• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.711-713
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• 2004

In the past time, the protection relay did only a protection function. Currently, its upgraded device i.e. IED(Intelligent Electric Device) has been designed to protect, control, and monitor the whole power system automatically. Also the device is desired to successfully measure important elements of the power system. This paper considers design method of a digital protection IED with a function of measuring various elements and a communication function. The protection IED is composed of the specific function modules that are signal process module, communication module, input/output module and main control module. A signal process module use a DSP processor for analysis of input signal. Main control module use a embedded processor, Xscale, that has an ARM Core. The communication protocol uses IEC61850 protocol that becomes standard in the future. The protection IED is able to process mass information with high-performance processor. As each function module is designed individually, the reliability of the device can be enhanced.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.58-59
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• 2006

신뢰도 향상기법(System-based Reliability Enhancement Technology : SRET)이란 시스템레벨에서 IED의 신뢰도를 개선하는 방법이다. 변전소 자동화 시스템(SAS)에서 각 IED들은 각자의 역할에 충실하여 정상적으로 동작하여야 한다. 어떠한 IED에 이상이 생겼을 경우, 변전소 내 시스템에서는 그 IED의 이상 여부를 감지하고 그에 적절한 조치가 취해져야 한다. 본 논문은 IEC61850 기반 SCL(Substation Configuration description Language)를 이용한 SAS에서 같은 역할을 하는 백업 IED를 구성하여 임의의 사고에도 시스템 동작에 아무런 영향을 미치지 않는 시스템 신뢰도 향상 기법의 구현을 설명하였다. 제안한 기법의 효율을 검증하기 위하여 실제 시뮬레이터를 사용하여 시뮬레이션을 수행하고 그 결과를 수록하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.5
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• pp.767-772
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• 2008

Korea Electric Power Research Institute in charge of the power IT project "Development of Prototype for Advanced Substation Automation System based on the Digital Control Technology", is performing the verification of performance of the substation automation system. In order to verify a system based BUS protection IED, the standardized document and procedures are required. But there is nothing to describe systematically how to verify IEC 61850 based IED in the system environment except an individual IED testing way and report. This paper presents the substation automation system based ways and procedures to verify the IED using UML(Unified Modelling Language).

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.913-914
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• 2006

This paper proposes a flexible IED platform which is implemented with a network processor and a DSP. DSP algorithms are downloaded through the embedded Linux based network processor remotely from ethernet. This architecture gives the best flexibility to adaptively accommodate the various algorithms needed in the IED environment. The developed IED platform can simultaneously measure data of the maximum of forty channels. The developed IED platform shows the successful operation, which measures and transfers the 8 channels data of 16bit samples sampled at 3.84kHz per each channel. The detailed performance analysis of the developed IED platform shows the about 10% processing load of CPU running at 533MHz.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.05a
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• pp.263-266
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• 2009

IEC 61850 based substation automation system is operating with Generic Object Oriented Substation Event message when an IED need to send an important signal to other IEDs or receive the signals from another IED such as trip and interlock. So interoperability of substation automation system may be assured throughout the verification of IED GOOSE. This paper shows a testing contents for GOOSE subscription and publish of IEC 61850 based IED and describes how to analysis the result of GOOSE testing. Now domestic IED completed by GOOSE test of this study are working in KEPCO test field.

• Proceedings of the KIEE Conference
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• 2007.10c
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• pp.68-70
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• 2007

본 논문에서는 전력용변압기의 예방진단 IED(Intelligent Electronic Devices) 개발에 대하여 기술하였다. 유입식 전력용변압기의 예방진단을 위한 IED 및 제반 시스템 구성, IED에 탑재된 알고리즘에 대하여 설명한다. 또한 시스템내부의 통신형태 및 HMI 화면구성에 대하여 소개한다.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.62 no.3
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• pp.133-138
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• 2013

A large generator is an important role in transferring an electric power to power system. The IEDs of large generator often use microprocessor technology to obtain a digital relay system with a wide range of measuring, protection, control, monitoring, and communication functions. However, all generator protection and control systems in Korea imported from abroad and are being operated. In order to reduce the large expense and improve the reliable operation, development of generator protection and control system by domestic technology is required. This paper deals with the design of the IED of generator protection panel for development of generator protection and control system. The major emphasis of the paper will be on the description of hardware and signal processing test results and measurement accuracy of the prototype IED. By developing of generator IED based on DSP and microprocessor, replacement of the generator protection panel imports are expected to be effective.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.462-463
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• 2006

본 논문에서는 당사에서 개발한 Digital Relay 및 Meter와 같은 IED들의 고장/이벤트 파형을 분석하는 툴인 Wave Analyzer를 소개한다. 기존 당사 파형 분석 툴들은 각기 하나의 IED에 대해서만 적용 가능하였으나 Wave Analyzer는 당사의 모든 IED에 대해 적용 가능하도록 통합형으로 개발하였다. 또한 고조파 분석, 벡터 다이어그램 등 파형 분석에 필요한 다양한 기능을 제공한다. Wave Analyzer는 다양한 기능을 가지고 있으며 모든 IED에 적용할 수 있어 당사 IED를 사용하는 사용자들에게 보다 편리함과 유용함을 제공할 것이다.

• Proceedings of the KIEE Conference
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• 2005.05a
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• pp.90-92
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• 2005

In this paper, we design a digital protection IED(Intelligent Electric Device) for a distributed power system in connection with power grid. The device can measure various elements for protection and communicate with another devices through network. The protection IED is composed of specific function modules: signal process module which converts analog signal from PT and CT handle algorithm to digital one; communication module for connection with another IEDs; input/output module for user-interfaces; main control module for control the whole modules. A general purpose DSP board with TMS320C2812 is used in the IED. Experiments with the power system simulator DOBLE have been made to verily the proposed hardware system.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.3-5
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• 2006

IEC 61850 기반의 변전소 자동화용 IED를 구현함에 있어서 IEC 61850 통신을 위한 IED의 통신부와 계전기능을 위한 보호계전부의 mapping은 중요한 부분이다. 물론 통신부와 보호계를 통합하여 구성할 수도 있지만 통신부와 보호계전부가 분리된 형태의 IED에서는 데이터 mapping의 방법이 필요하다. 보호계전부와 통신부가 분리된 토B의 경우, 보호계선 데이터를 IEC 61850데이터 형으로 적용하기 위해서는 데이터 형의 변화와 데이터의 연산 과정등의 mapping이 필요하다. 본 논문에서는 IEC 61850에서 표준으로 제시하는 CID(Configured IED Description)파일을 이용하여 보호계전부와 IEC 61850 통신부 사이의 데이터들의 mapping 방법과 동적 연산 방법을 제시하고 제시된 방법에 따른 결과물을 보여준다.