Frequency Domain Spectroscopy for Non-Uniformly Distributed Moisture Detection in Transformer Bushings

Dai, Quanmin; Liu, Yanxia; Cheng, Guang

doi:10.1109/access.2020.3038686

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Establish a simulation model for the parameters of this type of bushing and conduct in-depth analysis of the cause of the fault. According to the external drawing and on-site measurement parameters [9], the internal capacitance layer of the core is calculated using the self-developed "ultra high voltage bushing calculation software", Set the capacitance of the core C1 to 602pF, which is basically close to the C1 value of 597pF on the bushing nameplate. The material parameter settings are shown in Table 1.…”

Section: Simulation Modelingmentioning

confidence: 99%

Analysis of Transformer GSB Bushing Fault Causes Based on Finite Element Simulation

Xu,

Liu,

et al. 2024

J. Phys.: Conf. Ser.

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In response to a sudden explosion and fire fault during the operation of a GSB dry-type transformer bushing in a certain power grid company, based on the structural parameters of the bushing measured by the supplier and on-site, a reverse design of the capacitor core was carried out on the faulty bushing. Based on the measured parameters and reverse design results, a finite element simulation model of the bushing electric field and structural force field was established. Calculate the electric field distribution of the casing under normal operation, 60s power frequency withstand voltage, lightning impulse, operation impulse, and other operating conditions; Conduct finite element simulation of structural mechanics to calculate the stress distribution of the casing under conditions such as cantilever load and short circuit impact; Based on the discharge traces discovered during disassembly, simulation calculations were conducted by assuming the defect situation of the casing, and the electric field distribution of the casing under different defect types was quantitatively analyzed. The simulation calculation results of the electric field under various working conditions have verified that the occurrence of this fault is the result of multiple defects working together, providing quantitative support for fault analysis and providing a certain reference for the operation and maintenance of similar casings.

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Section: Simulation Modelingmentioning

confidence: 99%

Analysis of Transformer GSB Bushing Fault Causes Based on Finite Element Simulation

Xu,

Liu,

et al. 2024

J. Phys.: Conf. Ser.

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“…One key factor compromising the integrity of OIP bushing's insulation system is moisture [5]. Moreover, three sources can be considered for presented moisture in the condenser core of bushings: 1) moisture absorption from the environment through the cracked sealing or leaky gaskets [6], which causes almost 90% of failures in bushings, 2) remaining moisture related to the production process of bushings, and 3) generated moisture related to the oil-paper's ageing [1,7]. Therefore, it is fair to say that the assessment of the moisture content in OIP bushings plays an essential role in the safe operation of power systems.…”

Section: Introductionmentioning

confidence: 99%

Assessing the moisture content of oil‐impregnated paper bushings with a simple and fast method

Ansari,

Vahedi

2023

IET Electric Power Appl

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Power outages can cause harm to both society and individual health. Among the crucial elements of power systems, power transformers play a vital role, and their failures can lead to incidents and disruptions. According to statistics, almost 50% of the explosions and fires in the power transformer are caused by oil‐impregnated paper (OIP) bushing failures. Moreover, moisture is a crucial factor that affects the health of OIP bushings, and assessing the moisture level in OIP bushings is vital to guarantee the safety of power systems. While the frequency‐domain dielectric spectroscopy (FDS) method has been widely used to assess the moisture content of OIP bushings on‐site, it has the disadvantage of requiring a long measurement time. Therefore, a novel technique was proposed in this study that involves measuring the OIP bushing dissipation factor (tanδ) at 1 Hz to estimate the moisture content in a significantly shorter time. Five samples of OIP with various moisture levels have been selected, and an equation based on the OIPs' value of tanδ at 1 Hz was proposed to assess the moisture level of OIP bushings. Furthermore, the validity of the proposed method was successfully verified, proving its precision and time efficiency.

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Influence of temperature on frequency domain spectroscopy detection of transformer bushings

Gu¹,

Gu²,

Zhu³

et al. 2022

Energy Reports

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Frequency Domain Spectroscopy for Non-Uniformly Distributed Moisture Detection in Transformer Bushings

Cited by 7 publications

References 12 publications

Analysis of Transformer GSB Bushing Fault Causes Based on Finite Element Simulation

Analysis of Transformer GSB Bushing Fault Causes Based on Finite Element Simulation

Assessing the moisture content of oil‐impregnated paper bushings with a simple and fast method

Influence of temperature on frequency domain spectroscopy detection of transformer bushings

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