Gelling behaviour of natural ester transformer liquid under thermal ageing

Lü, Weitao; Liu, Qiang; Wang, Zhongdong

doi:10.1109/ichve.2012.6357101

Cited by 12 publications

(8 citation statements)

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“…10. The relationship between 50% AC breakdown strength and dynamic viscosity and total acid number measurements in this paper and [8]; viscosity measured at test temperature of 40 ˚C.…”

Section: B Ac Breakdown Strength (Kv/mm)mentioning

confidence: 80%

“…10. As a reference, the relationship between viscosity and acidity of natural ester with 20 mm thickness obtained in [8] is also plotted in Fig. 10.…”

Section: B Ac Breakdown Strength (Kv/mm)mentioning

confidence: 99%

“…Facing toward the further application in free-breathing transformers, the gelling/oxidation process of natural ester should be studied. In our previous paper [8], gelling/oxidation behaviours of thin films of a natural ester were investigated under accelerated thermal ageing at 120 ˚C. Total acid number and dynamic viscosity were measured periodically to monitor the gelling progress.…”

Section: Introductionmentioning

confidence: 99%

“…the thinner the film is, the faster the gelling speed will be, as shown in Fig. 1 [8]. However, there is no publication describing the electrical performance of natural ester when it is turning to gelled form.…”

Section: Introductionmentioning

confidence: 99%

“…Dynamic viscosity in log scale vs. ageing time of samples with different film thicknesses at test temperature of 90 ˚C[8].…”

mentioning

confidence: 99%

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AC breakdown strength of a natural ester transformer liquid under accelerated thermal ageing

Lü¹,

Liu²,

Wang³

2016

2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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In recent years, there is an increasing interest in applying natural esters as the alternative to mineral oils in large power transformers. But the low resistance to oxidation/gelling process poses a challenge for applying natural esters in freebreathing transformers. Some previous studies presented the gelling/oxidation behaviour of natural esters in terms of physical and chemical properties. There is a lack of study considering the electrical performance of natural ester during the gelling process. In this paper, the AC breakdown strength of a natural ester from liquid state to totally gelled state was determined. Test cells with a 1 mm sphere-sphere electrode gap were used to hold ester samples. The ester samples and the test cell were aged together in an air-circulating oven at 120 ˚C. Dynamic viscosity of the ester samples was also measured to monitor the oxidation/gelling process. Results showed that dynamic viscosity of the natural ester increases more than 100 times during the gelling process. But unlike the rapidly changing physical parameter, AC breakdown strength of the natural ester remains stable during the whole ageing process till the natural ester turns into totally gelled form.

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“…10. The relationship between 50% AC breakdown strength and dynamic viscosity and total acid number measurements in this paper and [8]; viscosity measured at test temperature of 40 ˚C.…”

Section: B Ac Breakdown Strength (Kv/mm)mentioning

confidence: 80%

“…10. As a reference, the relationship between viscosity and acidity of natural ester with 20 mm thickness obtained in [8] is also plotted in Fig. 10.…”

Section: B Ac Breakdown Strength (Kv/mm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Dynamic viscosity in log scale vs. ageing time of samples with different film thicknesses at test temperature of 90 ˚C[8].…”

mentioning

confidence: 99%

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