Characterization of UHF PD sensors for power transformers using an oil-filled GTEM cell

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

doi:10.1109/tdei.2016.005562

Cited by 23 publications

(18 citation statements)

References 7 publications

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“…Figure 1 illustrates a schematic diagram of a steel tank of 1350 kVA transformer and positions of four UHF drain valve sensors [11,12] and a monopole antenna in the first experiment. Inside dimension of the transformer tank was 1720 mm in length, 760 mm in width and 1550 mm in height, respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The detailed dimension of the probe will be described later in Section 3.2. The antenna factor (AF), which indicates sensitivity of the sensor, was described in Reference [12]. The probes of the sensors (top portion of the sensors) were inserted 100 mm into the tank, which results in a high sensor sensitivity and is suitable for the comparisons with the simulated results.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Although various PD measurement techniques have been proposed and developed over a long period [5,6,7,8], the ultra-high frequency (UHF) method, that is, detecting electromagnetic (EM) waves in the UHF range (300 MHz–3 GHz) radiated due to a short rise time of the PD current pulse, has recently received much attention [9,10]. Attractive advantages are, for example, the robustness against external noise [11,12] and the capability of PD localization by using time-difference of arrival (TDOA) between multiple UHF sensors [13,14]. Due to these advantages, the UHF method is suitable for factory acceptance tests (FAT) and site acceptance tests (SAT), as well as on-line diagnoses [15].…”

Section: Introductionmentioning

confidence: 99%

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Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

Umemoto

Tenbohlen

2018

Sensors

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Diagnoses of power transformers by partial discharge (PD) measurement are effective to prevent dielectric failures of the apparatus. Ultra-high frequency (UHF) method has recently received attention due to its various advantages, such as the robustness against external noise and the capability of PD localization. However, electromagnetic (EM) waves radiated from PD tend to suffer attenuation before arriving at UHF sensors, because active part of the transformer disturbs the EM wave propagation. In some cases, that results in poor detection sensitivity. To understand propagation and attenuation characteristics of EM waves and to evaluate the detection sensitivity quantitatively, a computational approach to simulate the EM wave propagation is important. Although many previous researches have dealt with EM wave simulation for transformers, validations of those simulations by comparing with the experimental ones have seldom been reported. In this paper, cumulative energies, signal amplitudes and propagation times of EM waves were measured using a 630 kVA transformer. EM wave propagation was computed using the time-domain finite integration technique and the results were compared with the experimentally obtained ones. These simulation results showed good agreement with the experimental ones. The results can serve as guidelines to improve the efficiency of UHF PD detection and offer the possibility to achieve optimal placement of UHF sensors in power transformers.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

Umemoto

Tenbohlen

2018

Sensors

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“…In this contribution, two popular sensor designs, which are commercially available, are studied. Based on the installation mechanism, UHF sensors can be classified into two types: drain valve sensors and window-type sensors [ 15 ]. The former is directly inserted into the oil volume of the transformer tank using a DIN 50 or DIN 80 drain valve.…”

Section: Introductionmentioning

confidence: 99%

Study of the Influence of Winding and Sensor Design on Ultra-High Frequency Partial Discharge Signals in Power Transformers

Beura

Beltle

Tenbohlen

2020

Sensors

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Ultra-high frequency (UHF) partial discharge (PD) measurements in power transformers are becoming popular because of the advantages of the method. Therefore, it is necessary to improve the basic understanding of the propagation of signals inside the transformer tank and the factors that influence the sensitivity of the measurement. Since the winding represents a major obstacle to the propagation of the UHF signals, it is necessary to study the effect of winding design on signal propagation. Previous research activities have studied these effects using simplified models, and it is essential to consider the complexity of propagation in a complete transformer tank. Additionally, the quality of UHF PD measurements depends, to a large extent, on the sensitivity of the UHF sensors. In this contribution, a simulation model consisting of a simple, grounded enclosure with multiple winding designs is used to study the propagation characteristics of UHF signals when an artificial PD source is placed inside the winding. After analysis of the results, the winding designs are incorporated in an existing and validated simulation model of a 420 kV power transformer and analyzed to observe the influence in a more complex structure. Two commonly used sensor designs are also used in the simulation model to receive the signals. In all cases, the propagation and signal characteristics are analyzed and compared to determine the influence of the winding and sensor design on the UHF signals. It is found that the level of detail of winding design has a significant impact on the propagation characteristics. However, the attenuation characteristics of the UHF signals received by the two sensor designs are similar, with the electric field distribution around the sensor being the key difference.

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“…These are methods for detecting mostly PD that precede failures. The most effective methods include UHF [1][2][3], the acoustic emission method (EA) [4][5][6], ], the optical method [7][8][9][10]. Another result of the studies on electrical discharges is defining the power balance of the phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Detection of ionizing radiation generated by electrical discharges in the air using sphere-sphere system

Nagi

2017

E3S Web Conf.

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Abstract. The article presents the results of studies on the detection of ionizing radiation generated during electrical discharges. The obtained energy spectra for a system of sphere spark gaps, and the dependence of the obtained energies on the geometric arrangements of the detection devices and of the electrical discharge generating devices are presented. Additionally, the recorded signals from the scintillation detector, and the energy spectrum received for the examined system are also presented. It is significant that the field distribution related to the shape of the spark gaps is of key importance for the received measurement data. The completed studies for the sphere -shaped spark gaps are a part of studies on recording ionizing radiation generated by full and partial discharges in the air and in mineral oil.

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Characterization of UHF PD sensors for power transformers using an oil-filled GTEM cell

Cited by 23 publications

References 7 publications

Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

Study of the Influence of Winding and Sensor Design on Ultra-High Frequency Partial Discharge Signals in Power Transformers

Detection of ionizing radiation generated by electrical discharges in the air using sphere-sphere system

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