• Title/Summary/Keyword: TRV(transient recovery voltage)

Search Result 26, Processing Time 0.025 seconds

Analysis on the Effects of TRV and MOV in Real System with TCSC (TCSC가 적용된 실계통 시스템에서의 TRV와 MOV의 영향에 대한 분석)

  • Lee, Seok-Ju
    • Journal of Korea Society of Industrial Information Systems
    • /
    • v.24 no.2
    • /
    • pp.41-46
    • /
    • 2019
  • The application of series compensator in a power system affects other devices such as circuit breakers transient recovery voltage (TRV) problem. In this paper, we analyze the TRV effect on a line circuit breaker in the cases with and without thyristor-controlled series capacitor (TCSC) via simulation, and suggest an effective method to overcome the increase of TRV due to the TCSC installation. It also discusses the impact of proposed protection on metal oxide varistor (MOV). A 345 kV transmission line in Korea was selected as a study case. Grid system was modelled using PSCAD (Power Systems Computer Aided Design) / EMTDC(Electro Magnetic Transient Direct Current). The TRV was analyzed by implementing a short circuit fault along the transmission line and at the breaker terminal. The proposed protection scheme, the TRV satisfies the standard. However, the MOV energy capacity increased as the delay time increased. This result can solve the TRV problem caused by the expected transmission line fault in a practical power system.

TRV Analysis for AC Filter Circuit Breaker in HVDC System (HVDC시스템에서 AC 필터 차단기의 TRV해석)

  • Kim, Chan-Ki;Kim, Jin-Young;Sin, Jin-Chul
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.20 no.4
    • /
    • pp.369-374
    • /
    • 2015
  • The circuit breaker in an electric power system is not operated when the voltage in the circuit breaker is higher than the rated transient recovery voltage (TRV). The TRV of a circuit breaker is characterized by re-ignition of the arc between two poles and determined by the value of connecting impedance. In this study, we simulated the peak value of TRV in the AC filter of the circuit breaker. The suitability of TRV is assessed by capacitive current switching test conditions defined by the international guide IEC62271-100.

A Study on the Circuit Breaker Transient Recovery Voltages on Large Commercial Customer using EMTP-RV Program (EMTP-RV를 이용한 대용량 전기설비의 차단기 TRV에 관한 연구)

  • Cho, Kyeh-Sool;Choi, Hong-Kyoo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.25 no.10
    • /
    • pp.59-66
    • /
    • 2011
  • In electric power system, the circuit breaker is not operated when the higher voltage then the rated TRV(transient Recovery Voltage) appeared in the circuit breaking, The TRV of a circuit breaker means the characteristics of reignition by the arc between two poles. and is decided by the value of connecting Impedance. In this paper we of carried out many kinds of experiments varying the types of bus, the types of installation, the length of installation between 22.9 [kV] level circuit breaker and MTR in general 154/22.9[kV] system, We also simulated the characteristics of TRV using EMTP-RV program. The suitability of TRV in assessed by Uc, RRRV(Rate of Rise of Recovery Voltage) which are defined by the international guide, IEC62271-100. The values of RRRV gained from the cable-made bus are 590[%] lesser than those from the NSPB-made bus respectively. So the triangled type is more rational in the aspect of TRV.

22.9kV GIS Modeling and Transient Recovery Voltage Analysis Using EMTP/RV (EMTP/RV를 이용한 22.9kV GIS 모델링과 과도회복전압 해석)

  • Jyung, Tae-Young;Baek, Young-Sik;Jeong, Ki-Seok;Park, Ji-Ho;Seo, Gyu-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.59 no.7
    • /
    • pp.1199-1205
    • /
    • 2010
  • The recent power system is required to a large size of facilities and high power technology according to increasing power demand. However, it could lead to spoiling the beauty of city and environment problem. The miniaturized facilities with large capacity such as GIS have been required in recent power system. The GIS(Gas Insulated Substation) using the SF6 insulation gas enables to miniaturize facilities with large capacity with high insulation performance. However, the substation installed GIS has required to new design model which is different from the conventional substation. The TRV(Transient Recovery Voltage) analysis on simple circuit may applied by differential equation. However, in case of relatively complicated system, EMTP(Electro Magnetic Transients Program) mainly has been used to design and simulate for transient analysis. This paper mainly design the 22.9 kV GIS system and analyze the transient recovery voltage of main circuit breaker using EMTP/RV. It also enables to easily design the other substation installed GIS with same maker and voltage level because the proposed GIS model consists of separated modules such as busbar, circuit breaker, bushing, CT, PT etc. Eventually, it contributes to comfortably compare the interrupting performance of circuit breaker and system TRV corresponding to the substation system configuration.

A Study on the TRV(BTF) of Circuit Breakers According to Install Current Limit Reactors (345kV 고장전류 저감을 위한 한류리액터 설치시 차단기 TRV(모선 고장시) 검토)

  • Kwak, J.S.;Park, H.S.;Shim, E.B.;Ryu, H.Y.;Lee, B.H.
    • Proceedings of the KIEE Conference
    • /
    • 2005.07a
    • /
    • pp.368-370
    • /
    • 2005
  • Due to the tendency towards large capacity and complexity of power system, an enhancement of power system equipment make a system impedance to be low in power system. Generally if an equivalent impedance of system becomes lower, a system stability will be better. But the fault current becomes very larger. The 345kV ultra-high voltage system will use current limit reactors(CLR) in a transmission line or a bus in substation to limit the magnitude of fault current. The CLR makes a significant contribution to the severity of the transient recovery voltage(TRV) experienced by feeder and bus circuit breakers on clearing feeder faults. Based on the conclusions of an investigation of actual circuit breaker failures while performing this duty, the mitigation of the transient recovery voltage associated with the reactors is described. Therefore in this article we simulated the TRV by EMTP at Bus Terminal Fault.

  • PDF

Analysis of a TRV influence according to application position of a SFCL (초전도 한류기 투입 위치에 따른 TRV 영향 분석)

  • Bang, Seung-Hyun;Rhee, Sang-Bong;Kim, Chul-Hwan;Kim, Jae-Chul;Hyun, Ok-Bae
    • Proceedings of the KIEE Conference
    • /
    • 2008.07a
    • /
    • pp.91-92
    • /
    • 2008
  • The rating of a circuit breaker depends not only on the interrupting current but also on a transient recovery voltage (TRV). To achieve a successful interruption, the circuit breaker must withstand the TRV. A superconducting fault current limiter (SFCL) is a device that limits the fault current fast and effectively without having high impedance during normal operation of the power system. Therefore, we studied the influence of the TRV according to the application of a resistive type SFCL in distribution system. This paper analyses the influence of the TRV for various application position of the resistive SFCL. The distribution system and the resistive SFCL were modeled by using EMTP-RV (Electromagnetic Transient Program - Restructured Version)

  • PDF

TRV analysis by using multi - port equivalent (다 단자망 축약 이론을 이용한 TRV 해석)

  • Yoon, Jae-Young;Moon, Young-Hyun;Park, Dong-Wook
    • Proceedings of the KIEE Conference
    • /
    • 1988.11a
    • /
    • pp.236-240
    • /
    • 1988
  • The simplified equivalent by using the short circuit impedance has been used for analyzing the prospective transient recovery voltage of the large power system. But it sometimes generates untorelable error in the rate-of-rise of TRV when using the Thevenin equivalent source. This paper provides the new equivalent by using the multi-port theory. The application of the new method to the sample system gives satisfactory accuracy compared with the short-circuit equivalent.

  • PDF

Evaluation Method II of the Small Current Breaking Performance of SF$_6$-Blown High-Voltage Gas Circuit Breakers (초고압 $SF_6$가스차단기의 소전류 차단성능 해석기술 II)

  • 송기동;이병윤;박경엽;박정후
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.50 no.8
    • /
    • pp.384-391
    • /
    • 2001
  • The insulation strength between contacts after current interruption to the transient recovery voltage i.e., the dielectric recovery strength should be estimated for the evaluation of the small capacitive current interruption capability. Many authors have used theoretical and semi-experimental approaches to evaluate the transient breakdown voltage after the current interruption. Moreover, an empirical equation, which is obtained from a series of tests, has been used to estimated the dielectric recovery strength. Un this paper, the theoretical method which is generated from the streamer theory has been applied to real circuit breakers in order to evaluated the interruption capability. The results of analysis have been compared with the test results and the reliability has been investigated.

  • PDF

Study on the Performance Verification Method and Failure Mechanism of Grading Capacitor of a Two-break Circuit-breaker (2점절 차단기 균압용 콘덴서 절연파괴 고장 메커니즘 및 성능검증 방법에 관한 연구)

  • Oh, SeungRyle;Han, Kisun;Kim, TaeKyun
    • KEPCO Journal on Electric Power and Energy
    • /
    • v.5 no.1
    • /
    • pp.11-15
    • /
    • 2019
  • Recently, the circuit-breaker rated voltage is getting higher as the transmission voltage increases. To increase the circuit-breaker rated voltage, a multi-break circuit-breaker which has two or more breakers in series is adopted. For multi-break circuit-breaker, a grading capacitor is used to mitigate the Transient Recovery Voltage(TRV) and control the voltage distribution across the individual interrupter units. However, all over the world, there are many failures such as mechanical damage, explosion due to insulation breakdown. Therefore, it is necessary to study the causes of failure and the new performance verification method. In this paper, we investigate the causes of dielectric breakdown of the grading capacitors in the KEPCO power system and propose the performance verification method.

Development of a 170kV 50kA Capacitorless Gas Circuit Breaker

  • Park, K. Y.;K. D. Song;Y. H. Oh;W. P. Song;J. H. Kang;Park, S. W.
    • KIEE International Transactions on Electrophysics and Applications
    • /
    • v.3C no.3
    • /
    • pp.73-76
    • /
    • 2003
  • In modern EHV (Extra High Voltage) class GCBs (Gas Circuit Breakers), the interruption capability for SLF (Short Line Fault) is one of the most important aspects of performance required for GCBs. Up to now, the SLF interruption capability of EHV class GCBs was partially assisted by the adoption of capacitors able to decrease the dV/dt of the TRV (Transient Recovery Voltage), particularly the TRV on the line side. This paper describes the technique to increase the SLF interruption capability of EHV class GCBs as well as the procedure to develop capacitorless l70kV 50kA GCB.