Distribution transformers failures: How does it cost? Evidence from Greece

Doukas, Haris; Xidonas, Panos; Angelopoulos, Dimitris; Askounis, Dimitris

doi:10.1007/s12667-015-0186-0

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Power interruptions prevent farmers from carrying out many agricultural activities that rely on electricity. Particularly, P. Asaridis and D. Molinari: A conceptual model for the estimation of flood damage to power grids they disrupt the irrigation of agricultural land and have negative consequences for the rearing of livestock products (Doukas et al, 2016). For example, modern dairy farms suffer significant milk production losses (Huitu et al, 2020).…”

Section: Agriculturalmentioning

confidence: 99%

A conceptual model for the estimation of flood damage to power grids

Asaridis

Molinari

2023

Adv. Geosci.

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Abstract. Flood damage assessment is a critical aspect in any decision-making process on flood risk management. For this reason, reliable tools for flood damage estimation are required for all the categories of exposed elements. Despite infrastructures can suffer high economic losses in case of flood, compared to other exposed sectors, their flood damage modelling is still a challenging task. This is due, on the one hand, to the structural and dynamic complexity of infrastructure networks, and, on the other hand, to the lack of knowledge and data to investigate damage mechanisms and to calibrate and validate damage models. Grounding on the investigation of the state-of-the-art, this paper presents a conceptualization of flood damage to power grids and reviews the methodologies in the field for an in-depth understanding of the existing modelling approaches, challenges, and limitations. The conceptual model highlights: (i) the different kinds of damage (i.e., direct, indirect, and systemic) the network can suffer, (ii) the hazard, exposure, and vulnerability parameters on which they depend, (iii) the spatial and temporal scales required for their assessment, (iv) the interconnections among power grids and economic activities, and (v) the different recipients of economic losses. The development of the model stresses the importance of dividing the damage assessment into two steps: the estimation of damage in physical units and the consequent economic losses in monetary terms. The variety of damage mechanisms and cascading effects shaping the final damage figure arises, asking for an interdisciplinary and multi-scale evaluation approach. The ultimate objective of the conceptual model is to be an operative tool in support of more comprehensive and reliable flood damage assessments to power grids.

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Section: Agriculturalmentioning

confidence: 99%

A conceptual model for the estimation of flood damage to power grids

Asaridis

Molinari

2023

Adv. Geosci.

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“…An additional difficulty in implementing appropriate insulation inside transformers (especially of distribution type) is the limited amount of space resulting from the requirements regarding their dimensions, which have to enable the installation of the unit in accordance with their intended use in the power grid. A similar problem concerns transformers installed in windmills, where space for transformers is also very limited [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Impact of Electrode Distance in a Quasi-Uniform Model Electrode System on Lightning Impulse Breakdown Voltage in Various Insulating Liquids

Kunikowski,

Rozga,

Pasternak

et al. 2024

Energies

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This study presents findings on the influence of gap length distance on the lightning impulse breakdown voltage of three dielectric liquids of different chemical origins. The liquids were tested in a model electrode system with a quasi-uniform electric field distribution and a pressboard plate placed on the grounded electrode. The experimental studies were supported using calculations and simulations to show the individual relationships between the lightning impulse breakdown voltage and gap distance, which represent the so-called volume effect of the most stressed liquid. The results of the experiment, which involved four considered gap distances of 2, 4, 6, and 8 mm, show that a dynamic increase in lightning impulse breakdown voltage with an increase in gap distance is associated with mineral oil and bio-based hydrocarbons. However, similar trends were not observed for synthetic ester. Calculations that allowed us to assess the impact of gap length distance on lightning impulse breakdown voltage support the observations from the experimental studies. The curves obtained in this field can be considered in the process of designing insulating systems for transformers.

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“…Each unexpected outage of power transformer is associated with financial losses for its owner, as well as the energy consumers who are supplied through this transformer. Additionally, when unsealing the transformer tank, a fire might break out or a leakage of mineral oil (still the dominant insulation and cooling medium in power transformers) might occur, causing soil and water contamination [1,2]. Hence, it is important to detect at an early stage, all signals that might indicate a potential defect in a transformer.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Results of Diagnostic Measurements with an Internal Inspection of Oil-Filled Power Transformers

Piotrowski

Rózga

Kozak³

2019

Energies

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This article presents a description of four independent case studies concerning situations when power transformers were directed to internal inspection. This inspection was the result of a specific case of a routine diagnostic procedure that was carried out and, where the transformer was switched off by a Buchholz gas relay. The case studies described were selected such that they represented situations when availability of historical data on the previous measurements was limited and a quick diagnosis had to be made on the basis of the results from the last measurement. In all of the cases presented here, the analysis of the gases dissolved in oil had played an important role in the detection of the defects that turned out to be dangerous for further exploitation of the transformers considered. The first signal about a possible developing defect was elicited solely from the measurements of the oil samples taken from the transformer in service. However, more detailed recognition and initial localization of the defect was possible after additional supplementary measurements (winding resistance, sweep frequency response analysis, etc.), which required the transformer to be switched off. The conducted sequence of actions, based on the developed diagnostic procedure, indicated the possibility of effective and early withdrawal of the transformer from operation, before it underwent a serious failure.

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Distribution transformers failures: How does it cost? Evidence from Greece

Cited by 5 publications

References 9 publications

A conceptual model for the estimation of flood damage to power grids

A conceptual model for the estimation of flood damage to power grids

Impact of Electrode Distance in a Quasi-Uniform Model Electrode System on Lightning Impulse Breakdown Voltage in Various Insulating Liquids

Comparative Analysis of the Results of Diagnostic Measurements with an Internal Inspection of Oil-Filled Power Transformers

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