EMC And Finite Element Analysis For Wireless Temperature Detecting Device Of High-Voltage Transformer Substation

As national economy develops rapidly and people's living standard becomes higher, the electricity demand as well as load of power system increases accordingly. Aging of power equipments is serious and power accidents occur frequently because of longtime high load operation and lack of renewal and maintenance in time, which always causes irremediable loss. As a new real-time supervision method, wireless temperature detecting technology has advantages of saving space, reducing complexity of substations and conveniently installing and safeguarding, compared with traditional temperature detecting methods. However, equipments in substations are numerous and the electromagnetic environment is complex. Various inerfereces may affect the wireless temperature detecting device. So it is necessary to study electromagnetic compatibility in substations.Electromagnetic environment in substations is analyzed and the main interference sources to the wireless temperature detecting device are found out in this paper. Anti-interference performance of the device is studied with the concept of port and corresponding anti-interference methods are concluded.Shielding property of metal plate and metal wire mesh made of several kinds of common materials is compared by use of the shielding theory and Schelkunoff formula for calculating. The method of metal wire mesh used as shielding scheme for the wireless temperature detecting device in substations is proposed for the first time.Finite element analysis with ANSYS software is firstly applied to the wireless temperature detecting device in high-voltage substations. The electromagnetic field near the device is simulated and the possible influence on the secondary equipments of substations caused by the electromagnetic field is discussed. The dependability of the wireless temperature device operating in substations is proved theoretically.