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