The use of high-power electromagnetic sources to disrupt or maliciously damage electronic devices in critical power infrastructures is growing in concern. This paper presents a vulnerability study where a digital protection relay is exposed to high-power electromagnetic interference signals. The results reveal failures of this device that can impact the operation of power substations.

The response of antennas with nonlinear loads is investigated. In this contribution we present a method capable to perform simulations on antennas with multiple nonlinear loads that are less time and memory consuming than traditional proceedings. Moreover, these methods also contribute to a better understanding of observed effects. This is shown using an antenna with two nonlinear loads. A deep insight on how nonlinear loads affect the reception behavior of an antenna will be provided.

Using the method of modal parameters, developed earlier, equations for the Singularity Expansion Method (SEM) poles were obtained. Numerical investigation of solutions for the poles of the fist layer have shown good agreement with analytical and numerical results obtained earlier.

For energy efficient power conversion, fast switching power semiconductors are used within power electronics. The switching can lead to disturbances of other electrical devices because of interference on the power line and in the air. The common aluminium heat sinks for the cooling of the power semiconductors are electrically conductive and lead to more interference. Using an electrically isolating ceramic heat sink is an approach to reduce the interference from the heat sink.