Zobrazeno 1 - 10
of 320
pro vyhledávání: '"Akihiro Ametani"'
Publikováno v:
Energies, Vol 15, Iss 2, p 503 (2022)
This paper presents an accurate quasi-analytical approximation of frequency-dependent ac resistance of single rectangular conductors. In this work, first, a two-dimensional analytical ac resistance of rectangular conductors is derived. Unlike circula
Externí odkaz:
https://doaj.org/article/576f42a1fdfd41e88f226e45d21a5303
Publikováno v:
Journal of Energy : Energija
Volume 60
Issue 1-4
Volume 60
Issue 1-4
Switching surges are of primary importance in insulation co-ordination of EHV lines, as well as in designing insulation of apparatuses. The magnitude and shape of the switching overvoltages vary with the system parameters, network configuration and t
Publikováno v:
IEEE Transactions on Power Delivery. 36:3834-3845
A generalized formulation of earth-return impedance and admittance for overhead lines above a multi-layer earth is derived. An equivalent homogeneous earth method (EHEM) and a MoM-SO method with modified earth-return Green function considering an N-l
Publikováno v:
IEEE Transactions on Power Delivery. 36:3255-3265
The characteristics of external electromagnetic fields (EEMFs) produced by underground cables in the lossy earth are further investigated and studied. This paper develops an excitation current in the cables with the bi-directional propagation for the
Publikováno v:
IEEE Transactions on Electromagnetic Compatibility. 63:1258-1265
This article proposes modified formulas of Carson's and approximate earth-return impedances for overhead lines which can deal with high-frequency displacement currents. The calculated results by the proposed methodology are compared with those calcul
Publikováno v:
IEEE Transactions on Power Delivery. 36:1270-1280
A generalized formulation of electromagnetic fields generated from a multi-phase underground cable is proposed based on a complete solution of Maxwell equations. The lateral electromagnetic field components, the shielding effect of cables and the pha
Publikováno v:
IEEE Transactions on Electromagnetic Compatibility. 63:189-197
In this article, lightning-induced overvoltages due to inclined lightning are investigated by a finite-difference time-domain (FDTD) method for distribution lines of a single conductor and a multiphase line (three-phase conductors with a shield wire,
Publikováno v:
IEEE Transactions on Electromagnetic Compatibility. 62:2119-2127
This article investigates the transient characteristics of earth currents and grounding potential rises (GPRs) produced by lightning strikes directly to the earth and to a vertical conductor with a grounding electrode. Influences of the earth depth a
Publikováno v:
IEEE Transactions on Electromagnetic Compatibility. 62:144-154
This paper investigates lightning surges on a distribution line reported using a finite-difference time-domain (FDTD) method. FDTD simulation results show a satisfactory agreement with measured lightning currents when lightning strikes ground nearby