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Circuit breakers are important components in the electrical power supply grid. The maintenance of high voltage gas circuit breakers requires high personnel as well as monetary efforts for the asset operator. Furthermore, a faulty reassembly of the circuit breaker during maintenance can lead to a circuit breaker failure during operation. For this reason the maintenance strategy changed from a periodic...
A key challenge for future switching technologies, especially in the context of the substitution of the strong greenhouse gas sulphur hexafluoride and the ongoing development of DC grids, is the increase of the contact opening velocity within switching devices. Thus, in this contribution a compact helical coil operating mechanism is developed and first experimental investigations are performed to...
The maintenance of high voltage gas circuit breakers requires high personal as well as monetary efforts for the asset operator. Furthermore, a faulty reassembly of a circuit breaker during maintenance can lead to a circuit breaker failure during operation. One possibility to reduce those efforts as well as the failure risk is the application of non-invasive diagnostic techniques. This research work...
The search for alternatives for the strong greenhouse gas SF6 (sulphur hexafluoride) in high voltage gas insulated switchgear (GIS) and circuit breakers lead to the identification of CO2 (carbon dioxide) as possible substitute for use as quenching gas. Nevertheless the first prototypes of circuit breakers filled with CO2 up to rated voltages of Ur = 145 kV show that an optimization of the CO2 technology...
The ongoing debate on climate change and emission restrictions for greenhouse gases also forces the search for SF6 alternatives (sulphur hexafluoride) in the energy transmission and distribution sector. Hence several challenges for the asset manufactures result as changing the insulating medium implies a redesign of the switchgear and its components. Here one effect in gas insulated switchgear is...
In standard high voltage gas circuit breakers -important safety elements in today's power grids-, a small surface layer of polytetrafluoroethylene (PTFE) vaporizes at the high temperatures occurring in the arcing zone during the high current phase of the interruption process. This ablation continues even some hundred microseconds after the arc has been quenched and it actually changes the total gas...
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