Abstract
This paper deals with the design, construction, instrumentation and testing of a GSM and ZIGBEE based monitoring system for the measurement of Overhead High Voltage (HV) Conductor Temperature and Sag. The main advantage of this concept is the real time direct measurement of the parameters (i.e., conductor sag and temperature) needed for the operation of the transmission system without intermediate measurement of conductor tension and ambient weather conditions, by which the temperature controlling of transmission lines conductors is realized the stoppage caused by raised temperature can be avoided and some accidents caused by the increased temperature can be avoided. The principle and the feature of GSM SMS and ZIGBEE communication are analyzed. The construction of this system is outlined, and the force modal of calculating the variety of the sag due to the increased temperature of conductors is built. Finally, the software and hardware design of the online temperature monitoring unit of conductors and fittings are outlined. In this paper, a self-designed industrial GSM module is selected to finish the transmission and the decoding of the monitoring data through AT command and coding of short message PDU