Electrodynamic Forces in a High Voltage Circuit Breakers with Tulip Contact System -FEM simulations (original) (raw)
Related papers
New possibility for the electroerosion estimation of the circuit breakers contacts
2008
Electroerosion estimation of the contacts realised in operation leads to an overestimation inducing a supplementary maintenance. In this paper is shown an architecture with microcontroller for the technical state evaluation of the switchgears contacts, from electroerosion point of view. This approach has the advantage that the architecture can be used, also, for the monitoring of the some cinematic parameters for the operating mechanism like as: closing speed, opening speed, closing time, opening time, the energy accumulated in the operating mechanism and others. Key-Words: contacts electroerosion, circuit breaker, architecture, microcontroller, embedded system.
Journal of Energy and Power Engineering, 2014
The DRM (dynamic contact resistance measurement) in high voltage circuit breakers is a manner of evaluating the internal ageing condition of the chamber. DRM is similar to static contact resistance measurement testing, but instead of measuring a single value when the breaker contacts are closed (static value), the ohmic resistance is measured at various contact positions, from the beginning of the contact opening until a complete separation of the contacts. The relationship between the contact resistances of the new circuit breaker and the ageing circuit breaker in operation provides subsidy for the evaluation of both the main and arcing contact conditions. This research aims to analyze the correlation between the various levels of degradation of the contacts and the configuration of the DRM curve. This work considers curve samples from new breaker chamber contacts and different levels of degradation by acceleration tests.
Comparison of Electromechanical Properties of Medium Voltage SF6 and Vacuum Circuit Breakers
2022 International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)
Vacuum circuit breakers are an important alternative in medium voltage gas-insulated switching equipment due to the environmental concerns of SF6. This study aims to examine and compare medium voltage SF6 and vacuum circuit breakers in terms of their electromechanical properties such as opening time, closing time, contact wipe, contact stroke and total distance. The motion curve and opening/closing times are tested by OMICRON CIBANO 500 with proper accessories. These tests are carried out on the 36kV rated voltage SF6 circuit breaker and vacuum circuit breaker manufactured by the Armtek Electric brand located in Ankara, Turkey.
Plasma Science and Technology, 2012
A three-dimensional (3-D) transient model has been developed to investigate plasma deformation driven by a magnetic field and its influence on arc stability in a circuit breaker. The 3-D distribution of electric current density is obtained from a current continuity equation along with the generalized Ohm's law; while the magnetic field induced by the current flowing through the arc column is calculated by the magnetic vector potential equation. When gas interacts with an arc column, fundamental factors, such as Ampere's law, Ohm's law, the turbulence model, transport equations of mass, momentum and energy of plasma flow, have to be coupled for analyzing the phenomenon. The coupled interactions between arc and plasma flow are described in the framework of time-dependent magnetohydrodynamic (MHD) equations in conjunction with a K-ε turbulence model. Simulations have been focused on sausage and kink instabilities in plasma (these phenomena are related to pinch effects and electromagnetic fields). The 3-D simulation reveals the relation between plasma deformation and instability phenomena, which affect arc stability during circuit breaker operation. Plasma deformation is the consequence of coupled interactions between the electromagnetic force and plasma flow described in simulations.
A Theoretical Study Determines the Electrical Contact Resistance Using FIT
This paper presents a numerical investigation which determines the electrical contact resistance for the circuit breaker. In this model, the stationary current simulation and a magnetostatic field calculation is also included. The numerical solution is based on a Finite Integration Technique (FIT). In this study, materials electric contacts are investigated. Simulation results calculate the model of resistance, visualize the current density fields and visualize the magnetic fields indicate. Such a FIT model can be used as a tool in the development and optimization of electrical contact.
Numerical simulations of high current arc in circuit breakers
2008
In a gas circuit breaker, a high temperature and pressure arc dissipates the tremendous amount of energy generated by the fault current, hence it protects the other parts of the circuit. Simultaneously this energy has to be transfered away from the contacts in order to protect the components of the circuit breaker. In this paper we present a model based on the three dimensional axis-symmetric equations of magnetohydrodynamics (MHD). This formulation allows us to study the behavior of the arc at very high currents. We generate numerical solutions in realistic, complex circuit breaker geometries, with real gas (SF 6) data using Runge-Kutta Discontinuous Galerkin (RKDG) methods. We study the various flow, thermal and electrical properties of the arc at high current.
3D finite element analysis of a miniature circuit breaker
2013 8TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE), 2013
In this paper a miniature circuit breaker (MCB) is analyzed using a finite method analysis (FEA) software. Once the 3D model was implemented, a series of simulations were carried out in order to find out the forces that appear inside the electromechanical trip unit and what influences the plunger to trip faster. Also, the influence of the material nonlinearity is emphasized in order to understand the real behavior of the material in a specific applied magnetic field.
The European Physical Journal Applied Physics, 2009
The presented study deals with the influence of the contacts materials on the evolution of the arc in low voltage circuit breakers. The commutation from the mobile contact onto the electrode is especially investigated in order to improve the breaking device performances. Hence, to preserve the qualities of the contact, the arc must leave this area as soon as possible. To undertake this study, several diagnostics are implemented. A measuring device is composed of magnetic induction sensors located outside the chamber. It allows the determination of the position and the volume of the arc during the breaking. Optical (ultraspeed camera) and electrical measurements are also performed with the technical support of Schneider Electric. Different current values (assumed peak current of 3 kA, 8 kA and 12 kA) and different natures of materials composing the electrical contacts have been tested. Copper contacts, different contacts on silver base obtained with different processes have been used. Experimental results show the influence of these various parameters on the arc volume and on the transfer of the arc towards the quenching chamber. Indeed, different dynamic behaviors are observed during the current transfer phase.
International Journal of Electrical Engineering Education, 2019
A proper and successful methodology of electrical contacts design is achieved by combining the theoretical and practical studies. This paper presents an instructional approach involving FEM simulations in order to aid in the practical operations on electrical contacts in MV and HV electrical apparatuses effectively. Prior to the completed engineering and scientific work in the field of the electrical apparatuses constructing the FEM based model is an effective way to achieve and understand the pros and cons of the experimental solutions. This design method is widely used by the industrial companies and can be implemented as an educational method giving young engineers a new edge. The desired effect of the proposed course was to develop student understanding of electrical contacts engineering by combining the theoretical (simulations) and the practical approach. Ordered creativity was successfully put into practice by checking the parameters derived from the simulations on the real scale layout which affected and enhanced student confidence in the field and in engineering skills. This instructional approach consisted of two sections (The Theoretical and the Practical) and is essential for understanding and further exploiting the acquired knowledge and certain other measures in engineering work. Moreover, it renders a complete engineering experience employing consequences and their impact on experimental electrical contact research based on multitasking and diversity. The statistical analysis proved that the proposed method had a significant impact and yielded improved results. Moreover, a major improvement in student learning and satisfaction after participating in the proposed course was noted.