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Testing & Maintenance


Thermography 101

Thermography used to be expensive, difficult, and primarily used by large industrial facilities and the military. These days, it has become much more affordable, easier to use, and more broadly applied. A thermal imager works by producing thermal (heat) pictures of the equipment. Electrical...

Vacuum Interrupter Testing

Predicting remainder of field life finally becomes easier BY FINLEY LEDBETTER, Group CBS Vacuum interrupters (VIs) have widely replaced older air-magnetic and oil interrupters for circuit breakers rated at one kilovolt (kV) or higher. These devices offer up to 10 times the expected lifetime than...

Wireless Measurement Systems

Conquering challenges with wireless measurement systems BY COLIN PLASTOW, Fluke Electronics Any type of manufacturing or industrial environment presents a number of challenges when taking measurements. Whether you need to check performance over time or run spot checks, there are many situations...

A Closer Look into the True Cost of Replacing Electrical Switchgear

During my switchgear modernization presentations all over the US, I am constantly reminded of the concerns customers face with their aging electrical infrastructure. For the most part, these center around safety, reliability and productivity: Replacements parts are very hard (or impossible) to be...


Safe Electrical Maintenance Checklist

Reduce the risk of arc flash hazards with CSA Z462 BY ROBERT BURGESS, Lineman’s Testing Laboratories Safe electrical maintenance practices and on-going personnel training can minimize the likelihood of electrical injuries and fatalities due to electrical shock, electrocution, arc flash and arc...

Testing

Understanding the DC Overpotential Test

The 411 on DC testing of low-voltage circuit breakers

BY JIM WHITE, Shermco Industries, Inc.

The direct current (DC) overpotential test is one of the basic tests conducted to ensure an insulation system has adequate insulation life to make it to the next scheduled maintenance interval. While not a difficult test to perform, the test equipment used could have some serious deficiencies that may not be discovered unless the technician knows how to verify test...

Testing Articles