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WG C4.501 Numerical Electromagnetic Analysis and Its Application to Surge Phenomena

 

Background :

The numerical electromagnetic analysis method (NEA hereafter) is becoming one of the most promising approaches to solve transient phenomena that are very hard to be solved by existing circuit-theory based simulation tools such as EMTP. Existing circuit-theory based approaches can not solve a transient involving a sphere-wave propagation, such as a transient across an archon and a wavefront transient at a transmission tower due to lightning. Also, the circuit-theory based approach has a difficulty to solve a transient in a complex media, such as a transient on a grounding electrode and that on a semi-conducting layer of a cable. Furthermore, the circuit-theory approach can not be applied if circuit parameters are not known. The NEA can solve such problems, because the NEA calculates Maxwell’s equation directly.

Scope :

One of the scopes of this WG activity will be the critical assessment of existing modeling methods of power system components and of simulation results by conventional circuit-theory based approaches. For example, the parameters of a grounding electrode adopted for its transient simulation and simulation results by the EMTP need to be critically assessed from the viewpoint of insulation coordination of a substation and the viewpoint of electromagnetic interference of a control circuit in the substation in comparison with measured results and simulation results by the NEA.

This WG will closely cooperate with WG C4.401 “Lightning” to exchange information of lightning parameters and to discuss simulation methods and results; TF C4.405 “Lightning Interception” to cooperate numerical simulations of the lightning interception if necessary; TF C4.406 “Performance of Grounding Electrodes for Lightning Currents” to exchange information of grounding electrode parameters and transient characteristics and to discuss the NEA of the grounding electrode transient if required.

Convener:

A. Ametani (Japan)

Publication:

TB543: GUIDE FOR NUMERICAL ELECTROMAGNETIC ANALYSIS METHODS: APPLICATION TO SURGE PHENOMENA AND COMPARISON WITH CIRCUIT THEORY-BASED APPROACH (Published: 2013-06)