Extended Mast Terminal for Lightning Protection System Improvement on transmission Lines in Indonesia Prof.Dr. Reynaldo Zoro Lightning Research Center School for Electrical Engineering and Informatics Institut Teknologi Bandung – ITB Bandung - Indonesia
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Extended Mast Terminal for Lightning Protection System Improvement
on transmission Lines in Indonesia
Prof.Dr. Reynaldo ZoroLightning Research CenterSchool for Electrical Engineering and InformaticsInstitut Teknologi Bandung – ITBBandung - Indonesia
Content
• Introduction • Lightning Data• Lightning Protection System • Experience on Improvement of LPS for HV and EHV
lines
Indonesia; Maritime ContinentSt. Petersburg, Rusia
Java Island & Bali
Bali IslandEast Java
Overvoltage due to Lighnting at Transmission Lines
• Using the additional iron bar inside the fondation structure
• According to IEC 62305 – 1 / 2006
GROUNDING IMPEDANCEGROUNDING IMPEDANCE
Overhead Ground Wire….
11
THREE OHGW 275 kV Lines
12
Insulators….
13
BACK FLASHOVER ON TRANSMISSION LINE
TOWERBackflashover voltage :
Vin = R.i + L.di/dt
050
m675.3
m35.3
m45.3
m575.3
m4.5
m5.6
Disc1816
m5.7
m5.6
Disc1816
Disc1816 m5.44
'R
'S
'T
Tipycal Configuration of EHV 275 kV Lines
Removed and installation of tower insulator at Tower 130 L1 & 2 (20 disc) on 25 & 26 June 2002
TOWER no. 103 at 500 kV line Sub. Kediri – Sub. Paiton
18
Installation of TLA with MOA at 150 kV Line
PROTECTION DISTANCE
SURGEARRESTER; 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)
Protection Distance of Arrester at HV 150 kV Substations
L1
L2
Ltotal = L1 + L2
LIGHTNING DATA….
22
EHV Lines 500 kV JAVA - BALI
24
Lightning Flash Density di Java IslandRecorded by Indonesian LDN
Arus Puncak Petir
Prob
abilit
as
4
5
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
26
4
5
Kecuraman Arus Petir
Probabilitas
2
1
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
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.