The third and last preventive off line test level, is performed while your asset if not energized, is off line. This test level will be required for the whole overall tests available for a specific asset. Usually, will be done when you receive suspicious results of the second test level, the Predicitive On Line level.
The Preventive off line level, will also be required for evaluating the insulation age and to assess life residual of your HV asset. To perform the whole 3 level test set on an HV asset : Basic – Predictive On Line and Preventive Off line is a valuable tool to plan your financial multi -year investment and translate the Hv equipment status for your risk management seniors of the whole power station.