The substations have current and voltage transformers designed to segregate electrically the high voltage primary circuit from the low voltage secondary circuit and, consequently, offer a safe means of supply for signifying instruments, meters, relays and so on. 1) Current Transformer: Current transformers are utilized in power installations for supplying the current circuits of indicating instruments (i.e., ammeter, watt-meter, and so forth), meters (i.e., energy meter, and so forth) and protective relays. Such transformers are designed to offer a standard secondary current output of 1 or 5 A, whenever rated current flows via the primary. The fundamental feature of CT is its transformation ratio, symbolized since a ratio of the rated primary to rated secondary current. Current transformers have two inherent errors, that is, the current ratio and phase displacement. Such two errors serve as a basis on which current transformers are categorized for accuracy. ...
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