Low Voltage Instrument Transformers
TWB SA manufactures all types of low voltage instrument transformers, current and voltage, 0.75kV and 1 kV, for indoor as well as for outdoor applications, according to IEC 61869-1. They are window, wound or split core type. They are either encapsulated by a high grade flame self-extinguishing polycarbonate housing or resin impregnated.
Apart from these types, we are able to manufacture any other special types upon request.
|Rated insulation level||0,72 kV and 1 kV|
|Frequency||50 / 60 Hz|
|Rated primary current||up to 2500 A|
|Rated secondary current||1 A or 5 A|
|Accuracy class||0,1 up to 3 for measuring and 5P or 10P for protection|
|Rated thermal current||Ith = 60 x IN|
|Dynamic current||Idyn = 2,5 x Ith|