Kapco LT Resin Cast Transformer

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 values which are suitable for the devices to which is connected e.g. Measuring instruments, meters, protection relays.
Basic functions of cts are :
1. To reduce line current to a value which is suitable for measuring instruments, relays etc.
2. To isolate the measuring instruments, meters, relays etc. From line voltage of an installation.
3. To protect measuring instruments against short circuit currents
4. To sense abnormalities in current and give current signals to protective relays to isolate the defective system