Simulation Model for Evaluation of IEMI Threat on Electrical Substation

Intentional Electromagnetic Interference (IEMI) with sufficiently high power is capable of disrupting the control instruments of the switchgear in a substation, which may lead to unexpected tripping of the switchgear of a critical power grid. To evaluate the IEMI threat of the control instruments in a substation, a numerical model based on an actual 22kV substation is developed. With the model, the transfer function between the excitation of a narrowband IEMI source and the resultant field strength is established so that the risk of an IEMI threat can be evaluated quantitatively.