• Title/Summary/Keyword: CBEMA Curve

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Power Quality Index and Cost based on Load-Voltage Characteristics (부하의 전압특성을 고려한 모선별 전력품질 지표 및 가격 산정기법)

  • 이근준
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.4
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    • pp.213-218
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    • 2003
  • In front of the opening of electric distribution market in 2004, it is indispensable to have a proper estimation of power quality index and rower quality cost calculation mechanism which are indispensable to stabilize highly industrialized society and to vitalize the Investment lot electric power system. However, there were not enough measures to reflect the voltage characteristics such as voltage sags and Interruptions which make electric load in unstable operation. This paper suggests power quality index and power quality cost which translate various kinds of voltage records into bus load drop index(BLDI) and bus power quality cost(BPQC) based on aggregated load CBEMA curve. A sample calculation result shows that this method can produces the acceptable power Quality index and costs for utilities and customers requirements.

The Service Voltage Measurement and Analysis while TTX Runs (틸팅열차 운행 중 가선전압 계측 및 분석연구)

  • Lee, Su-Gil;Kang, Chul;Her, Jae-Sern;Kim, Jae-Chul;Lim, Jae-Chan
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.12
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    • pp.58-65
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    • 2009
  • Recently, the Korea Tilting Express(TTX), "HANVIT 200", KRRI(Korea Railroad Research Institute) developed runs for test on the conventional railroad, Honam line, Center line, Chunk-buk line and Tae-baek line. In this paper, we measured the service voltage while TTX ran on the conventional railroad and analyzed the condition of voltage. For measuring voltage directly, we installed PT under the pantograph and measured the voltage of the primary winding. In addition, we record situations that other trains pass by TTX and environments while TTX ran. And then we analyzed the condition of voltage using the records and CBEMA curve. In result, over 110[%] voltage of rated voltage(25[kV]) often occurred and the voltage of some place continued over 110[%] for about 200[s]. Especially, the voltage condition of Tae-baek line is the worst. The results in this paper can help to stabilize the power device and power converter of TTX.

Customer's Effects of Momentary Voltage Sag in Power Distribution System Considering Reclosing Interval (리클로징 시간을 고려한 배전계통 순간전압강하의 수용가측 영향)

  • Moon, Jong-Fil;Kim, Jae-Chul;Kang, Bong-Seok;Yun, Sang-Yun
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.36-38
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    • 2003
  • In this paper, It was evaluated that the customer's effects of momentary voltage sag in power distribution system considering reclosing interval. Above all, power quality problems were discussed widely, various international standards about power quality were compared to each other. after the continuous voltage sag waves of power distribution system on fault were induced, the experimentation about voltage sag for critical load was performed using source simulator. The results of experimentation were displayed as the form of 2 and 3-dimensional CBEMA Curve.

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Reassessment of SMES Application Studies and Systematic approach Method under Deregulation (전력계통 제어용 초전도에너지 저장장치(SMES)의 검토사례 분석과 전력시장에서의 적용방안)

  • Lee, Geun-Joon;Yoon, Y.B.;Hwang, S.D.
    • Proceedings of the KIEE Conference
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    • 2003.11a
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    • pp.54-56
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    • 2003
  • With the advancement of superconductor materials, especially in HTC YBCO(Gen II), the feasibility of SMES in power systems become much higher than previous days application[1]. Also, with the de-regulation of electricity market, it is indispensable to have a proper estimation of power quality index and power quality cost calcluation mechanism to stabilize highly industrialized society and to vitalize the investment for electric power system. This paper suggests a comprehensive algorithm[2] to determine the policy of SMES investment with the PQ Indices[3] based on aggregated load CBEMA curve reflecting the voltage characteristics such as volatge sags and interruptions which make electric load in unstable operation.

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Assessing the Effect of Voltage Sag in Distribution System using Reliability Data (신뢰도 데이터를 이용한 배전계통의 순간전압강하 영향평가)

  • Yun, Sang-Yun;Kim, Jae-Chul;Lim, Seung-Jung;Oh, Jung-Hwan;Kim, Du-Bong;Han, Byung-Duk;Kim, Gi-Hyun
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.282-285
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    • 1998
  • This paper presents a method to evaluate the effect of voltage sag in distribution system using the component reliability data of utilities. The proposed method is based on Specified CBEMA curve which is the probability curve of the customers' effect by voltage sag. We carried out the experiment for the customers' sensitive equipments using the test facilities in KERI. The Monte Carlo method and the historical reliability data in KEPCO are used for simulations.

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The study on characteristics of operating limit of electric machine under the effects of Sag (순간전압강하에 대한 저압전기기기의 운전특성에 관한 연구)

  • Lee, Hyun-Chul;Gim, Jae-Hyeon;Jung, Sung-Won;Lee, Geun-Joon
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.113-114
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    • 2008
  • For the supported high-technology, it is in need of estimation about power quality and reasonable price through machinism. The power system made much of precision digital industrial damage under sag. This study suggested electric machine under effects of power quality in the theory and test. A electric machine was simulated and experimented about sag. The test system made up IPC as voltage sag device. The test machine was magnetic contactor and PLC. The result, electric machines appeared to influence sag with CBEMA curve. It was make possible analysis of power system about a fault. This study was expected to method that investment and development of equipment on power market in the future.

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A study on the characteristics of operating limits of High-Pressure discharge lamps during Voltage Sag (Voltage Sag에 의한 고압 방전등의 운전한계 특성 연구)

  • Jeong, Sung-Won;Hwang, Keon-Ho;Lee, Hyun-Chul;Lee, Geun-Joon;Gim, Jae-Hyeon
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.37-40
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    • 2008
  • This paper presents the results of a simulation to analyze the effects of voltage sag on high-pressure discharge lamp(400[W]). In this paper, voltage sag is considered a reduction between 0 and 0.9[p.u] in nominal voltage magnitude, with duration between 0.01 and 90cycle. The simulation results depict the characteristics of the lamp about operating limits during voltage sag by the magnitude and duration of sag in CBEMA curve.

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Bus Power Quality Index and Cost based on Load-Voltage Characteristics (부하의 전압특성을 고려한 모선별 전력품질 지표 및 가격 산정기법)

  • Lee, Geun-Joon;Heydt, G.T.
    • Proceedings of the KIEE Conference
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    • 2002.11b
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    • pp.9-14
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    • 2002
  • In front of the opening of electric distribution market in 2004. it is indispensable to have a proper estimation of power quality index and power quality cost calculation mechanism are indispensable to stabilize highly industrialized society and to vitalize the investment for electric power system. However, there were not enough measures to reflect the voltage characteristics such as voltage sags and interruptions which make electric load in unstable operation. This paper suggests power quality index(LDI) and power quality cost(LDC) which translate various kinds of voltage records into load drop index and cost based on aggregated load CBEMA curve. A sample calculation result shows that this method can produces the acceptable power quality index and costs for utilities and customers requirements.

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A Dynamic Characteristics on Non-linear Voltage Electric Equipment under Voltage Sag (순간전압강하에 대한 비선형 저압전기기기의 동적특성)

  • Lee, Hyun-Chul;Jeong, Sung-Won;Gim, Jae-Hyeon;Lee, Geun-Joon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.3
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    • pp.336-343
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    • 2008
  • In this study, a transition of power quality was characterized by non-linear voltage electric equipments under voltage sag. The test was inputted voltage sag to IPC(Sag Generator) from AVR, and then to equipments by IPC which adjust voltage magnitude and duration. The load test which non-linear voltage electric equipments used PLC, Magnetic Contactor, SMPS, HID Lamp. The test result was different from each other according to a manufacturing companys, models, and equipments. PLC was greatly described to be stabilized voltage sag in case of no load then rated load. Magnetic Contactor was made a difference to phase angles on voltage sag, which was $0^{\circ}$, $30^{\circ}$, $60^{\circ}$, $90^{\circ}$. HPD Lamp was described to be stabilized the sodium lamp, and to be unstabilized the metal hailed lamp. The test result was showed CBEMA curve that stand for evaluated responsiveness of voltage sag. This study was tested description to dynamic characteristics on non-linear voltage electric equipment under voltage sag. There was hoped that power system designed the essential particulars.

An Assessment Method for Voltage Sag in Power Distribution System using a Fuzzy Model (퍼지 모델을 이용한 배전 계통에서의 순간전압강하 평가 방식)

  • Yun, Sang-Yun;O, Jeong-Hwan;Kim, Eon-Seok;Kim, Nak-Gyeong;Kim, Jae-Cheol
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.49 no.4
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    • pp.177-184
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    • 2000
  • In this paper, we proposes a method for assessing the effect of voltage sag in power distribution systems using fuzzy model. The proposed method is based on the reliability data of distribution system and specified computer business equipment manufacturer association(SCBEMA) curve that express the representative power acceptability curve by voltage sag for each customer type. The SCBEMA curves are made by using the CBEMA curves obtained from the experiment for the customers sensitive equipment. In order to transform SCBEMA curves to the differential damage by voltage sag, a fuzzy model is used. The proposed fuzzy model is composed to reflect two parameters of customers damage by voltage sag. One is the duration and magnitude of voltage sag and the other is the different risk due to the customer types. The Monte Carlo simulation method and the historical reliability data in KEPCO ae used for case studies.

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