• Title/Summary/Keyword: Degradation diagnosis

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Design of a Reflector for Infrared Camera (열화상 카메라용 반사경 설계)

  • Bae, Young-Chul
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.1
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    • pp.97-104
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    • 2014
  • Recently infrared cameras have been widely used to diagnosis degradation status of the power substitution system. At the place of high magnetic field, however, electronic parts of infrared camera take a place problem that is not reasonable working due to high magnetic field. In this paper, technique of design for reflector is proposed to perform degradation diagnosis without damage of infrared camera in a power substation system including the rectifier that is able to impact to the infrared camera by high magnetic field.

The Development of HFPD System for Mibile-loading Vehicles (차량탑재형 HFPD의 개발)

  • Kim, Deok-Geun;Im, Jang-Seop;Yeo, In-Seon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05c
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    • pp.33-37
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    • 2001
  • Recently, the HFPD measurement testing is widely used in partial discharge measurement of HV machines because HFPD measurement testing receives less influence of external noise and has a merit of good sensitivity. Also HFPD testing is able to offer the judgement standard of degradation level of HV machine and can detect discharge signals in live-line. Therefore it is very useful method compare to previous conventional PD testing method and effective diagnosis method in power transformer that requires live-line diagnosis. But partial discharges have very complex characteristics of discharge pattern so it is required continuous research to development of precise analysis method. In recent, the study of partial discharge is carrying out discover of initial defect of power equipment through condition diagnosis and system development of degradation diagnosis using HFPD(High Frequency Partial Discharge) detection. In this study, simulated transformer is manufactured and HFPD occurred from transformer is measured with broad band antenna in real time, the degradation grade of transformer is analyzed through produced patterns in simulated transformer according to applied voltages.

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Analysis of degradation of distribution lightning arresters as degradation degree (열화정도에 따른 배전용 피뢰기의 열화특성 분석)

  • 장동욱;박동배;박영국;이용희;강성화;임기조
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.140-143
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    • 2000
  • The primary function of ZnO lightning arrester is to protect transmission and distribution equipment from overvoltages and to absorb electrical energy resulting from lightning or switching surges and form temporary overvoltage. However, ZnO lightning arrester are known to exhibit an increases in resistive current with time, the rate of increase being exacerbated with increasing applied voltage and ambient temperature. So, it is important to the leakage current measurement of ZnO lightning arrester. In addition, since the resistive leakage current caused by deterioration of ZnO lightning arrester mainly caused an increase of the third harmonic component, thereby it is possible the arrester degradation diagnosis by measuring the third harmonic component in the total leakage current. The leakage current and third harmonic component are measured and used to investigate the degradation diagnosis of ZnO element of arrester. Also the SEM photography is used to investigate the change of crystal structure of ZnO element with degradation.

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결정질 실리콘 태양광 모듈의 Potential Induced Degradation 진단 분석

  • O, Won-Uk;Park, No-Chang;Cheon, Seong-Il
    • Bulletin of the Korea Photovoltaic Society
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    • v.4 no.2
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    • pp.14-24
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    • 2018
  • The potential induced degradation (PID) phenomenon of crystalline silicon photovoltaic (PV) modules has been often found in outdoor PV systems until recently since firstly reported in 2010. Many studies have been conducted about the mechanism and the preventive methods, but systematic diagnosis of the PID has not been applied on-site. This paper focuses on analysis of 5 categories and 10 PID diagnosis methods using the monitoring data, light current-voltage, dark current-voltage, infrared and electroluminescence. We expect to contribute to improvement of power generation through PID diagnosis and troubleshooting in PV plants.

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Degradation Diagnosis by Void Defects Using a Neural Network (신경망을 이용한 보이드 결함에 의한 열화진단)

  • 최재관;김성홍;김재환
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.10
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    • pp.940-945
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    • 1998
  • In this paper, we obtained the data, which is required in training the neural network and diagnosing the degradation degree, by introducing the AE detection that is effective method in ordinary degradation diagnosis on activation. Aa the results of generalization tests by appling neural network to the unknown AE patterns obtained from two kinds of specimen, firstly as to evaluate an objective performance of neural network, the recognition ration for no-void specimen and 1[mm] -void specimen are appeared to be 98.9% and 92.5%, respectively. Also, in the evaluation of the adaptability of neural network with a new type of 0.2[mm] -void specimen, it is confirmed that the result appears to be 64% of recognition ratio at 94% of confidence interval coefficient in expectation output 0.2. On the other hand, the recognition capability of the neural network was confirmed by data from no-void and 1[mm] void specimen. The results prove the promising possibility of the application of ANN to discriminate specific void affecting as main degradation source at partial discharge condition in insulator containing multi-void by accummulated data base.

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A Lifetime Prediction and Diagnosis of Partial Discharge Mechanism Using a Neural Network (신경회로망을 이용한 부분방전 메카니즘의 진단과 수명예측)

  • Lee, Young-Sang;Kim, Jae-Hwan;Kim, Sung-Hong;Lim, Yun-Suk;Jang, Jin-Kang;Park, Jae-Jun
    • Proceedings of the KIEE Conference
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    • 1998.11c
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    • pp.910-912
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    • 1998
  • In this paper, we purpose automatic diagnosis in online, as the fundamental study to diagnose the partial discharge mechanism and to predict the lifetime, by introduction a neural network. In the proposed method, Ire use acoustic emission sensing system and calculate a fixed quantity statistic operator by pulse number and amplitude. Using statically operators such as the center of gravity(G) and the gradient of the discharge distribute(C), we analyzed the early stage and the middle stage. the fixed quantity statistic operators are learned by a neural network. The diagnosis of insulation degradation and a lifetime prediction by the early stage time are achieved. On the basis of revealed excellent diagnosis ability through the neural network learning for the patterns during degradation, it was proved that the neural network is appropriate for degradation diagnosis and lifetime prediction in partial discharge.

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The New Aging Diagnosis in IEC-60587 (IEC-60587의 새로운 열화진단)

  • Lim, Jang-Seob;Chung, Seung-Chun;Jeong, Jong-Cheol;Park, Gye-Choon;Lee, Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05b
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    • pp.71-74
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    • 2001
  • The conventional tracking testing as IEC-60587 is widely used In surface aging measurement of outside insulator because 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 outside 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 IIR-camera is carrying out discover of temperature of power equipment through condition diagnosis and system development of degradation diagnosis. In this study, SD occurred from IEC-60587 is measured with partial temperature distribution in real time, the degradation grade of SD is analyzed through produced patterns in IEC-60587 according to applied time.

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Survey of Damage Cases for Surge Protective Devices Installed Electrical Communication Systems and Analysis of Degradation Diagnosis Method (전자통신설비의 SPD 소손사례 및 열화진단기법 분석)

  • Lim, Jong-Wook;Lee, Jae-Young;Kwon, June-Hyuk
    • 한국정보통신설비학회:학술대회논문집
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    • 2009.08a
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    • pp.15-18
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    • 2009
  • In recent years electric devices and telecommunication facilities were often damaged by surge generated lightning discharge. When the service was interrupted by failure of electrical devices due to surge the social loss is very enormous. Therefore in order to protect electrical systems against lightning, SPDs(Surge protective device) have been used But damaged SPDs often make some troubles like fire and interrupt of service. In this work, 3rd harmonic leakage current defection method was applied as the diagnosis of SPD degradation and the effectiveness of this method was verified by field survey.

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Diagnosis of Liquid Ejector Performance with Numerical Analysis (수치해석을 이용한 액체용 Ejector 성능진단 기법)

  • Kim, Bum-Shin;Jang, Suck-Won;Jung, Hoon
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.856-860
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    • 2000
  • Liquid ejector is widely used for power plant water pump, marine pump and transportation of solid materials. It has high working confidence and simple configuration. However, It is not easy to know performance degradation of ejectors in field. When the geometry of ejector is complicate, the diagnosis of faults is required more skillful method without disassemble. This paper gives numerical method to predict cause of $45^{\circ}$ slurry suction ejector performance degradation.

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Development of a Performance Diagnosis Program for Gas Turbines Using Turbine Inlet Temperature Correction (터빈입구온도 보정기법을 적용한 가스터빈 성능진단 프로그램 개발)

  • Lee, Jae Hong;Kang, Do Won;Kim, Tong Seop
    • The KSFM Journal of Fluid Machinery
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    • v.20 no.2
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    • pp.32-40
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    • 2017
  • In this study, an in-house program to analyze the performance degradation for gas turbines is developed using MATLAB and is validated using commercial software. This program consists of design and off-design calculations. The results of design calculation is used for reference values of off-design calculation. The off-design calculation is composed of measured and expected performance analyses, and turbine inlet temperature correction. In general, performance degradation is analyzed by comparing the results of measured and expected performance analysis. However, if gas turbine performance degrades, turbine inlet temperature might increase due to the general control logic to comply with the power demand. Therefore, it is required to consider the deviation of turbine inlet temperature from the normal value in the performance diagnosis to analyze the performance degradation exactly. In this study, a special effort is given to the correction of turbine inlet temperature. The accuracy of the developed program is confirmed by comparison with commercial software, and its capability of performance diagnosis using the turbine inlet temperature correction is demonstrated.