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Prof. Dr. Reynaldo Zoro L ightning Research Center

Extended Mast T erminal for L ightning P rotection System Improvement on transmission L ines in Indonesia. Prof. Dr. Reynaldo Zoro L ightning Research Center School for Electrical Engineering and Informatics Institut Teknologi Bandung – ITB Bandung - Indonesia. Content.

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Prof. Dr. Reynaldo Zoro L ightning Research Center

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  1. Extended Mast Terminal for Lightning Protection SystemImprovement on transmission Lines in Indonesia Prof.Dr. Reynaldo Zoro Lightning Research Center School for Electrical Engineering and Informatics Institut Teknologi Bandung – ITB Bandung - Indonesia

  2. Content • Introduction • Lightning Data • Lightning Protection System • Experience on Improvement of LPS for HV and EHV lines

  3. Indonesia; Maritime Continent St. Petersburg, Rusia

  4. Java Island & Bali East Java Bali Island

  5. Overvoltage due to Lighnting at Transmission Lines

  6. Improvement of LPS Conventional • Grounding System • Ground Wire • Insulators • Surge Arrester & Transmission LineArrester

  7. Grounding System….

  8. Natural Grounding • Using the additional iron bar inside the fondation structure • According to IEC 62305 – 1 / 2006

  9. GROUNDING IMPEDANCE

  10. Overhead Ground Wire….

  11. THREE OHGW 275 kV Lines

  12. Insulators….

  13. BACK FLASHOVER ON TRANSMISSION LINE

  14. TOWERBackflashover voltage :Vin = R.i + L.di/dt Tipycal Configuration of EHV 275 kV Lines

  15. Removed and installation of tower insulator at Tower 130 L1 & 2 (20 disc) on 25 & 26 June 2002

  16. TOWER no. 103 at 500 kV line Sub. Kediri – Sub. Paiton

  17. Installation of TLA with MOA at 150 kV Line

  18. PROTECTION DISTANCESURGEARRESTER; L = (Ut – Ua). v 2.(x di/dt) L (meter)Ut BIL Transformer (kV)Ua Voltage Discharge SA (kV)du/dt = x di/dt (kV/us)di/dt Steepness of impuls current (kA/us)Surge Impedance (ohm)

  19. Protection Distance of Arrester at HV 150 kV Substations Ltotal = L1 + L2 L1 L2

  20. LIGHTNING DATA….

  21. EHV Lines 500 kV JAVA - BALI

  22. Lightning Flash Density di Java Island Recorded by Indonesian LDN

  23. Statistic of Lightning Current in Tropical and Sub-Tropical Area Europe by Karl Berger, measured at Mt San Salvatore, Switzerland : (1) petir pertama total, (2) petir negatif, (3) petir positif. Indonesia by Reynaldo Zoro, measured at Mt Tangkuban Perahu : (4) petir negatif, (5) petir positif

  24. Statistic of steepness of lightning current in tropical dan sub-tropical area (1) Europe by Karl Berger, measured at Mt San Salvatore, Switzerland. (2) Indonesia by Reynaldo Zoro, measured at Mt Tangkuban Perahu

  25. Summary of lightning characteristic in Indonesia

  26. LIGHTNING PROTECTION SYSTEM ….

  27. INSTALLATION OF EXTENDED MAST TERMINAL (EMT) FOR TOWER PROTECTION …. Vin = R.i + L.di/dt

  28. Lightning Strikes around EHV lines 500 kV Paiton Kediri (square : higher lightning density) & location of research towers. Figure 1. Lightning Strikes around EHV lines 500 kV Paiton Kediri (square : higher lightning density) & location of research towers. TOWER 353 TOWER 103

  29. EMT on 500 kV Paiton-Kediri (as extended mast)

  30. Proteksi Tower 500 kV dengan EMT

  31. Result of Magnetic Tape Peak Current Measurement courtessy of Dr. Ir. Reynaldo Zoro

  32. Result of Measurement (temporary results)

  33. Insulator Broken Data compare to Severity Index

  34. Lightning Rod Isolated from the Tower Bordes for Measuring & Maintenance H = 376 m Double shielded down conductor 1 x 70 mm² Foundation Grouding & Counterpoise

  35. Conclusion • Lightning Protection System using Extended Mast Terminal is a new innovation compared to the conventional protection used used at transmission lines. • Lightning strike on Extended Mast Terminal will prevent lightning current parameter to “read” the towers parameters. The lightning current will only flow inside double shielded down conductor cable which has very low inductance value ( < 0.03 microHenry/meter) 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 and 103 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 and 103 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.

  36. Thank You….

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