This paper describes a new technology, the active earthing system, based on a multi-frequency power converter, which combines a new power electronic device with a protection and control system. This system allows network enhanced operation and maintenance, overcoming some of the limitations of the traditional earthing systems, giving rise to relevant improvement in supply continuity.

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This paper describes the transient overvoltages caused by the neutral grounding connection of the generators and transformers during phase to ground failures in some Mexican petrochemical plants. Examples of this type of overvoltages generated during phase to ground failures are shown, it can be seen that severe damages to the generators and other electrical equipments is produced. Unfortunately, these problems occur rather frequently and produce outages with great economical impact.A solution to this problem was proposed, by permanently connecting the neutral of all generators with a high resistance scheme using a grounding transformer. This solution has been presented to petrochemical plants and it has been accepted and finally introduced in one Mexican plant. Simulation and practice show that no overvoltages are presented by applying this solution.

Abstract.This paper describes and a new technology, the active earthing system, based on a multi-frequency power converter, which combines a new power electronic device with a protection and control system. This system allows network enhanced operation and maintenance, overcoming some of the limitations of the traditional earthing systems, giving rise to relevant improvement in supply continuity.The key questions and results of the validation along with lab testing data and field details are shown in this paper. The experiences of the first real application in a MV distribution substation being conducted in Gernika-Spain will be presented in ICREPQ'13 conference.

This paper presents the experience of applying project-based learning (PBL) on power electronics, in the context of two official Master degree courses. The discussion covers both strategic and implementation topics, from the initial conception of the Master and the subject, to practical implementation issues.The final conclusions show recommendations from experience for enhancing the learning experience in coming editions of the subject, and may also be useful for other academics.