• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.365-367
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• 2005

This paper proposes a hardware of IED for power transformer protection that is well constructed using DSP chip and MPU chip. The performance of the adaptive relaying algorithm, by real-time testing in a prototype of it, has been verified. And test results indicate the proposed relaying of the IED was proven to be faster and more reliable.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.301-303
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• 2005

IEC 61850 is an international standard for substation communications. It introduces function that provide a substation with autonomous behavior of IEDs. The paper presents the model which is for change and modification of the IED setting values with analyzing IEC 61850.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.27 no.12
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• pp.74-80
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• 2013

Generator faults does not happen more often than the transmission and substation facility faults. However, impacts on the power system by generator faults are very large. In order to minimize the impact of generator faults, generator protection and control system with high reliability is required. Most of the generator relay in generator protection and control system of large power plant of Korea is operated by imports from abroad. Accordingly, in order to accumulate source technology and increase the import substitution effect, localization of multi-function generator protection IED is being developed. This paper deals with the implementation of a multi-function prototype IED H/W, which can be command and data exchange through communication for measuring, monitoring, protection and control. And the IED specification, various relay elements, measurement elements, communication functions, module function, and test system for the prototype IED H/W are described.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.266-267
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• 2011

IEC 61850 기반의 변전자동화를 운영하는데 있어 보호기능과 통신을 별개로 여길 수가 없으며 기존에 장치 개별로 동작하던 것이 이더넷 통신이란 틀 안에서 시스템으로 유기적으로 연결되어 동작하기 때문에 IEC 61850 통신과 기능을 시스템 기반에서 수행할 수 있는 새로운 방안이 요구되어진다. 본 논문은 변전자동화시스템의 종합적인 성능검증을 목적으로 개발된 시험자동화시스템의 실제 적용가능성을 검증하고, 변전자동화 시스템의 22.9kV 배전선로 보호 및 제어의 기능을 수행하는 IED를 대상으로 시험자동화시스템에 적용한 연구 내용을 다루고자한다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.131-133
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• 2008

최근 전력계통 분야에서는 IEC에서 제정한 변전소 자동화용 국제 규격 프로토콜인 IEC 61850을 적용한 시스템의 도입 및 적용이 활발하게 이루어지고 있다. 이러한 추세에 맞추어 변전소 내 많은 전력기기들의 IEC 61850 프로토콜을 탑재가 요구되고 있으며, 본 연구에서는 변전소 내 조상설비 중 IEC 61850 프로토콜을 적용한 분로리액터 보호용 IED의 설계, 제작, 시험을 통하여 변전자동화 가능성을 확인하였다.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.55 no.1
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• pp.6-12
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• 2006

A popular method used by primary protection for power transformer is current ratio differential relaying (RDR) with 2nd harmonic restraints. In modern power transformer due to the use of low-loss amorphous material, the 2nd harmonic component during inrush is significantly reduced. The higher the capacitance of the high voltage status and underground distribution, the more the differential current includes the 2nd harmonic component during internal fault. Thus the conventional method may not operate properly. This paper proposes an advanced relaying algorithm and the prototype IED hardware design and it's real-time experimental results. To evaluate performance of the proposed algorithm, the study is well constructed power system model including power transformer utilizing the EMTP software and the testing is made through simulation of various cases. The proposed relaying that is well constructed using DSP chip and microprocessor etc. has been developed and the prototype IED has been verified through on-line testing. The results show that an advanced relaying based prototype IED never mis-operated and correctly identified all the faults and that inrushes that are applied.

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.5
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• pp.381-388
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• 2003

In this paper, the IED(Intelligent Electronic Devices) with the consideration of harmonic problems is discussed, With significant development of power electronics technology, the proliferation of a nonlinear load has more deteriorated power quality, As continuous harmonic current makes for a shortening lifetime, overheat and abnormal operation, it should be considered to improve these problems. However, the conventional digital protective relay which eliminates harmonic elements with orthogonal filter has a defect on actually implementation. The prototype IED is constructed with Digital Signal Processor(TMS320C32) and Complex Programmable Logic Device. According to the experiment and simulation results, it is proved that the proposed system has good performance of measuring harmonic factors and protecting electrical equipment.

• Journal of IKEEE
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• v.22 no.4
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• pp.1036-1043
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• 2018

This paper presented future power system protection technologies through the HW/SW integration platform with IEC 61850 and IEEE c37.238 standards. To determine the implementation performance of the integrated platform, an example of EVM (Evaluation Module) was constructed to satisfy the standards. The platform has been identified as a future power system integrated IED(Intelligent Electronic Device) HW/SW technology that meets the level of error required by the time sync standard and the level of delay required by protecting the power system.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.264-265
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• 2011

현재까지 중전기기 분야의 전력기기들은 주로 단위기기들의 성능이 시장경쟁력을 좌우하였으며, 대용량화 및 경제적 설계 등이 대표적인 성능요소로 평가되었으나, 앞으로는 전력감시.제어 및 보호의 효율화를 위한 시스템화의 관점이 많은 비중을 차지하게 될 것이며 이에 따라 2차적인 기능적 측면들이 강조되고, 이러한 기능적 성능들이 시장경쟁력을 크게 좌우하게 될 것으로 사료된다. 따라서 IED의 전기 접점을 통해 이루어지던 예전의 시험방식에서 네트워크를 통한 시스템 차원의 시험방식으로 변화가 요구되고 있다. 본 논문에서는 배전선로 IED를 시스템적으로 시험할 수 있도록 UML을 이용한 성능 시험절차서의 구현 내용을 다루고자 한다.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.70-72
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• 2005

변전소 내 IED의 신뢰도는 전력계통 운용과 보호에 매우 중요한 주제가 되었다. 또한, 서로 다른 회사에서 제작된 다른 기술을 이용한 IED들을 사용할 경우 신뢰도 유지에 힘든 것이 사실이다. 이를 해결하기 위하여 변전소 자동화의 구조 및 충신을 정의한 IEC61850이 제안되었다. 본 논문에서는 IEC61850기반의 변전소 자동화 시스템을 위한 새로운 신뢰도 향상 기법에 대해 제안한다 제안하는 방법은 패턴 검사를 통해 IED의 고장을 검출하고, 백업 IED와 소프트웨어 이동을 이용하여 결함을 극복하는 것이다.