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keywords: Ofil Solar Blind product UV systems Thermograhpy IR Infrared Hot spots Electrical Current Degradation DayCor® corona

IR and UV - COMPLEMENTARY

Infrared and UltraViolet inspection technologies are being used to assess the condition of operating electrical components and installations. Infrared thermography detects temperature changes and is proportional to the square of the current drawn. UltraViolet UVigraphy, on the other hand, detects existing electrical discharges and is directly proportional to voltage. Both technologies are complementary, hence in the absence of current no heat develops, regardless of voltage. Yet, voltage is prerequisite for partial discharge, corona and arcing, regardless of current. Both UV and IR inspections are classified as NDT - Non Destructive Testing equipemnt, Remote Sensing Visual technologies. Together they cover a wider spectral range and provide enough information to get a clear view of the condition of electrical assets. As such, both technologies are required to perform comprehensive surveys.
Applicable in: transmission distribution, substations, switchgears, high & medium voltage rotating machines (motors, generators) and in commissioning of new installations.

  InfraRed UltraViolet
 

Detects ΔT - Hot Spots
Not Corona!

Detects Corona


 

Current Dependent
Heavy Line Loading is needed

Voltage dependent (e-field)
No line loading needed


 

Solar radiation and hot environment can mislead

All lighting & weather conditions


 

Detection occurs usually at progressive stage of degradation

Detection at Earlier of Degradation
(i.e. Commissioning)


No corona ring - IR />
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No corona ring - no hot spot
no corona ring
Detection at Earlier of Degradation
No corona ring - no hot spot
No corona ring - corona observed

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