• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.11-12
• /
• 2007

In order to verify a digital substation based on IEC 61850, KEPRI in charge of POWER IT project related to SAS has constructed IED conformance testing system, which consists of HMI, IED (Intelligent Electronic Device), network equipment, V/I generator, and performed the interoperability test between two IEDs made by other vendors. The test was proceeded based on SCL and with system integrated tools

• Proceedings of the KIEE Conference
• /
• 2004.11c
• /
• pp.711-713
• /
• 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
• /
• 2007.07a
• /
• pp.489-490
• /
• 2007

In order to construct a digital substation based on IEC61850, All of the utility company should used IEDs to be verified and also vendors should get a certification from the international conformance testing organizationsuch as KEMA. So KEPRI in charge of POWER IT project related to SAS was required to IED conformance testing system, which can perform the test previously. The system, KEPCO developed, consists of HMI, IED (Intelligent Electronic Device), network equipment, V/I generator etc

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.1110-1111
• /
• 2007

These days, the concerns about maintenance and repair of electric facilities for stable and reliable electric power supply are increasing day by day. Because, we can have enormous damages economically and socially from a problem of the facilities, no matter how it is a small one. Especially, electric facilities in our country had been built abruptly from 40 years ago, so it can be thought that here are great amount of old facilities that must be repaired or replaced with new one, and the number would be increased time by time. On this situation, many researchers are studying the efficient and reliable method of maintenance for electric facilities and the results are applied on the facilities gradually by growing interests of operators and managers of the facilities. In this paper, the IED(Intelligent Electronic Devices) for Diagnosis system of electric machines are described. It takes analog data from a sensing device and operates digital processor to get a optimum digital data for diagnosis system. Now, this device is applied on several high voltage substations to diagnose and maintain GIS. Brief schematic of total diagnosis system and the construction of the IED are included in this paper.

• The Transactions of the Korean Institute of Electrical Engineers A
• /
• v.55 no.9
• /
• pp.351-358
• /
• 2006

In this paper, DSPOCS(Digital Switchgear-Panel Operation and Control Solution) is designed, which is the intelligent inference based operation and control solution to obtain the safety and reliability of electric power supply in substation based on IED. DSPOCS is designed as a scheduled monitoring and control task and a real-time alarm inference task, and is interlinked with BRES(Bus Reconfiguration Expert System) in the required case. The intelligent alarm inference task consists of the alarm knowledge generation part and the real-time pattern matching part. The alarm knowledge generation part generates automatically alarm knowledge from DB saves it in alarm knowledge base. On the other hand, the pattern matching part inferences the real-time event by comparing the real-time event information furnished from IEDs of substation with the patterns of the saved alarm knowledge base.; Especially, alarm knowledge base includes the knowledge patterns related with fault alarm, the overload alarm and the diagnosis alarm. In order to design the database independently in substation structure, busbar is represented as a connectivity node which makes the more generalized graph theory possible. Finally, DSPOCS is implemented in MS Visual $C^{++}$, MFC, the effectiveness and accuracy of the design is verified by simulation study to the typical distribution substation.

• Proceedings of the KIEE Conference
• /
• 2005.05a
• /
• pp.90-92
• /
• 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
• /
• 2005.10b
• /
• pp.517-519
• /
• 2005

In this paper, we consider a digital protection IED(Intelligent Electric Device) for a distributed power system. The IED 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. A general purpose DSP board with TMS320C2812 is used in the IED. In order to verify the proposed IED, experimental researches with the power system simulator DOBLE has been carried out for a phase earth fault. The results show an under-voltage relaying algorithm has been realized sucessfully in the hardware system.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.193-194
• /
• 2008

IEC 61850 기반의 변전소자동화시스템이 세계적으로 많은 관심을 가지면서 IEC 61850 프로토콜 기반의 IED(Intelligent Electronic Device) 개발을 위해 전 세계적으로 많은 노력이 진행되고 있다. 본 연구에서는 IEC 61850 표준규격에서 제안하는 객체 모델링 및 통신프로토콜을 이용하여 2권선 변압기 보호용 IED를 개발하고 그 구현방법을 설명하였다. 구현을 위해 리눅스 OS(Operation System)가 포팅된 통신보드에 MMS(Manufacturing Message Specification), GOOSE(Generic object oriented substation event) 통신모듈을 탑재하였고 데모 시스템을 구성하여 성능을 검증하였다.

• Journal of Advanced Marine Engineering and Technology
• /
• v.36 no.4
• /
• pp.527-532
• /
• 2012

Recently, in power system, even though the needs of protective IED(Intelligent Electronic Device) is highly increased, there are some problems in the field when use the IED. When the IED is in the fluctuated overload condition, because of the existing algorithm calculate the trip time only with the measured current of just previous measuring stage, the calculated trip time is not a proper value for the overload protection at this kind of condition, and when the load current fluctuate between overload and normal condition, because of the instantaneous reset characteristic of existing algorithm the IED dose not trip. And the non linear loads using power electronic elements seem to be increased. These non linear loads require a counterplan about various harmonics incoming to electric power systems. So we will give solutions about these problems.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.936-937
• /
• 2008

As a micro computer or micro processor technology has been advanced, the essential part which consists of electric power system has been changed into intelligent electronic device(IED), that is one kind of embedded system. There are already many parts changed into digital from analog in control and maintenance devices of electric system. These trends make advanced and novel concepts of devices and systems, that we couldn't even imagine in the analog circumstances. Now, the rate's of change is comparatively slower than IT field that is mainly represented by mobile communication, but that is a big change in the history of electric industries. Some people in those field called it Power-IT, and there have been many kinds of researches. Accelerated systems to go digital, users always and continuously demand more convenient, practical, and new functions. So, a lot of electric system manufactures have had tasks realizing many kinds of functions in an electronic device. According to the high-end technologies in semi-conductor and micro-computer field, manufactures can fully satisfy almost all of customer's needs, but there are other kinds of problems, such as large amount of program code, increasing complexity in proportion with program amount, and the hardness of maintenance and revision of the program. So nowadays, the necessity of embedded OS was emerged as a solution, and many researchers and manufactures have concentrated on studies related to embedded OS and its application.