Torotrans providesoffers a range of toroidal transformers. Various constructional features of transformer include: a toroidal transformer has ring type core. This core is made from cold rolled grain oriented [crgo] silicon steel strip without any joints and annealed for stress relief after being wound. These wound cores are then suitably insulated by class b insulation and the winding of copper wire is usually done by winding machines. Current transformers find their applications in are used for electrical measuring instruments and/or electrical protective devices and are also applied in . They are very useful high power circuits where the current is large. Current transformers arc subdivided into two main categories - measuring current transformers and protective current transformers. The former are used in measuring and indicating current that is to reduce the line current to a value which is suitable for standard measuring instruments, relays, etc. The latter are used for over current and undercurrent relaying for power circuit protection. Current transformers are normally categorised as ring/bar type and wound primary type. Electrical specifications of these toroidal current transformers are: type -ring and wound type, tape insulated ring type and epoxy resin potting type primary current50 a to 3000 a in ring type, 25 a to 600 a in epoxy resin secondary current - 5 a and 1 a for ring type, 0.2, 0.1 and 0.05 a for epoxy resin [other on request] burden - 5, 10, 15 va for ring type, 0.25, 0.5, 1 and 2 va for epoxy resin type [other on request]. Accuracy class0.2, 0.5, 1.0, 5.0, 10.0. Frequency - 50 hz operating temp10°c to 40°c conforms to: is 2705. The former finds its applications in measuring and indicating current that is to reduce the line current to a value which is best suited for standard measuring instruments, relays, etc. The latter are used for over current and undercurrent relaying for power circuit protection. Current transformers are normally categorised as ring/bar type and wound primary type.
