Insulators

Schmuck, Frank; Papailiou, Konstantin O.

doi:10.1007/978-3-319-31747-2_11

Cited by 1 publication

(2 citation statements)

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“…This paper deals with the use of a fully dielectric, electro-optic E-field sensor to diagnose internal defects in composite line insulators. Composite line insulators are, to date, a viable alternative to conventional insulators for transmission and distribution networks [ 1 ]. The interest in this type of insulators is due to their generally superior performance compared to glass or ceramic cap and pin insulators, especially in highly polluted environments as a result of their hydrophobicity [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been developed to detect internal and external defects for composite insulators in operation. UV detection by means of special cameras is particularly suited for localizing the initial corona activity, but it is not able to detect PDs occurring under the insulator surface [ 1 , 9 ]. Antennae have been used to detect electromagnetic waves radiated as a consequence of PDs [ 10 , 11 ], even though correlating the resulting wave spectrum to the kind of defect (and to whether it is internal or external) is not a simple task.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diagnostics of Internal Defects in Composite Overhead Insulators Using an Optic E-Field Sensor

Fasani,

Barbieri,

Villa

et al. 2024

Sensors

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Composite insulators for high-voltage overhead lines have better performances and are lighter than traditional designs, especially in heavily polluted areas. However, since it is a relatively recent technology, reliable methods to perform live-line diagnostics are still under development, especially with regard to internal defects, which provide few external symptoms. Thermal cameras can be employed, but their use is not always straightforward as the sun radiation can hide the thermal footprint of internal degenerative effects. In this work, an optical E-field sensor has been used to diagnose the internal defects of a set of composite insulators (bandwidth 200 mHz–50 MHz, min. detectable E-field 100 V/m). Moreover, a modelling activity using finite elements has been carried out to identify the possible nature of the defects by comparing experimental E-field profiles with those simulated assuming a specific defect geometry. The results show that the sensor can detect the presence of an internal defect, since its presence distorts the E-field profile when compared to the profile of a sound insulator. Moreover, the measured E-field profiles are compatible with the corresponding simulated ones when a conductive defect is considered. However, it was observed that a defect whose conductivity is not at least two orders of magnitude greater than the conductivity of the surroundings remains undetected.

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Section: Introductionmentioning

confidence: 99%