• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.1
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• pp.92-99
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• 2002

Transient in an electric distribution system are mainly generated by switching. This paper presents analysis of switching surge and means of limiting the voltage magnification transient for high voltage power systems by using the EDSA's EMTAP software package. One means of limiting the voltage magnification transient is to convert the end-user power factor contraction capacitor banks to harmonics filters. An inductance in series with the capacitor bank was used to decrease the transient voltage at the customer bus to acceptable levels. And also simulation results used the EDSA harmonics analysis program show the effect of harmonics reduction.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.3
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• pp.725-734
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• 2016

SCADA(Supervisory Control and Data Acquisition) system is widely used for remote monitoring and control throughout the domestic industry. Due to a recent breach of security on SCADA systems, such as Stuxnet, the need of correctly established secure certification of a control system is growing. Currently, EDSA-CRT (Embedded Device Security Assurance-Communication Robustness Test), which tests the ability to provide core services properly in a normal/abnormal network protocol, is only focused on the testing of IP-based protocols such as IP, ARP, TCP, etc. Thus, in this paper, we propose test requirements for DNP3 protocol based on EDSA-CRT. Our analysis show that the specific test cases provide plentiful evidences that DNP3 should follow based on its functional requirements. As a result, we propose 33 specific test case for DNP3 protocol.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2002.11a
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• pp.319-324
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• 2002

This paper describes analysis of power quality in distribute network system. EDSA is used for simulations to the teal model system. Harmonic load flow, harmonic frequency scan studies, distortion levels, and filter design method. Through this paper, minimized injected harmonic by computating the capacitor of optimal filter satisfied with IEEE Std-519 applying to distribute system are analysed through detailed simulation.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.259-262
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• 2016

최근 중요 인프라 업계에서 주로 다뤄지는 제어시스템을 표적으로 한 사이버 공격으로 Stuxnet에 이어 Havex RAT, BlackEnergy2 라고 하는 멀웨어(Malware)를 이용한 사건이 많이 증가하고 있다. 제어시스템의 새로운 공격 방법에 대한 대책으로 시스템 입구와 내부조직에 대한 대책을 강화하기 위한 필요성이 요구되어 왔지만 그러한 대책은 한정되어 있다. 본 논문에서는 보안대책에 필요한 인증 취득에 있어서 기준이 되는 국제 표준인 ISASecure(R)EDSA 인증제도에 착목했다. 인증평가는 요구요건이 중복되는 불필요한 인증평가 작업을 최소화 하는 것으로 인증 취득 시 발생되는 코스트를 절감할 수 있으며 기존의 정보 보안 관리체계(lSMS)의 인증을 취득하고 있는 기업이나 조직이면 제어시스템의 인증 기준으로 추가된 차분 요건만으로 취득이 가능 할 수 있을 것으로 상정된다. 이러한 제어시스템의 보안을 구현하기 위해 IACS(Industrial Automation and Control System)에서 표준화로 제정한 IEC62443 시리즈를 참조하여 세계각국에서 사용되는 제어시스템을 대상으로 인증(EDSA) 요구사항의 차분을 도출하는 수법을 제안하고자 한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.8
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• pp.26-32
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• 2009

Grounding insures a reference potential point for electric devices and also provides a law resistance path for fault or transient currents in the earth. The ground impedance as a function of frequency is necessary for determining its performance since fault or transient currents could contain a wide range of frequencies. A copper rod electrode is the most commonly used grounding electrode in electric distribution systems. In this paper, the grounding impedance of copper rods has been measured in frequency raging from 60[Hz] up to 100 [kHz] and an equivalent model of the grounding impedance is identified from the measured values. The grounding impedance under study when a typical lightning surge is injected into the grounding system was simulated numerically and graphically through the use of the EDSA software program.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.1
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• pp.87-93
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• 2005

In this paper, we perform the harmonic filter design for Incheon international airport, especially passenger terminal based on the results of measurement and analysis. Also, we show the waveform of machines which produce harmonics as a harmonic source. For harmonic filter design, we propose the APF(Active Power Filter) and ZSF(Zero Sequence Filter) design. Also, we simulate the filter effects using EDSA package. The results show the effectiveness of the method.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.3
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• pp.81-87
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• 2000

The increasing use of non-linear loads such as power electronics draw highly distorted currents from the utility system. High harmonics currents and voltages will cause equipment damage and disturb the plant operation. The common solution to harmonics problem is to use harmonics filters. In this paper simulation results used the EDSA harmonics analysis program verifying the effects of the single-tuned filter for harmonic elimination are presented.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.3
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• pp.7-14
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• 2002

The economic dispatch is one of the major concerns in case of buying and selling generated powers between electric powers companies. This paper describes the power system security the optimal power flow, and the security-constrained economic dispatch and shows the EDSA\`s active optimal power flow software package is well suited through a simple case study.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.3
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• pp.61-66
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• 2002

Electric power distribution networks are prime examples of systems where a very high degree of reliability is expected. Reliability is the probability of a device or system performing its function adequately for the period of time intended and intented operating conditions intented. This paper shows that a better meshed distribution configuration over the case study of radial configuration distribution system was selected by comparing the indices obtained from EDSA\`s reliability worth assessment of distribution systems program.

• 환경사랑
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• s.61
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• pp.12-13
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• 2011

지난 6월 15 ~ 16 양일간 필리핀 마닐라 EDSA 샹그리라호텔에서 개최된 '2011 AMEPS 총회' 및 필리핀 PS포장위원회(PPCP)가 주최한 '국제PS포룸'에서 발표된 자료들을 회의에 참석했던 협회 최주섭 부회장이 정리했다.