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LIGHTNING PROTECTION SYSTEM IMPROVEMENT ON EXTRA - bgdileep.deepu - 10-04-2017 LIGHTNING PROTECTION SYSTEM IMPROVEMENT ON EXTRA HIGH VOLTAGE 500 KV TRANSMISSION LINES IN INDONESIA USING EXTENDED MAST TERMINAL [attachment=18194] I. INTRODUCTION Lightning overvoltage that happened at electric power system could be caused by two kinds of lightning strikes, which are indirect and direct strikes. Cases of direct strikes on transmission lines, lighting can strike at phase conductor, tower and ground wire. While indirect strikes is strike to the ground which reside near by transmission lines. Lightning direct strikes cause more problems in Extra High Voltage Transmission lines. Strikes at phase conductor may result flashover at insulator, and strikes at transmission tower or ground wire may result back flashover. Both have potency to bother the lines performance in transmitting electric power; in this case will be read as phase to the ground problem generating the opening of Circuit Breaker at the end of transmission lines. Other effects of flashover are quality degradation of insulator and broken insulator (glass type) which is needed to perform replacement of insulator. II. 500 KV EHV LINES PAITON KEDIRI LIGHTNING DATA Before the installation of Extended Mast Terminal at 500 kV EHV lines Paiton Kediri, Lightning Data analysis was done to determine the regions in path of EHV lines that have high density of lightning strikes. This lightning data also very useful to predict lightning cycle that happened in area of around EHV lines so that care to lightning strikes at the lines can be concentrated at the time of high lightning strikes frequency. Center of obsevation for the lightning data is - 7.75023 S , 112.8069 E. This coordinate is used as reference to derive lightning data from Jaringan Deteksi Petir Nasional (JADPEN) which using Lightning Position and Tracking System (LPATS) technology. The border of the data window is West : 111.9025 E, East : 113.7114 E, north : 7.4789 S, and South : 8.0216 S. Lightning data was taken from January 1st 1996 till December 31st 2000. VI. CONCLUSION Lightning Protection System using Extended Mast Terminal is a new innovation compared to the conventional protection used used at transmission lines which is ground wire. Lightning strike on Extended Mast Terminal will prevent lightning current parameter read the towers parameters. The lightning current will only flow inside double shielded down conductor cable which has very low inductance value (0.0037 microHenry) and it will reduce the tower voltages due to the steepness of the lightning current and reduce also the voltage stress accros the insulators and prevent back flashover. Installation of Extended Mast Terminal at tower 353 on 500 kV EHV lines Paiton-Kediri prevent back flashover that lead to the insualtors damages. No broken insulators were found after installing the EMT on tower 353 since early 2007. Lightning strikes data collected during period of 2007-2008 indicate that the installation of EMT have protected the tower from lightning direct strikes. Lightning current data which have been collected shows that 8 data took place at transition season on month March, April and May. |