Study on the impact of initial moisture contents on ageing characteristics of transformer oil-paper insulation

Xia, Guoqiang; Wu, Guangning

doi:10.1109/ichve.2016.7800632

Cited by 10 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, it is found that the internal porosity will increase with increased aging of the pressboard [35]. To study the influence of aging on the PD of pressboard, one, three, five, and seven bubbles are modelled in the pressboard to simulate aging over 8,16,32, and 48 days.…”

Section: Simulation Analysis Of the Influence Of Aging On Electric Fimentioning

confidence: 99%

See 1 more Smart Citation

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Wang

Zhang

Jiang

et al. 2019

IET Science, Measurement & Technology

View full text Add to dashboard Cite

Section: Simulation Analysis Of the Influence Of Aging On Electric Fimentioning

confidence: 99%

“…Oil-paper insulation is the main form of internal insulation in power transformers [7][8][9][10]. There is much research available into the aging of oil-paper insulation and the factors affecting PD therefrom [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Wang

Zhang

Jiang

et al. 2019

IET Science, Measurement & Technology

View full text Add to dashboard Cite

“…The oil-immersed transformer is the crucial equipment in power system. The major insulation of oil-immersed transformer is oil-paper insulation, and undergoes degradation by several factors, such as thermal, electrical stresses, and especially water content [1,2]. Water content can not only reduce the dielectric properties of transformer, but also accelerate the aging process and significantly shorten the transformer life [3,4].…”

Section: Introductionmentioning

confidence: 99%

Moisture Assessment of Oil-Immersed Paper Based on Dynamic Characteristics of Frequency Domain Spectroscopy

Wang

Lin

et al. 2022

IEEE Access

View full text Add to dashboard Cite

In on-site measurement, as the transformer's structure is often unknown, the application of frequency domain spectroscopy (FDS) is greatly limited in moisture assessment of transformer. This paper proposes a moisture assessment method for oil-immersed paper based on the dynamic characteristic frequency even for an unknown transformer structure. FDS tests are performed on the oil-paper insulation, corresponding oil-immersed paper, and mineral oil under different moisture conditions. The moisture criterion of oil-immersed paper and the influence of the structural parameters on the calculated frequency spectroscopy at different frequencies are discussed. It is concluded that the moisture criterion's effectiveness, which indicates the sensitivity of assessed moisture content to the error of the tanδ, changes at different frequencies. Moreover, there are some frequencies at which tanδ is not influenced by structural parameters and is close to the measured value, which are regarded as "characteristic frequencies". Based on the characteristic frequency, the moisture content of oil-immersed paper is assessed according to the frequency spectroscopy of oil-paper insulation without the structural parameters. The result shows that the assessing frequency changes under different moisture conditions, and the error of the assessed moisture content is less than 0.1%.INDEX TERMS frequency domain spectroscopy (FDS), oil-paper insulation, oil-immersed paper, moisture assessment, dynamic characteristic

show abstract

“…These bonds have relatively low temperature resistance in relation to hydrocarbon bonds prevailing in DSPV transformer oil [8]. This degradation phenomenon triggers depolymerisation which leads to degraded forms of glucose as shown in Figure 1 [9]. The formation of glucose will further degrade to forge furans, water and combustible gases [9 -11].…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Estimating the Service Lifetime of Transformers within Distributed Solar Photovoltaic (DSPV) Systems

Thango¹,

Jordaan²,

Nnachi³

2021

Adv. sci. technol. eng. syst. j.

View full text Add to dashboard Cite

The rapid transformation of the energy sector in South Africa towards renewable energy (RE) production calls for the management of assets to keep pace with the ongoing developments in a reliable manner. Aging assets, increasing energy needs and reliable supply of energy without load shedding are some of the challenges utilities are facing in South Africa. In resolving these challenge, imaginative solutions are required to maintain the installed assets and determining the viability of refurbishment, replacement or upgrading. In the current work, an extension of the author's previous work, a novel approach for estimating the service lifetime of transformers within Distributed Solar Photovoltaic (DSPV) Systems in South Africa is introduced. This experiential form has been derived by extensive experimental trials. The proposed approach is initially employed to evaluate the Degree of polymerization (DP) of cellulose insulation based on measured furan (2FAL) contents of 9 case scenarios. The calculated DP is then used to evaluate the service lifetime of these units. In efforts to authenticate the proposed approach, a comparative study is conducted against 5 other models. Finally, the proposed approach is compared with the results of the measured DP. It is observed that the proposed approach produce accurate estimates with an approximation not exceeding 1% and 2.2% from the measured DP and service lifetime respectively.

show abstract

Study on the impact of initial moisture contents on ageing characteristics of transformer oil-paper insulation

Cited by 10 publications

References 6 publications

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Moisture Assessment of Oil-Immersed Paper Based on Dynamic Characteristics of Frequency Domain Spectroscopy

A Novel Approach for Estimating the Service Lifetime of Transformers within Distributed Solar Photovoltaic (DSPV) Systems

Contact Info

Product

Resources

About