Application of gas insulated transformers to underground substations in Japan

Tsukao, S.; Oue, Y.; Hasegawa, Y.

doi:10.1109/tdc.2002.1178440

Cited by 6 publications

(2 citation statements)

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“…Furthermore, they allow for the rationalization of anti-disaster facilities because the use of an incombustible insulating medium, SF 6 gas, eliminates fire risks. In view of these advantages in construction costs and safety, the number of gas-filled transformers is expected to continue increasing in future [1,2].…”

Section: Gas-filled Power Transformers Became Commerciallymentioning

confidence: 99%

Partial discharge signal propagation characteristics inside the winding of gas-filled power transformer - experimental study using winding models in the air

Okabe

Ueta

Wada

2011

IEEE Trans. Dielect. Electr. Insul.

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To establish clear control criteria for a partial discharge (PD) test of long duration ac withstand voltage test of a gas-filled power transformer, the authors have conducted a study on the harmful PD level of materials themselves using the insulating material-and structuralmodels of an actual gas-filled power transformer. In the PD test on an actual transformer, since the PD having occurred inside the transformer is measured from the outside, the measured signal is damped due to various influential factors, such as the position of occurrence, measurement position, and internal structure of the equipment. In particular, in the event of the PD between sections or turns, which might actually occur, significant damping of the signal is anticipated in certain cases due to the influence of the position of occurrence and the internal structure of the equipment, which is a propagation path. Therefore, this damping must be taken into consideration to establish control criteria for the PD. In this paper, to understand the characteristics of this damping, such as its magnitude, two types of winding, interleaved disk and continuous disk, were produced as transformer models to investigate the propagation characteristics of PD signals with the position of occurrence, measurement position, and wavefront duration of the PD as parameters. Consequently, it emerged that, where the PD occurs between sections or turns, the transmission rate at the measurement position was generally low because the PD signal circulates within the PD occurrence parts and does not come outside. Assuming measurement at the bushing test terminal, the lowest transmission rate was 2.8% and 2.0% between sections and turns, respectively. A study was also conducted on the occurrence of the PD against ground, despite the low anticipated potential of actual occurrence, and the lowest transmission rate was 4.0%. Accordingly, the PD having occurred inside the winding of the transformer can be detected with a magnitude of 2% or more; however, from a reverse perspective, the signal is detected as one significantly damped to a level of about 1/50. Index Terms -Gas-filled power transformer, partial discharge (PD), pulse propagation characteristics, transmission rate, interleaved disk winding, continuous disk winding, ERA.

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Section: Gas-filled Power Transformers Became Commerciallymentioning

confidence: 99%

Partial discharge signal propagation characteristics inside the winding of gas-filled power transformer - experimental study using winding models in the air

Okabe

Ueta

Wada

2011

IEEE Trans. Dielect. Electr. Insul.

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“…However, mineral oil has the disadvantages of low ignition point and non-degradability, and its application in confined spaces, such as buildings and rail transit, bring certain safety hazards [2]. The gas-insulated transformer (GIT) has the advantages of compact structure, low noise and non-flammability, which can meet the needs of special working conditions [3,4]. However, the sulphur hexafluoride (SF 6 ) currently used in GIT is a highly potent greenhouse gas with a global warming potential (GWP) of 24,300 and an atmospheric lifetime of 3200 years [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C₄F₇N/CO₂ gas mixture for eco‐friendly gas insulating transformer

Xiao,

Wang,

Ren

et al. 2024

High Voltage

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The eco‐friendly insulating gas perfluoroisobutyronitrile (C4F7N) is potentially used in gas‐insulated transformers (GIT) to replace sulphur hexafluoride (SF6). However, evaluation of the long‐term insulation reliability and gas–solid interface discharge decomposition characteristics of the gas–solid film insulation structure in GIT is indispensable. The authors simulated the gas–solid film insulation structure in GIT and explored the interface partial discharge (PD) characteristics of C4F7N/CO2 gas mixture with polyethylene terephthalate (PET). The effect of gas pressure, mixing ratio on gas–solid interface gas decomposition, PET degradation was investigated, and the interaction mechanism was analysed. It is found that the interface PD generated three degradation regions on a PET film. The gas–solid interface reaction in the electrode contact region and the discharge development trace was significantly higher than that of halation region. The content of gas decomposition products decreases with the increase of gas pressure and the PD intensity of SF6‐PET is inferior to that of C4F7N/CO2 under the same condition. Relevant results provide reference for the development and application of C4F7N/CO2 based GIT.

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SF₆ Transformer Force-Directed-Gas Duct Design Based on Thermal-Fluid Coupled Analysis Method

Guo

Lin

Fang

et al. 2007

2007 International Conference on Electrical Machines and Systems (ICEMS)

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Application of gas insulated transformers to underground substations in Japan

Cited by 6 publications

References 0 publications

Partial discharge signal propagation characteristics inside the winding of gas-filled power transformer - experimental study using winding models in the air

Partial discharge signal propagation characteristics inside the winding of gas-filled power transformer - experimental study using winding models in the air

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C₄F₇N/CO₂ gas mixture for eco‐friendly gas insulating transformer

SF₆ Transformer Force-Directed-Gas Duct Design Based on Thermal-Fluid Coupled Analysis Method

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Application of gas insulated transformers to underground substations in Japan

Cited by 6 publications

References 0 publications

Partial discharge signal propagation characteristics inside the winding of gas-filled power transformer - experimental study using winding models in the air

Partial discharge signal propagation characteristics inside the winding of gas-filled power transformer - experimental study using winding models in the air

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C4F7N/CO2 gas mixture for eco‐friendly gas insulating transformer

SF6 Transformer Force-Directed-Gas Duct Design Based on Thermal-Fluid Coupled Analysis Method

Contact Info

Product

Resources

About

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C₄F₇N/CO₂ gas mixture for eco‐friendly gas insulating transformer

SF₆ Transformer Force-Directed-Gas Duct Design Based on Thermal-Fluid Coupled Analysis Method