This Winding Temperature Indicator is designed to measure the temperature of the winding by means of a special bulb surrounded by a heating resistance through which passes a current proportional to the current passing through the transformer winding subject to a given load and immersed in insulating oil at temperature oil. Its possible to adjust the heating system by means of a potentiometer whose knob is located on the winding temperature indicators dial. In this way the value of the winding temperature indicated by the instrument will be equal to the ones planned by the trafo manufacturer for a given transformer load.
The winding temperature indicators can be fitted with up to five change-over microswitches suitable to control cooling equipments and protection circuits (alarm and trip) of the transformer.
Measuring ranges : 0 / +150°C; 0 / +160°C
Capillary tube protection : Rilsan tubing / stainless steel armouring / steel + PVC armouring
Bulb : Bronze
Casing: Aluminium alloy powder painted (RAL 7035) suitable to withstand to any climate and to heavy polluted atmosphere in as well tropical or artic climates (-40 / +70°C)
Mechanical protection degree : IP 65
Working temperature : -40 / +70°C
Lens : Glass or polycarbonate
Locking ring : Nickel plated brass. Transparent coated
Measuring tolerance : 1,5% of full scale value
Commutation tolerance : 2% of full scale value
Commutation differential: 4% of full scale value
Insulation : 2000V 50Hz between terminals and earth for a 60 seconds time