scholarly journals Modelling and Simulation of SF6 High-Voltage Circuit-Breakers - an Overview on Basics and Application of CFD Arc Simulation Tools

2017 ◽  
Vol 4 (3) ◽  
pp. 213-224
Author(s):  
F. Reichert ◽  
A. Petchanka ◽  
P. Freton ◽  
J. J. Gonzalez
Keyword(s):  
High Voltage ◽  
Development Process ◽  
Short Circuit ◽  
Circuit Switching ◽  
Simulation Tool ◽  
Circuit Breakers ◽  
Ansys Fluent ◽  
Case Examples ◽  
Simulation Tools ◽  
Complete Process

The paper gives an overview on the basics of CFD arc simulation tools with respect to the simulation of the fluid mechanical processes in the interrupter unit of SF<sub>6</sub> high-voltage circuit-breakers at no-load and short-circuit switching-off processes. On the example of SF<sub>6</sub> self-blast circuit-breakers the complete process from the analysis of the switching-off process to the creation of a modular simulation model consisting of several sub models is illustrated. Details to the modelling in the particular sub modules and to the implementation are given. The capability of a CFD arc simulation tool based on the program package ANSYS/FLUENT is demonstrated on the basis of selected simulation results. Furthermore case examples for the application of the presented CFD arc simulation tool in the development process of high-voltage circuit-breakers are given.

scholarly journals Evaluate shock capturing capability with the numerical methods in OpenFOAM

2013 ◽  
Vol 17 (4) ◽  
pp. 1255-1260 ◽  
Author(s):  
Azadboni Khodadadi ◽  
Mohammad Malekbala ◽  
Azadboni Khodadadi
Keyword(s):  
High Voltage ◽  
Internal Flow ◽  
Shock Capturing ◽  
Open Architecture ◽  
Quality Improvements ◽  
Circuit Breakers ◽  
Simulation Tools ◽  
Boundary Layer Interaction ◽  
Flow Phenomena ◽  
Basic Approaches

Simulations for both multiphase flows and supersonic single phased flows are well known, however the combination is a less investigated area of research, as the two basic approaches of CFD, the pressure and the density based approach, each describe one of the phases in a better way than the other one. In this paper, we systematically investigate the solver quality of the open source CFD code OpenFOAM in handling transonic flow phenomena that typically occur inside the breaking chamber of high voltage circuit breakers, during contact separation. The solver quality is then compared with that of chosen commercial CFD tools. The main advantage of OpenFOAM is that, contrary to most of the commercial simulation tools, it is license fee free and allows access to the source code. This means that complicated multi physics phenomena inside the arcing chamber can be directly modeled into the code by users, which opens an opportunity to remove limitations of commercial CFD tools. Particularly, the shock capturing capability of OpenFOAM will be evaluated for the transonic internal flow which typically occurs in high voltage circuit breakers. Overall, Open-FOAM shows acceptable shock capturing capabilities in the performed verification and validation studies, with the solver quality comparable to some of the tested commercial CFD tools. There is still room for further solver quality improvements in OpenFOAM by implementing better shock capturing schemes such as a density-based flux-difference-splitting scheme or by writing better physical modeling of the shock/boundary layer interaction into the open architecture of OpenFOAM.

scholarly journals Arcing Behaviors in the Large-capacity HV SF6 Gas-blast Interrupters

2019 ◽  
Vol 6 (2) ◽  
pp. 140-143 ◽  
Author(s):  
S. A. Averyanova ◽  
E. Tonkonogov
Keyword(s):  
High Voltage ◽  
Short Circuit ◽  
Dielectric Strength ◽  
Numerical Results ◽  
Circuit Breakers ◽  
Large Capacity ◽  
Recovery Processes ◽  
Strength Recovery ◽  
Turbulence Effects ◽  
Short Circuit Currents

A comprehension of the dielectric strength recovery processes during the interruption of short-circuit currents in the high-voltage SF<sub>6</sub> gas-blast circuit breakers is necessary for their modernisation in order to increase the rated voltage and short circuit breaking current per one break. This paper presents numerical results of the turbulence effects on the interruption ability in the SF<sub>6</sub> extinguishing arc chamber.

scholarly journals Gas flow–switching arc interaction in HV synchronous gas blast interrupters

2019 ◽  
Vol 140 ◽  
pp. 04016
Author(s):  
Natalia Kurakina ◽  
Vladimir Frolov ◽  
Eugeny Tonkonogov
Keyword(s):  
Gas Flow ◽  
Short Circuit ◽  
Distribution Networks ◽  
Nozzle Geometry ◽  
Circuit Switching ◽  
Circuit Breakers ◽  
Flow Energy ◽  
Thermal Requirements ◽  
Nozzle Shape ◽  
Current Zero

The paper is devoted to the solution of short-circuit switching problem in distribution networks by application of synchronous HV gas-blast circuit breakers (SCB). The reduction of the arcing energy by reducing the arcing time can extend the SCB expected service life by increasing its electrical life, minimizing the thermal requirements of the interrupting chamber. The paper studies the gas flow arrangement in the switching gap of the double-flow model SCB. Well-balanced and stable gas flow removes surplus energy from the switching arc. Three types of nozzle geometry are investigated. A numerical simulation with a grid reconstruction is used. A gas flow energy accumulation into the nozzle throats is observed at t=0.8-0.9 ms after the contacts opening. We evaluate the bottom time limit of the active interactions between the gas flow and the arc column before current zero under the synchronous commutation. A zone of stagnation depends on the nozzle shape and size and determines the level of the thermal-dielectric interruption ability.

scholarly journals Generate Various Parameters Of Trv Envelope Synthetic Test Circuit

2021 ◽  
Vol 12 (2) ◽  
pp. 1348-1356
Author(s):  
Jagadeesh Peddapudi, Et. al.
Keyword(s):  
High Voltage ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Circuit Breakers ◽  
Force System ◽  
Transient Recovery Voltage ◽  
Test Circuit ◽  
Synthetic Test ◽  
Recovery Voltage ◽  
The Impact

The most basic transient a circuit breaker needs to suffer during its activity is the transient recovery voltage (TRV), started by the electric force system as a characteristic response on flow interference. To test high voltage CBs, direct testing utilizing the force system or short out alternators are not practical. The testing of high voltage Circuit Breakers (CBs) of bigger limit requires huge limit of testing station. An equal infusion of short out current and transient voltage to medium and high voltage circuit breaker (CB) by a synthetic model is examined. Transient recovery voltage is made by a capacitor bank and is applied to CB. An optical set off spark gap has been utilized to interrupt short circuit and to introduce of transient recovery voltage that is applied across the contacts of circuit breaker. Transient recovery voltage examination can never be done totally, as the advancement of circuit breaker development and organization configuration goes on. The most widely recognized way to deal with TRV examination is concerning the supposed planned TRV, in which a suspicion of dismissing association between circuit breaker itself and the innate system recovery voltage is being made. Notwithstanding, it actually is by all accounts qualified to examine what circuit breaker means for transient recovery voltage. An ideal grouping to open/close of reinforcement test article and helper circuit breakers inside suitable chance to infuse of recovery voltage. The impact of reactance of inductive flaw current limiter just as distance to blame in short line issue condition on pace of ascent of recovery voltage. A 4-boundaries TRV synthetic test circuit dependent on equal current infusion technique is planned and mimicked for testing 145kV rating circuit-breakers according to new TRV prerequisites given in IEC 62271-100.

Research on fault clearing scheme for half-bridge modular multilevel converters high voltage DC based on overhead transmission lines

2020 ◽  
Vol 22 (1) ◽  
pp. 61-72
Author(s):  
Jingru Zhang ◽  
Baina He ◽  
Xingmin He ◽  
Yanchen Dong ◽  
Renzhuo Jiang
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Circuit Breakers ◽  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
Clearing Time ◽  
The Impact ◽  
Short Circuit Fault

Abstract When a short-circuit fault occurs on the transmission lines of high voltage DC transmission system based on modular multilevel converters, the fault cannot be cleared by adjusting the converter control system, which results in longer recovery time. Aiming at the problem above, a fault self-clearing scheme based on the fault clearing module for the half-bridge converter station is proposed. Combined with the actual operating status of the flexible DC transmission project, centralized parameter models are utilized to analyze the fault self-clearing mechanism. Besides, the impact of the discharge branch on the fault clearing effect is studied in depth to provide a design consideration for the fault clearing module and improve the comprehensive benefits of the proposed scheme. PSCAD/EMTDC simulation results show that the introduction of the fault clearing module in the half-bridge converter station can effectively suppress the fault short-circuit current and shorten the fault clearing time. In addition, circuit breakers on both sides of the line do not need to be tripped, providing a reliable guarantee for the subsequent adaptive restart process.

scholarly journals Analysis of Last Development Results for High Voltage Circuit-breakers Using New G3 Gas

2017 ◽  
Vol 4 (2) ◽  
pp. 157-160 ◽  
Author(s):  
P. Robin-Jouan ◽  
K. Bousoltane ◽  
Y. Kieffel ◽  
J. Y. Trepanier ◽  
R. Camarero ◽  
...  
Keyword(s):  
Global Warming ◽  
High Voltage ◽  
Global Warming Potential ◽  
Gas Mixture ◽  
Test Results ◽  
Chemical Behavior ◽  
Circuit Breakers ◽  
Simulation Tools ◽  
Environmental Friendly

Among many alternative gases proposed to replace SF6 as insulating gas, g<sup>3</sup> (green gas for grid), fluoronitril based component officially introduced at CIGRE 2014, can be now used for insulation projects and new environmental friendly circuit breakers. This gas mixture g<sup>3</sup>, presents a reduction of the global warming potential by 98% compared to SF<sub>6</sub> gas and shows quite good dielectric withstand capability. Many new investigations about thermal and chemical behavior have been done and are precised in this paper. Last switching test campaigns will be presented for 145 kV applications. Simulation tools should be updated to be applicable to these projects. Developments and comparisons with last test results will be analyzed.

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