• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2010.04a
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• pp.303-308
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• 2010

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2010.04a
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• pp.375-379
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• 2010

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2010.04a
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• pp.381-389
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• 2010

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2010.04a
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• pp.75-78
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• 2010

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.276-277
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• 2006

Estimation of power system frequency is an important task because frequency deviation is a good indicator of the system abnormal operating conditions. The algorithms, curve fitting, technique using Taylor series, deviation of phasor angle of fundamental waveform using DFT (Discrete Fourier Transform) and Prony method, are tested under operation of the frequency relaying by using EMTP MODELS. The performance of methods is compared with the simulation results.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.282-283
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• 2006

A frequency relaying algorithm which is used system separation and load shedding to improve transient stability is proposed. The algorithm can trip the generator and shed load in the abnormal frequency condition. The computer simulations of load flow analysis is used to determine the amount of load to be shed in an under frequency condition. Furthermore dynamic brake energization in the simulation is performed for the control of overfrequency.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.120-123
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• 2005

This paper, for the establishment of power system models and test procedures for the dynamic performance test of transformer protective relay, presents power system model, environment establishement between RTDS and protective relay, and the dynamic performance test generated internal fault or external fault.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.480-481
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• 2006

This paper presents computation of the neutral torrent using KEPCO's distribution system model which is composed by only one step type poles. The used system model is modelled and simulated by using ATPDraw. And the neutral current is calculated by using EMTP/MODELS.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.270-271
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• 2006

This paper presents the reclosing algorithm considering the DG(Distributed Generation). The algorithm consists of angle oscillation's judgment, EEEAC(Emergency Extended Equal-Area Criterion), calculation of optimal reclosing time and reconnection algorithm. The simulation is implemented for the three different DG technologies by using EMTP MODELS.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.484-485
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• 2006

The one step type pole and two step type pole are used in KEPCO's distribution system. The neutral current may occurs in three-phase four-wire distribution system due to unbalanced load. This paper presents neutral current both one step type pole and two step type pole in distribution system.