Hydro Generator High Voltage Stator Windings: Part 1 – Essential Characteristics and Degradation Mechanisms

Znidarich, Michael M

doi:10.1080/1448837x.2008.11464196

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…As a general rule, the life of the insulation material is reduced by half for every 10°C rise in temperature. While Class B insulations meet the requirement of temperature rise, for modern winding designs Class F insulations are used wherever possible [11]. The objective is the lowering the winding temperature as much as possible to secure a long lifetime.…”

Section: Sariyar (1956)mentioning

confidence: 99%

“…Academics are also interested in the refurbishing because it could involve a challenging design problems. The majority of the publishing efforts made by Znidarich; these studies are based on core replacement [2], [3], and stator winding renovation [4]- [7]. In this article, a winding type alternation is proposed in addition to the current literature.…”

Section: Introductionmentioning

confidence: 99%

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Winding Type Alternation of a Refurbished Old Generator

Tosun¹,

Gülletutan²,

Yakut³

et al. 2023

Preprint

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<p>Refurbishment of hydro-generators promises an increased lifespan and improved efficiency. Old generators are not only less efficient but also less reliable; their fault occurrence is more common. The economic impact of out-service time can be astronomical. Thus, refurbishment is a critical task; but it is challenging too. Most of the conducted works focus on the material update, enhancing the cooling network, and obtaining better efficiencies. Modifying winding type, i.e. conversion from lap winding to wave winding is rare since it often requires a change in the slot number. Such a move can be laborious, size change can become mandatory. In this study, a refurbishment design strategy is proposed which includes a winding type conversion. The task is to implement a wave winding since it has less out-service time and is easily replaced by field workers. In this paper, an old generator that started operation in 1956 is used for a refurbishment. This study promises a guideline to hydro-generator designers who work on a refurbishment study on old hydro-generators that have diamond coils.</p>

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Section: Sariyar (1956)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Winding Type Alternation of a Refurbished Old Generator

Tosun¹,

Gülletutan²,

Yakut³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…It is a partial discharge. It is one of the important reasons for the final breakdown of the stator bar insulation damage [1][2][3]. Long-term corona discharge will cause electrical corrosion, insulation aging, thermal cracking, and other phenomena in the insulation layer, resulting in insulation failure, reducing the service life of the generator, and posing a pretty serious threat to the safe and stable operation of the motor [4].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of SiO₂ Content on the Properties of Epoxy Resin

Zhou,

He,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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With the development of energy layout in western China, the construction and operation of hydro-generator units in high-altitude and cold regions such as Tibet and Qinghai have increased rapidly, which puts forward stricter requirements for the insulation and anti-corona technology of high-altitude units. Improving the intrinsic properties of the matrix material is a highly efficient anti-corona method. In the paper, epoxy resin composites doped with different contents of micron silica were prepared. The effects of 0.5 wt%, 1 wt%, and 1.5 wt% SiO2 on the thermal conductivity, dielectric properties, and breakdown field strength of the matrix resin were researched. The results in this paper show that the doping of different contents of SiO2 has little effect on the thermal conductivity of the matrix resin, but improves the dielectric properties of the matrix resin to a certain extent. With the increase of SiO2 content, the breakdown field strength of the composites increased primarily and then decreased.

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“…La delaminación también puede ocasionar la separación generalizada entre las capas aislantes, incrementando considerablemente la cantidad de cavidades internas (Hudon y Bélec, 2005). Por lo tanto, un devanado con problemas de delaminación presenta incrementos considerables de DP y tangente de pérdidas (tan δ), en función de la tensión de prueba (Znidarich, 2008;Sathiyasekar, 2009). Fig.…”

Section: Introductionunclassified

Deterioro de Generadores de Alta Tensión Ocasionado por la Separación de la Pintura Conductora en las Bobinas del Estator

2016

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En este artículo, se presenta el deterioro de un generador que sufrió un sobrecalentamiento de 150 °C. El esfuerzo térmico ocasionó la separación de la pintura conductora de la superficie del aislamiento, en algunas zonas del devanado, debido a que la pintura conductora no cumplió con los requerimientos de la Clase F. Esto generó cavidades internas debajo de la pintura conductora, las cuales ocasionaron pulsos esporádicos de descargas parciales de gran magnitud a bajos niveles de la tensión de prueba. Este mecanismo fue monitoreado a través del tiempo. Las descargas parciales fueron erosionando la pintura conductora, dejando zonas eléctricamente flotadas, en la superficie de las bobinas. Finalmente, las descargas parciales erosionaron el sistema aislante, ocasionando una falla a tierra en un período de doce años. El objetivo es aportar esta experiencia al acervo técnico relacionado con los mecanismos de deterioro del sistema aislante de los generadores de alta tensión.

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Hydro Generator High Voltage Stator Windings: Part 1 – Essential Characteristics and Degradation Mechanisms

Cited by 6 publications

References 5 publications

Winding Type Alternation of a Refurbished Old Generator

Winding Type Alternation of a Refurbished Old Generator

Study on the Effect of SiO₂ Content on the Properties of Epoxy Resin

Deterioro de Generadores de Alta Tensión Ocasionado por la Separación de la Pintura Conductora en las Bobinas del Estator

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Hydro Generator High Voltage Stator Windings: Part 1 – Essential Characteristics and Degradation Mechanisms

Cited by 6 publications

References 5 publications

Winding Type Alternation of a Refurbished Old Generator

Winding Type Alternation of a Refurbished Old Generator

Study on the Effect of SiO2 Content on the Properties of Epoxy Resin

Deterioro de Generadores de Alta Tensión Ocasionado por la Separación de la Pintura Conductora en las Bobinas del Estator

Contact Info

Product

Resources

About

Study on the Effect of SiO₂ Content on the Properties of Epoxy Resin