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

Damiano Fasani¹, Luca Barbieri¹, Andrea Villa¹

¹RSE SpA-Ricerca sul Sistema Energetico, Via Raffaele Rubattino, 54, 20134 Milano, Italy.

Sensors (Basel, Switzerland)

|March 13, 2024

Summary

An optical E-field sensor effectively detects internal defects in composite insulators for high-voltage lines. The sensor identifies defects by analyzing electric field distortions, crucial for maintaining power line integrity.

Keywords:

composite insulator electro-optic sensor live-line diagnostics

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Area of Science:

Electrical Engineering
Materials Science
Power Systems

Background:

Composite insulators offer advantages over traditional designs for high-voltage overhead lines, particularly in polluted environments.
Live-line diagnostics for composite insulators are still developing, especially for internal defects with subtle external signs.
Thermal imaging for defect detection can be hindered by solar radiation interference.

Purpose of the Study:

To investigate the use of an optical E-field sensor for diagnosing internal defects in composite insulators.
To develop a method for identifying the nature of internal defects through E-field profile analysis.
To establish the sensitivity threshold of the optical E-field sensor for defect detection.

Main Methods:

Utilized an optical E-field sensor (200 mHz-50 MHz bandwidth, 100 V/m min. detectable E-field) for live-line diagnostics.
Performed finite element modeling to simulate E-field profiles with various defect geometries.
Compared experimental E-field measurements with simulated profiles to identify defect characteristics.

Main Results:

The optical E-field sensor successfully detected the presence of internal defects by observing distortions in the E-field profile compared to sound insulators.
Experimental E-field profiles correlated well with simulated profiles when assuming a conductive internal defect.
Defects with conductivity less than two orders of magnitude higher than the surrounding material were not detected.

Conclusions:

Optical E-field sensing is a viable method for detecting internal defects in composite insulators.
The conductivity of internal defects significantly influences their detectability.
Further research may be needed to enhance the detection of low-conductivity defects.