• Title/Summary/Keyword: On-line monitoring system

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On-line and Off-line Partial Discharge Monitoring System with HVAC Testing (HVAC에 의한 On-line, Off-line PD 모니터링)

  • Choi, Yong-Sung;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.04c
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    • pp.111-114
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    • 2008
  • The paper considers the relation between on-line monitoring and diagnostics on the one hand and high-voltage (HV) withstand and partial discharge (PD) on-site testing on the other. HV testing supplies the basic data (fingerprints) for diagnostics. In case of warnings by on-line diagnostic systems, off-line withstand and PD testing delivers the best possible information about defects and enables the classification of the risk. Because alternating voltage (AC) is the most important test voltage, the AC generation on site is considered. Frequency tuned resonant (ACRF) test systems are best adapted to on-site conditions. They can be simply combined with PD measuring equipment. The available ACRF test systems and their application to electric power equipment -from cable systems to power transformers - is described.

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Investigation of On-line Monitoring Method on 1500 V Direct Current Cable of Subway

  • Shen, Xiaojun;Jiang, Xiuchen;Yi, Zeng
    • Transactions on Electrical and Electronic Materials
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    • v.7 no.5
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    • pp.247-251
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    • 2006
  • The traction DC feeder cable is one of the key devices for the safety operation of subway system, but for low voltage DC feeder cable (<3000 V) for subway, little attention has been paid by investigators on its online monitoring technology. With an introduction of cable laying and operation environment for the cable, this paper investigated the on-line monitoring technology of 1500 V DC feeder cable of subway. Firstly, in the text, the fault model of 1500 V DC cable was proposed based on the analysis of the fault type of the DC feeder cable, and then put forward synthetically on-line monitoring discharge signal and DC leakage current signal to assess DC feeder cable insulating state. The results of laboratory experiment prove that the proposed methods are feasible and can be implemented on-line monitor on DC feeder cable of subway.

A study on field test of diagnostic Monitoring System for Power Transformers (전력용 변압기 예방진단 시스템의 실 계통 적용 연구)

  • Kim, Y.H.;Lee, C.R.;HwangBo, S.W.;Shin, Y.T.;Park, G.C.;Park, K.S.
    • Proceedings of the KIEE Conference
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    • 2004.05b
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    • pp.91-93
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    • 2004
  • This study presents recent trends on the on-line monitoring and diagnostic systems for oil-immersed transformers. Specially, our system on Yeo Su thermal power plant is introduced for high sensitivity and accuracy of ours. It is combined with communication networks to provide an on-line remote monitoring system. Several alarm criteria are formulated to enable a superimposed monitoring system to perform decisive action. The reasons for monitoring the condition and maintaining the health of electrical apparatus were discussed. The experience at the fields and the criteria for the judgment are also discussed in detail.

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The Study on a PD On-line Monitoring System Used for Large Turbine Generators (대용량 터빈 발전기에 사용되는 온라인 부분방전 관측 시스템에 관한 연구)

  • O, Gwang-Yeong;Gang, Dae-Yong;Park, Dae-Hui
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.1
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    • pp.45-50
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    • 1999
  • This paper describes a partial discharge (PD) on-line monitoring system used for large turbine generators. The system consists of a broadband current transducer, a computer-aid PD measurement system. By using a programmable fabricate band pass filter and an adaptive digital filter, the system can suppress the noise and extract PD signal from the intense noise surroundings successfully. Two simulated PD sources, which often exist in the large generators, were simulated and detected. At the end of this paper, some field test results, obtained from a 200MW generating set, were presented and discussed.

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A Study on Development of Automated Monitoring System for Road Cut Slopes (위험도로사면의 실시간 무인감시시스템 개발 연구)

  • 김춘식;이광우;윤수호;조삼덕
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.11a
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    • pp.607-614
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    • 2000
  • A cost-effective automated slope monitoring system is developed to monitor hazardous cut slopes along highways. This automated slope monitoring system consists of data-collection and visual monitoring, data-transmitting, database and internet service, and alarm system. Wire-line extensometer, automatic raingauge, and CCD camera are selected as monitoring instruments in this system, after consideration of failure characteristics of roadside cut slopes in the country. This paper describes the important features of this newly developed automated slope monitoring system.

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On-line Monitoring of Glucose and Acetate by Flow-Injection Analysis in Escherichia coli Fermentation Process (대장균 발효공정에서 흐름주입분석을 이용한 글루코스와 초산의 온라인 모니터링)

  • 이종일
    • KSBB Journal
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    • v.13 no.3
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    • pp.244-250
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    • 1998
  • Flow-injection analysis (FIA) for on-line monitoring of glucose and acetate are described and employed in E.coli fermentation process. Glucose oxidase (GOD) for the detection of glucose is immobilized on epoxy polymer support, which is packed in a small cartirdge, and applied to a GOD-FIA system. The detection of acetate is based on the inhibition of acetate to the oxidation of sarcosine by sarcosine oxidase (SOD). SOD is also immobilized on epoxy polymer support and used for a SOD-FIA system. GOD-FIA system is characterized as well as SOD-FIA system by the investigation of the effects of pH, temperature and metabolites in samples on the peak height. GOD-FIA and SOD-FIA systems were also applied for on-line On-line measurements buy FIA measurements by FIA were in god agreement with off-line measurements.

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Continuous On-Line Partial Discharge Monitoring System for Stator Winding of Generators (발전기 고정자 권선의 운전중 부분방전 모니터링 시스템 개발)

  • Jeon, Jeong-Woo;Hwang, Don-Ha;Kim, Yong-Joo
    • Proceedings of the KIEE Conference
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    • 1998.07e
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    • pp.1734-1736
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    • 1998
  • On-line partial discharge monitoring system for generator stator insulation is developed. This system consists of remote and host units. The remote unit detects partial discharge signals from SSC(Stator Slot Coupler) installed between wedge and stator windings. The host unit monitors the condition of winding insulation. This system will be used as a module of a generator on-line monitoring system utilizing global network.

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Literature Review of Machine Condition Monitoring with Oil Sensors -Types of Sensors and Their Functions (윤활유 분석 센서를 통한 기계상태진단의 문헌적 고찰 (윤활유 센서의 종류와 기능))

  • Hong, Sung-Ho
    • Tribology and Lubricants
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    • v.36 no.6
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    • pp.297-306
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    • 2020
  • This paper reviews studies on the types and functions of oil sensors used for machine condition monitoring. Machine condition monitoring is essential for maintaining the reliability of machines and can help avoid catastrophic failures while ensuring the safety and longevity of operation. Machine condition monitoring involves several components, such as compliance monitoring, structural monitoring, thermography, non-destructive testing, and noise and vibration monitoring. Real-time monitoring with oil analysis is also utilized in various industries, such as manufacturing, aerospace, and power plants. The three main methods of oil analysis are off-line, in-line, and on-line techniques. The on-line method is the most popular among these three because it reduces human error during oil sampling, prevents incipient machine failure, reduces the total maintenance cost, and does not need complicated setup or skilled analysts. This method has two advantages over the other two monitoring methods. First, fault conditions can be noticed at the early stages via detection of wear particles using wear particle sensors; therefore, it provides early warning in the failure process. Second, it is convenient and effective for diagnosing data regardless of the measurement time. Real-time condition monitoring with oil analysis uses various oil sensors to diagnose the machine and oil statuses; further, integrated oil sensors can be used to measure several properties simultaneously.

A study of system development for on-line monitoring and fault diagnosis of a concrete plant (콘크리트 플랜트의 온-라인 감시 및 고장진단을 위한 시스템 개발에 대한 연구)

  • 공영준;장태규;양원영
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.228-232
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    • 1993
  • This paper describes a on-line monitoring and fault diagnosis system designed for the automation of a medium-size concrete plant. The system is based on the structure of a hardware system of data acquisition and a personal computer. Simulation results are presented to illustrate the system operation. It applies the preconstructed rules to the plant data for the diagnosis of weighing processes.

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Development of Fiber-Optic AE Sensor for On-Line Monitoring System (광섬유를 이용한 상시감시 시스템용 음향방출센서의 개발)

  • Nam, Jae-Yeong;Jeong, Jae-Hyeon;Choe, Jae-Bung;Kim, Yeong-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.12
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    • pp.2891-2898
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    • 2000
  • The objective of this paper is to develop a fiber-optic acoustic emission(AE) sensor applicable to on-line monitoring systems which is suitable for long-distance signal transmission. An AE sensor was developed by use of a fiber-optic cantilever and an extrinsic Fabry-Perot interferometer(EEPI). The efficiency of signal processing was improved by driving the high frequency AE signals into the low frequency ones. In order to verify the developed sensor, the tensile and the pencil lead fracture(PLF) tests were performed including the experiment showing the Kaiser effect. Form tests, AE signals were successfully detected in the elastic-plastic deformation range, especially higher signals at the crack propagation. The developed sensor was expected to be used for an on-line monitoring of crack propagation in mechanical system.