Assessing degradation of power transformer solid insulation considering thermal stress and moisture variation

Medina, Roxana Beatriz; Romero, A. A.; Mombello, Enrique E.; Rattá, G.

doi:10.1016/j.epsr.2017.04.006

Cited by 31 publications

(31 citation statements)

References 25 publications

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“…Sin embargo, el deterioro del aislamiento sólido no sucede de manera uniforme en los devanados de los transformadores de potencia, sino que se concentra en zonas puntuales, específicamente en el denominado "Punto Caliente" (Hot Spot -HS del inglés) (Medina et al, 2015). En tal punto es el lugar donde se produce el mayor envejecimiento del aislamiento sólido por degradación térmica (Medina et al, 2017). La TPMC es de gran utilidad para estimar el envejecimiento del aislamiento solido debido al efecto térmico, dada la criticidad que tiene sobre el mismo.…”

Section: Temperatura De Punto Calienteunclassified

“…Este modelo estima la TPMC a partir de la carga atendida, la temperatura ambiente, datos de placa y algunos parámetros de la prueba de calentamiento. Esto se logra mediante la solución de las ecuaciones diferenciales (1) y (2) (Susa y Lehtonen, 2006a;Susa y Lehtonen, 2006b;Medina et al, 2017). La primera representa la temperatura del aceite en la parte superior del transformador θTO y la segunda, la temperatura del punto más caliente θHS.…”

Section: Modelo Termoeléctrico De Dejan Susaunclassified

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Estimación de la temperatura de punto caliente en transformadores de potencia inmersos en aceite mineral utilizando regresión con vectores de soporte

et al. 2020

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Section: Temperatura De Punto Calienteunclassified

Section: Modelo Termoeléctrico De Dejan Susaunclassified

Estimación de la temperatura de punto caliente en transformadores de potencia inmersos en aceite mineral utilizando regresión con vectores de soporte

et al. 2020

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“…Solid dielectric materials are vital for the adequate functioning of electrical equipment. They are used as insulating materials in applications ranging from electrical and electronic wires to power generators and high‐voltage power transformers [1, 2]. Partial discharges (PDs) in cavities play a significant role in the ageing mechanisms of solid dielectrics due to ion bombardment, molecules excitation, and changes in the temperature and pressure inside the cavity, which produce local erosion and deteriorations that lead to a final dielectric breakdown [3–6].…”

Section: Introductionmentioning

confidence: 99%

Finite‐element‐analysis models for numerical simulation of partial discharges in spherical cavities within solid dielectrics: a review and a novel method

Rodríguez‐Serna

Albarracín‐Sánchez

Mas’ud³

2020

High Voltage

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During the last two decades, partial discharges (PDs) modelling methods have been used as a complement of insulation diagnosis systems of electrical assets. Finite‐element‐analysis models for simulating PDs in cavities within solid dielectric materials are reviewed and a novel model is presented, which combines the main advantages of electrostatic and electric current models. The theoretical background is presented and some limitations and restrictions are discussed. A case of study was implemented for three different ageing conditions and simulation results exhibit good agreement with reported values by other authors in the literature. An analysis of variations of PD behaviour with ageing as a function of temperature and pressure is briefly presented. It is concluded that more research is needed to include physical and chemical interactions on the void surface and that the cavity surface conductivity plays a fundamental role in the PD simulations at advanced ageing conditions.

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“…However, when the integration reaches a higher level, its impact on the distribution devices cannot been ignored. For example, the changes in the shape of the load curve could hasten the degradation of distribution transformers [4] and bring prior costs to the distribution devices [5]. Different objectives of a green, reliable, and economical distribution system could be contradicted under a short-term frame; however, when under a longer time frame, they could be complementary to each other.…”

Section: Introductionmentioning

confidence: 99%

Multi-Dimensional Indexes for the Sustainability Evaluation of an Active Distribution Network

Sun

Ren

et al. 2019

Energies

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An active distribution network (ADN) differs from a traditional distribution network in many aspects, one of which is the integration of a large amount of distributed generation (DG), especially intermittent photovoltaics (PVs). The integration of intermittent PVs has both pros and cons for the distribution system. As the platform on which new techniques work and the main body of a greener future energy system, the development of an ADN has to be sustainable, need-oriented, and environmentally friendly, and the traditional technical–economic evaluation method cannot meet the requirements and provide advice in the decision-making process. Based on the concept of sustainable development, we used an ADN with the integration of a large number of distributed PVs (DGPVs) as an example and established a multi-dimensional index system to evaluate the sustainable development level (SDI) of the ADN. The analysis was based on a platform we built with consideration of the investment feasibility of the DGPVs’ investors, state and industrial policies, and their interactions with the distribution system. We first compared the development of DGPVs and the SDI of the ADN as the carrier of DGPVs under different state policies, and second, we compared the SDIs of three city ADNs with different solar resources and demand levels, but under the same state policy. The analysis results showed that different integration levels of DGPVs can be set for a city/area ADN with different solar resources and demand to achieve a comparable SDI, and a comprehensive incentive mechanism could be adopted for the development of DGPVs. In this way, the benefits of different parties can be considered at the same time and finally, the coordination of the sustainable development of multi-parties can be achieved.

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Assessing degradation of power transformer solid insulation considering thermal stress and moisture variation

Cited by 31 publications

References 25 publications

Estimación de la temperatura de punto caliente en transformadores de potencia inmersos en aceite mineral utilizando regresión con vectores de soporte

Estimación de la temperatura de punto caliente en transformadores de potencia inmersos en aceite mineral utilizando regresión con vectores de soporte

Finite‐element‐analysis models for numerical simulation of partial discharges in spherical cavities within solid dielectrics: a review and a novel method

Multi-Dimensional Indexes for the Sustainability Evaluation of an Active Distribution Network

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