Modellierung des typspezifischen Störungsaufkommens von Hochspannungs-Schaltgeräten
- Modelling the type specific failure occurrences of high voltage switching equipment
Federlein, Stefan; Schnettler, Armin (Thesis advisor)
Aachen : Mainz (2010)
Dissertation / PhD Thesis
In: Aachener Beiträge zur Hochspannungstechnik 15
Page(s)/Article-Nr.: VIII, 161 S. : graph. Darst.
Zugl.: Aachen, Techn. Hochsch., Diss., 2010
Increasing cost pressure due to regulatory guidelines, changing topology of electrical power generation as well as ageing of equipment and very volatile load flows are the main challenges for transmission and distribution system operators. Minimizing the total cost and providing a high security of supply at the same time is the aim of system operators. An efficient asset management will help to achieve theses aims. The optimal usage of equipment as well as determining their maximal lifetime are essential aspects in this optimisation process. One of the basic requirements is a comprehensive knowledge about equipments, their type specific behaviour as well as the impact of maintenance strategies on minor and major failure occurrences. Modelling the type specific failure occurrences of high voltage circuit breakers is the objective of this dissertation. First, based on a comprehensive database of minor and major failures as well as empiric findings, the failure model in case of current maintenance actions will be developed and applied on a representative population of circuit breakers. The new type specific ageing models show clear advantages over the general bath tub curve approach. The minor to major failure model (m2M) developed in this thesis, enables the mapping between maintenance actions and failure occurrences for the first time. Based on a probabilistic approach the model describes the progression from a minor to a major failure. Here it is presumed, that due to deferred maintenance, the minor failure which is normally discovered is not remedied and can subsequently progress to a major failure. The estimated failure occurrence after the normal maintenance interval is exceeded as a superposition of the previously calculated failure occurrence (current maintenance activities) with additional major failures which occur as a result of minor failures. This modelling approach allows a prognosis for type specific failure occurrences in case of modified maintenance actions. Comprehensive analysis on real maintenance data demonstrates the applicability of this approach for circuit breakers as well as for other equipments. Hence, type specific models to predict the failure occurrence of high voltage circuit breakers are available for the first time.