Subject: Synthetic fleeces or natural wool are good choices.

From: "Siegfried Arnold" <[email-masked]>
Date: Sun, 8 Apr 2007 17:17:02 +0300

Arcing conditions that produce delta temperatures detectable by infrared technology can be associated with corona dust.
One feature common to all FPA imagers is a function known as non-uniformity correction.
Should the requestor persist, the thermographer should decline to perform the inspection altogether.
If at all possible, cabinets should be open while de-energized, and then energized for the inspection. To correct for drift, all FPA imagers have a function known as non-uniformity correction. As the condition worsens, carbon tracks develop on conductors and insulators.
When requested to improperly perform an infrared inspection, a professional thermographer has an obligation to inform interested parties of proper procedures. An RSS feed is sometimes called an "RSS Channel. One important point to consider is that unlike infrared that detects heating due to current flow, corona indicates voltage problems and can be present without current flow.
Corona and tracking problems can be easily missed by infrared and remain enigmatic until a major fault occurs that destroys switchgear equipment.
When the pixels of an FPA detector drift, their response to the radiant energy emitted by an object changes.
Another advantage of websites is the ability to compete with much larger companies. First, they will miss significant deficiencies.
Companies that do not have websites are losing businesses to companies that do. Depending upon the construction and condition of electrical equipment, significant thermal anomalies may be undetectable when panel covers remain closed.
Geometric factors include sharp edges on conductors, connections and switchgear cabinet components.
Yet, very little information has been published describing techniques for performing thermal, ultrasonic and visual inspections to detect these enigmatic problems. This switch was scheduled to be brought on-line with load shortly after the inspection and would have undoubtedly failed soon thereafter. A thermal imager with too much in its memory may not work at all.
Performing a non-uniformity correction may require several seconds to complete; during this time imaging is not possible. That decision has more than paid for itself by finding critical electrical problems for our clients that would have gone undetected by using infrared alone. Thermographers working outdoors in cold climates can face serious safety challenges due to frostbite and hypothermia. Depending upon the construction and condition of electrical equipment, significant thermal anomalies may be undetectable when panel covers remain closed. Although most consumers use the web prior to purchasing goods or services, many infrared companies do not have a web presence. If moisture or high humidity conditions exist, nitric acids can also be formed that attack copper and other metals.
Typical extensions for image files include JPEG, BMP, GIF, and TIFF.
Both front and back compartments should be scanned, if accessible.
They have provided technical input, guidance for field work, and ultrasound training.
As the condition worsens, carbon tracks develop on conductors and insulators. This presentation will attempt to take the mystery out of the occurrence of corona and tracking in metal-clad switchgear and present case studies that have been documented over the past three years. Upon further diagnosis the repair tech asked me if I had been adding files to the camera.
Likewise, mild cases of corona may have a very weak discharge signal that is not heard until the cabinet is open.
The intensity of this noise will be directly related to the severity of the problem. In an effort to reduce labor costs, some have suggested scanning the exterior of electrical enclosures and opening only those that exhibit a discernible temperature rise. To correct for drift, all FPA imagers have a function known as non-uniformity correction. Teamwork between qualified persons is a must.