Instrument transformer GSW series

encapsulatedlow-voltagetoroidal

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. Highest voltage for equipment (kV) 072 Rated insulation level (kV) 0.72/3/- Rated primary current (A) 1 up to 30 50 up to 6000 Primary reconnection (A) upon request - Rated secondary current IA| 5 or 1 Secondary tap upon request Overcurrent factor 1,2 Rated burden of measuring core (VA) 5 up to 30 Acoracy class of measunng core 02:05:1:3 Instrument security factor 5or 10 Rated burden of protection core (VA) 1.25 up to 30 Accuracy class of protection core 5P:10P Accuracy limit factor 5 or 10 or 15 or 20 Summation available upon request - Number of cores up to 2 up to 2 Rated frequency (Hz) 50:60 Rated thermal short-time current (kA) Ith = 60 x In Rated dynamic current (kA) Idyn = 2.5 x Ith Class of insulation E Maximum altitude of installation (m) up to 1000 Ambient temperature (*C1 - 5 up to + 50 Specifications IEC 61869-1 A 2 Drawing Nr (indicatively) 1601/12-1602/12 1603/12- 1604/12