• Title, Summary, Keyword: EMTP

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Modeling of Switching Surge using EMTP-RV (EMTP-RV를 이용한 개폐서지 모델링)

  • Seo, Hun-Chul;Han, Hoo-Suk;Han, Seung-U
    • Proceedings of the KIEE Conference
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    • pp.249-251
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    • 2006
  • 현재 전력계통해석은 단인 주파수의 정상 및 과도상태 해석용 페이서 개념의 해석 툴을 사용하고 있다. 이는 뇌서지, 개폐서지, TRV, 병렬회선 공진 등 비선형적 계통현상분석 시 한계를 보이게 된다. 더욱이 계통이 거대화, 복잡화 됨에 따라 비선형적 과도현상 발생 빈도가 더욱 증가하여 과도현상 해석의 필요성이 점점 증가하고 있는 실정이다. 전력계통 해석 소프트웨어 중 EMTP는 비선형적 요인에 의한 고장발생 시 원인분석 해석 기술을 제공하고 있다. EMTP-RV는 EMTP를 GUI 방식으로 재구성한 툴로서 더욱 사용하기 편한 장점을 지니고 있다. 따라서, 본 논문에서는 여러 과도현상 중 개폐서지에 대하여 EMTP-RV를 이용한 분석 기법을 나타내었다. 여러 개폐서지 발생 원인을 EMTP-RV를 이용하여 모델링 하였으며, 모의 결과를 분석하였다.

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The Development of Window Operating EMTP Package Using Matlab (매트랩을 사용한 윈도우 구동형 EMTP 패키지의 개발)

  • 이재용
    • Journal of the Korean Institute of Telematics and Electronics T
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    • v.36T no.3
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    • pp.79-84
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    • 1999
  • The existing EMTP(Electromagnetic Transients Program) is writted by FORTRAN-77, has a closed architecture and uses a large number of code lines to satisfy requirements ranging from low level data manipulation to the actual solution mathematics which eventually become diluted and almost impossible to visualize. Thus has a difficulty in the development and maintenenace of its program module. This paper proposes a new design idea suitable (or a re-development of EMTP using the MATLAB and VISUAL-C++, which presents the development of the new EMTP package is operated in the window environment. The package has the GUI(Graphic User Interface) ability, and the MATLAB computation engine for an analysis of a transient state in an electric circuit.

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Switching Overvoltage Analysis of KEPCO 765KV System by EMTP (EMTP를 이용한 한전 765KV 계통 개폐과전압 해석)

  • Shim, Eung-Bo;Kim, Jeong-Boo;Jeon, Bok-Hyeon
    • Proceedings of the KIEE Conference
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    • pp.945-948
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    • 1992
  • In this paper, switching overvoltages are analyzed for future 765kv power system using EMTP(Electro Magnetic Transient Program) and compared with TNA (Transient Network Analyzer) study results which was previously undertaken during overseas training in 1980 and 1988. The result shows the maximum of 2.10 PU at midpoint of 310Km transmission line which is higher than those of TNA study by 0.4 PU. The deviation of EMTP result from TNA is caused by limitation of nonlinear representation and also frequency dependent modeling in EMTP. Further analysis are required to get more exact switching overvoltage factors for future KEPCO 765KV system not only by EMTP but also TNA.

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A Study on control realization of FACTS equipment in Electric Railway Systems using EMTP MODELS (EMTP MODELS를 이용한 전기철도 FACTS 설비의 제어 구현 연구)

  • Oh, Min-Hyuk;Lee, Byung-Ha
    • Proceedings of the KIEE Conference
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    • pp.329-330
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    • 2006
  • The purpose of this paper is to compensate the voltage drop of the power system in the AC Electric Railway Systems. Reactive power compensation is often the most effective way to improve system voltage drop. The suitable modeling of the electric railway system should be applied to the EMTP. the dynamic characteristics of 3-Phase Induction Motor in Electric Railway Systems is considered for precise modeling. it is shown through EMTP simulation using EMTP MODELS that voltage drop can be compensated effectively by STATCOM.

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A Study on the Effects of Line Constants Models for the Overvoltage Analysis in EMTP (EMTP 선로모델이 과전압 해석결과에 미치는 영향에 관한 연구)

  • Kim, Kyung-Tak;Kwak, Joo-Sik;Kweon, Dong-Jin;Koo, Kyo-Sun;Woo, Jung-Wook
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.10
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    • pp.33-41
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    • 2010
  • There are several overvoltages by abnormal conditions in power system. We need to calculate these ovevoltages for the insulation design and the fault analysis. For these calculations, we used EMTP(Electro-magnetic Transients Program). During EMTP calculations, the accurate modelling of the equipments is very important for analysis results. In this paper, we considered the effects of the modelling condition's changes for transmission line within EMTP modelling cases of overvoltage analysis. Specially, we considered CB closing cases of 765[kV] system. So, we had changed the calculation frequencies of Line Constants, which is used for CB closing cases. In addition, we compared the calculation result and the measured result.

The Modeling of OverCurrent Relay using Dynamic Link Library (Dynamic Link Library 기법을 이용한 과전류 계전기 모델링)

  • Seong, No-Kyu;Seo, Hun-Chul;Yeo, Sang-Min;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.6
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    • pp.1065-1070
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    • 2009
  • This paper presents the new technique of modeling using Dynamic Link Library(DLL) in ElectroMagnetic Transients Program - Restructured Version(EMTP-RV) in which we have simplified the procedures of OverCurrent Relay(OCR) modeling. The DLL function is designed to allow EMTP-RV users to develop advanced program model modules and interface them directly and intimately with the EMTP-RV engine. The modeled OCR is verified by simulating the various fault cases in the distribution system. Also, the performance for the modeling of OCR using DLL is compared with that of the method using the control components of EMTP-RV and using EMTP/MODELS. The results show the validity of modeled OCR and the effectiveness of the method using DLL function.

Improvement of Detailed Fault Point Decision Using EMTP Analysis of Search Coil Method for HVDC Cables (Search Coil법의 EMTP 분석을 통한 HVDC 케이블 상세 고장지점 판정 정확도 개선)

  • Jung, Chae-Kyun;Park, Jin-Woo;Yang, Byeong-Mo;Kang, Ji-Won;Lee, Jong-Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.9
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    • pp.1656-1662
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    • 2011
  • In a previous paper, the EMTP modeling technique using search coil test is established through various transient analysis including system grounding condition and grounding resistance for HVDC submarine cables. It was also proved by comparison with real test results. Based on this EMTP modeling technique, in this paper, it will be applied for modeling of ${\pm}180kV$ real HVDC submarine system(Jeju~Haenam). This paper variously analyses the effects of fault resistance including the resistance between core and sheath, the resistance between sheath and amore and the resistance between amore and sea water through EMTP modeling of search coil method. The results can contribute to the accuracy of detailed fault point prediction of search coil test for HVDC submarine cables.

Analysis of the Overvoltages during Energizing Transmission Lines using EMTP (EMTP를 이용한 시송전 계통의 송전선로 초기 가압시 과전압 분석에 관한 연구)

  • Yeo, Sang-Min;Kim, Chul-Hwan;Lyu, Young-Sik;Joo, Haeng-Ro;Cho, Burm-Sup
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.5
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    • pp.873-878
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    • 2009
  • When the transmission lines are initially energized for power system restoration, the power system suffers the various overvoltages that can be classified as steady-state, transient, and dynamic overvoltages. For the accurate analyses of these overvoltages, many researchers utilize different simulation tools such as Power System Simulator for Engineering(PSS/E). Although PSS/E provides good solutions in steady-state and dynamic overvoltages, it is not suitable for transient overvoltages. Therefore, transient overvoltages are simulated by using Electro-Magnetic Transients Program(EMTP) developed for the analysis of transients in the power system. Recently, EMTP can be also used to simulate dynamic behavior of the system. In order to analyze the transient overvoltages with steady-state and dynamic overvoltages, the authors adopt EMTP as the simulation tool for the analysis of overvoltages. This paper presents the simulation results for the analyses of various overvoltages, and the possibility of EMTP to be used for these types of analyses.

Modeling of Transformer Inrush Current using EMTP-RV (EMTP-RV를 이용한 변압기 여자돌입전류 모델링)

  • Seo, H.C.;Yeo, S.M.;Kim, C.H.;Yoo, Y.S.;Jo, B.S.
    • Proceedings of the KIEE Conference
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    • pp.610-611
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    • 2007
  • 본 논문은 EMTP-RV를 이용하여 변압기 여자돌입전류를 모델링하는 방법을 제시하였다. 우선, 변압기 여자돌입전류의 특성을 조사하였다. 그 다음으로, EMTP-RV의 변압기의 모델링 방법을 분석하여 변압기 여자돌입전류 모델링을 위한 적절한 방법을 선택하였다. 마지막으로, 다양한 조건에 대하여 여자돌입전류를 모델링하여 그 방법의 적합성을 증명하였다.

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