- Rapport
- Kärnkraft
New Electrical Devices in Existing Nuclear Power Plants
Numeric protective relays are superior to older technologies regarding the increased functionality and flexibility. They have the potential to increase the performance of the protection but also if not implemented with care a risk of malfunction.
SF6 and vacuum are practically the two available technologies and have today replaced older types of breakers. The use of SF6 as a quenching medium is decreasing, much for environmental reasons. The risk of overvoltages with vacuum circuit breakers and the required protective measures might prohibit the use in safety classified applications at Nuclear Power Plants.
Surge arresters of metal oxide have made silicon carbide arresters obsolete. Metal oxide arresters have superior energy handling capacity and protective capability over previous technologies. Silicone housing which is used for metal-oxide surge arresters have almost ideal properties.
Rapporter och publikationer
Här listas rapporter och resultatblad från programmet.
- Rapport
Fast Frequency Support Impact On Nuclear Generation
This project assessed how Fast Frequency Support (FFS) from an HVDC link interacts with nuclear-type synchronous generator dynamics.
|2025:1145Danilo Obradovic', RISE
- Rapport
Impact of over-frequency events on Nordic NPPs
This report quantifies over-frequency events by using a simulation model of the Nordic synchronous system and simulating different faults related to the HVDC links, in combination with operating conditions of high and low inertia.
|2025:1118Matilda Arvidsson, Andreas Benjaminsson Lucas Finati Thomée, Daniel Karlsson
- Rapport
Exchange Strategies for Power Electronics in Rectifiers and UPS System for NPP
Replacing outdated power electronics in NPP auxiliary systems is crucial for maintaining operational reliability and safety.
|2025:1107Frede Blaabjerg
- Rapport
Trends of frequency deviations
In this report grid frequency statistics of the last two decades have been examined together with analysis of inertia values of the Nordic Power System. Interviews have been held with the Nordic Nuclear Production Plant owners and the Swedish and Finnish TSOs. Conclusions are made whether it exist correlations with system quantities like frequency quality, inertia, wind power production, wear and tear of nuclear plants, and system services.
|2025:1091Viktorija Dudjak, Jonas Persson, Markus Björklund