• Proceedings of the KIEE Conference
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• 1997.07c
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• pp.927-929
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• 1997

In this paper, a new expert system scheme, called Logic Based Expert System (LBES), is proposed for real time fault diagnosis of power system. In LBES, Expertise is represented by logical connectives and converted into a Boolean function. The set of Prime Implicants (PIs) of the Boolean function contains all the sound inference results which can be obtained from the expertise. Therefore, off-line inference is possible by off-line PI identification, which reduces the on-line inference time considerably and makes it possible to utilize-the LBES in real-time environment.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.244-246
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• 2003

The construction conditions of transmission line in Korea are very hard. Actually, the construction project is processed inefficiently with constant civil appeal and interference by local residents of a region and environment organization, not to speak of landlord, because it is regarded as antipathy facility and passes through a lot of regions. Especially, it is concluded that effective practice of a construction project is serious in the future because transmission power voltage was upgraded to 765kV according to a sharp increase of electric power demand. Therefore, with the background of the experience of the past, this paper is aimed to study and establish a reasonable improvement plan which enables to eliminate wasteful factors for effective construction work of transmission line.

• Journal of the Korean Society of Industry Convergence
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• v.8 no.2
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• pp.69-76
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• 2005

This study for Customer Satisfaction(Customer Focus) by Profit security' in the field Process improvement activity and man-power upgrade by DAS(DATA Acquisition System) in the Plant that is fusion Off Line and On Line(IT), Especially the basic of the most foundation in the beginning Step of Toyota system is 3-jeong(a standard instrument; right volume, right box, right position), 5S(Seiri, Seiton, Seisoh, Seiketsu, Sitsuke ; KAISEN, KANBNA System(for Logistic), Further more KPC has established the digital environment such as CIM ; Computer Integrated Manufacturing), IMS ; Intelligent Manufacturing System ERP ; Enterprise Resource Planning, DAS; Data Acquisition System, Autonomous QC & SPC etc,.) in order to realize the intelligent informatization, which is core base for obtaining the competitive power and for responding to the various 21C management environment in flexibility. In this digital management environment, continuously and powerfully they would advance for becoming the best of the world. For strategic changes to take place in industry 3 key important factors need to be included ; Integration of tasks function and process, Decentralization of information, Responsibility, Finally simplification of products and product structures.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1259-1261
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• 1999

The paper proposes a simple method to calculate the portion of real power losses allocated to individual loads. The method is implemented by loss distribution factors, and analyses the share of loads in transmission line losses. Effectiveness of the algorithm is verified by a computer simulation. The results can be used to compute the cost of ancillary services under deregulated environment in electric power industries.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.100-102
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• 1998

In recent years, for the viewpoint of environment and electric power demand for stable secure, new energy such as photovoltaic system (PV) become increasingly popular. In case of interconnecting PV to the commercial electric company, two problems will occur when operating in isclation with the other general consumers. One is doing harm to the power quality. And the other is the security problem caused by charching a part of commercial system line that has to be no voltage. In this paper, a simple modelling of distribution system and grid-connected PV system and simulation result were proposed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.6
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• pp.1562-1574
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• 1998

We, in this paper, have implemented T1, E1 and fractional E1 HDSL(High-bit-rate digital subscriber line) function over an ATM switching system. The maxi$\mu$ loop lengths for subscriber service and cell loss rates to meet the bit error rate of 10$^{-7}$ at transmission of 2B1Q HDSL data E1 rate over existing telephone copper wires in the presence of the significant impairments such as NEXT(Nearned crosstalk), impulse noise, power line noise and longitudinal over the CSAs environment consisting of 26 gauge and 25 gauge unloaded copper telephone lines has assessed. HDSL will intially be used to serve private-DS1, ISDN-BRA, and DLC feeders, later DS1 extension from optic fiber cable. We also present market provision for the HDSL.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.2
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• pp.125-134
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• 2004

The new deregulated economic environment in the power utility market is forcing fundamental changes in the investment and operational decisions regarding transmission lines. Hence, it has come to be an important issue to evaluate their current utility in order to increase conductor ampacity based on conservative assumptions of worst case weather conditions. Static thermal rating has born still applied in most power companies worldwide, however some of them have been done various trials such as monitoring dynamic line ratings to increase line ratings in real time. This study is an attempt to access the static line ratings in Korea Electric Power Corporation(KEPCO) transmission lines, which were specified by weather model. Several environmental performances for determining static line ratings are examined by using the past weather data of Korean Meteorological Administration. As a result, it is shown that seasonal or regional line ratings could be adopt to the KEPCO's transmission lines, and their line ratings could be more increased without refurbishing current conductors in service to new high-temperature ones.

• Journal of Industrial Technology
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• v.21 no.A
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• pp.213-219
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• 2001

This paper describes the power line proximity warning device for mobile crane by using the induced voltage measurement method. A mobile crane worker can be easily exposed to dangerous electrical shock and the electrocution while this are working at near the high-voltage electrical lines. In this paper, the derivation electric-potential of the power lines are simulated and microprocessor-based detecting device and transmitter/receiver modules are introduced to show a solution for the dangerous mobile crane working environment.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2374-2376
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• 2001

In this paper we have developed a Power Line Proximity Detecting device for Mobile Crane by using a Derivation Electric-Potential Detection method. A mobile crane worker can be easily exposed to a dangerous electrical shock and the electrocution while they are working at near the high-voltage electrical lines. The derivation electric-potential of the power lines have been simulated in our experiment, Also, microprocessor-based detecting device and transmitter/receiver modules are introduced to show a solution for the dangerous mobile crane working environment. As a result, It has been shown a good functional field test.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1242-1244
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• 1999

AVR parameter tuning for voltage control of power system generators has generally been done with the open-circuit model of the synchronous generator. When the generator is connected on-line and operating at rated load conditions, the AVR operates in an entirely different environment from the open-circuit conditions. This paper describes a new method for AVR parameter tuning using optimization technique with on-line linearized system model. As this method considers not only the on-line models but also the off-line open-circuit models, AVR parameters tuned by this method can give the sufficiently stable performance at the open-circuit commissioning phase and give the desired performance at the operating conditions. Also this method estimates the optimum parameters for desired performance indices that are chosen for satisfying requirements in some practical applications, the performance of the AVR can satisfy the various requirements.