Research on the Interrelation between Temperature Distribution and Dry Band on Wet Contaminated Insulators

Zhang, Da; Meng, Fancui

doi:10.3390/en12224289

Cited by 7 publications

(4 citation statements)

References 13 publications

(12 reference statements)

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“…This conclusion appears to be justified by the results in Figure 11, in which the maximum average temperature reached at the middle of the dry band was highest for Plexiglas (99 • C), followed by RTV (82 • C) and glass (34 • C). The value obtained for the glass substrate seems to be in accordance with experimental measurements performed on a real wet contaminated ceramic insulator [42]. These observations suggested that the higher thermal conductivity of the glass substrate decreased the temperature at the surface of the pollution layer by allowing for better thermal conduction through the sample thickness.…”

Section: Influence Of Parameters On Dry Band Formationsupporting

confidence: 87%

Experimental Investigation of Parameters Influencing the Formation of Dry Bands and Related Electric Field

Andoh,

Volat

2024

Energies

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This paper presents an experimental investigation conducted to determine the influence of parameters such as the ambient temperature, pollution level, and substrate material on the formation of dry bands on polluted layers. To investigate these parameters, we applied a simplified insulator geometry, developed in our previous work, to experimentally control the complex process of dry band formation on a polluted surface. The simple geometry of the experimental model enabled the use of Plexiglas, RTV, and glass as construction substrate materials. RTV and glass were used to simulate a composite and ceramic insulator surface, respectively. Moreover, an electrooptic (EO) probe enabled the measurement of the axial E-field evolution at the surface of the dry band during dry band formation. The results indicated that the substrate material, ambient temperature, and pollution level substantially influence dry band formation. The effects of the first two parameters are directly associated with heat transfer phenomena in the substrate material and at the ambient air/substrate interface. The effect of the third parameter is associated with absorption and evaporation of the pollution layer. In addition, the appearance of the dry band can be clearly identified by a rapid increase in both the pollution layer resistance and the axial E-field in the dry band area. The value of the axial E-field is influenced primarily by the width of the dry band and by the pollution layer resistance, which is directly dependent on the humidification duration. Finally, because most of the results obtained herein were in accordance with those in the literature, we conclude that the proposed experimental model may provide an effective and inexpensive testing method for developing new materials and solutions for improving the dielectric performance of insulators used in polluted environments. Similarly, the simple geometry of the experimental model and the ability to easily control the experimental parameters may enable this tool to validate the results of various numerical models in studies of the thermoelectrical behavior of polluted insulators.

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Section: Influence Of Parameters On Dry Band Formationsupporting

confidence: 87%

Experimental Investigation of Parameters Influencing the Formation of Dry Bands and Related Electric Field

Andoh,

Volat

2024

Energies

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“…The results showed that the float potential metal has a strong distortion effect on the current density, and it is easy to form a dry band through the contaminated layer, which triggers the arc discharge. Several scholars have carried out experimental and simulation studies on the dry band discharge on the insulator surface [14][15][16][17]. However, there are connections between the composite rod and metal/composite plate in the tower, which may also lead to electric field distortion.…”

Section: Introductionmentioning

confidence: 99%

Suppression Measures of Partial Discharge at Rod–Plate Connection in Composite Tower

Hao¹,

Huang²,

Fang³

et al. 2023

Energies

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Rods and plates at the connections in composite insulating material towers are commonly fixed to each other by metal bolts, which may cause electrical field distortion at the connections. So, the rod–plate connections are prone to partial discharge under polluted and wet conditions, and the resulting electric field and temperature changes can affect the mechanical and electrical performance of the whole tower. In this paper, an artificial pollution test synchronous observation platform with an infrared and visible light imager, leakage current, and voltage measurement was built to observe the dry band formation and partial discharge at the simplified rod–plate connections in the composite towers. Then, the electric field simulation of the rod–plate connection specimen showed the current density distribution. When combining the test and the simulation, it was concluded that the cause of the partial discharge was the distortion of the current density and, thus, measures to suppress the partial discharge at the rod–plate connections were proposed. Finally, it was verified that the measures can improve the current density distortion phenomenon, delay dry band formation, and effectively suppress the partial discharge at the rod–plate connections under the same test conditions.

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“…The main sensing elements are the instrument transformers (ITs), which measure voltages and currents, scaling them to suitable values for the acquisition systems. Of course, environmental quantities can be measured as well (such as in [4][5][6][7] for cables, and in [8][9][10] for insulators, etc.) but out of the scope of this paper.…”

Section: Introductionmentioning

confidence: 99%

On the Importance of Characterizing Virtual PMUs for Hardware-in-the-Loop and Digital Twin Applications

Mingotti

Costa

Cavaliere

et al. 2021

Sensors

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In recent years, the introduction of real-time simulators (RTS) has changed the way of researching the power network. In particular, researchers and system operators (SOs) are now capable of simulating the complete network and of making it interact with the real world thanks to the hardware-in-the-loop (HIL) and digital twin (DT) concepts. Such tools create infinite scenarios in which the network can be tested and virtually monitored to, for example, predict and avoid faults or energy shortages. Furthermore, the real-time monitoring of the network allows estimating the status of the electrical assets and consequently undertake their predictive maintenance. The success of the HIL and DT application relies on the fact that the simulated network elements (cables, generation, accessories, converters, etc.) are correctly modeled and characterized. This is particularly true if the RTS acquisition capabilities are used to enable the HIL and the DT. To this purpose, this work aims at emphasizing the role of a preliminary characterization of the virtual elements inside the RTS system, experimentally verifying how the overall performance is significantly affected by them. To this purpose, a virtual phasor measurement unit (PMU) is tested and characterized to understand its uncertainty contribution. To achieve that, firstly, the characterization of a virtual PMU calibrator is described. Afterward, the virtual PMU calibration is performed, and the results clearly highlight its key role in the overall uncertainty. It is then possible to conclude that the characterization of the virtual elements, or models, inside RTS systems (omitted most of the time) is fundamental to avoid wrong results. The same concepts can be extended to all those fields that exploit HIL and DT capabilities.

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Research on the Interrelation between Temperature Distribution and Dry Band on Wet Contaminated Insulators

Cited by 7 publications

References 13 publications

Experimental Investigation of Parameters Influencing the Formation of Dry Bands and Related Electric Field

Experimental Investigation of Parameters Influencing the Formation of Dry Bands and Related Electric Field

Suppression Measures of Partial Discharge at Rod–Plate Connection in Composite Tower

On the Importance of Characterizing Virtual PMUs for Hardware-in-the-Loop and Digital Twin Applications

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