Arc models for simulating processes in circuits with a SF6 circuit breaker (original) (raw)

A method of obtaining of electric arc model parameters for SF6 power circuit breakers

IEEE EUROCON 2009, 2009

In this work, a new method for calculating the parameters of electric arc model for SF 6 power circuit breaker is proposed. The methodology consists in the optimization of a theoretical function with respect to a group of model parameters in order to achieve a better approximation to a set of experimental data. The theoretical function is an asymptotic solution of the equation for the electric arc model obtained in a selected period of time. The developed method is applied to calculate the parameters of an arc model previously published in the literature. By using the variation of the cooling power, an improved electric arc model is also obtained including its parameters. The new model has a very compact form and exhibit a good correlation between voltage curves measured and calculated.

Numerical Arc Model Parameter Extraction for SF6 Circuit Breaker Simulations

In recent years some work has been conducted in the area of circuit breakers modeling in order to improve the capability of high voltage circuit breakers through simulations. Most of the research has been concentrated in describing the circuit breaker behavior by mathematical modeling, as well as numerical modeling of the pre or post current zero periods. The fundamental problem when trying to implement the existing models is to obtain reliable values of the unknown parameters of the mathematical model. Through this work a modified Cassie-Mayr model has been implemented in both EMTP (Electro-Magnetics Transients Program) and MATLAB. The EMTP simulation produces current and voltage oscillograms that are then supplied to the optimization routine in MATLAB for evaluation and validation of the parameter extraction procedure. T he modified Cassie-Mayr model has proved to be a reliable tool for the study of arc interruption of high-pressure gas circuit breakers because it takes into account pre and post current-zero conditions. The Cassie-Mayr model has four constant parameters, which changes according to the device (interrupter) and external circuit conditions. This work aims to develop a better parameter extraction routine, which is based on the MATLAB optimization function of nonlinear least squares. In this work we present the results of the parameter extraction routine developed to determine the four parameters from voltage and current oscillograms of tested and/or simulated devices.

A METHOD OF OBTAINING OF ELECTRIC ARC MODEL PARAMETERS FOR SF6 POWER CIRCUIT BREAKERS

A new method of calculating parameters of electric arc model of SF 6 power circuit breaker is proposed. The methodology consists in the optimization of a theoretical function with respect to a group of parameters of model in order to achieve a better approximation to a set of experimental data. The theoretical function is an asymptotic solution for the voltage that is obtained for a selected period of time. The developed method is applied to obtain the parameters of an arc model previously published in the literature. By means of a variation of the cooling power P 0 +P 1 iu, a new electric arc model is obtained including the additional parameters of model. The new model has a very compact form and results in a better correlation between the theoretical voltage curves and the experimental oscillograms.

A method of obtaining of electric arc model parameters for SF6 power breakers

2009

A new method of calculating parameters of electric arc model of SF6 power circuit breaker is proposed. The methodology consists in the optimization of a theoretical function with respect to a group of parameters of model in order to achieve a better approximation to a set of experimental data. The theoretical function is an asymptotic solution for the voltage that is obtained for a selected period of time. The developed method is applied to obtain the parameters of an arc model previously published in the literature. By means of a variation of the cooling power P0 + P1iu, a new electric arc model is obtained including the additional parameters of model. The new model has a very compact form and results in a better correlation between the theoretical voltage curves and the experimental oscillograms.

Simulation of Arc Characteristics in Miniature Circuit Breaker

IEEE Transactions on Plasma Science, 2000

This paper focuses on the numerical investigation of arc plasma behavior in low-voltage circuit breaker with arcsplitting process included. A 3-D simulation model of a certain type miniature circuit breaker product is built and calculated, which is based on magnetohydrodynamics theory. Aside from coupled electromagnetic and gas dynamic interactions being considered as usual, a thin layer of nonlinear electrical resistance elements is used to represent the voltage drop of plasma sheath and the formation of new arc roots. Thus, the arc-splitting process with ferromagnetic plates can be included. Arc motion is described in detail by the temperature distribution. Some interesting phenomena are observed in the simulation, such as the arc root jumping from contact to arc runner, the arc back commutation before splitting into series arcs by metallic plates, new arc root formation in splitting process, and, finally, the arc go across the splitter plates in the chamber. Moreover, the simulation result is compared with experimental result, which shows good agreement.

BLACK BOX ARC MODELING OF HIGH VOLTAGE CIRCUIT BREAKER USING MATLAB/SIMULINK

iaeme

Over the years, as our knowledge of the interrupting process progressed, many techniques have been developed to test the circuit breakers and simulated arc model There are three models (Physical Model Black Box Model and Parameter Model) that describe the behavior of f arc. This paper evaluates the black-box arc model for circuitbreakers with the purpose of finding criteria for the breaking ability. A black-box model is a model that requires no knowledge from the user of the underlying physical processes. In this paper, knowledge of the physical processes is required when evaluating and developing the arc models. This paper is meant to give a detailed study of black box model with the purpose to evaluate, combine, improve and apply to already existing circuit-breakers. Cassie-Mayr arc models was evaluated. Cassie’s model gives good results for large currents, while Mayr’s model is better for currents near zero. Therefore, a combination of the Cassie and Mayr model will be used to obtain better result

A Practical SF>sub<6>/sub< Circuit Breaker Arc Model for Studying Shunt Reactor Switching Transients

2005/2006 PES TD, 2006

The transient voltages generated by a SF 6 circuit breaker during switching off the shunt reactor may cause power quality problems in the transmission system. This paper proposes a practical SF 6 arc model for studying the shunt reactor switching transient phenomena. The proposed model includes a time-controlled switch, Mayr's arc model with parameters estimate, and TACS for CB energy conservation and dynamic conductance control. Three cases are performed to test the usefulness of the proposed model. Results obtained are compared with the calculated data. It shows that the proposed CB model is relatively accurate to characterize the shunt reactor switching transients.

Low-voltage circuit breaker arcs—simulation and measurements

Journal of Physics D: Applied Physics, 2013

As one of the most important electrical components, the low-voltage circuit breaker (LVCB) has been widely used for protection in all types of low-voltage distribution systems. In particular, the low-voltage dc circuit breaker has been arousing great research interest in recent years. In this type of circuit breaker, an air arc is formed in the interrupting process which is a 3D transient arc in a complex chamber geometry with splitter plates. Controlling the arc evolution and the extinction are the most significant problems. This paper reviews published research works referring to LVCB arcs. Based on the working principle, the arcing process is divided into arc commutation, arc motion and arc splitting; we focus our attention on the modelling and measurement of these phases. In addition, previous approaches in papers of the critical physical phenomenon treatment are discussed, such as radiation, metal erosion, wall ablation and turbulence in the air arc. Recommendations for air arc modelling and measurement are presented for further investigation.

Mechanical DC circuit breaker model for real time simulations

International Journal of Electrical Power & Energy Systems, 2019

The main goal of the paper is the modeling of the mechanical circuit breaker (MCB) that can replicate the breaker characteristics in real time environment. The proposed MCB with active current injection is modelled for a system level, which provides adequate representation of the circuit breakers for system analysis studies. External current-voltage characteristics of the proposed MCB models replicate the ones of the devices in the real world. It is well known that the DC circuit breaker (DCCB) needs to interrupt DC faults very quickly in order to avoid converter damages. The total current interruption time consists of fault detection time, time needed for the DC protection to provide command to the DCCB, and DCCB arc clearing time. Thus, it is necessary to demonstrate the system performance of associated protective devices through real time simulation, before these devices can be implemented and commissioned in practice. This paper presents a detailed modeling of the mechanical DCCB in real time simulation environment based on RTDS. The performance of the model is verified by the simulations based on PSCAD and meaningful conclusions are drawn.