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Both experimental and numerical approaches have been done on switching arc plasmas for fundamental studies. In the experimental approaches, power-semiconductor switching has been used to control intentional current injections and voltage applications to switching arcs with a high accuracy in time. The systematic experiments provided the interruption probability property for different gas kinds and...
In this paper, dielectric recovery characteristic during operation of high voltage SF6 circuit breaker is studied by test method. The test circuit of dynamic breakdown characteristics is built. Circuit breaker closing and opening dynamic breakdown voltage curves under positive and negative polarity are obtained. Impact of inflatable pressure and closing speed to dielectric recovery characteristic...
In this paper, an interruption simulation model for 252kV Self-blast SF6 circuit breaker is built according to the MHD theory, using real gas model and dynamic mesh method. Aiming at acquiring the characteristics and the differences of interruption under different power frequency, the gas flow field at different power frequency 50Hz and 60Hz are simulated and compared. Seven analysis points at the...
Interruption of short circuit currents in high voltage circuit breakers requires high SF6 gas pressure, which can be generated by compression of SF6 gas and/or energy transfer from the arc. The pressure difference between circuit breaker chambers causes SF6 gas flow. The rise of pressure in the chambers is highly dependent on the design of the circuit breaker. This paper presents a universal approach...
High voltage SF6 circuit breaker must meet the breaking requirement for large short-circuit current, and ensure absence of breakdown after breaking small current. A 126kV high voltage SF6 circuit breaker was used as the research object in this paper. Based on the calculation results of non-equilibrium arc plasma material parameters, the distribution of pressure, temperature and density were calculated...
SF6 Gas-Insulated Metal-Enclosed Transmission Line (GIL) has the advantages of large transmitting capacity, low loss, small electromagnetic pollution for surroundings, strong capability to resist geological disasters, easy operation and maintenance, etc. In-depth research on the key technology of UHV GIL insulating part design, flexible line design, line manufacturing and detection, GIL installing...
In order to improve the breaking performance of the ultra-high voltage SF6 circuit breaker, an optimal design scheme for increasing the straight line length of the nozzle throat is proposed. Based on the numerical simulation of the gas flow field in the optimized structure of the interrupter, the influence of the straight line length of the nozzle throat on the breaking performance of the circuit...
High voltage circuit breakers are most important protective device in power system. Dynamic contact resistance measurement (DRM) is considered to be an effective assessment technique for contact ablation which has been widely used for many years. However, the contact resistance curves will be influenced by many factors, such as injected current and velocity. In power systems, circuit breakers often...
Numeric simulation and experiment comparison were used to determine the component parameter of GIS which have also provided a dynamic circuit model. The physical process of arc re-ignition is studied based on the theory of arc energy conservation in this paper. Mayr-Schwarz arc equation is applied to establish the model of arc resistance model. A new transient circuit model which simulated disconnector...
Taken the high voltage SF6 circuit breaker (HV SF6 CB) as the research object, a novel axial vortex chamber structure with an “X-type” guide blade constructed at the nozzle is proposed to exchange the energy of the turbulent gas flow in the radial direction during the interruption and to control the gas flow temperature gradient. The 3D flow field physical and mathematical model of the arc quenching...
Repetitive ignitions of SF6 gas discharge during switching operation in GIS may result in transient enclosure voltage (TEV) phenomena with the characteristics of high steepness, high amplitude and high frequency, which will disturb the electronic transformer seriously and decrease the reliability of electronic transformer dramatically. For this reason, the research about EMI mechanism of TEV which...
This paper presents the optimization scheme to improve the interruption performance of a gas circuit breaker, which must carry out the interruption duty within specific arcing time for successful operation. The systematic process of design optimization was proposed by using the Bezier curve and sequential approximation technique for satisfying both medium and maximum arcing time. Depending on the...
The very fast transient overvoltage (VFTO) generated by switching disconnector (DS) in gas insulated substation (GIS) with the features of high amplitude, short rise-time and complex frequency components, may cause damage to the insulation of electrical equipment. Therefore, in order to improve the safety performance of GIS equipment, it is very important to study the transient characteristics of...
Superior characteristics of SF6 gas have enabled its successful use as the interruption media in high voltage circuit breakers. Unique combination of physical properties considers high dielectric strength, high thermal interruption capability and high heat transfer performance. However, having in mind its high global warming potential (GWP), long term use of SF6 gas in the future should be called...
The paper looks briefly at the development of vacuum interrupters to date, discusses limitations to the existing technology of Vacuum Switchgear, what these are, and also how these may be overcome. It then moves on to discuss new developments in Vacuum Interrupter/ Vacuum Circuit Breaker technology which are likely to have an impact on the next generation of devices. Finally, it looks forward ten...
Vacuum circuit breakers are widely adopted in middle voltage class. Their application area has continued to spread to higher voltage class. Therefore the importance of electrical insulation technique in vacuum, especially the insulation of electrode gap has been required significantly. This paper describes the research on vacuum breakdown and discharges related to the electrode gap of vacuum interrupter.
The metallic vapor density in vacuum arc in a vacuum interrupter is crucial for deeper understanding of the anodic activities and dielectric recovery process. In this work, the objective is to measure the Cr metallic vapor density and its axial distribution along the gap in the vacuum arc between chromium contacts. The method of the optical absorption spectroscopy (OAS) using a broadband light source...
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