GIS용 피뢰기를 위한 상태감시 및 열화진단 시스템의 구현

Abstract

Lightning arresters protect electric equipments from overvoltage such as lightning or abnormal voltage. If the lightning arresters does not work properly, the equipments could be break down due to the overvoltage. Among many others, an important cause that might lead to the malfunction of lightning arresters in aging, which can result in accidents like a general failure of power supply or an electric shock, and so on. Therefore, monitoring and aging diagnosis of the lightning arresters are very important. However, existing lightning arresters are equipped whit a simple monitoring capabilities without aging diagnosis.

In this thesis, we proposes a monitoring and aging diagnosis system for lightning arresters. The proposed system can monitor several lightning arresters simultaneously and uses the XBee module to communicate with the lightning arresters by radio frequency. The proposed system consists of 4 modules: communication, GUI, database, and aging diagnosis modules. The communication module sends IDs of lightning arresters and the current time, and receives measured data from lightning arresters. The GUI module displays the measured data and variations of the measured data depending on time. The database module stores and manages the measured data. Aging diagnosis module analyzes status of lightning arresters and determine if the lightning arresters have aging problem.

The proposed system is implemented by C++ language and MySQL 5.0. As the result, installation expense of lightning arresters can be reduced thanks to the monitoring capability of several lightning arresters simultaneously and electric power accidents can be prevented due to diagnosing aging of lightning arresters.

In the future, this system could be extended in order to monitor lightning arresters through the Web.