Study on Numerical Method of Transient Electromagnetic Field Coupling to Secondary Cable in Substations
Yi Bin · Proceedings of the CSEE · 2008
An improved thin-wire model for the finite-difference time-domain(FDTD)method is proposed in order to evaluate induced effects of transient electromagnetic fields on multi-conductor transmission lines.Discrete equations of the electromagnetic field components near the ends and the corners of finite length straight thin-wire were achieved on the base of electromagnetic scattering theory.For the case of different resistance,transient voltage and current waveforms on the resistors at both ends of double-conductor transmission lines excited by electromagnetic pulse(EMP)were computed.The computed waveforms are exactly validated by the experiment.The results indicate that the improved model of three-dimension FDTD method is effective for analyzing transient induced effects in thin-wire excited by external electromagnetic fields.It can be used for investigating transient electromagnetic fields coupling to secondary cable in substation.