Detection of high-energy ionizing radiation generated by electrical discharges in oil

Nagi, Łukasz; Zmarzły, D.; Boczar, T.; Frącz, Paweł

doi:10.1109/tdei.2016.7556476

Cited by 26 publications

(13 citation statements)

References 16 publications

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“…As the energy of the X-ray is greater than most disturbances in the substation [25], X-ray imaging detection also has the advantages of interference immunity. However, it may also ionize the SF 6 inside of GIS.…”

Section: Introductionmentioning

confidence: 99%

Detection and Diagnosis of Defect in GIS Based on X-ray Digital Imaging Technology

Pang

Jia

et al. 2020

Energies

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For better application of X-ray digital imaging technology in defect detection in Gas Insulated Switchgear (GIS), it is essential to investigate the typical defect and establish the defect database, which has not been adequately performed in previous work. Systematic experimental research is also needed to accumulate data and experience. In this research, an experimental platform, including Computed Radiography (CR) imaging system and a GIS model, is built, and extensive tests of different kinds of typical defects are studied. The influence X-ray irradiation on SF6 under different tube voltage levels is firstly examined, which proves that the withstand voltage of SF6 gas has not been affected and no dissociation has been found. Then, several kinds of defects are tested by X-ray digital imaging technology. The successful application examples of “visual” detection of defects further prove the practicability and validity of the X-ray digital imaging technique. Finally, the image database of typical defects inside of GIS is established and the defect risk is also analyzed in three levels, which would be useful for the defect severity diagnosis and risk assessment.

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Section: Introductionmentioning

confidence: 99%

Detection and Diagnosis of Defect in GIS Based on X-ray Digital Imaging Technology

Pang

Jia

et al. 2020

Energies

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“…Clamp-on highfrequency current transformers (HFCTs) are mostly used for diagnostic purposes if no bushing tap measurement or coupling capacitors are available. Furthermore, emission of light and ionizing radiation [6,7] can be used for PD diagnostic purposes. Usually, in the case of power transformers, the structure and the available measurement devices limit the application of these measurement techniques.…”

Section: Introductionmentioning

confidence: 99%

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers

Siegel¹,

Coenen

Beltle

et al. 2019

Energies

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The continuous, non-intermitted service of electrical grids relies on the reliability of their assets, e.g., power transformers. Local insulation defects can result in serve failures such as breakdowns with severe subsequent costs. The prevention of such events is crucial. Hence, partial discharge (PD) activity at power transformers is evaluated directly in the factory before shipment. Additionally, PD activity can be monitored during service using the ultra-high frequency (UHF) method. In this contribution, a calibration procedure is proposed for the UHF method. The calibration process is required to ensure both, reproducibility and comparability of UHF measurements: Only a calibrated UHF measurement procedure can be introduced supplementary to IEC 60270 in acceptance tests of power transformers. The proposed calibration method considers two factors: The influence of the UHF-antenna's sensitivity and the PD recorder characteristics including accessories such as cable damping, pre-amplifier, etc. The former is addressed by a characterization of UHF sensors using the standard antenna factor (AF) in a gigahertz transverse electromagnetic (GTEM) cell. The PD recorder's influence is corrected by using a defined, invariable test signal as reference for all recording devices. A practical evaluation of the proposed calibration procedure is performed in a laboratory setup using different UHF recording devices and UHF sensors using artificial PD signals and real voltage-driven PD sources.

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“…PD detection is proved to be one of the most effective insulation condition monitoring tools. There are many well-known and widespread PD detection methods but only electrical method (EM) supports a calibrated apparent charge measurement [4][5][6][7][8][9]. Measurement methodology and procedures are described in IEC 60270 standard.…”

Section: Introductionmentioning

confidence: 99%

Comparison of capacitive and inductive sensors designed for partial discharges measurements in electrical power apparatus

Kunicki

2017

E3S Web Conf.

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Abstract. In the paper results of simultaneously conducted measurements achieved using capacitive and inductive sensors are presented according to different PD model sources immersed in a mineral transformer insulation oil. All measurements are preceded under laboratory conditions using typical measurement set up commonly applied for on-site PD detection: measuring impedance and capacitor and high frequency current transformer (HFCT) are used respectively. Measuring frequency and voltage level influence as well as phase resolved PD patterns analysis are investigated in the research. Various fundamental PD signal descriptors assigned for selected frequencies are also proposed and compared for chosen sensors. The main purpose of the presented research is to compare PD measurement results achieved using selected type of sensors during laboratory measurements and to point the best application areas in fields of PD detection in high voltage apparatus under normal operating conditions. Furthermore a proper measurement results interpretation coming from different sensors as well as measurement conducting problems and achieved patterns disparities are also discussed in the paper.

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Detection of high-energy ionizing radiation generated by electrical discharges in oil

Cited by 26 publications

References 16 publications

Detection and Diagnosis of Defect in GIS Based on X-ray Digital Imaging Technology

Detection and Diagnosis of Defect in GIS Based on X-ray Digital Imaging Technology

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers

Comparison of capacitive and inductive sensors designed for partial discharges measurements in electrical power apparatus

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