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Protection Relay Testing. Due to the key role protection systems play within today's smart power systems, their reliable operation has to be ensured at all times. Therefore, protective relays as well as recloser controls must be tested throughout their life cycle, from their initial development through production and commissioning to periodical maintenance during operation. Protection relay tester which offers all the characteristics and functions needed for protective relay testing, in a manual or automatic mode, designed for maximum efficiency, flexibility and simplicity, with the required accuracy and performance to test any kind and type of relays in all situations. Application for substation commission & relay factory checker etc. GFUVE GROUP protection relay tester have six phase protection relay tester with 6U6I, three phase protection relay test equipment, single phase relay test set and phase angle meter etc.