Testing of Dielectric Strength of Transformer Oil, Insulation Paper and Corona Effect of Wire

Ashiquzzaman, Md.; Mitra, Shuva; Molla, Nur Mohammad; Chakma, Tonoy; Nasrin, Kazi Farjana

doi:10.1109/tensymp50017.2020.9230655

Cited by 4 publications

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“…Ashiquzzaman et al [11] have tested the breakdown strength of transformer oil and insulation paper and also tested the corona effect of various conductors as per ASTM and IEC standards.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of moisture and sonication time on dielectric strength and heat transfer performance of transformer oil based Al2O3 nanofluid

Babu¹,

Kumar²,

Babu³

2021

IJATEE

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Power transformer's role is very much critical in transmission and distribution of electricity to the consumers from power stations. The insulating liquid is crucial to the performance of the transformer [1]. Transformers expose to various stresses like thermal, electric, and chemical during their operation. Periodical check-ups and maintenance of insulating oil in the transformer are very much required to prevent sudden failure [2]. One of the most detrimental elements to transformer paper and oil insulation is moisture. It weakens the dielectric and lowers the partial discharge (PD) inception voltage, affects the electrical characteristics [3]. Aging and external causes are the two most important variables that encourage moisture intrusion in transformers. The moisture equilibrium characteristics of oil and paper insulation are well-known and broadly applied to estimate how much moisture is involved. *Author for correspondence Oil, on the other hand, can loses its insulating properties if it is polluted by moisture, particles, or a combination of the two [4]. Moisture contamination is thought to happen when voltage load taps are changed, allowing moisture and gases to absorb. The deterioration of the paper insulation between the transformer windings causes particle pollution [5].Transformers are built to withstand large loads, such as emergency and cold load pickup circumstances. As the load on the transformer grows, the internal temperature rises which in turn reduces the transformer's typical life expectancy. This process might take anything from months to years. Characteristics of a good cooling liquid include high thermal conductivity, low viscosity, high specific heat, high dielectric strength (in case of direct liquid cooling), high surface tension, chemical inertness, chemical stability, low freezing point, and melting points, and low cost. Insulating liquids need to retain their electrical and thermo-physical properties for a long time [6]. But in practice, after using those oils for a long time they lose their properties. In order to

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“…Ashiquzzaman et al [11] have tested the breakdown strength of transformer oil and insulation paper and also tested the corona effect of various conductors as per ASTM and IEC standards.…”

Section: Literature Reviewmentioning

confidence: 99%