• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.1
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• pp.33-39
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• 2010

In order to operate the power system satisfactory for both system operators and customers, it is important to limit the harmonic currents to the allowable levels which injected into the system from the distorting installations. In this regard, the principles for the allocation of emission limits on individual customer were introduced in the technical report of IEC61000-3-6. According to these general principles, the emission limits are dependent on the agreed power of the customer, the power of the harmonic-generating equipment, and the system characteristics. The considerations in this report are very comprehensive and the process introduced is practical enough to implement as it is. However, there is a fact not appropriately dealing in the report that could be a very tickle but has a huge impact on determining the emission limit. This is the effect of non-harmonic load currents. More precisely, these are from the equipments which do not emit any harmonic or may emit harmonics but this specific order under the consideration by themselves if the source power is sinusoidal. The load currents originated from these equipments have an effect of active filter against the specific order of harmonic therefore, these should be dealt as a significant factoron the process of determining the emission limits for individual customer.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.12
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• pp.110-114
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• 2008

In recent years, the standard for harmonics has established and applied in many countries. However a harmonic management has not performed for the absence of standard and procedure in Korea. For this reason, the standard establishment for harmonic based on the main purpose of international harmonic standards and property of domestic transmission system is required. This paper describes the software of assessment of harmonic emission limit for customer at HV System using Microsoft Excel.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.10
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• pp.134-140
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• 2007

In recent years, power equipment and system standards have been increasing in both number and complexity. The standards that will soon be introduced to KOREA is the transmission system standards for harmonic emission limits assessing in distorting loads. Utility engineers, being under increasing time constraints, are turning more and more to software to quickly solve problems. This paper describes the methodology used to implement the above standards in Microsoft Excel in order to assist utility engineers to readily apply these standards in practical situations.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.10
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• pp.56-61
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• 2008

Because the harmonic disturbance characteristic which makes voltage drop and the deterioration of instantaneous power quality in electrical power system overheats the NGR and the customer capacitor and malfunctions the OCGR and AMR, it is necessary for electric power company to take active measures to reduce this disturbance. International Electrotechnical Commission(IEC) 61000-3-2 specifies limits for harmonic current emissions generated by low voltage(LV) electrical equipment whose input current $\leq$ 16(A) per phase. Analysis shows that limits for Class A equipment in IEC are calculated using the reference impedance of LV system and maximum permissible voltage and limits for other Classes are also calculated based on limits for Class A. Therefore we have calculated four(4) internal limits for LV electrical equipment using the korea reference impedance and maximum permissible voltage in this paper.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.59-60
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• 2008

비선형 부하의 급증으로 고조파로 인한 문제가 점차적으로 커지고 있으나 국내에서는 고조파 관리 기준 및 적용절차의 미비로 제대로 된 고조파 관리가 이루어지지 못하고 있다. 따라서 국내 송전계통에 연계되어는 있는 고압수용가에서 계통으로 유출할 수 있는 고조파 크기를 산정하는 프로그램이 필요하다. 국외에서는 IEC 61000-3-6 고조파 관리기준을 바탕으로 고압 수용가의 고조파 허용치 산정 알고리즘이 개발된 상태이다. 그러나 이 알고리즘을 국내 송전계통에 바로 적용할 수 없다. 따라서 이 알고리즘을 바탕으로 국내 송전계통 실정에 맞는 알고리즘으로 보완하고, 마이크로 소프트 엑셀 프로그램을 이용하여 고압 수용가 고조파 허용치 산정 프로그램을 개발하였다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.563-564
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• 2007

In recent years, equipment and network standards have been increasing in both number and complexity. Two standards that will soon be introduced to KOREA are the HV standards for assessing distorting and fluctuating loads, IEC 61000-3-6. Utility engineers, being under increasing time constraints, are turning more and more to software to quickly solve problems. This paper describes the methodology used to implement the above standards in Microsoft Excel in order to assist utility engineers to readily apply these standards in practical situations.