• 제목/요약/키워드: Switching Surge

검색결과 159건 처리시간 0.038초

345kV 지중 및 혼합 송전계통에서의 개폐 과전압 해석 (Analysis of Switching Overvoltage in 345kV Underground and Combined Transmission Systems)

  • 정채균;이종범;강지원
    • 대한전기학회논문지:전력기술부문A
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    • 제52권12호
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    • pp.713-721
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    • 2003
  • This paper analyzes the switching overvoltage occurred on 345kV underground power cable system as well as combined transmission system using EMTP. Cable length and closing time, preinsertion resistance have effect on switching overvoltage. Therefore, this paper analyzes the switching overvoltage occurred on conductor and sheath with change of those parameters. Specially, the cross bonding position becomes discontinuity point because of the difference between surge impedance of metal sheath and that of lead cable. Thus, the transmission and the reflection of traveling wave complexly occur at this connection point. According to these influences, voltage between sheath and earth as well as voltage between joint boxes rise. Time to crest point of switching overvoltage is longer than lightning overvoltage. Even though the voltage induced by switching surge is smaller than lightning surge, that voltage may have serious effect on the metal sheath. Therefore, this paper also analyses the reduction effect of switching overvoltage when the preinsertion resistance of circuit breaker is considered.

고압전동식용 진단차식기의 스위칭써지 해석 및 연구 (A Study on the Reduction Method and the Analysis of VCB Switching Surge for High Voltage Induction Motor)

  • 이은웅;김종겸;김택수;이성철
    • 대한전기학회논문지
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    • 제43권5호
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    • pp.761-769
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    • 1994
  • VCB (Vacuum Circuit Breaker), with the strong arc extinction capability in switching the source of an induction motor, occurs the severe switching surge voltage which can cause the breakdown or the deterioration of motor insulation. Therefore, a method which reduces surge voltage across motor windings is necessary. So, it is analyzed that fast-rise-time surges resulting from VCB switching operations give rise to severe voltage stress on turn insulation. Additionally, the switching surge simulation algorithms using EMTP are developed, and C, R values of surge suppressor minimizing the steep-fronted stress in winding insulation surges are calculated.

인버터 구동 고압 유도전동기의 케이블 포설시 스위칭 써지 특성 분석 (Analysis on the Switching Surge characteristic of Cable Pulling of High-Voltage Induction Motor Fed by Inverter)

  • 권영목;김재철;송승엽;신중은
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 추계학술대회 논문집 전력기술부문
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    • pp.63-65
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    • 2004
  • The recent advancement in the power electronic technique has increased the use of induction motor fed by inverter using high-frequency switching devices. Also the tendency is toward larger size and higher voltage. Therefore, The IGBT (Insulated-Gate Bipolar Transistor) that is high switching frequency element has been using increase. But, The switching surge voltage was occurred by high switching frequency of inverter has appeared a voltage doubling in the motor input terminal due to mismatching of cable characteristic impedance and motor characteristic impedance. Actually, The Switching surge voltage became the major cause to occur the insulation failure by serious voltage stress in the stator winding of induction motor. The short during rise time of switching surge and cable length is increased, the maximum transient voltage seen at the motor terminals increases. In this paper, Analyzed switching surge transient voltage of power cable pulling is used EMTP(Electromagnetic Transient Program) at the induction motor terminal and in cable.

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스위칭에 의한 전동기 써지전압 분포 (The Analysis of Surge distribution for motor by Switching)

  • 김종겸;이은웅;조현길;백두현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 A
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    • pp.115-117
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    • 1996
  • The electrical stress, which is generated by switching devices, has been affected by various kinds of factors such as surge impedance, motor capacity, surge wavefront and so forth. In this study, the surge phenomenon delivered into motor winding in switching was analyzed with actual system.

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고압전동기용 진공차단기의 스위칭 써지를 저감시키는 써지흡수기의 적정치 선정과 써지측정 (The Selection of Appropriate Surge Absorber Value Reducing the Switching Surge of VCB for High Voltage Motor and Surge Measurement)

  • 김택수;이성철;이은웅;김종겸
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1994년도 하계학술대회 논문집 A
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    • pp.100-102
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    • 1994
  • VCB, with its big arc extinction in very short switching time, produces the high switching surge voltage which may cause the breakdown of motor insulation or acceleration of insulation deterionation. To protect motor winding insulation, we developed the computer algorithm for simulating the surge occurred in VCB by EMTP. And we established the effect of the C-R surge absorber by the surge measurement in the motor-VCB circuit.

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

  • 이복희;신건진;박희열;엄상현;김유하
    • 조명전기설비학회논문지
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    • 제27권5호
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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.

EMTP를 이용한 유도전동기의 스위칭 써지 영향 분석 (The analysis for the effect of switching surge of induction motor using EMTP)

  • 송승엽;김재철;이도훈;신중은;노광현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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    • pp.278-280
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    • 2003
  • As the use of ASD due to developing of power electronics technology was increased, the failure of induction motor by switching surge also was increased. This paper presented a switching surge modeling of inverter and a induction motor modeling using EMTP program. As a output waveform of square wave inverter and PWM inverter and the input terminal waveform of induction motor were shown, the effect of switching surge was analyzed.

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EMTP를 이용한 인버터 구동 고압 유도전동기의 스위칭 써지 특성 분석 (The Analysis on the Switching Surge of High-voltage Induction Motor fed by Inverter Using EMTP)

  • 송승엽;김재철;신중은;권영목;황돈하
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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    • pp.58-62
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    • 2004
  • The PWM inverter drive my cause motor terminals voltage surge and oscillation(ringing), which impose severe electric stresses on inter-turn insulation of motor windings. This paper describes the technique used to simulate the problems associated with the use of PWM ASD's(Adjustable Speed Drive) to drive induction motor. The characteristic of switching surge was analyzed by EMTP(Electromagnetic transient program) model. The effects of switching surge by surge impedance, rise-time and cable lengths are also discussed.

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새로운 액티브 보조 공진 DC 링크 스너버를 이용한 3상 전압형 소프트 스위칭 인버터의 특성 (Characteristic of Three-Phase Voltage Type Soft-Switching Inverter using the Novel Active Auxiliary Resonant DC Link Snubber)

  • 성치호;허영환;문상필;박한석
    • 전기학회논문지P
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    • 제65권2호
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    • pp.114-121
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    • 2016
  • This paper is Instant space vector PWM(Pulse Width Modulation)power conversion devices in switching power semiconductors from my generation to losses and switching when the voltage surge and current surge of electronic noise(EMI: Electro Magnetic Interference / RFI: Radio Frequency Interference)to effectively minimize the power soft-switching power conversion circuit topologies of auxiliary resonant DC tank for the purpose of high performance realization of the electric power conversion system by the high-speed switching of a semiconductor device(AQRDCT simultaneously : an active auxiliary resonance using auxiliary Quasi-resonant DC tank)DC link snubber switch has adopted a three-phase voltage inverter. AQRDCL proposed in this paper can reduce the effective and current peak stress of the power semiconductors of the auxiliary resonant snubber circuit compared to the conventional active-resonant DC link snubber, it is not necessary to install the clamp switch of the auxiliary resonant DC link, DC the peak current and power loss of the bus line can be reduced.

송전급 피뢰기용 ZnO 바리스터 소자의 전기적 특성 (Electrical Characteristics of ZnO Varistor for Transmission Class Arrester)

  • 김석수;박춘현;조이곤;박태곤
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 춘계학술대회 논문집 반도체 재료 센서 박막재료 전자세라믹스
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    • pp.179-182
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    • 2004
  • ZnO varistor for transmission class arrester$({\Phi}65{\times}20mm)$ of 10kA(Class 3) grade was recently developed in korea and is tested for the properties by switching surge operating duty test to know the line discharge class and complex surge property in electric properties. To find out changing rate of residual voltage before and after lightning impulse residual voltage testing, the sample is cool to room temperature after finishing switching surge operating duty test, and the rate is good as 1.0~1.7%. The element had been considered as applicable ZnO varistor for electricity transmission from the test results of state conterl, switching surge operating duty, thermal stability and above test. But various test should be required for actual application because this is a part of the to be needed for application.

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