Research Of Transmission And Distribution Equipment On-line Monitoring System Based On Integration Of WSN And RFID

IoT (Iternet of Things) has many similarities with smart grid technology. If IoT is applied in smart grid, it will improve the informationization level, energy utilization and operation reliability of smart grid. The smart grid for IoT is an important direction of future development. Power transmission and transformation equipments are the essential parts of smart grid, so Power transmission and transformation equipments’ running state directly affect the operation of overall smart grid. Therefore, on-line monitoring of power transmission and transformation equipment is the foundation of the smart grid reliable operating. This paper makes full use of the advantages of the IoT, we make a deep research about the power transmission and transformation equipment on-line monitoring system which is based on integrating RPID (Radio Frequency Identification) and WSN (Wireless Sensor Network), the main research content includes the following several aspects.In view of the traditional power transmission and transformation equipment on-line monitoring system is difficult to locate the fault equipments accurately and monitor multi-parameters simultaneously, and put forward a new type of power transmission and transformation equipment on-line monitoring system, which is divided into information perception layer, data communication, information fusion layer and integrated application layer. I has carried on the detailed introduction to the function of each layer, realizing the power transmission and transformation equipments multi-parameter centralized monitoring and fault forecasting warning and accurate positioning.This paper proposes a new transmission network that is based on discussing the four common integration of RFID and WSN in details. Multi-mode transmission network is mainly composed of condition monitoring of intelligent electronic device (IED) and main IED. Condition monitoring of IED is composed of WSN nodes and RFID tag. In addition, main IED is composed of reader and sink node.Condition monitoring IED can communicate with mian IED by RFID technology and Zigbee technology in the multi-mode transmission network. Condition monitoring IED priority uses RFID technology to communicate with mian IED, which is based on the simple protocol and low energy consumption of RFID.And it will reduces the overall energy consumption of the network. Condition monitoring IED will communicate with mian IED by Zigbee technology when RFID’s communication condition cannot meet the state. This paper designs a RFID priority strategy and communication mode switching algorithm for Multi-mode transmission network, which enables to switch communication mode intelligently between condition monitoring IED and main IED.This paper mainly researches the IED that is used for condition monitoring, and expounds the hardware selection of condition monitoring IED in detail. In order to reduce the energy consumption of condition monitoring IED, this paper designs a RFID wake-up mechanism. RFID wake-up mechanism enables a condition monitoring IED to put both its radio and microprocessor in the deepest sleep mode when the condition monitoring IED has no communication activity. If the condition monitoring IED has a packet to send, the main IED send a RFID wake-up signal to condition monitoring IED, and condition monitoring IED can be awoken by an external interrupt from the RFID tag attached to the MCU. Then this paper compares the performance of RFID wake-up mechanism relative to two widely used MAC protocols, BMAC and IEEE 802.15.4, through Matlab simulations. The results confirm that RFID wake-up mechanism reduces the energy consumption.The condition monitoring IED was designed with modular thought, this paper tests integration of sensor and tag which is the part of condition monitoring IED. Integration of sensor and tag which is the part of condition monitoring IED is named sensor tag. According to the results of simulation and test, return loss of the sensor tag’s antenna is about -13.1dB, the maximum read range of the sensor tag is 18m when the carrier frequency is 865.8Mhz, drive current and active current of the IED is 520 μA and 210 μA.The results indicate that the sensor tag is better than SL9000A.