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3 results on '"Manolis, Theagenis"'

1. Quantifying Photovoltaic DC Interference on Buried Pipelines: Exploring Theory, Conducting Experiments, and Field Testing

Author

Charalambous, Charalambos A., Dimitriou, Andreas, Melios, Christos, Kioupis, Nikolaos, and Manolis, Theagenis

Abstract

This paper conducts a comprehensive analysis of the challenges linked to photovoltaic (PV) DC interference affecting buried pipelines. Although the ISO 21857:2021 standard acknowledges these challenges, a continued lack of awareness persists, primarily due to the industry's longstanding emphasis on PV energy-centric issues, rather than a consideration of their potential impacts on nearby third-party infrastructure. The study delves into the intricacies of quantifying PV DC interference on buried pipelines, encompassing aspects such as low magnitude, intermittence, and the static nature of this phenomenon. Drawing insights from field-testing a 5.5 MW Photovoltaic Park intersecting a pipeline, alongside theoretical frameworks, controlled experiments, and modeling, the research underscores the necessity of developing new strategies for monitoring PV interference on pipelines. Furthermore, the paper discusses the challenges involved in a priori establishing a safety distance between PV parks and buried pipelines. In its entirety, the paper contributes to comprehending and addressing the intricacies of PV DC interference near buried pipelines.

Published
2024
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2. Wall Fusion of Buried Pipelines Due to Direct Lightning Strikes: Field, Laboratory, and Simulation Investigation of the Damaging Mechanism

Author

Charalambous, Charalambos A., Dimitriou, Andreas, Kioupis, Nikolaos, Manolis, Theagenis, Kokkinos, Nicholaos D., Charalambous, Charalambos A. [0000-0003-4476-9332], and Kioupis, Nicolaos [0000-0002-5455-3773]

Subjects
Ground, 020209 energy, Flow (psychology), Energy Engineering and Power Technology, 02 engineering and technology, Lightning, Mechanism (engineering), Pipeline transport, Lightning strike, Mining engineering, 0202 electrical engineering, electronic engineering, information engineering, Fuse (electrical), Environmental science, Electrical and Electronic Engineering, Current (fluid)
Abstract

Wall fusion of buried pipelines can occur if the driving voltage and available current is sufficiently high. For example, it can occur from direct lightning strikes to earth, close to the pipelines' routing. However, not all factors for defining the energy discharge needed to fuse the pipe wall are thoroughly investigated or understood. This paper enriches the ongoing research activities in an attempt to understand such detrimental damages. In particular, the paper formulates its research contents around a documented wall fusion incident on an underground gas transmission system, due to a nearby direct lightning strike. The investigation embraces field, laboratory, and modeling activities to provide insights on the damaging mechanism. Of particular importance in understanding this mechanism is the influence of soil ionization. To this end, a model is developed to investigate the soil-ionized flow of the lightning discharge current-into the pipeline's metal wall, through existing coating defects-thus revealing its detrimental effect. 35 2 763 773

Published
2020

3. Failures of insulating joints and spark gaps on the Hellenic Gas Pipeline System A case study

Author

Kioupis, Nick, Manolis, Theagenis, Papadimitriou, Panagiotis, Charalambous, Charalambos, Kioupis, Nick [0000-0002-5455-3773], and Charalambous, Charalambos A. [0000-0003-4476-9332]

Abstract

The practical experience derived from the field performance of IJs or flanges of the natural gas pipeline system of Greece is briefly presented. The defective insulation incidents on buried IJs were effectively mitigated by a proper surge protection scheme that has been applied. However, after a time period of a seemingly reliable operation, extending over a decade, two buried underground monolithic IJs lost their insulation properties despite being protected by properly installed ISGs. On another IJ the ISG malfunctioned whereas the IJ largely maintained its insulating properties. The causes of these failures are investigated and possible explanations are provided. The ageing and degradation of ISGs and the degradation of the dielectric strength of the joints is also discussed in the paper. 1 8

Published
2018

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