official approval demand factor of the building.