Journal ArticleDOI
On the Mechanical Short-Time Rating of a Current Transformer
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TLDR
In this paper, the maximum force in the primary conductor of a wound current transformer (CT) is computed using closed-form expressions and finite-element methods, and it is shown that for a given volume for the primary winding, one configuration exists that leads to a maximum force.Abstract:
Closed-form expressions and a finite-element method are used to compute the maximum force in the primary conductor of a wound current transformer (CT). It is shown that for a given volume for the primary winding, one configuration exists that leads to a maximum force. It is proved that the mechanical short-time rating of two CTs having different turns but identical ampere turns is not equivalent. Designers can now establish and test a CT with a worst-case configuration.read more
Citations
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Journal ArticleDOI
Analytical estimation of short circuit axial and radial forces on power transformers windings
TL;DR: In this article, an analytical method is proposed to calculate exerted axial and radial forces on the high and low voltage (LV) windings in core type power transformers, which includes non-linear characteristics of the core materials, eddy currents effects, symmetrical and asymmetrical hysteresis loops of the used laminates.
Proceedings ArticleDOI
The effect of distribution of a primary winding on the short-circuit forces of a current transformer
G. B. Kumbhar,Satish M. Mahajan +1 more
TL;DR: In this paper, a 69 kV, 200/5A current transformer was modeled using field-circuit coupled finite element method (FEM) to compute the axial and radial forces on the primary conductors under a shortcircuit condition.
References
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Journal ArticleDOI
Parametric short-circuit force analysis of three-phase busbars-a fully automated finite element approach
TL;DR: In this paper, a three-phase busbar arrangement with straight rigid conductors carrying short-circuit currents is investigated and the electromagnetic forces are calculated by solving the electromagnetic field diffusion equation numerically, using finite elements.
Journal ArticleDOI
Mechanical short-circuit effects of single-core cables
W. Ruger,G. Hosemann +1 more
TL;DR: In this paper, a simple calculation model is presented that allows a determination of the permanent plastic deformation caused by short-circuit forces in plastic-insulated single-core cables, which is verified by tests in a heavy-current laboratory.
Journal ArticleDOI
Error estimation of current transformers using single or composite cores of ferromagnetic materials
TL;DR: In this article, a computer program which has been developed to estimate the errors of current transformers using single or composite cores of ferromagnetic material is discussed, which enables determination of the permeability and resolved excitation characteristics of a composite core formed utilizing N independent cores of M different materials.
Proceedings Article
Design margin for short circuit withstand capability in large power transformers
TL;DR: In this paper, the authors proposed a cycle-to-cycle approach for the short circuit test in a power transformer, which is a special test that establishes confidence in the designer and user in the integrity of the winding.
Journal ArticleDOI
Structural Analysis and Testing of HV Busbar Assemblies with Rigid Conductors under Short-Circuit Conditions
TL;DR: In this article, a general method is presented for calculating the dynamic stresses and displacements of busbar structures with rigid conductors under various short-circuit conditions, with or without reclosing on a fault.
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