• Title/Summary/Keyword: ITI curve

Search Result 3, Processing Time 0.017 seconds

A Study on the Harmonics and Voltage Sags Effect by the Series Resonant Filter Application for Personal Computer Loads (개인용 컴퓨터 부하의 직렬동조필터 적용에 의한 고조파 및 순간전압강하 영향에 관한 연구)

  • Seo, Beom-Gwan;Kim, Kyung-Chul;Lee, Il-Moo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.20 no.8
    • /
    • pp.36-41
    • /
    • 2006
  • Computer Loads can be found in all of modern society. The switching mode power supplies used in personal computers are major sources of harmonic currents. Harmonic currents can cause lots of harmonic problems such as disruption in computer performance. A series resonant filter is very effective in harmonic reduction for personal computer loads. Voltage sags are short duration reductions in rms voltage. The main causes of voltage sags at faults, motor starting, and transformer energizing. Personal computers are another example of devices sensitive to voltage sags. A serious voltage sag at the terminals way lead mis-operation of the equipment. This paper presents an in depth analysis to evaluate the effect of harmonics reduction based on the IEC 61000-3-2 and the effect of voltage sag using ITI curve by applying a series resonant filter for personal computer loads.

Features of Transient Overvoltages Observed at 22.9kV Consumer's Substation (22.9kV 수전설비에서 측정된 과도과전압의 특성)

  • Shim, Hae-Sup;Lee, Bok-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.28 no.9
    • /
    • pp.52-59
    • /
    • 2014
  • The aims of this paper are to characterize the transient overvoltages(TOVs) and to evaluate the risk occurring at 22.9kV consumer's substation. The measurements of lightning- and switching-caused TOVs were made during Mar. 2013 and Feb. 2014. As a consequence, 47 events of TOVs were recorded and 4 of them were higher than the input voltage envelope(IVE) of the information technology industry council(ITI) curve. The measured TOVs are characterized by longer front times and longer durations compared to the $1.2/50{\mu}s$ standard impulse voltage waveform, and some of them represent bipolar waves with lower oscillation frequencies. It suggests that the test of non-standard impulse voltage waveforms is needed for effective risk assessments of power apparatus. Lightning- and switching-caused TOVs exceeding IVE of ITI curve are induced at the secondary of 22.9kV potential transformer(PT). We may, therefore, conclude that the surge protection devices should be applied at the secondary of PT and the surge absorbers should be installed at the primary of VCB or PT. The results presented in this paper could be useful to design the reasonable insulation coordination for 22.9kV consumer's substation.

A Study on the Harmonics and Voltage Sags Effect by the Series Resonant Filter Application for Personal Computer Loads (컴퓨터 부하의 직렬 동조 필터 적용에 의한 고조파 및 순간전압강하 영향에 관한 연구)

  • Seo, Beom-Gwan;Kim, Kyoung-Chul;Lee, Geun-Joon
    • Proceedings of the KIEE Conference
    • /
    • 2006.07a
    • /
    • pp.460-461
    • /
    • 2006
  • Computer Loads can be found in all of modern society. The switching mode power supplies used in personal computers are major sources of harmonic currents. Harmonic currents can cause lots of harmonic problems such as disruption in computer performance. A series resonant filter is very effective in harmonic reduction for personal computer loads. Voltage sags are short duration reductions in rms voltage. The main causes of voltage sags are faults, motor starting, and transformer energizing. Personal computers are another example of devices sensitive to voltage sags. A serious voltage sag at the terminals way lead mis-operation of the equipment. This paper presents an in depth analysis to evaluate the effect of harmonics reduction based on the IEC 61000-3-2 and the effect of voltage sag using ITI curve by applying a series resonant filter for personal computer loads.

  • PDF