Tranquility smart meter is an energy reading and data transmission device to be used in 3 phase or 1 phase environment. The device consist of two modules which could be placed easily at sites to be measured. The hardware design is done such to ensure that the device will be very modular when used in installation and could be accommodated in various configurations without having to cost space inside the Mains MCB as with various other units
The Smart meter is divided into two modules consisting of a current sensing unit and a module housing all the power calculation parameters.T shaped smaller module make up as the current sensing unit consisting of three current sensing devices. It just need a simple wired setup to be powered in order to transfer readings to second module fitted outside. Current sensing is done non- invasively through Hall Effect technique capable of handling current up to 50A.
The second module consist of elements like the measurement unit, switching unit, communication unit and SMPS. The module does not require outside adapters as it has a built in SMPS to power itself and power the current sensing unit as well. Smart meter uses isolated technique to make its reading so as to make it less risky for the user as possible. In order to attain it device is powered by isolated SMPS. To add to this, device is constructed to measure isolated voltage and current readings with the specification of Short term isolation voltage (2s) for 4.6kVrms, 6.5 kVDC and basic isolation voltage of 4000V for each unit respectively.Energy measurement device could calculate the following parameters including Real power, Reactive power, PF, Voltage and current per each phase. The device could be easily configured to be refreshing data at user designated time period expressed in milliseconds with the minimum stipulated time to be 500ms. The data that has been generated will be transferred wirelessly though various zigbee modules. The device also has wired connectivity options like I2C and UART. The communication protocol to extract the data from the energy module can be extracted using any other protocol to individual specific requirement as and when specified by the user.