Instrument transformer AFK series

currentcast resinfor outdoor service

Our manufacturing program also includes supporting type current transformers for outdoor installation. The resin is cycloaliphatic and outdoor proof. Because it is vacuum impregnated and cured under a long thermally controlled cycle, an insulating material of high electrical and mechanical qualities, resistance to ultraviolet rays and the effects of tracking, erosion and ageing, is thus obtained. For an increase in the creep age distance, the insulation body is equipped with double sheds, the shape of which has been determined aftermany years of research. They contain up to five cores for revenue metering and protection purposes, constructed from high quality siliceousor nickel steel laminations. In case 1:2 reconnection is requested, thiscan be achieved either by mounting reconnection bars to the primary terminals, or by an intermediate terminal at the secondary coil. Highest voltage for equipmet (kV) 12 24 36 Rated insulation level (kV) 12/28/75 24/50/125 36/70/170 Rated primary current (A) 5 up to 1200 Rated secondary current (A) 5 or 1 Accuracy class of measuring core 0.1 ; 0.2S : 0.2 : 0.5S; 0.5: 1 : 3 Instrument security factor 5or 10 Rated burden of measuring core (VA) 1.25 up to 30 Accuracy class of protection core 5P;10P Accuracy limit factor 5or 10 or 15 or 20 Rated burden of protection core (VA) 1.25 up to 30 Number of cores 1 Rated frequency (Hz) 162/3:50:60 Rated thermal short-time current (kA) Ith = 100 - 300 x In (max 80) Rated dynamic current (kA) Idyn ■ 2.5 x Ith Class of insulation E Weight (kg) 26 28 38 Creepage distance (mm) 545 745 1055 Creep per kV line-to-line voltage (cnVkV) 4.54 3.1 2.93 Cantilever strength (N) >5000