Abstract
This study is focused on the assessment of the seismic risk for elements of the electric network (thermoelectric powerplants and substations) in Romania. Firstly, the main elements of the electric network analyzed in this study are briefly presented. Thermoelectric powerplants account for about 30% of the electricity production capacity and for about 40% of electricity production. The damage to the electric network in Romania caused by the Vrancea 1977 seismic event is presented in this study. The seismic fragility of thermoelectric powerplants as recommended by the SYNER-G project is evaluated in relation to the damage observed after the Vrancea intermediate-depth earthquake of March 1977. The impact of anchoring the components of substations and of powerplants on the seismic risk metrics is also evaluated using fragility parameters from the literature. The analyses show that the impact of anchoring the components on the seismic risk metrics is less important for substations than for thermoelectric powerplants. In addition, it was observed that the level of seismic risk is larger in the case of electric substations as compared to powerplants.
Highlights
The evaluation of the seismic risk for the European gas and electricity systems was performed by Poljanŝek et al [1] considering the seismic hazard results for rock conditions obtained in the GSHAP project [2]
A regional seismic risk assessment of electric substations was performed in the study by Zekavati et al [7]
This study is an extension of the previous two researches in the sense that: (i) the seismic risk was evaluated for ground motion levels computed through probabilistic seismic hazard assessment; (ii) an evaluation of the damage sustained by thermoelectric powerplants after the Vrancea 1977 earthquake was performed; (iii) the seismic risk assessment was evaluated using fragility functions from the literature, as well as models derived from the damage observed after the Vrancea 1977 seismic event; (iv) the seismic exposure was updated using other relevant information from the literature
Summary
The evaluation of the seismic risk for the European gas and electricity systems was performed by Poljanŝek et al [1] considering the seismic hazard results for rock conditions obtained in the GSHAP project [2]. A multihazard risk assessment framework of electric power systems subjected to earthquake and hurricane was proposed in the paper by Salman and Li [5]. Liu et al [6] developed in their study a seismic risk assessment framework for the electric power distribution system which considered both the network topology and the functional vulnerability of distribution substations. A preliminary study on the seismic risk of the electric network in Romania using an earthquake scenario-based approach was performed within the RO-RISK project [19]. In both studies, the fragility functions recommended by the SYNER-G project were employed [20]. This study is an extension of the previous two researches in the sense that: (i) the seismic risk was evaluated for ground motion levels computed through probabilistic seismic hazard assessment; (ii) an evaluation of the damage sustained by thermoelectric powerplants after the Vrancea 1977 earthquake was performed; (iii) the seismic risk assessment was evaluated using fragility functions from the literature, as well as models derived from the damage observed after the Vrancea 1977 seismic event; (iv) the seismic exposure was updated using other relevant information from the literature (in Romanian language)
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