A study on PD activities of oil-impregnated paper under pulse voltages using gas analysis

Khanali, Mahdi; Jayaram, S.

doi:10.1109/tdei.2017.006181

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…Today, the ubiquitous application of power electronics means that the electrical insulation of power equipment is exposed to various continuous impulse stresses. Example applications include high-voltage direct current (HVDC) systems, converter fed transformers, pulse-width modulation (PWM) driven motors which allow for fluctuation of the average value of the waveform or smart grids where the voltage levels of the system may be reconfigured to various voltage levels [8][9][10][11][12][13][14]. Electromobility brings a new class of challenges, where higher and higher voltage level will be involved in the power train of electric vehicle.…”

Section: Introductionmentioning

confidence: 99%

“…Boggs analysed the tree channel formation under impulse voltage and provided an analytical approach to breakdown under impulse conditions [30]. A study on PD activities in oil-impregnated paper under pulse voltages using gas analysis is shown in [13]. PD occurring due to oscillating impulse voltages has also been afforded considerable attention [28,31,32].…”

Section: Introductionmentioning

confidence: 99%

“…The ageing phenomena of XLPE and EPR cable insulation excited by switching impulses are presented in [36]. The correlation between dissolved gas content due to PD in oil/paper insulation and the train of impulse voltages is shown in [13]. In the case of HVDC systems, superimposed switching impulses with positive and negative DC offset along with resulting PD activity were analysed [9].…”

Section: Introductionmentioning

confidence: 99%

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Accumulative effect of partial discharges at impulse voltage wave tail

Florkowski

2020

IET Science, Measurement & Technology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accumulative effect of partial discharges at impulse voltage wave tail

Florkowski

2020

IET Science, Measurement & Technology

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“…As shown in Fig. 2, instantaneous load ramping leads to an instantaneous variation in the transformer operating temperature [21]- [24]. Practical measurements in Fig.…”

Section: Introductionmentioning

confidence: 99%

Impact of Load Ramping on Power Transformer Dissolved Gas Analysis

Cui

Yang

et al. 2019

IEEE Access

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Dissolved gas in oil analysis (DGA) is one of the most reliable condition monitoring techniques, which is currently used by the industry to detect incipient faults within the power transformers. While the technique is well matured since the development of various offline and online measurement techniques along with various interpretation methods, no much attention was given so far to the oil sampling time and its correlation with the transformer loading. A power transformer loading is subject to continuous daily and seasonal variations, which is expected to increase with the increased penetration level of renewable energy sources of intermittent characteristics, such as photovoltaic (PV) and wind energy into the current electricity grids. Generating unit transformers also undergoes similar loading variations to follow the demand, particularly in the new electricity market. As such, the insulation system within the power transformers is expected to exhibit operating temperature variations due to the continuous ramping up and down of the generation and load. If the oil is sampled for the DGA measurement during such ramping cycles, results will not be accurate, and a fault may be reported due to a gas evolution resulting from such temporarily loading variation. This paper is aimed at correlating the generation and load ramping with the DGA measurements through extensive experimental analyses. The results reveal a strong correlation between the sampling time and the generation/load ramping. The experimental results show the effect of load variations on the gas generation and demonstrate the vulnerabilities of misinterpretation of transformer faults resulting from temporary gas evolution. To achieve accurate DGA, transformer loading profile during oil sampling for the DGA measurement should be available. Based on the initial investigation in this paper, the more accurate DGA results can be achieved after a ramping down cycle of the load. This sampling time could be defined as an optimum oil sampling time for transformer DGA. INDEX TERMS Dissolved gas analysis, insulation oil, load ramping, power transformer. AHMED ABU-SIADA (M'07-SM'12) received the B.Sc. and M.Sc. degrees from Ain Shams University, Egypt, in 1998, and the Ph.D. degree from Curtin University, Australia, in 2004, all in electrical engineering, where he is currently an Associate Professor and the Discipline Lead of Electrical and Computer Engineering. His research interests include power electronics, power system stability, condition monitoring, and power quality. He is the Vice-Chair of the IEEE Computation Intelligence Society and the WA Chapter. He is the Editor-in-Chief of the International Journal of Electrical and Electronic Engineering and a regular Reviewer for various IEEE Transactions.

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“…So, one defect or fault may produce multiple signals according to different mechanisms. For example, PD activities are always accompanied by an electrical signal, ultrasonic signal, electromagnetic signal, and chemical signal emissions [10]- [13].…”

Section: Introductionmentioning

confidence: 99%

A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

Pang²,

Dong

et al. 2019

IEEE Access

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On-line condition monitoring and real-time fault detection are essential to protect power transformers from unscheduled outage of services. The core earth signals (CES) are valuable for fault detection and diagnosis of power transformers, as they are related to multiple transformer defects and faults, such as core multi-point earthing fault and core deep saturation. Moreover, the CES also contain valuable information of transient impulses intruded into power transformers such as very fast transient overvoltage (VFTO) impulses. This paper develops a novel power transformer condition monitoring system (NCMS), which makes full use of CES to detect and diagnose the external impulses and internal defects and faults. Firstly, the NCMS carries out the wide-band measurement of CES. Secondly, the NCMS obtains data from supervisory control and data acquisition system (SCADAS), dissolved gases analysis (DGA) system, and other monitoring systems, and correlates these data using grey relational analysis (GRA). Finally, the NCMS detects the impulses and diagnoses defects and faults based on the correlation relationships, then presents the monitoring results to the users. This novel system has been applied to the field and successfully diagnosed many defects and faults. It has high accuracy (< 3%) at the power and harmonic frequencies and possesses the capability to capture VFTO-pulses. INDEX TERMS Correlation analysis, core earth signal (CES), condition monitoring, industry applications, power transformer, wide-band measurement.

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A study on PD activities of oil-impregnated paper under pulse voltages using gas analysis

Cited by 10 publications

References 12 publications

Accumulative effect of partial discharges at impulse voltage wave tail

Accumulative effect of partial discharges at impulse voltage wave tail

Impact of Load Ramping on Power Transformer Dissolved Gas Analysis

A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

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