• Title/Summary/Keyword: Degradation diagnosis

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Diagnosis for Degradation of Transformer Oil by an Optical Fiber Sensor (광섬유 센서를 이용한 변압기 절연유의 열화 진단)

  • Yi, Sue-Muk;Kim, Tae-Young;Suh, Kwang-S.;Sung, Man-Young
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.1563-1565
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    • 2000
  • This paper presents the preliminary results on the application of optical fiber sensor(OFS) for the diagnosis of degradation in the transformer oil. An OFS system using a Mach-Zehnder interferometry technique was built to detect attenuation of acoustic signal produced by discharging. With increasing the number of discharging in the insulation oil, the attenuation of acoustic signal became greater. A strong correlation between electrical and acoustic signal intensities from discharge generated in the transformer oil was confirmed by the results reported here.

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Condition Diagnosis by the Complex Accelerating Degradation for fault Prediction & estimation of reliability on the traction motor - Insulation Resistance & Polarization Index Properties (견인전동기의 고장예측 및 신뢰성 평가를 위한 복합가속열화 상태진단 - 절연저항 및 성극지수 특성 연구)

  • Wang, Jong-Bae;Byun, Yoon-Sub;Baek, Jong-Hyen;Park, Hyun-Jun
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.1374-1376
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    • 2000
  • In this paper, sample coils for stator form-wound winding of traction motor were tested by the accelerative thermal degradation, which composed of heat, vibration, moisture and overvoltage applying. Reliability and expected life were evaluated on the insulation system for 200 class traction motor. After aging of 10 cycles, insulation resistance and PI properties were investigated as diagnosis tests in the range of $20{\sim}160^{\circ}C$. Analysis of polarization properties was performed on the base of do current-time change.

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The Analysis of Weibull Distribution on the Monitoring of IRR Camera (적외선 모니터링 관측의 와이블 분포해석)

  • Lim, Jang-Seob;Kim, Jin-Gook;Lee, Hack-Hyun;Lee, Jin;Lee, Woo-Sun
    • Proceedings of the KIEE Conference
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    • 2004.11a
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    • pp.264-267
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    • 2004
  • The conventional testing as IEC-60587 is widely used in surface aging measurement of outside insulator those testing can carry out very short time in Lab testing. Also IEC-60587 testing is able to offer the standard judgement of relative degradation level of out side HV machine. Therefore it is very useful method compare to previous conventional tracking testing method and effective Lab testing method, But surface discharges(SD) have very complex characteristics of discharge pattern so it is required estimation research to development of precise analysis method. In recent, the study of IRR Camera is carrying out discover of temperature of power equipment through condition diagnosis and system development of degradation diagnosis.

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Temperature Distribution Monitoring of Transformer (변압기 온도 변화특성 모니터링)

  • Lee, Woo-Sun;Jung, Chan-Moon;Son, Dong-Min;Seo, Young-Jin;Lim, Jang-Sub
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.08a
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    • pp.69-72
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    • 2002
  • The conventional thermal insulator and power transformer testing is widely used in surface aging measurement of outside insulator because those testing can carry out very short time in Lab testing. Also thermal testing is able to offer the standard judgement of relative degradation level of outside HV machine. There it is very useful method compare to previous conventional thermal testing method and effective Lab testing method. But surface discharges(SD) have very complex characteristics of discharge pattern so it is required estimation research to development of precise analysis method. In recent, the study of IRR-camera is carrying out discover of temperature of power equipment through condition diagnosis and system development of degradation diagnosis. In this study, thermal testing of power transformer is measured with partial temperature distribution in real time.

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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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Implementation of Automated Motor Fault Diagnosis System Using GA-based Fuzzy Model (유전 알고리즘기반 퍼지 모델을 이용한 모터 고장 진단 자동화 시스템의 구현)

  • Park, Tae-Geun;Kwak, Ki-Seok;Yoon, Tae-Sung;Park, Jin-Bae
    • Proceedings of the KIEE Conference
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    • 2005.05a
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    • pp.24-26
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    • 2005
  • At present, KS-1000 which is one of a commercial measurement instrument for motor fault diagnosis has been used in industrial field. The measurement system of KS-1000 is composed of three part : harmonic acquisition, signal processing by KS-1000 algorithm, diagnosis for motor fault. First of all, voltage signal taken from harmonic sensor is analysed for frequency by KS-1000 algorithm. Then, based on the result values of analysis skilled expert makes a judgment about whether motor system is the abnormality or degradation state. But the expert system such a motor fault diagnosis is very difficult to bring the expectable results by mathematical modeling due to the complexity of judgment process. In this reason, we propose an automation system using fuzzy model based on genetic algorithm(GA) that builded a qualitative model of a system without priori knowledge about a system provided numerical input output data.

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A Study on Pattern Making of Degradation Type Using K-means (K-means를 이용한 열화 형태의 패턴화에 관한 연구)

  • Lee, Deok-Jin
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.12
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    • pp.877-882
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    • 2014
  • It has been confirmed that the inner defect of transformer and the perfect diagnosis for aging are closely related to safe electric power transmission system and that the detection of accident and diagnosis technique turn out to be very important issues. Since electric power machinery consists of various kinds of components, however, it is very difficult to make a diagnosis for aging by one parameter. Thus, diagnosis for aging is feasible only through the combination of various parameters. Recently, various expert systems have been developed and applied to diagnosis for aging, but they are not yet reliable enough to apply to the real system. In this paper, XLPE which is ultra high voltage cable insulator material were chosen to investigate the influence of void on insulator material using partial discharge. Obtained data have been processed by PRPD (phased resolved partial discharge) distribution function and K-means. And statistical and cluster distribution of partial discharge have been analysed and investigated.

Detecting Method of Internal Degradation for Cable using Finite Element Method (와전류 센서를 이용한 케이블용 내부 열화 검출 방법)

  • Park, Geon-Ho
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2015.01a
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    • pp.291-292
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    • 2015
  • 와전류 탐상 기법을 이용하여 배전선로의 내부 열화를 검출하는 시스템을 개발할 수 있는데, 본 연구에서는 이를 위하여 유한요소법을 통한 시뮬레이션으로 와전류 센서의 기초 모델링을 구상한 후 실제 와전류 센서를 제작하여 가속 열화에 의한 센서 특성을 조사하였다.

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A Study on Deterioration Diagnostic Method for Electrical Wires of Electric Multiple Units (도시철도차량 전선에 대한 열화진단 방법 고찰)

  • Hong, Yong-Ki;Chung, Jong-Duk;Pyun, Jang-Sik
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.680-687
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    • 2009
  • Several kinds of Electrical Wires have been used in Electric Multiple Units(EMU) for the supply of electric power, supervision, and the propagation of control signals. These Electrical Wires must be inspected for safe and stable operation of EMU. The degradation diagnosis to estimate the integrity of Electrical Wires has recently been requested according to the long use of EMU. This paper describes on application of diagnosis method for EMU.

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Investigation on Oil-paper Degradation Subjected to Partial Discharge Using Chaos Theory

  • Gao, Jun;Wang, Youyuan;Liao, Ruijin;Wang, Ke;Yuan, Lei;Zhang, Yiyi
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1686-1693
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    • 2014
  • In this paper, oil-paper samples composed of transformer windings were used to investigate the insulation degradation process subjected to partial discharge (PD), with artificial defects inside to simulate the PD induced insulation degradation. To determine appropriate test voltages, the breakdown time obtained through a group of accelerated electrical degradation tests under high voltages was firstly fitted by two-parameter Weibull model to acquire the average breakdown time, which was then applied to establish the inverse power law life model to choose advisable test voltages. During the electrical degradation process, PD signals were synchronously detected by an ultra-high frequency (UHF) sensor from inception to breakdown. For PD analysis, the whole degradation process was divided into ten stages, and chaos theory was introduced to analyze the variation of three chaotic parameters with the development of electrical degradation, namely the largest Lyapunov exponent, correlation dimension and Komogorov entropy of PD amplitude time series. It is shown that deterministic chaos of PD is confirmed during the oil-paper degradation process, and the obtained results provide a new effective tool for the diagnosis of degradation of oil-paper insulation subjected to PD.