• Title/Summary/Keyword: Ground Fault Current Distribution

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Development of Fault Detection Algorithm on distribution lines using neural network & fuzzy logic (신경 회로망-퍼지로직을 이용한 배전선로 사고 검출 기법의 개발)

  • Choi, J.H.;Jang, S.I.;Eom, J.P.;Park, J.S.;Kim, K.H.;Kim, N.H.;Kang, Y.S.
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1440-1443
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    • 1999
  • This paper proposes fault detection method using a neural network & fuzzy logic on distribution lines. Fault on distribution lines is simulated using EMTP. The pattern of high impedance fault on pebbles, ground and short-circuit fault were take as the learning model. In this paper proposed fault detection method is evaluated on various conditions. The average values after analyzing fault current by FFT of even odd harmonics and fundamental rms were used for the neural network input. Test results were verified the validity of the proposed method

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Development of Fault Detection and Classification Method in Distribution Lines (신경회로망을 이용한 배전선 사고 검출 기법의 개발)

  • Kim, K.H.;Choi, J.H.;Chang, S.I.;Kang, Y.C.;Park, J.K.
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1114-1117
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    • 1998
  • Recent applications of neural networks to power system fault diagnosis have provided positive results and have shown advantages in process speed over conventional approaches. This paper describes the application of neural network to fault detection and classification in distribution lines using the fundamental component, 2-5th harmonics index, even and odd harmonics index, and zero phase current. The Electromagnetic Transients Program (EMTP) is used to obtain fault patterns for the training and testing of neural networks. The proposed fault detection and classification method in distribution lines is obtained by analysing the difference among normal, HIF, ground fault, short circuit fault condition.

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A Study on the Protection System for AT Feeding on the Electric Railway (전기철도 AT급전방식 보호시스템 최적구성 방안 연구)

  • 창상훈;이형수;홍재승;김정훈
    • Proceedings of the KSR Conference
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    • 1999.11a
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    • pp.344-351
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    • 1999
  • The safe operation of electro railways is greatly dependant on its protective systems. The system so-called Fault Protection Wire(FW) is now widely adapted to protect in AT feeding systems. It is connected between the feeder and trolley circuit to return the fault current to autotransfonmers at substation. This paper computed the distribution of fault currents at FW in the system and also evaluated the safety from electric shock when ground fault or flashover occur in the feeding system. The results show FW is useful to protect power supply network from fault in electric railways

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Evaluation of Operation Practicality on Line with Aluminum Conductor in Underground T&D Systems (지중송전 및 배전계통에서 알루미늄 도체 선로운용의 실용성 평가)

  • Jang, Ju-Yeong;Lee, Jong-Beom;Kim, Yong-Kap
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.3
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    • pp.492-499
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    • 2011
  • This paper describes that the evaluation on operation practicality of Al conductor cable will be used instead of Cu conductor cable. Analysis is divided into two kinds of cases as transmission and distribution. To evaluate that Al conductor line has the insulation strength indeed safely, various analysis and calculation such as single line-to-ground fault current, lightning surge and allowance current were carried. Model was established based on real combined transmission and distribution is being used in utility with EMTP. The analysis results on Al and Cu conductor line were compared each other. It was proved that Al conductor line can be operated instead of Cu conductor line without special insulation problem in transmission and distribution, in electrical view point such as overvoltage and allowance current.

Analysis of system influence according to the insertion of the Fault Current Limiter (배전계통에서 상전도 한류기 투입에 따른 계통영향 평가)

  • Oh, Chang-Wook;Bang, Seung-Hyun;Rhee, Sang-Bong;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.2279-2280
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    • 2008
  • When electric power systems expand and become more interconnected, the fault current levels increase in the distribution system. Therefore, we studied the influence of the power system according to application of a resistive FCL. In this paper, the distribution system and the resistive FCL were modeled by using EMTP (Electromagnetic Transients Program), which simulates the effect of the resistive FCL for the single line ground fault in distribution system.

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Characteristics of the Switching Surge Voltages Induced at Metal Flexible Conduits Due to Ground Faults (지락고장에 의해 금속제 유연전선관에 유도된 개폐서지전압의 특성)

  • Lee, Bok-Hee;Shin, Gun-Jin;Park, Hee-Yeoul;Um, Sang-Hyun;Kim, You-Ha
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.5
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    • pp.74-80
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    • 2013
  • This paper presents the transient behavior of the switching surge voltages generated by interruption of DC ground fault currents flowing through metal flexible conduits. All fault circuits consist of line parameters such as resistance, inductance, capacitance and conductance. The use of nonmagnetic metal conduits should be taken into account in order to reduce the inductance of battery charger distribution circuits. The frequency-dependent circuit parameters of metal flexible conduits were measured. The switching surge voltages generated at the ground fault circuit consisted of steel-galvanized alloy and aluminium conduits were investigated. As a result, the impedances of metal flexible conduits are significantly increased over the range of the frequency above 10 kHz and the switching surge voltages generated along aluminium flexible conduit are lower than those along steel-galvanized alloy conduit when DC fault current is interrupted.

An Improved Method of Faulted Section Identification Algorithm in Distribution Automation System (배전자동화시스템에서 단말장치의 고장표시 정보 생성 알고리즘 개선 방법)

  • Lim, Il-Hyung;Lim, Seong-Il;Lee, Seung-Jae;Kwon, Sung-Chul;Shin, Chang-Hoon;Ha, Bok-Nam;Choi, Myeon-Song
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.4
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    • pp.651-659
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    • 2007
  • This paper proposes an improved fault indication algorithm in a distribution automation system. A conventional fault indication method, so called YES-NO algorithm, could generate wrong informations under certain conditions such as line to ground fault, large motor double circuit line. In order to prevent mal-operation of fault indicator, direction of fault current are used as well as magnitude. The feasibility of the proposed algorithm has been testified by computer simulation using Matlab power system toolbox.

DSP based Real-Time Fault Determination Methodology using Artificial Neural Network in Smart Grid Distribution System (스마트 그리드 배전계통에서 인공신경회로망을 이용한 DSP 기반 실시간 고장 판단 방법론 기초 연구)

  • Jin-Eun Kim;Yu-Rim Lee;Jung-Woo Choi;Byung-Hoon Roh;Yun-Seok Ko
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.5
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    • pp.817-826
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    • 2023
  • In this paper, a fault determination methodology based on an artificial neural network was proposed to protect the system from faults on the lines in the smart grid distribution system. In the proposed methodology, first, it was designed to determine whether there is a low impedance line fault (LIF) based on the magnitude of the current RMS value, and if it is determined to be a normal current, it was designed to determine whether a high impedance ground fault (HIF) is present using Normal/HIF classifier based on artificial neural network. Among repetitive DSP module-based algorithm verification tests, the normal/HIF classifier recognized the current waveform as normal and did not show reclosing operation for the cases of normal state current waveform simulation test where the RMS value was smaller than the minimum operating current value. On the other hand, for the cases of LIF where RMS value is greater than the minimum operating current value, the validity of the proposed methodology could be confirmed by immediately recognizing it as a fault state and showing reclosing operation according to the prescribed procedure.

A Study on the Sequence Impedance Modeling of Underground Transmission Systems (지중송전선로의 대칭분 임피던스 모델링에 관한 연구)

  • Hwang, Young-Rok;Kim, Kyung-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.6
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    • pp.60-67
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    • 2014
  • Power system fault analysis is commonly based on well-known symmetrical component method, which describes power system elements by positive, negative and zero sequence impedance. The majority of fault in transmission lines is unbalanced fault, such as line-to-ground faults, so that both positive and zero sequence impedance is required for fault analysis. When unbalanced fault occurs, zero sequence current flows through earth and ground wires in overhead transmission systems and through cable sheaths and earth in underground transmission systems. Since zero sequence current distribution between cable sheath and earth is dependent on both sheath bondings and grounding configurations, care must be taken to calculate zero sequence impedance of underground cable transmission lines. In this paper, EMTP-based sequence impedance calculation method was described and applied to 345kV cable transmission systems. Calculation results showed that detailed circuit analysis is desirable to avoid possible errors of sequence impedance calculation resulted from various configuration of cable sheath bonding and grounding in underground cable transmission systems.

The Operational Characteristics of High-speed Interrupter by Fault Types (고장 유형별 고속 인터럽터의 동작 특성)

  • Jeong, In-Sung;Choi, Hyo-Sang;Jung, Byung-Ik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.2
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    • pp.278-283
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    • 2013
  • With the increasing power demands, size of the fault current in electrical grids is steadily increasing, and it exceeds the breaking capacity of circuit breakers. To effectively cope with these problems, a high-speed interrupter was suggested. The high-speed interrupter provides fault current with a bypass to a fault current limiter in case of accidents and consequently, fault current can be restricted. In this study, behavioral characteristics of high-speed interrupter were analyzed by accident types occurred in a distribution system. When accidents occurred, a and b contact of the high-speed interrupter were turned-off and then, turned-on. Accordingly, fault current flowed to the circuit connected to a current limiting element, and the fault current limiter restricted fault current to within a half-cycle. Nevertheless, the behavior of the high-speed interrupter was slowed down by a switching surge. As a result, fault current was confirmed to be restricted not to within the anticipated half-cycle, but to after a half-cycle. Moreover, the behavioral characteristics of the high-speed interrupter changed not only by accident types, but by behaviors of R, S, and T phases. This was due to the errors in stroke lengths of the high-speed interrupters, which resulted in a slight time discrepancy among three interrupters. In addition, the switching behaviors of the b and a contact were confirmed not to have coincided due to the switching surge; b contact behaved first and a contact followed. because of this, accuracy of stroke length and switching surges through the solenoid suction increases may be necessary to resolve.