Three-Dimensional FDTD-Based Simulation of Lightning-Induced Surges in Secondary Circuits With Shielded Control Cables Over Grounding Grids in Substations

three dimensional simulation and testing of radiative electromagnetic wave characteristics on electronic circuits using fdtd method

voltages and currents are induced into electronic circuit boards as electromagnetic waves are radiated on them. the strength of induction depends on the wavefront and the circuit board characteristics. in this paper, by solving maxwell’s equations using fdtd method and then by extending it by three dimensional simulation using the gpml criteria for boundary conditions and tf/sf technique, effec...

Lightning Protection of Ehv Substations in Iran

Extra high voltage (EHV) substations are extremely vulnerable to the hazard of lightning strokes therefore, the shielding of these substations with a highly reliable protective scheme (shield wires) is an essential undertaking. In this paper an attempt is made to clarify the design procedure for shielding EHV substations against lightning with special reference to Iran.

Software Methods for Analysis of Transient Voltages Coupled to Shielded Cables in Hv Substations

Two main causes of such induced voltages in the shield are: time-varying magnetic flux and potential difference at the cable connections with the earthing system. It has been shown in that both components of the voltage along shield, due to ground potential difference and field coupling, are significant and moreover that they cancel each other. As a consequence, it is possible to optimize the d...

Theory of Shielding and Grounding of Control Cables to Reduce Surges

Lemp Effects on Control Cables in High-voltage Substations

This paper presents the numerical simulations of a direct lightning stroke into an open air HV (high-voltage) substation. Lightning current flowing through the conductive earthed structures over the ground and in grounding grids induced transients in low-voltage control cables. In calculation the different striking points, soil parameters and arrangements of cables have been taken into account.