The main aim of the project is to acquire data of distribution transformers remotely by GSM modem or XBEE. For this real-time scenario we can take one temperature sensor, 3 potential transformer and 3 current transformer for monitoring these 3 data of the transformer and then send the same to a remote location.
3 analog value are taken in multiplexing mode connected to a programmable microcontroller of 8051 family through an IC ADC 0808. Then the values of all the sensors are sent sequentially as per the frequency of multiplexing of the ADC by MC .They are then sent directly to XBEE module operating at 2.4GHz for transmitting the same data.
Remote receiver is also a microcontroller based unit that receives not only the real time data but also the error signal along with to operate corresponding realy for any action with LCD display.
The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.