Current transformers are basically used as it is not possible to use line current directly for measurement and relaying purpose due to its high value and insulation problem. CURRENT TRANSFORMER which is widely known as 'CT' is a piece of electrical equipment which converts line current (primary current) in to small standard current values which are suitable for the devices to which it is connected e.g., measuring instruments, meters, protection relays.
CTs are available from 5A to 5000A with an accuracy of 0.2%, 0.5%, 1% & 5% as per IS 2705. Standard secondary current is 1A & 5A. Toroidal (round) and rectangular CTs are manufactured to suit various busbar sizes.
Some of our Basic Functions for our Current Transformers is to reduce line current to a value which is suitable for standard measuring instruments, relays etc. Also, it is required to isolate the measuring instruments, meters, relays etc. from a line voltage of an installation.
Apart from it, our current transformers are used to protect measuring instruments against short circuit currents as well as to sense abnormalities in current and give current signals to protective relays to isolate the defective system.
YOKINS MANUFACTURES VARIOUS TYPE INCLUDING: