A. Measurement purposes
B. Instrumentation
C. Protection
D. All of the above
Answer: D. All of the above
Explanation:
B. Instrumentation
C. Protection
D. All of the above
Answer: D. All of the above
Explanation:
- A current transformer plays the measurement, instrumentation as well as protection roles in power systems.
- A current transformer is a device that is used for the transformation of current from a higher value into a proportionate current to a lower value.
- It transforms the high voltage current into the low voltage current due to which the heavy current flows through the transmission lines is safely monitored by the ammeter.
- The current transformer is used with the AC instrument, meters or control apparatus where the current to be measured is of such magnitude that the meter or instrument coil cannot conveniently be made of sufficient current-carrying capacity.
- The primary and secondary current of the current transformers are proportional to each other. The current transformer is used for measuring the high voltage current because of the difficulty of inadequate insulation in the meter itself. The current transformer is used in meters for measuring the current up to 100 amperes.
- These transformers are used to measure electric power in powerhouses, industries, grid stations, control rooms in industries for metering & analyzing the flow of current in the circuit and also for protection purposes.
- For control in high-voltage electrical sub-stations and the electrical grid
- To activate the protective relay in case of a fault current and isolate a part of or the full system from the main supply
- The two main application areas of Current Transformers are current measurement and protection. They are also used for isolation between high voltage power circuits and measuring instruments. This not only ensures safety of the operator but also of the end device in use. It is recommended to apply current transformers for currents of 40A or higher.