Insulation contamination of overhead transmission lines by extreme service conditions

Zabrodina, Irina K.; Shlapak, Vladislav S.

doi:10.1109/tdei.2015.005323

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…(i) There are large differences in the composition of soluble salts for different typical sources. For example, the content of CaSO 4 in coastal areas is relatively low while the content of CaSO 4 in inland industrial areas is relatively high, which is consistent with the results of previous studies [22,26,27]. (ii) The composition of the soluble salts on the insulator surface in the same category of pollution sources in different areas can be similar or vary greatly.…”

Section: Tests At Different Areas (Near the Typical Pollution Sources)supporting

confidence: 90%

“…Comparing the differences of soluble salt ions in the contamination deposited on the insulator surface near six typical pollution sources mentioned above, as shown in Table 3, it can be found that: (i) There are large differences in the composition of soluble salts for different typical sources. For example, the content of CaSO 4 in coastal areas is relatively low while the content of CaSO 4 in inland industrial areas is relatively high, which is consistent with the results of previous studies [22, 26, 27 ]. (ii) The composition of the soluble salts on the insulator surface in the same category of pollution sources in different areas can be similar or vary greatly. For example, the proportion of CaSO 4 in the contamination of insulators near cement plant #5 is >92%, while the proportion of CaSO 4 in the surface contamination of naturally contaminated insulators around cement plant #5 is <74%.…”

Section: Contamination Components Of Actual Operating Insulatorssupporting

confidence: 90%

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Temporal and spatial characteristics of soluble salt components accreted on the insulator surface

Cao

Chen

Yin

et al. 2020

IET sci. meas. technol.

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Due to the differences in typical pollution sources, the soluble salt composition deposited on the naturally contaminated insulators varies with the region. As different soluble salts have different effects on the pollution flashover voltage of insulators, it is necessary to investigate the spatial and temporal distribution of the soluble salt composition deposited on the insulator surface to make the external insulation design more scientifically and reasonably. In this study, an artificial contamination test platform was built to collect the contamination naturally deposited on the specimens. The test results showed that the contamination composition deposited on the specimen was similar to that in the atmosphere, and the inclination angle of the specimen and the duration of pollution deposition had little influence on the contamination composition. After examining the industrial post insulators from actual substations, it was found that the contamination composition was almost the same for different insulator surface materials, insulator shed types, and voltage polarities. It was also found that the deposited contamination was mostly influenced by pollution sources. The results can provide a reference for the studies of pollution distribution of natural insulators.

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Section: Tests At Different Areas (Near the Typical Pollution Sources)supporting

confidence: 90%

Section: Contamination Components Of Actual Operating Insulatorssupporting

confidence: 90%

Temporal and spatial characteristics of soluble salt components accreted on the insulator surface

Cao

Chen

Yin

et al. 2020

IET sci. meas. technol.

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“…Composite insulators (hereinafter referred to as "insulators"), which are commonly used in power systems, are crucial insulation devices with a typical aerodynamic structure [1]. If conductive particles settle on the surface of an insulator, its dielectric properties would be affected, potentially resulting in the formation of a continuous conductive layer on the surface, which may cause a contamination flashover accident, particularly in humid weather, leading to significant financial losses [2,3]. Optimizing the aerodynamic structure of insulators can help reduce the amount of surface contaminant deposition, which is essential for ensuring the safe operation of transmission lines.…”

Section: Introductionmentioning

confidence: 99%

Simulation study on the structural optimization of composite insulators based on contaminant deposition

2024

Archives of Electrical Engineering

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Optimizing the aerodynamic structure of composite insulators can guarantee the safe operation of power systems. In this study, we construct a simulation model for composite insulator contaminant deposition using the COMSOL simulation software, and the rationality of the simulation model and method is verified through wind tunnel experiments. Taking the FXBW4-110/100 composite insulator as an example, we adopt a progressive optimization plan to explore the impacts of shed spacing 𝑠, and shed inclination angles 𝛼 and 𝛽 on its contaminant deposition characteristics under DC and AC voltages. Based on the numerical simulation results, we analyze the antifouling performance of insulators before and after structural optimization. The results indicate the following: 1) The contaminant deposition of the insulator under AC and DC voltages is negatively correlated with the shed spacing 𝑠, but positively correlated with the lower inclination angle 𝛽. 2) Under AC voltages, the contaminant deposition of the insulator increases with the upper inclination angle 𝛼, while under DC voltages, the contaminant deposition shows an uptrend first, then a downtrend and then an uptrend again with the increase of the upper inclination angle 𝛼.3) Compared with the original model, the AC-optimized model (𝛼 = 6 • , 𝛽 = 2 • and 𝑠 = 98 mm) with a larger shed spacing 𝑠, and smaller shed inclination angles 𝛼 and 𝛽 showed superior antifouling performance at wind speeds of no less than 2 m/s, and under the typical conditions (𝑣 = 2.5 m/s, 𝑑 = 20 μm, and 𝜌 = 2 200 kg/m 3 ), its contaminant deposition is 15% less than that of the original model (𝛼 = 10 • , 𝛽 = 2 • and 𝑠 = 80 mm).

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“…In three-phase systems, a fault may involve one or more phases and ground, or may occur only between phasesIn a "ground fault" or "earth fault", current flows into the earth. [1] The prospective short-circuit current of a predictable fault can be calculated for most situations. In power systems, protective devices can detect fault conditions and operate circuit breakers and other devices to limit the loss of service due to a failure.…”

Section: Introductionmentioning

confidence: 99%

A Novel Protection Method for Unsymmetrical Fault Detection of Overhead Transmission Line by Using DWT

Nandhini¹,

Srinivasan²

2017

BIJMMI

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Insulation contamination of overhead transmission lines by extreme service conditions

Cited by 14 publications

References 10 publications

Temporal and spatial characteristics of soluble salt components accreted on the insulator surface

Temporal and spatial characteristics of soluble salt components accreted on the insulator surface

Simulation study on the structural optimization of composite insulators based on contaminant deposition

A Novel Protection Method for Unsymmetrical Fault Detection of Overhead Transmission Line by Using DWT

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