• Title/Summary/Keyword: Fault indication

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Performance monitoring and fault node identification method for real-time ATM network management system (실시간 ATM 망 관리 시스템 구현을 위한 성능 감시와 고장 노드 식별 방안)

  • 최용훈;이길흥;송운섭;이준호;이재용;이상배
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.6
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    • pp.1311-1322
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    • 1997
  • Performance management of ATM network is urgently required because a different quality of service should be guaranteed on each connection. A lot of performance measurement data increase the burden on agent systems and on managment stations. In this paper, an effective OAM-based performance monitoring and faulty node identification technique is proposed. A proposed VP Selection Algorithm reduces management-related traffic and when the indication of hard or soft failure state is detected, failed node is identified by Fault Identification Rule.

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Arc Detection Method using RSSI Signal to High Frequency Noise (고주파 노이즈의 RSSI신호를 이용한 Arc검출방법)

  • Yang, Seung Kook;Lee, Ju
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.3
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    • pp.102-106
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    • 2015
  • In order to avoid the electrical fire, AFCI(Arc Fault Cirruit Interrupter) has been obligated to be adopted in the United States of America since 2002. A study was carried out on how to detect Arc. In this paper, The propose is high-frequency signal detection methods and RSSI(Received Signal Strength Indication) signal processing algorithm for Arc detection. and the electrical characteristics were verifying.

Real-time In-situ Plasma Etch Process Monitoring for Sensor Based-Advanced Process Control

  • Ahn, Jong-Hwan;Gu, Ja-Myong;Han, Seung-Soo;Hong, Sang-Jeen
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.11 no.1
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    • pp.1-5
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    • 2011
  • To enter next process control, numerous approaches, including run-to-run (R2R) process control and fault detection and classification (FDC) have been suggested in semiconductor manufacturing industry as a facilitation of advanced process control. This paper introduces a novel type of optical plasma process monitoring system, called plasma eyes chromatic system (PECSTM) and presents its potential for the purpose of fault detection. Qualitatively comparison of optically acquired signal levels vs. process parameter modifications are successfully demonstrated, and we expect that PECSTM signal can be a useful indication of onset of process change in real-time for advanced process control (APC).

Improvement in Transformer Diagnosis by DGA using Fuzzy Logic

  • Dhote, Nitin K.;Helonde, J.B.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.2
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    • pp.615-621
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    • 2014
  • Power transformer is one of the most important equipments in electrical power system. The detection of certain gases generated in transformer is the first indication of a malfunction that may lead to failure if not detected. Dissolved gas analysis (DGA) of transformer oil has been one of the most reliable techniques to detect the incipient faults. Many conventional DGA methods have been developed to interpret DGA results obtained from gas chromatography. Although these methods are widely used in the world, they sometimes fail to diagnose, especially when DGA results falls outside conventional method codes or when more than one fault exist in transformer. To overcome these limitations, fuzzy inference system (FIS) is proposed. 250 different cases are used to test the accuracy of various DGA methods in interpreting the transformer condition.

Fault Diagnostics Algorithm of Rotating Machinery Using ART-Kohonen Neural Network

  • An, Jing-Long;Han, Tian;Yang, Bo-Suk;Jeon, Jae-Jin;Kim, Won-Cheol
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.12 no.10
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    • pp.799-807
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    • 2002
  • The vibration signal can give an indication of the condition of rotating machinery, highlighting potential faults such as unbalance, misalignment and bearing defects. The features in the vibration signal provide an important source of information for the faults diagnosis of rotating machinery. When additional training data become available after the initial training is completed, the conventional neural networks (NNs) must be retrained by applying total data including additional training data. This paper proposes the fault diagnostics algorithm using the ART-Kohonen network which does not destroy the initial training and can adapt additional training data that is suitable for the classification of machine condition. The results of the experiments confirm that the proposed algorithm performs better than other NNs as the self-organizing feature maps (SOFM) , learning vector quantization (LYQ) and radial basis function (RBF) NNs with respect to classification quality. The classification success rate for the ART-Kohonen network was 94 o/o and for the SOFM, LYQ and RBF network were 93 %, 93 % and 89 % respectively.

Design of Fault-Tolerant Node Architecture based on SCM in Optical Burst Switching Networks (광 버스트 스위칭 망에서 장애에 둔감한 SCM 기반의 노드 구조 설계)

  • Song Kyu-Yeop;Yoo Kyoung-Min;Yoo Wan;Lee Hae-Joung;Kim Young-Chon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.8B
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    • pp.514-524
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    • 2005
  • In optical burst switching(OBS) networks, the ingress edge router assembles packets in the same class queue into the appropriate size of burst. A burst control packet(BCP) is generated for channel reservation of corresponding data burst and sent earlier than the corresponding data burst with an offset time. Offset time is determined considering the number of hops from source to destination and the required quality of service(QoS). After offset time, the burst data is passed through tile pre-configured optical switches without any O/E/O conversion. But a failure in OBS networks may lead to the loss of bursts until the ingress nodes receive the failure indication signal. This results in a significant degradation in QoS. Therefore, in this paper, we propose a fault-tolerant node architecture based on sub-carrier multiplexing to reduce the effects of failure in OBS networks. The Performance of the proposed fault-tolerant node architecture exhibits considerable improvement as compared with the previous ones.

The analysis for malfunction of elevator equipment by instantaneous power quality (순시전원품질 변화에 딱른 엘리베이터의 오동작에 관한 분석)

  • Kim, Gi-Hyun;Kim, Chong-Min;Yi, Geon-Ho;Kim, Sun-Gu;Yoon, Sang-Wook
    • Proceedings of the KIEE Conference
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    • 2006.05a
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    • pp.34-36
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    • 2006
  • The number of confine-disease of elevator increases every year and then sudden rise, sudden stop, error of level indication, stand; those can bring to uneasiness of elevator passenger and malfunction accidents related life accident are increasing. For confirmation those malfunction accident, we are measuring and analyzing power quality(Sag, Interruption, Harmonic) of the actual site and evaluated the performance for stop and stating by testing the two imitation test equipment with EN12016(2004) standard level. This paper will be used data of the analysis for mutual relation between Power Quality and malfunction and fault of elevator.

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The research of the Technology Development of the Test Equipment of the Rolling Stocks (철도차량 검수 시험설비에 관한 기술개발 연구)

  • Song Moon-Shuk;Kim Moon-Ki
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.97-102
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    • 2005
  • As the railroad-base is an important factor to maintenance the rolling stocks, it is essential to improve the current problems of the environment pollution, nose, vibration, welfare, work condition and to applicate the performance betterment cases to the new base construction and pre-base maintenance. When the new base construction and pre-base maintenance is proceeded, it is necessary to construct the optimized system which includes the user's opinions enough to prevent the waste of the budget ,in that some part of the budget is spent to improve convenience, work condition, and the fault of base system after the construction. Therefore, this research intends to present the problem of the pre-constructed facilities, the testing operators' opinions, the analysis and the investigation of facilities' improvement, thorough the indication of provisions and the analysis of the result of the survey of testing operators.

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A Study on Heat-Flux Evaluation for Cable Fire Including Diagnostic Methodology for Degradation in Nuclear Power Plants (원전 케이블 화재 열속평가 및 열화 진단방법에 관한 연구)

  • Lim, Hyuk-Soon;Kim, Doo-Hyun
    • Journal of the Korean Society of Safety
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    • v.26 no.2
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    • pp.20-25
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    • 2011
  • The fire event occurred in fire proof zone often causes serious electrical problems such as shorts, ground faults, or open circuits in nuclear power plants. These would be directed to the loss of safe shutdown capabilities performed by safety related systems and equipments. The fire event can treat the basic design principle that safety systems should keep their functions with redundancy and independency. In case of a multi-core cable fire, operators can not perform their mission properly and can misjudge the situation because of spurious operation, wrong indication or instrument. These would deteriorate the plant capabilities of safety shutdown and make disastrous conditions. In this paper, the characteristic of cable fire is investigated and the heat-flux evaluation for cable fire is studied. Moreover, a diagnostic methodology for degraded cable in nuclear power plants is presented.

Long-term Power System Operational Strategy in Korea : Experience And Perspectives during Electric Industry Restructuing Period (한국의 중장기 전력계통 운영 방안에 관한 고찰)

  • Kim, Jin-Yi;Lee, Jo-Lyeon;Kang, Myung-Jang
    • Proceedings of the KIEE Conference
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    • 2002.11b
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    • pp.134-136
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    • 2002
  • In April of 2000, the Korea Power Exchange(KPX) was introduced into Korea electricity market. The purpose of this paper is to describe how the system operator indicates operational risks between the transmission planning and the supply and demand growth to make the market "work" and manage the power system in real time. This paper describes the experiences of kpx about the indication of operational risks including, for example, contingency analysis, voltage profile and fault capacity of three-phase short current.

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