Electrical Safety Research Institute

Korea, South Korea

Electrical Safety Research Institute

Korea, South Korea
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Kim J.-J.,Electrical Safety Research Institute | Jeon J.-C.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

This paper proposes a portable cable fault detection system with automatic fault distinction and distance measurement using time-frequency correlation and reference signal elimination method and automatic fault classification algorithm in order to have more accurate fault determination and location detection than conventional time domain refelectometry (TDR) system despite increased signal attenuation due to the long distance to cable fault location. The performance of the developed system method was validated via an experiment in the test field constructed for the standardized performance test of power cable fault location equipments. The performance evaluation showed that accuracy of the developed system is less than 1.34%. Also, an error of automatic fault type and location by detection of phase and peak value through elimination of the reference signal and normalization of correlation coefficient and automatic fault classification algorithm not occurred. © The Korean Institute of Electrical Engineers.


Jeon J.-C.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

Every year, lives are lost due to electrical safety accidents that could have been prevented with proper education and awareness of electrical safety. To prevent such accidents, experiential education is more effective than indoctrination education. This paper describes the electrical safety education system based on virtual reality (VR) and evaluates effect of the proposed system. Users operated the experiential electrical safety education system, and they were provided electrical stimulation in an electric shock experience using a haptic device. Appropriate stimulation values were calculated according to age (children vs. adults) and gender through experiment. The scenario in which participants experience electrical safety in the home environment was structured, and related educational contents was produced. A total of 68 healthy elementary students evaluated the educational effect of the system. The results showed that the educational effect and the sustainability of effect of the proposed system are superior to those of existing multimedia learning methods. By implementing electrical safety education stimulating the senses of human, the learning effect was promoted and this experiential education would be able to prevent electrical accidents. © The Korean Institute of Electrical Engineers.


Jeon J.-C.,Electrical Safety Research Institute | Kim J.-J.,Electrical Safety Research Institute | Choi M.-I.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

This paper proposes an improved spread spectrum time domain reflectometry (ISSTDR) using time-frequency correlation and reference signal elimination method in order to have more accurate fault determination and location detection than conventional (SSTDR) despite increased signal attenuation due to the long distance to cable fault location. The proposed method has a two-step process: the first step is to detect a peak location of the reference signal using time-frequency correlation analysis, and the second step is to detect a peak location of the correlation coefficient of the reflected signal by removing the reference signal. The proposed method was validated through comparison with existing SSTDR methods in open- and short-circuit fault detection experiments of low voltage power cables. The experimental results showed that the proposed method can detect correlation coefficients at fault locations accurately despite reflected signal attenuation so that cable faults can be detected more accurately and clearly in comparison to existing methods. Copyright © The Korean Institute of Electrical Engineers.


Jeon J.-C.,Electrical Safety Research Institute | Kim T.-H.,Electrical Safety Research Institute | Yoo J.-G.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2015

This paper proposed an Spread Spectrum Time Domain Reflectometry (SSTDR) using time-frequency correlation analysis in order to have more accurate fault determination and location detection than classical SSTDR despite increased signal attenuation due to the long distance to cable fault location. The proposed method was validated through comparison with classical SSTDR methods in open-and short-circuit fault detection experiments of low-voltage power cables. The experimental results showed that the proposed method can detect correlation coefficients at fault locations accurately despite reflected signal attenuation so that cable faults can be detected more accurately and clearly in comparison to existing methods. Copyright © The Korean Institute of Electrical Engineers.


Jung H.-Y.,Electrical Safety Research Institute | Yoo S.-B.,Electrical Safety Research Institute | Lee K.-C.,Electrical Safety Research Institute | Lee C.-J.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2015

As the increasing national power crises due to various environmental factor, power market change is needed more developed and systemized DSM(Demand Side Management) search at DR market. To overcome national power crisis outbreaking every year and manage the eletric power reserve ratio, we need to construct and develop the electric safety manager and general public main oriented national power plant. For the advanced national power demand management system, it is required the application development like OpenAPI, Big Data Acquisition, Web/APP basd on ICT. Copyright © The Korean Institute of Electrical Engineers.


Kim T.-H.,Electrical Safety Research Institute | Jeon J.-C.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

This paper proposes a diagnosis to detecting poor contact fault and fault location. Electrical fire by poor contact fault of power cable occupied a large proportion in the total electrical installations. The proposed method has an object to prevent electrical fault in advance. But detecting poor contact fault is difficult to detect fault type and fault location by using conventional reflectometry due to faults generated intermittently and repeatedly on the time change. Therefore, in this paper poor contact fault and fault conditions were defined. System generating poor contact fault produced for the experimental setup. SSTDR and algorithm of reference signal elimination heighten performance detecting poor contact fault on live power cable. The diagnosis methods of signal process and analysis of reflected signal was proposed for detecting poor contact fault and fault location. The poor contact fault and location had been detected through proposed diagnosis methods. The fault location and error rate of detection were verified detecting accuracy by experiment results. Copyright © The Korean Institute of Electrical Engineers.


Moon W.-S.,Soongsil University | Kim J.-C.,Soongsil University | Jo A.,Soongsil University | Bang S.-B.,Electrical Safety Research Institute | Ko W.-S.,HETCO Inc.
2014 IEEE Industry Application Society Annual Meeting, IAS 2014 | Year: 2014

Unintentional arc faults, caused from damaged power line cords and loose connections, can start a serious fire and safety hazard in residential areas. The arc fault circuit interrupter (AFCI) is beginning to emerge as a product to protect against the arc that may cause fire. In this paper, we analyze ignition characteristics depending on the magnitude of load current when series arc occurs. Also, we suggest the suitable arc clearing time based on characteristic analysis in Korean residential electric environment. To do this, we have tested the carbonized path arc clearing time test using ultraviolet signal detecting system according to the test method of UL 1699. As wire specimen in those experiments, we used the heat resistant indoor PVC insulated (HIV) wire which is a kind of residential electric wire. © 2014 IEEE.


Moon H.-W.,Electrical Safety Research Institute | Lim Y.-B.,Electrical Safety Research Institute | Kim D.-W.,Electrical Safety Research Institute | Lee S.-I.,Electrical Safety Research Institute | Choi M.-I.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

Electrical disasters have not been greatly reduced despite continuous prevention efforts until now. However, the smart distribution board which can be measured information about general electrical condition such as current, voltage, power, power factor etc. and electrical safety condition such as over-current, leakage current, arc etc. and communicated analysis information about electrical condition with server will be helpful for the prevention of electrical disasters through real-time surveillance and data analysis under smart grids based on the two-way communication. In this paper, the proposal standard of smart distribution board for electrical safety is suggested about the structure, functional requirements of compositions, communication, security and so on. Copyright © The Korean Institute of Electrical Engineers.


Kim D.-W.,Electrical Safety Research Institute | Lim Y.-B.,Electrical Safety Research Institute | Lee S.-I.,Electrical Safety Research Institute | Choi M.-I.,Electrical Safety Research Institute | Moon H.-W.,Electrical Safety Research Institute
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

This paper presents protection techniques against electric shock in low voltage DC (direct current) grounding systems depending on the analysis of earth fault current paths. Firstly, the comparison between alternating current and direct current on human was conducted, and current threshold values for each current path and for long duration were analyzed. Secondly, the analyses of the earth fault current flows were performed depending on the grounding types and earth fault conditions. Lastly, based on these analyses, adequate protection measures of electric shock depending on low voltage DC grounding types were provided. Copyright © The Korean Institute of Electrical Engineers.


Kim H.-S.,Electrical Safety Research Institute | Kim K.-H.,Kangwon National University
Transactions of the Korean Institute of Electrical Engineers | Year: 2014

In the last couple of decades industrialization and technological development has not only increase in the scale of electrical facilities and it has become more and more complicated and diversified. Furthermore, fires in the electrical transformers, like those that have knocked out power in the country in the past years, are likely to become more common as utility systems begin to show their age. The importance of preventing electrical accidents can never be overemphasized and for this reason, supply of on-line diagnosis system combining information and communication technology(ICT) for the customer's electrical facilities has been increasing recently. The major advantage of on-line diagnosis system is that the device's potential problems could be detected early before a serious deterioration or breakdown occurs. In this paper, We estimated the benefit from the investment in the right of present value of sales, success rate of commercialization regarding R&D investment for development and commercialization of on-line diagnosis technology targeting customer electrical facilities. As a result, the net value added of 29.7 billion won and the increased profit by roughly 7.52 precent are expected.

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