Infrared Thermography or thermal imaging is the technique that uses an infrared imaging and measurement camera to “see” and “measure” invisible infrared energy being emitted from an object. The objective of a thermographic survey is to identify abnormally high temperatures within electrical distribution systems.

Infrared Thermal imaging is an extremely useful tool for electrical fault finding. It requires no contact being made with the components which means that the components can be checked in a live state, there is no effect on the components or interruption in any processes the electrical system may be controlling.

Thermography ensures safety related to humans, the safety of equipment and workplace. The Delta T (temperature difference) criteria to evaluate the temperature severity of an exception. The Delta T recommended actions are mentioned below:

consultivo thermography deltaT

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Thermographic survey – Approach & Methodology

  • Pre-Audit Meeting (opening meeting) with management and all concerned departments, identification of the target electrical equipment, installations and systems to define the scope of the audit such as Incoming supply receiving section, main sub-station, electrical equipment installed in various process sections, cabling, earthing system
  • On-site thermography on the selected spots and equipment to identify hazards as per the scope of the audit
  • Discussion with Safety and Electrical personnel and sharing information of hotspot observed during thermography.
  • Submission of draft Thermography report to the client containing findings and observations with thermal imaging
  • Receiving inputs from the client on the draft Thermography report
  • Submission of final Thermography report

Standards Used

  • NFPA – 70B
  • National Electrical and Testing Association (NETA)

Thermographer Competence & Qualifications

An electrical engineer and certified ITC (Infrared Training Center) ‘Thermographer’

Instruments used

Thermal Imaging Camera, Make FLIR, Model E60

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consultivo thermography at a glance infographic

Did you know?

Electrical faults can lead to breakdowns and the potential for fire hazards. In both cases, the losses due to downtime and repair costs can become costly. Electrical equipment can suffer from numerous faults which will show an increase in temperature. Few of the causes could be:

  • Corroded or loose connections
  • Imbalanced Loads
  • Using underrated equipment or overloading equipment
  • Insulation Damage, Incorrect voltage
  • Blocked or poorly ventilated equipment
  • Deterioration due to age
  • Exceeding the recommended temperature rating

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