Insulation resistance testing of surge/lightning arresters

Electric power transmission and distribution systems are vital for modern life. And, since the electricity these systems provide is essential, then these systems are essential too. One of the less celebrated components of these systems is the humble surge arrester. These arresters serve the important job of keeping the electric supply smooth and steady. As such, these devices must be tested regularly as part of a maintenance program.

This application note looks at what a surge arrestor is, the test procedures of insulation resistance testers, as well as present test results and recommendations.