When performing a insulation resistance test at 2500vdc on a piece of equipment the black lead is placed on ground or earth and the red is placed on the live part that you are measuring. A question was asked does it really matter if the leads are reversed and the ground lead is on the live part...
Waross,
That’s exactly what we want to prevent. I want to know what the industry thinks is a safe percentage of H2 gas in the head space before testing. Also we fill the head space with N2 to 8-10lbs through the 1/4”pipe fill valve and regulator and then vent through the same pipe and test for H2.
When we have a distribution transformer clear the system due to fault indications on the transformer, we test the cover gas head space before we perform any testing on the transformer. The gas tester tests for hydrogen and level is given out in percent LEL. What is your process for purging the...
