According to survey of hydro generator failure conducted by International Council on Large Electric (Cigre) working group from 5 different countries showed that insulation damages are most frequent failures (57%). Dielectric strength of an electrical apparatus should be tested when received from manufacturers to ensure conformity with the manufacturer specification. Thereafter, maintenance tests help track health and identify potential failures.
This paper introduces a new concept developed for high voltage test in electrical apparatus used in railway system which supports predictive maintenance. This device conducts insulation test between contacts and ground, whereby contacts must withstand the test voltage for a specified time also test several apparatuses at the same time thus improving efficiency in the maintenance sector.
The device is connected to a 220 voltage power source and using automatic voltage regulator high voltage of up to 3kV is achieved. The actuality of this study to confirm the correct functioning of the apparatus and enable data collection for the dielectric strength status of the apparatus, whereby the collected data will aid in scheduling diagnostic and repair work thus reducing downtime from unexpected failures. Increase safety and efficiency of the machines by eliminating voltage leakages & the need to conduct qualitative tests for a number of machines in the shortest time possible.

HiPot, Dielectric strength, failure detection, Railway maintenance