transformer oil filtration , relay testing and calibration of electrical equipments at rajamundry airport , filtration of transformer oil to attain acceptable di-electric strength by hot streamline process including arranging plant , transportation etc . complete as required . , testing of transformer oil sample including conducting bdv test & acidity test in reputed govt . approved labs and producing test report etc complete as required . , calibration of different types of relays on 11 kv ht panel viz . , control relays of buchholz alarm and trip , oil temperature increase , winding temperature increase , master relay/over current/earth fault relays , including submitting test report by oem service dealers/government approved agencies etc complete as required . , calibration & discrimination of different types of relays in the existing lt panel board viz . , idmt relay , master trip relay , reverse power relay , over current/earth fault relays including submitting test certificates by oem service dealers/ government approved agencies etc complete as required .