Penn Power using infrared and ultraviolet technology for inspections of transmission lines

helicopter and transmission line
Penn Power completes infrared and ultraviolet inspections of transmission lines. Credit: FirstEnergy

To keep power flowing for Penn Power and West Penn Power customers through the upcoming winter months, proactive aerial inspections were recently completed along nearly 1,000 miles of 345-kilovolt (kV) transmission lines in the greater Pittsburgh area using infrared and ultraviolet (IR/UV) technology, the utility said in a press release.

Penn Power and West Penn Power are subsidiaries of FirstEnergy.

Completed every four years, IR/UV patrols help prevent power outages by detecting early-stage and often invisible equipment issues within transmission substations and on high-voltage power lines that cannot be observed during regular visual inspections. These inspections complement annual aerial patrols that identify visible concerns, like overgrown trees, broken pole hardware or nesting birds on electrical equipment, said FirstEnergy.

An IR/UV inspection is performed at low-flying patrol speeds between 25 and 35 mph, using an infrared and ultraviolet camera mounted on the bottom of the helicopter. The onboard thermographer uses the camera to view the electrical equipment through infrared and ultraviolet spectrums to identify any sources of overheated components or voltage issues.

“Maintaining our transmission system is the first line of defense in preventing power outages,” said Scott Wyman, president of FirstEnergy’s Pennsylvania operations.


Resiliency is a major focus of DISTRIBUTECH International, set for Dallas, January 26-28, 2022.


The infrared technology shows heat on a color scale, with brighter colors or “hot spots” indicating areas that could need repairs. The thermal images can identify equipment issues such as loose connections, corrosion and load imbalances, while ultraviolet technology detects electrical discharge along a power line caused by issues like rusted hardware and cracked insulators. The combination of both technologies is beneficial because it provides a wider range of detection. Any issues identified during the inspections are addressed to prevent service disruptions and costly repairs down the road.

“Helicopters provide us with a view of our electrical equipment that we can’t get from the ground, allowing us to inspect miles of power lines in a single day,” said Wyman. “However, on-the-ground inspections are still necessary and underway to ensure our neighborhood power lines and equipment are ready to meet the high demand for electricity when customers crank up their heaters to stay comfortable this winter.”

Visual aerial inspections have also been completed along nearly 2,000 miles of 138-kV and 69-kV lines in 2021, with approximately 500 more miles of high-voltage lines to be inspected by the end of the year.

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Penn Power serves approximately 169,000 customers in in western Pennsylvania. West Penn Power serves approximately 734,000 customers in central and southwestern Pennsylvania.

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The Clarion Energy Content Team is made up of editors from various publications, including POWERGRID International, Power Engineering, Renewable Energy World, Hydro Review, Smart Energy International, and Power Engineering International. Contact the content lead for this publication at Jennifer.Runyon@ClarionEvents.com.

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