Partial discharges in a cavity embedded in oil-impregnated paper: effect of electrical and thermal aging

Niasar, Mohamad Ghaffarian; Taylor, Nathaniel; Janus, Patrick; Wang, X.; Edin, Hans; Kiiza, Respicius Clemence

doi:10.1109/tdei.2015.7076808

Cited by 44 publications

(26 citation statements)

References 20 publications

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“…In this paper, the concentration of dissolved gases is set to around 20,000 µL/L, which is an abnormal condition for the transformer as it close to the condition Level 2 in CIGRE 443 (17,193 µL/L). and IEC 60599 (20,750 µL/L), and also higher than that defined in IEEE C57.104 (condition Level 3, 16,030 µL/L).…”

Section: High Voltage Generation Unitmentioning

confidence: 99%

“…• Cavity discharge (partial discharge in spherical cavities or gaps within a solid dielectric material) within insulation papers or pressboards [13][14][15][16][17][18][19][20][21], • Surface discharge in oil [13][14][15][16], • PD due to floating particles in oil [17,22], • Air bubble discharge in oil [14,17,22,23], • PD due to bad grounding (metal-to-metal discharge) [13], and • Oil wedge or metal protrusions caused PD in pure oil [13,22,[24][25][26][27].…”

mentioning

confidence: 99%

“…It has been proved by Niasar et al [17] that the PD incipient voltage and the breakdown voltage are directly affected by the degree of aging of the insulation paper due to thermal stresses. Besides, Tsuchie et al [20] found that the synergistic effect of thermal and electrical stress has a great impact on the PD characteristics.…”

mentioning

confidence: 99%

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Influences of Traction Load Shock on Artificial Partial Discharge Faults within Traction Transformer—Experimental Test for Pattern Recognition

Gao

et al. 2017

Energies

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Partial discharge (PD) measurement and its pattern recognition are vital to fault diagnosis of transformers, especially to those traction substation transformers undergoing repetitive traction load shocks. This paper presents the primary factors induced by traction load shocks including high total harmonics distortion (THD), transient voltage impulse and high-temperature rise, and their effects on the feature parameters of PD. Experimental tests are conducted on six artificial PD models with these factors introduced one by one. Results reveal that the maximum PD quantity and the PD repetitive rate are favorable to be enlarged when the oil temperature exceeds 80 • C or the THD is higher than 16% with certain orders of harmonic. The decline in PD inception voltage can mainly be attributed to the transient voltage impulse. The variation in central frequency of the fast Fourier transformation (FFT) spectra transformed from ultra-high frequency signals can mainly be attributed to high THD, especially when it exceeds 20%. The temperature rise has no significant influence on the FFT spectra; the transient voltage impulse, however, can result in a central frequency shift of the floating particle discharge. With the rapid development of high-speed railways, the study presented in this paper will be helpful for field PD detection and recognition of traction substation transformers in the future.

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Section: High Voltage Generation Unitmentioning

confidence: 99%

mentioning

confidence: 99%

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Influences of Traction Load Shock on Artificial Partial Discharge Faults within Traction Transformer—Experimental Test for Pattern Recognition

Gao

et al. 2017

Energies

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“…Assessment of insulation condition can be obtained by partial discharge (PD) monitoring [2]. For instance, some authors [3][4][5][6][7][8] have analysed the effect of oil and pressboard ageing (electrical and/or thermal) on the characteristic of PD from inception to flashover, surface discharge inception voltage (SDIV) variation, creepage discharge inception voltage (CDIV) or creepage discharge flashover voltage (CDFV) of oil/solid insulation specimens with different ageing degrees. Other authors have studied the effect of polarity on the accumulation of charges at the oil-solid interface [9], the accumulative effect of repeated lightning impulses and its damage mechanism [10], the electrical deterioration caused by PD under long-term AC voltage [11] or the performance of alternative liquids in comparison with mineral oil [12].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Fernández-Diego¹,

Fernández²,

Fernández³

et al. 2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Power transformers life is limited fundamentally by the insulation paper state, which can be analysed through different techniques such as furanic compound concentration, dissolved gases, methanol concentration, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, refractive index of cellulose fibres, degree of polymerisation or tensile strength. The two last techniques provide the best way to evaluate mechanical resistance of insulation paper. This chapter describes briefly the most remarkable studies about post-mortem assessment and thermal ageing tests in which mechanical properties are some of the characteristics evaluated to determine paper degradation. This work also gathers the main relationships developed until now to relate different by-products generated during transformer operation with loss of paper mechanical properties. Finally, this chapter defines the future approaches, which could be used to study paper degradation.

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“…The thickness of the three-plate composite is 2.4 mm. The HV electrode is made from stainless steel with a well-rounded edge to avoid surface discharge from regions of elevated field strength [15].…”

Section: Introductionmentioning

confidence: 99%

Validation of partial discharge emulator simulations using free-space radiometric measurements

Jaber

Lazaridis

Saeed

et al. 2016

2016 International Conference for Students on Applied Engineering (ISCAE)

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A useful technique to estimate the degradation of insulation in high voltage (HV) installations is the measurement of partial discharge (PD). Free-space radiometric (FSR) detection of PD is a relatively new technique. Several types of PD emulator sources have been constructed: two internal PD emulators and a floating electrode emulator. The emulators have been simulated using the CST Microwave Studio software package. The intention is to use the simulated emulators to establish a relationship between radiated PD signals and PD intensity as defined by apparent charge transfer. To this end the radiated fields predicted in the simulations are compared with measurements. There is sufficient agreement between simulations and measurements to suggest the simulations could be used to investigate the relationship between PD intensity and the field strength of radiated signals.

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Partial discharges in a cavity embedded in oil-impregnated paper: effect of electrical and thermal aging

Cited by 44 publications

References 20 publications

Influences of Traction Load Shock on Artificial Partial Discharge Faults within Traction Transformer—Experimental Test for Pattern Recognition

Influences of Traction Load Shock on Artificial Partial Discharge Faults within Traction Transformer—Experimental Test for Pattern Recognition

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Validation of partial discharge emulator simulations using free-space radiometric measurements

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