||Because that the smart grid’s development is becoming common, more and more scientists pay attention to the maintenance and management of electricity. The system fault current could reach hundreds of times the rated current and we can return the cable state with communication technology to achieve the monitoring of power line and clean the fault, this thesis proposes a collection of smart grid distribution current and fault location system to execute the timely protection of the power line system. However, most of the monitoring device use a battery as a power supply with capacity and maintenance constraints in the past. Therefore, this thesis uses stably the power harvesting current technology combined with current measuring technology, to stably monitor the state of cable in real-time and to protect the power system. |
The traditional fault indicators mostly use wired transmission and are not accurate. To save money and expand the site of installation, this paper uses wireless communication technology and current transformer measuring scheme. This thesis develops a current and autonomous power supply device by integration of a current power harvesting chip, a current transformer and a Radio-Frequency (RF) communication module.
When the power line fault occurs, the abnormal line current can be detected by the application of fault indicator in smart grids. Then, the RF communication module would indicate the fault to the control station, to assist the maintenance person timely to indicate the fault and improve the power quality.