Application of controlled switching device for high voltage circuit breaker in KEPCO real power system

Cho, Chul‐Hee; Jeongbok, Lee; Min, Byoung-Woon

doi:10.1109/icepe-st.2017.8188892

Cited by 2 publications

(1 citation statement)

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“…Switch with pre-insertion active resistor can be used to extinguish large multiple voltages on the second harmonic. As shown by research [18][19][20][21], overvoltages on the second harmonic can exist for a long time, so the decisive factor in determining the scattering energy is the time of the emergence of an abnormal regime with unloaded autotransformer.…”

Section: Measures and Technical Means Of Improving The Reliability And Efficiency Of Ehv Power Transmission Lines Due To Switchingmentioning

confidence: 99%

Comparative Analysis of Measures and Technical Means for Suppressing the Aperiodic Current Component in Circuit Breaker

Kuchanskyi

2021

Izv. vysh. ucheb

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Electromagnetic transients are considered in the implementation of three-phase automatic reclose on the transmission line of extra high voltage 750 kV. The influence of automatic shunting of phases and pre-insertion active resistance for limiting the characteristics of the aperiodic component of the current, which obstructs the transition of full current through zero, is evaluated. The paper analyses measures taking into account the effect of changing the degree of compensation of charging power and the angles of switching on an SF6 circuit breaker. Sub-schemes of disconnected undamaged phases of the extra high voltage transmission line for the investigation of the aperiodic current component have been developed. The values of the pre-insertion active resistances of different connection and automatic shunting of the phases are determined at which there is an effective reduction of the characteristics of the aperiodic component of the current. In the software environment, a model was developed and switching transient processes were simulated in the 750 kV transmission line. Operating modes that are potentially dangerous for SF6 circuit breakers are determined and recommendations are given to avoid them. Currently the technical and economic requirements for power transmission lines designed for the transport of electricity from large power plants and for the communication of powerful energy systems are increasing. Today there is the importance of reducing specific investment in the construction of new and reconstruction of existing lines. The solution of these issues is associated with the maximum use of power lines by increasing their power transfer capability and controlling modes, especially in operating emergency conditions and post-emergency operation of power systems.

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Section: Measures and Technical Means Of Improving The Reliability And Efficiency Of Ehv Power Transmission Lines Due To Switchingmentioning

confidence: 99%

Comparative Analysis of Measures and Technical Means for Suppressing the Aperiodic Current Component in Circuit Breaker

Kuchanskyi

2021

Izv. vysh. ucheb

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Investigation of the impacts of the refill valve diameter on prestrike occurrence in gas circuit breakers

2021

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In puffer type Sulfur Hexafluoride (SF6) Circuit Breakers (CBs), the refill valve is the main inlet duct for the SF6 gas to enter the puffer volume. When the CB is closing and moving contacts and the nozzle are moving toward fixed contacts, the SF6 gas enters the puffer volume via the refill valve. Since changing the refill valve diameter can alter the direction of the SF6 gas motion in the closing operation of CBs, understanding its effects on CBs' function and performance may help to improve the CB design. This paper has focused on the effects of refill valve diameter on prestrike occurrence in the closing operation of puffer type SF6 CBs. In order to accurately study these effects, some equations are used in the developed multiphysics model, including the Navier–Stokes equations and standard K–ε turbulent model for modeling the motion of the SF6 gas, heat equation for calculation of the gas temperature, Maxwell equations for electromagnetic fields modeling, and gas state equation for taking into account the severe dependence of the SF6 gas properties on temperature. Numerical studies have been performed on a 72.5 kV CB. Performance and functionality of this CB have been investigated for four different refill valves from several physical aspects. Numerical studies show that the refill valve diameter has a considerable influence on the prestrike occurrence instant.

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Application of controlled switching device for high voltage circuit breaker in KEPCO real power system

Cited by 2 publications

References 0 publications

Comparative Analysis of Measures and Technical Means for Suppressing the Aperiodic Current Component in Circuit Breaker

Comparative Analysis of Measures and Technical Means for Suppressing the Aperiodic Current Component in Circuit Breaker

Investigation of the impacts of the refill valve diameter on prestrike occurrence in gas circuit breakers

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