A design of substation temperature online monitoring system based on SAW temperature sensor

Temperature is an important aspect to reflect the status of substation power equipment. The temperature monitoring by manual inspection is inaccurate and poor continuity. And it may cause abnormal operating conditions missed or faults occurred. So temperature monitoring on substation power equipment is important. The SAW temperature sensor gets the temperature data by measuring the velocity change of SAW. The velocity of SAW is influenced by the temperature of the piezoelectric crystal. Thus, the sensor is suitable for a high voltage and complex electromagnetic environment. In summary, a substation temperature on-line monitoring system based on SAW temperature sensor is put forward. Then the principle of SAW temperature sensor is explained. The reader and the transponder of SAW temperature sensor have been designed and a method of data transmitting and power supply based on Power over Ethernet is put forward. An IEC 61850 standard compatible IED temperature monitoring model has been established. And also achieve the standard communication between the temperature monitoring system and the intelligent substation.