Resin cast current transformers are available for metering and protection application. These current transformers are mainly fabricated according to client’s specification. Ct coils are encapsulated in cast resin (polyester / epoxy). Secondary terminals are provided with either screws or studs. The main insulation between primary and secondary and earth is obtained by this epoxy resin. These transformers are of compact design with high mechanical and electrical properties. These are non-hygroscopic and hence give very good insulation properties even in given humid conditions. General particulars Rated voltage: 11 kv Rated primary current: 100 a Rated secondary current: 1a or 5a Rate burden: 5va Rated frequency: 50hz Accuracy class: 0.5 or 0.5s Temperature: as per is-2705/1992 Highest system voltage: 12kv Insulation level: 28kvrms/75kv(p) Stc: 13.1ka for 1 sec Continues thermal current: 1.2 times of rated current Core material: crgo Copper wire material: enameled wire as per is-4800 part-4 or iec-317 Insulation class/material: epoxy resin Secondary terminal: m5 brass bolt with nut &washer or m5 threaded bush with screw &washer Primary terminal p1 & p2 size and material Mounting base: ms 5mm thick zinc plated Rountine test :as per is-2705/1992
