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 |