• Title/Summary/Keyword: Residual current

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Electroplating of High Wear Resistant Rhodium using Pulse Current Plating Method (펄스도금법을 이용한 고내마모성 로듐 도금층 형성에 관한 연구)

  • Lee, Seo-Hyang;Lee, Jae-Ho
    • Journal of the Microelectronics and Packaging Society
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    • v.26 no.2
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    • pp.51-54
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    • 2019
  • The electrodeposition of rhodium (Rh) on silicon substrate at different current conditions were investigated. The cracks were found at high current density during the direct current (DC) plating. The pulse current (PC) plating were applied to avoid the formation of cracks on the deposits. Off time in the pulse plating relieved the residual stress of the Rh deposits and consequently the current conditions for the crack-free Rh deposits were obtained. Optimum pulse current (PC) condition is 5:5 (on:off) for the crack-free Rh electroplating.

A Non-uniform Correction Algorithm Based on Scene Nonlinear Filtering Residual Estimation

  • Hongfei Song;Kehang Zhang;Wen Tan;Fei Guo;Xinren Zhang;Wenxiao Cao
    • Current Optics and Photonics
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    • v.7 no.4
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    • pp.408-418
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    • 2023
  • Due to the technological limitations of infrared thermography, infrared focal plane array (IFPA) imaging exhibits stripe non-uniformity, which is typically fixed pattern noise that changes over time and temperature on top of existing non-uniformities. This paper proposes a stripe non-uniformity correction algorithm based on scene-adaptive nonlinear filtering. The algorithm first uses a nonlinear filter to remove single-column non-uniformities and calculates the actual residual with respect to the original image. Then, the current residual is obtained by using the predicted residual from the previous frame and the actual residual. Finally, we adaptively calculate the gain and bias coefficients according to global motion parameters to reduce artifacts. Experimental results show that the proposed algorithm protects image edges to a certain extent, converges fast, has high quality, and effectively removes column stripes and non-uniform random noise compared to other adaptive correction algorithms.

A Study on Corrosion Characteristics of $SUP-9/50CrV_{4}$by Surface Processing (표면처리법에 따른 $SUP-9/50CrV_{4}$의 부식특성에 관한 연구)

  • Jung, Jae-Wook;Park, Kyung-Dong
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.319-324
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    • 2004
  • In this study, the high strength and superior toughness spring steels as the suspension material, used for automobile and railroad industries were utilized to carry out the following investigations. Corrosion times were controlled in 7, 14, 30 and 60days to examine the relation between corrosion pit and compressive residual stress in the static corrosion environment after shot peened. And then corrosion current and corrosion potential were measured for every 24 hours to investigate the corrosion mechanism. Shot peened material shows the low or rate of corrosion current as compared with unpeened material. In case of peened material which has the highest residual stress, it has a low corrosion current density.

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An Algorithm for Detecting CT Saturation (변류기 2차 전류의 포화 여부 판단 알고리즘)

  • Kang, Y.C.;Ok, S.H.;Kang, S.H.
    • Proceedings of the KIEE Conference
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    • 2000.11a
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    • pp.64-66
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    • 2000
  • This paper presents an algorithm for detecting current transformer (CT). At the instants of beginning and end of saturation, the increment of the secondary current is reduced significantly, depending on the residual flux and saturation time. Thus, the third difference of the current is used to detect saturation in this paper. If the third difference is less than threshold the CT is at the beginning/end of saturation. The proposed detection method is unaffected by the amount of residual flux. The results of various tests with residual flux from -80% to +80% indicate satisfactory performance of the method.

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Response Characteristic Analysis of ZnO Varistors by the Conductive E1 Pulse (전도성 E1 펄스에 대한 ZnO 바리스터의 동작특성 분석)

  • Bang, Jeong-Ju;Huh, Chang-Su
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.32 no.3
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    • pp.241-245
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    • 2019
  • This work presents the response characteristics of a ZnO varistor to conductive EMP. An E1 pulse, standardized to MIL-STD-188-125-1, was applied to the varistors wherein the residual current and response times were measured with the applied E1 pulse current. Additionally, the response time was measured according to the length of the connection path. Consequently, the amplitude of the residual voltage through the ZnO varistors was increased with increasing amplitude of the applied E1 pulse current. As the length of the connection path increased, the operating response time and residual peak voltage also increased. These results indicate that the response characteristics of ZnO varistors can be applied to basic data to support the use of varistors as a protective measure against conductive EMP.

The Mechanical Property of Electroplated Cu Film

  • Cho, Chul-Ho;Ha, Seung-Mo;Ahn, Yoo-Min;Kim, Dae-Kun;Lee, Jae-Ho
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.10b
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    • pp.139-140
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    • 2002
  • This paper discusses the effect of plating condition on the mechanical property of electroplated Cu film. Current density, the amount of the organic additives was found to affect the residual stress of electroplated copper film. The result show that, in the case of residual stress, the copper film deposited at higher additive result in lower residual stress and plating current by $15mA/cm^2$ induced a better result than any other ones.

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Effect of Radial Rays on Residual Voltage for EPR cable (EPR 케이블의 잔류전압에 미치는 방사선의 영향)

  • 이성일;류성림;김용추
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.05a
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    • pp.518-521
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    • 1999
  • This paper describes the properties of discharge current and the residual voltage for $^{60}$ C$_{0}$ -${\gamma}$ irradiated cables using in nuclear power generating station. As these properties related with $^{60}$ C$_{0}$ -${\gamma}$ -irradiatiation dose, it is suggested that these properties can be utilized as a index of irradiation degradation. As the ratio of degradation increases, the residual voltage in the initial time range increases and the peak moves to the shorter time. Therefore, I know the degree of radiation degradation from the position of the peak.

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Characteristics of Lightning Impulse Current of Zno Block for Transmission Line Arrester with External Gap (송전선로에 사용되는 갭형 피뢰기 소자의 뇌임펄스 전류특성)

  • Cho, Han-Goo;Yoo, Dae-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.04b
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    • pp.61-62
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    • 2009
  • This paper describes the characteristics of lightning impulse current of ZnO block for transmission line arrester with external gap. The ageing parameters of lightning arresters ate impulse current, moisture ingress, temperature ageing and so on. Especially it is important to estimate the change of electrical characteristics by impulse current. Total energy applied to the ZnO arrester each time is $4/10{\mu}s$, 30kA and $2/20{\mu}s$, 10kA impulse current. Before and After the test, the residual voltage variation of varistors passed was below 5%. According to the test, it is thought that the ZnO arrester shows good stability with impulse current test.

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Characteristics of Lightning Impulse Current of ZnO Block for Transmission Line Arrester with External Gap (송전선로에 사용되는 갭형 피뢰기 소자의 뇌임펄스 전류특성)

  • Cho, Han-Goo;Yoo, Dae-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.458-459
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    • 2007
  • This paper describes the characteristics of lightning impulse current of ZnO block for transmission line arrester with external gap. The ageing parameters of lightning arresters are impulse current, moisture ingress, temperature ageing and so on. Especially it is important to estimate the change of electrical characteristics by impulse current. Total energy applied to the ZnO arrester each time is $4/10{\mu}s$, 30kA and $2/20{\mu}s$, 10kA impulse current. Before and After the test, the residual voltage variation of varistors passed was below 5%. According to the test, it is thought that the ZnO arrester shows good stability with impulse current test.

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Effect of Harmonics on Residual Current Protective Devices (고조파가 누전차단기에 미치는 영향)

  • Jeon, Jeong-Chay;Lee, Sang-Ick;Yoo, Jae-Geun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.3
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    • pp.84-89
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    • 2006
  • Tripping of residual current protective devices(RCPDs) caused by harmonics has been continuously reported, but no literature is available on the behavior of RCPDs caused by harmonics. This paper, in order to find out the effects of harmonics on RCPDs, investigated the present condition on malfunction of RCPDs and measured harmonics at buildings where nuisance tripping of RCPDs was often occurred. Also, the operational characteristics of RCPDs were tested by the harmonics synthesizer that can generate distorted waveform. Results of experiment detected that there was minimum tripping current of RCPDs when third harmonic added to the fundamental frequency. And it was found that the leakage current to cause tripping of RCPDs increased with more higher order harmonics added to the fundamental frequency.