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Comparing UV & IR Diagnostic Inspection of Lines & Substations

June 9, 2018 • ARTICLE ARCHIVE, Corona, Inspection, IR, Maintenance, UV
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One of the issues in maintenance of overhead lines and substations relates to better understanding what is being revealed during ultraviolet or infrared inspections of equipment and hardware. Do these two technologies highlight the same problem or are they complementary, each revealing a different aspect of that problem? Moreover, is it correct to assume that each different type of potential defect carries some unique ‘signature’ and therefore requires its own specific inspection technology? This 2014 INMR article, contributed by Roel Stolper, an expert researcher in diagnostics with CSIR in South Africa, addressed these questions.


Typical Problems on Lines

Electric utilities and research organizations worldwide have launched programs to investigate and classify all the typical faults that occur on overhead lines. A past Working Group within CIGRE, for example, has been dedicated to better understanding the behaviour of polymeric insulators under different environmental conditions

An ultraviolet and infrared recoding of the same phenomena show presence of corona but with no heat dissipation inspection line Comparing UV & IR Diagnostic Inspection of Lines & Substations An ultraviolet and infrared recoding of the same phenomena show presence of corona but with no heat dissipation

Fig. 1: An ultraviolet and infrared recoding of the same phenomena show presence of corona but with no heat dissipation
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Infrared recording of capacitor bank.Bus bar clamp with corona discharges. inspection line Comparing UV & IR Diagnostic Inspection of Lines & Substations Infrared recording of capacitor bank

(Left) Fig. 2: Infrared recording of capacitor bank. (Right) Fig. 3: Bus bar clamp with corona discharges.
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Corona recording.Infrared recording of same object. inspection line Comparing UV & IR Diagnostic Inspection of Lines & Substations Corona recording

(Left) Fig. 4a: Corona recording. (Right) Fig. 4b: Infrared recording of same object.
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Acoustic inspection (Photo: Courtesy ndb Technologie).Ultraviolet corona camera inspection. inspection line Comparing UV & IR Diagnostic Inspection of Lines & Substations Acoustic inspection

(Left) Fig. 5: Acoustic inspection (Photo: Courtesy ndb Technologie).(Right) Fig. 6: Ultraviolet corona camera inspection.
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Infrared camera inspection (Photo: Courtesy FLIR). Combined ultraviolet, infrared and visible camera inspection. inspection line Comparing UV & IR Diagnostic Inspection of Lines & Substations Infrared camera inspection

(Left) Fig. 7: Infrared camera inspection (Photo: Courtesy FLIR).(Right) Fig. 8: Combined ultraviolet, infrared and visible camera inspection.
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Overview of Different Line Components as well as Potential Associated Problems & Required Spectrum of Detection inspection line Comparing UV & IR Diagnostic Inspection of Lines & Substations Different Line Components

* Based on interviews with system operators across South Africa.
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