Electrical insulating liquid: A review

Mahanta, Deba Kumar; Laskar, Shakuntala

doi:10.1142/s2010135x17300018

Cited by 54 publications

(26 citation statements)

References 29 publications

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“…China, along with the rest of the world, is rapidly entering a UHV era. As the properties of insulating oil and its aging by-product were proved to have close relation to the operation life of power transformers [13][14][15][16][17]. The continuous rise of the voltage level of power grids and continuous increase of loads mean that insulating materials now face unprecedented challenges.…”

Section: High Antioxidation Stabilitymentioning

confidence: 99%

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

et al. 2018

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Abstract:In November 2017, the first ±1100 kV high-voltage direct-current power transformer in the world, which was made by Siemens in Nurnberg, passed its type test. Meanwhile, in early 2017, a ±1000 kV ultra-high voltage (UHV) substation was officially put into operation in Tianjin, China. These examples illustrate that the era of UHV power transmission is coming. With the rapid increase in power transmission voltage, the performance requirements for the insulation of power transformers are getting higher and higher. The traditional mineral oils used inside power transformers as insulating and cooling agents are thus facing a serious challenge to meet these requirements. In this review, the basic properties of traditional mineral insulating oil are first introduced. Then, the variation of electrical properties such as breakdown strength, permittivity, and conductivity during transformer operation and aging is summarized. Next, the modification of mineral insulating oil is investigated with a focus on the influence of nanoparticles on the electrical properties of nano-modified insulating oil. Recent studies on the performance of mineral oil at molecular and atomic levels by molecular dynamics simulations are then described. Finally, future research hotspots and notable research topics are discussed.

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Section: High Antioxidation Stabilitymentioning

confidence: 99%

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

et al. 2018

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“…Liquid insulation with its bifunctional characteristics are mandatory from huge power transformer to µ-electronics heat sink. Its development originates from various synthetic and natural liquid dielectrics consisting of synthetic hydrocarbons [30]- [32], silicone oils [33]- [36], synthetic esters [37]- [39], vegetable oils [40]- [43], and hybrid oil as classified on the basis of applications in Figure 1. The specific applications of a dielectric liquid overridden by the intermixing of different oil to obtain the specific properties of insulant have been evaluated for over a decade [44]- [48].…”

Section: Historymentioning

confidence: 99%

State-of-Art in Nano-Based Dielectric Oil: A Review

Ahmad

Khan

et al. 2019

IEEE Access

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Dielectric fluids or commonly oils serve as the protection of any power utility components, which make it selection crucial for utility. Due to its significance, consistent research has been performed and new insulants have been introduced for power utilities to attain better, reliable, and a longer lifespan than the former one. Nanotechnology-based insulating liquids are still under research but show the potential to achieve the objective of smart and futuristic insulation. This paper provides the critical review for the development of insulating liquid and promising results shown by the nanoparticles dispersed fluid termed nanofluids. The state-of-the-art research illustration includes synthesis, experimental investigation, and dielectric and physio-mechanical characterization of nanofluids. The enhancements in the characteristics of nanofluids are elucidated along with its possible mechanisms and shortcomings. INDEX TERMS Liquid dielectric, nanofluids, mineral oil, natural oil, nanoparticles, dielectric response, breakdown characteristics.

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“…This situation has led to the development of alternative transformer oils such as silicones, synthetic and natural esters. In particular, vegetal oils have drawn most attention and research [54].…”

Section: Accelerated Thermal Ageing In Laboratorymentioning

confidence: 99%

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Fernández-Diego¹,

Fernández²,

Fernández³

et al. 2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Power transformers life is limited fundamentally by the insulation paper state, which can be analysed through different techniques such as furanic compound concentration, dissolved gases, methanol concentration, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, refractive index of cellulose fibres, degree of polymerisation or tensile strength. The two last techniques provide the best way to evaluate mechanical resistance of insulation paper. This chapter describes briefly the most remarkable studies about post-mortem assessment and thermal ageing tests in which mechanical properties are some of the characteristics evaluated to determine paper degradation. This work also gathers the main relationships developed until now to relate different by-products generated during transformer operation with loss of paper mechanical properties. Finally, this chapter defines the future approaches, which could be used to study paper degradation.

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Electrical insulating liquid: A review

Cited by 54 publications

References 29 publications

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers

State-of-Art in Nano-Based Dielectric Oil: A Review

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

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