Study of the Impact of Initial Moisture Content in Oil Impregnated Insulation Paper on Thermal Aging Rate of Condenser Bushing

Wang, Youyuan; Xiao, Kun; Chen, Bijun; Li, Yuanlong

doi:10.3390/en81212429

Cited by 14 publications

(9 citation statements)

References 27 publications

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“…Wang et al [7] investigated the influence of initial moisture contents in oil impregnated paper of the condenser bushing. The results of their experience indicated that the initial moisture content has appreciable impact on the degradation of the insulation paper during the initial aging period.…”

Section: A Review Of the Special Issuementioning

confidence: 99%

Power Transformer Diagnostics, Monitoring and Design Features

Fofana

Hadjadj

2018

Energies

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Section: A Review Of the Special Issuementioning

confidence: 99%

Power Transformer Diagnostics, Monitoring and Design Features

Fofana

Hadjadj

2018

Energies

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“…A simplified HV bushing structure [21][22][23], as shown in Figure 2a, was set up. This structure consisted of three layers from the outside to the inside.…”

Section: Specimenmentioning

confidence: 99%

The Effect of a Vertical Electric Field on the Surface Flashover Characteristics of a Bushing Model

et al. 2018

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High-voltage bushings play a crucial role in energy conveyance. Their specialized electric structure makes the bushing more vulnerable to surface discharge. However, the influence of a vertical electric field on the surface flashover of bushing structures remains unclear. To investigate this mechanism, four simplified bushing samples were built and the influence of pollution, leakage length, and the electric field component vertical to the dielectric surface on flashover properties of the bushing samples were tested. It was found that the surface pollution level was the decisive factor that influenced flashover voltage. When the leakage length and form factor were the same, the pollution flashover of the bushing structure was lower than that of the post structure. It was also found that increasing the leakage length was not very effective in improving the flashover voltage of bushings when the equivalent salt deposit density (ESDD) was high. No obvious correlation was found between pollution flashover voltage and electric field stress. Furthermore, the uneven wetting flashover performance of the bushings was tested. Under this condition, the flashover voltage decreased with an increase of the electric field component vertical to the dielectric surface. In addition, the electric field distribution of the samples was calculated and the results were in accordance with the experimental results.

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“…So, the characteristic Sm is modified to eliminate the influence of aging degree. The modified Sm is as shown in Equation (8). In Equation (8), λ is the increased value of Sm caused by the aging degree in insulating paper relative to the unaged insulating paper in frequency 10 1~1 0 3 Hz.…”

Section: Aging Compensation Factormentioning

confidence: 99%

“…So, the characteristic S m is modified to eliminate the influence of aging degree. The modified S m is as shown in Equation (8).…”

Section: Aging Compensation Factormentioning

confidence: 99%

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A New Method for Evaluating Moisture Content and Aging Degree of Transformer Oil-Paper Insulation Based on Frequency Domain Spectroscopy

Xia

Gao

et al. 2017

Energies

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Abstract:The condition of oil-paper insulation is closely related to the life expectancy of a transformer. The accurate results of oil-paper have not been obtained due to the impact of influencing factors. Therefore, in order to improve the evaluation accuracy of oil-paper insulation, in this paper, oil-paper samples which were prepared with different aging and moisture content were analyzed by frequency domain spectroscopy (FDS). Results show that when the moisture content is less than 2%, the range of 10 1~1 0 3 Hz is mainly affected by moisture and aging has little effect. However, with the increase of moisture content, the effect of aging degree on this band became increasingly prominent. S m , which represents the integral value from 10 −1 to 10 −3 Hz, and S DP , which represents the integral value from 10 1 to 10 3 Hz, were extracted as characteristic parameters of moisture content and aging degree respectively. Compensation factors γ which represents the influence ratio of moisture on S DP and φ which represents the influence ratio of aging on S m were introduced to compensate for the influence of moisture content and aging degree on characteristics respectively. Then, a new method was proposed to evaluate the condition of oil-paper based on compensation factors. Through this method, the influence in characteristics can be eliminated by the obtained actual compensation factors, thus distinguishing the internal influence between moisture content and aging degree on FDS. Finally, this method was verified by field test.

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Study of the Impact of Initial Moisture Content in Oil Impregnated Insulation Paper on Thermal Aging Rate of Condenser Bushing

Cited by 14 publications

References 27 publications

Power Transformer Diagnostics, Monitoring and Design Features

Power Transformer Diagnostics, Monitoring and Design Features

The Effect of a Vertical Electric Field on the Surface Flashover Characteristics of a Bushing Model

A New Method for Evaluating Moisture Content and Aging Degree of Transformer Oil-Paper Insulation Based on Frequency Domain Spectroscopy

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