How Current transmitter can be used for motor protection, and how is it installed?
Where to install the current transmitter- in MCC or elsewhere?
The current transmitter to which you referr may be a 4-20ma industrial control signal. Such a signal is scaled to represent a physical property like a temperature , voltage , flow rate or inthis case an amperage draw by a motor..
Motors have thermal overload and over current trips that are mechanical in nature and built into the motor control.
It is possible to use a PLC and monitor the current flow of a motor. The current flow sensor would most likely be a current transformer that connects to a 4-20ma current transmitter. And would be installed in the motor starter(control) located in the MCC. The 4-20ma signal is then processed by a PLC located nearby which can run a program designed to control the motor and limit the motor operation based on that current reading. The PLC can also pass information to/from a central control room and operators can remotely control teh operation of the motor via HMI (Human Machine Interface) .
Hall-Effect Based Current Sensors