Application of UHF sensors for PD measurement at power transformers

Siegel, Martin A.; Beltle, Michael; Tenbohlen, Stefan; Coenen, Sebastian

doi:10.1109/tdei.2016.005913

Cited by 104 publications

(73 citation statements)

References 4 publications

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“…E( f ): Electrical field strength at the antenna. As previous investigations [27] show, highest sensitivity for drain valve UHF sensors is achieved at a minimum insertion depth of d = 50 mm, which is used in this contribution (side note: The insertion depth d has to be the identical during both, the AF determination and the UHF measurement in the transformer). The known transfer function provided by the AF allows to incorporate the sensor into the calibration, which is transferring the point of calibration into the transformer.…”

Section: Calibration Methods For the Uhf Sensor (K 2 -Factor)mentioning

confidence: 99%

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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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Section: Calibration Methods For the Uhf Sensor (K 2 -Factor)mentioning

confidence: 99%

“…Antenna factor (AF) of UHF drain valve[27]. Red: UHF sensor installed into the cell (direct mount,Figure 5a).…”

mentioning

confidence: 99%

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers

Siegel¹,

Coenen

Beltle

et al. 2019

Energies

Self Cite

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“…This involves shutting off power supply for the device during connection/disconnection of probes which is a huge disadvantage [3]. Non-invasive methods include: acoustic emission [4,5], optical emission [6,7], electromagnetic or radio-frequency detection [8,9]. This paper concerns the use of invasive, classical method.…”

Section: Metrological Parameters Of the Measuring Systemmentioning

confidence: 99%

Comparative analysis of cellulose pressboard and aramid paper used in air insulation systems of high-voltage devices

Turba

Frącz

2017

E3S Web Conf.

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Abstract. The paper presents results of a comparative analysis of parameters of two kinds of solid dielectrics used in air insulation systems to prevent occurring partial discharges. The research works regarded materials made of: cellulose pressboard and aramid paper. All measurements were performed under laboratory conditions by changing the value of partial discharges generation voltage until breakdown occurred in the inhomogeneous environment that was simulated using needle-plate (made of copper) electrode system. The main contribution which resulted from studies is a statement that potential use of aramid paper as a dielectric can extend the life of a high voltage electric device as compared to standard cellulose pressboard usage due to higher electric resistances to breakdown or detection of corona voltage. Results shown that the aramid paper has greater electric resistance to breakdown in comparison to cellulose with no difference between both on detecting corona of partial discharge.

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“…At present, the detection methods of PD of a power transformer mainly include electric measurements, ultrasonic method, optical method, and the ultrahigh‐frequency (UHF) method . UHF method has the advantages of strong resistance to onsite electromagnetic (EM) interference and high sensitivity and has been widely applied for the online monitoring of PD of power transformers .…”

Section: Introductionmentioning

confidence: 99%

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

Zhang

Cheng

et al. 2019

IEEJ Transactions Elec Engng

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In locating a transformer partial discharge (PD) source, there is a large fluctuation error in the z -coordinate of the location, which results with planar layout ultrahigh-frequency (UHF) antenna sensors. For the large fluctuation error, this paper first theoretically analyzes the reason. According to the theoretical analysis results, a ladder-wise calculation method of the PD source z -coordinate is proposed: first, the x -and y-coordinates of the PD source are calculated, then the univariate equation f (z ) is derived, and the z -coordinate of the PD source is obtained by f (z ). Finally, the positioning effect of the ladder-wise calculation method for PD source z -coordinate is verified experimentally. Experimental results show that the proposed method can reduce the fluctuation of the z -coordinate of the PD source from 0.6 to 0.2, and when the PD location sample set is ≥10, the average absolute error of the z -coordinate is reduced from about 0.4 m to less than 0.1 m.

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Application of UHF sensors for PD measurement at power transformers

Cited by 104 publications

References 4 publications

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers

Comparative analysis of cellulose pressboard and aramid paper used in air insulation systems of high-voltage devices

Ladder‐Wise calculation method for z‐coordinate of transformer PD source based on planar layout UHF antenna sensors

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