Power transformer monitoring using UHF sensors: installation and testing

Judd, M.D.; Farish, O.; Pearson, J.S.; Breckenridge, T.; Pryor, B.M.

doi:10.1109/elinsl.2000.845528

Cited by 41 publications

(9 citation statements)

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“…Rutgers from the Netherland KEMA Laboratory and Judd from the University of Strathclyde found that the rising edge of oil-immersed transformer partial discharge signals is steep, and the pulse width is in nanoseconds (more than 1 GHz UHF signals can be stimulated) [3][4][5]. Thus, the ultrahighfrequency (UHF) method was established and is currently used widely because of its strong anti-interference ability, high positioning accuracy, and other advantages [6].…”

Section: Introductionmentioning

confidence: 99%

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Zhang

Xiao

2017

International Journal of Antennas and Propagation

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In recent years, extensive research has been conducted on the ultrahigh-frequency (UHF) method. Considering that acquiring a partial discharge UHF signal is the first step in a series of tasks, such as fault diagnosis and defect location, the UHF sensor plays an important role in the UHF method. An antipodal Vivaldi antenna installed at a transformer's joint is designed in this study according to the structural features of 750 kV transformers in China. Several effective structures, such as linear gradient microstrip and slot edge, are employed to improve the return loss and radiation characteristics. A metal box is designed after analyzing the influence of the metal around the antenna. The metal box can effectively shield against electromagnetic interference and does not deteriorate the performance of the antenna significantly. Experimental data show that this antenna is much more sensitive than the rectangular plane spiral antenna. The proposed antipodal Vivaldi antenna is suitable for detecting partial discharge in large transformers.

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Section: Introductionmentioning

confidence: 99%

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Zhang

Xiao

2017

International Journal of Antennas and Propagation

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“…The test arrangement includes a high voltage source, a test electrode and a UHF sensor. The UHF plate sensors were used where the active coupler face contains a broadband sensing element with a diameter of 175 mm [20]. The sensitivity plot of the UHF sensor across its frequency range of 200 MHz to 2 GHz is shown in Figure 4 [21].…”

Section: Experimental Studiesmentioning

confidence: 99%

Impact of adding activated bentonite to thermally aged ester‐based TiO₂nanofluids on insulation performance

Amalanathan

Harid

Griffiths

et al. 2021

IET Nanodielectrics

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The authors report the key findings from an experimental study that explored the use of activated bentonite for the reclamation of thermally aged ester‐based transformer nanofluids to improve their insulation performance. Bentonite activated with acid treatment caused an increase in the specific surface area and pore volume of bentonite compared to the bentonite sample before treatment, thus imparting an improved adsorption capability. Physico‐chemical diagnostic studies were carried out to characterise the activated bentonite. The insulation performance of the reclaimed natural ester and nano‐filled ester fluid samples was assessed by measuring the corona inception voltage and breakdown voltage of each fluid sample, apart form measuring the flow electrification current using the spinning disk method. The results revealed that the reclamation process improved the corona inception voltage, dissipation factor and the breakdown voltage of the base ester fluid sample due to attraction of carbon particles to activated bentonite, but no significant variation was observed with nanofluids due to the depletion of the electrical double layer. The flow electrification current of ester and ester nanofluids reduced after treatment with activated bentonite, may be attributed to the interaction between copper and bentonite that alters the double layer formation responsible for the separation of charges.

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“…The transformation itself is given by (2) where refers to the color in the shown plots. The initial value has to be selected to obtain the most detailed graph.…”

Section: Signal Acquisition Processing and Interpretationmentioning

confidence: 99%

Sensitive Online PD-Measurements of Onsite Oil/Paper-Insulated Devices by Means of Optimized Acoustic Emission Techniques (AET)

Grossmann

Feser²

2005

IEEE Trans. Power Delivery

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Recently developed monitoring-systems show the need as also the possibilities for online-and offline-onsite-diagnostics. The limit in sensitivity for electrical pd-measurements according to IEC 60270 which is reached using filters for sinusoidal disturbances and compensation for corona impulses is still not satisfactory. The acoustic partial discharge measurement (pd-measurement) is also a well known and reliable method often used by transformer manufacturers in testing. In laboratory setups a gain in sensitivity of the acoustic in comparison to the electrical pd measurements could be established. This is reached by adapting the sensors to the propagation path, a modern but moderately priced acquisition hardware and the introduction of new signal processing algorithms. The developed sophisticated measuring systems show remarkable results in online acoustic pd-measurements onsite.

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Power transformer monitoring using UHF sensors: installation and testing

Cited by 41 publications

References 1 publication

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Impact of adding activated bentonite to thermally aged ester‐based TiO₂nanofluids on insulation performance

Sensitive Online PD-Measurements of Onsite Oil/Paper-Insulated Devices by Means of Optimized Acoustic Emission Techniques (AET)

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Power transformer monitoring using UHF sensors: installation and testing

Cited by 41 publications

References 1 publication

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Antipodal Vivaldi Antenna to Detect UHF Signals That Leaked Out of the Joint of a Transformer

Impact of adding activated bentonite to thermally aged ester‐based TiO2nanofluids on insulation performance

Sensitive Online PD-Measurements of Onsite Oil/Paper-Insulated Devices by Means of Optimized Acoustic Emission Techniques (AET)

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Product

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About

Impact of adding activated bentonite to thermally aged ester‐based TiO₂nanofluids on insulation performance