The current power cables IEC standards do not provide adequate recommendations for after-laying testing and diagnosis of offshore export and inter-array power cables. However the standards IEEE 400 and IEEE 400.4 recommend partial discharge monitored testing, e.g., by continuous or damped AC voltages (DAC). Based on the international experiences, as collected in more than 20 years at different power grids, this contribution focuses on the use of DAC for after-laying testing and diagnosis of submarine power cables both the export and inter-array cables. Higher risk of failure, long unavailability, higher repair costs, and maintenance costs imply that advanced quality control is becoming more important. The current state of the existing and drafting international standards are based on onshore experiences and not related to the actual serious problems experienced with failures on export up to 230 kV and inter-array cables up to 66 kV. The application of damped AC as a testing solution in this concern is specially discussed. The advantages of this testing technique, in combination with actual testing examples, show the findings on export and inter-array cables at offshore wind farms.

A medium voltage (MV) cable network is a substantial component of the distribution network. Present management of this grid segment is mainly based on the failure rate analysis, i.e., a rise in the number and kind of faults on the actual line means that its technical condition is getting worse. The efficiency of the power system is low and additional costs of repair works, supply interruption, difficulties in the investment planning and operation and maintenance works are necessary. The aim of the R&D works done in the realised project is to implement the management of the MV cable network based on the estimated condition of the individual cable line, obtained from diagnostic measurements. The diagnostic investigations of the cable lines are the reference. Many years of research work have led to the development of the Health Index based on diagnostic, technical and service data.

W artykule przedstawiono konsekwencje prognozowanej w perspektywie roku 2040 transformacji energetycznej dla planów odbudowy Krajowego Systemu Elektroenergetycznego po awarii katastrofalnej na podstawie dwóch scenariuszy, tj. uwzględniając dotychczasowe strategie oraz przyjmując alternatywny scenariusz zaangażowania wybranych źródeł OZE do procesu odbudowy.

W artykule opisano zastosowanie szcześciofluorku siarki jako medium izolacyjnego w urządzeniach elektroenergetycznych wysokiego napięcia. Przedstawiono także inne gazy i ich mieszaniny jako alternatywne do SF6.