The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Induction machines for traction applications are operated at working points of high ferromagnetic saturation. Depending on the working point, a broad spectrum of harmonic frequencies appears in the magnetic flux density of induction machines. Detailed loss analysis therefore requires local and temporal highly resolved nonlinear field computation. This loss analysis could be performed in the post processing...
This paper presents a new method to calculate transient parameters of salient-pole synchronous machine by using finite element analysis(FEA). 2-D non-linear field-circuit coupled time-harmonic FEA analysis, static magnetic field FEA analysis and frozen permeability method are applied for transient equivalent circuit parameters calculation under no load three phases sudden short status. Transient parameters...
This paper deals with voltage transformer (VT) transient analysis in order to investigate the influence of voltage transformer behavior during the fault operation in medium voltage network. An accurate model of VT is described, when parasite capacities of secondary windings are taken into account in equivalent circuit and mathematical model of VT. The mathematical model of VT is described and derived...
This paper deals with detailed analysis of a current transformer (CT) under transient conditions. The equivalent circuit parameters of a real CT are determined by means of FEM and verified by measurement for measuring and protective part of CT. A developed mathematical model of CT with nonlinear B-H curve is then used in a circuit simulation to study different transient conditions under normal and...
Finite element method (FEM) is used for transient dynamic analysis of capacitive micromachined ultrasonic transducers (CMUT) and is particularly useful when the membranes are driven in the nonlinear regime. One major disadvantage of FEM is the excessive time required for simulation. Harmonic balance (HB) analysis, on the other hand, provides an accurate estimate of the steady-state response of nonlinear...
The authors have studied the effect of the quadrature axis transient reactance of large cylindrical synchronous machine on operation. Using the measured data, the authors studied the effect on the transient and stability phenomena by the finite element method (FEM) and the electromagnetic transients program (ATP-EMTP).
This paper describes a study on equivalent circuit model in a large synchronous machine. In this study, the authors studied the quadrature axis transient reactance xpsilaq, not only the influence of the operational impedance , but also the difference of transient and dynamic characteristics using finite element method (FEM) and EMTP.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.