Reynaldo Zoro

Lightning performance on overhead distribution lines: field observation at West Java - Indonesia

After the completion of lightning study on Perusahaan Listrik Negaras (PLN-States Electricity Company of Indonesia) overhead distribution lines at city Depok in West Java by Laboratory of High Voltage and High Current Engineering of Institute of Technology in Bandung (ITB) in 2002, PLN has done several improvement by installing the overhead ground wire, improvement of grounding system and relocation of lightning arrester on the lines. Although the installation was concentrated only at main distribution lines of several existing feeders, better lightning performances of the lines are achieved and significant outages reduces were reported. And now since the end of year 2004 the lightning performance observation of the overhead distribution lines is still being done up till now by ITB in corporation with PLN. This observation is willing to study that the reduced outages was gained by improving the main distribution line compare to the lightning performance of other lines, in the nearby area. The purpose of the study is to get the lightning data from the improved distribution lines that the improvement has made significant results to the lightning performance in the area with very high lightning density. The study is carried out by field observation of lightning on improved distribution lines by using video camera installed at the top of 20 kV pole connected to the control room nearby. For measurement of lightning strikes at the other distribution lines the lightning counters and magnetic tapes for peak lightning current measurement were installed and measured

Observation of Lightning Discharges in Indonesia by Lightning Detection Network

A real-time lightning location network started to operate in Indonesia in mid 1995 and began providing reliable data in the end of the same year. The network consists of 8 signal receiving stations and works using the Time-Of-Arrival (TOA) technique. Area covered by the network includes: Java Island, Bali Island, Southern part of Sumatra Island, Southern part of Kalimantan Island, and Southern part of Sulawesi Island. The present work reports on the lightning stroke density obtained by the TOA network for 5 consecutive years from 1996 to 2000 on the Java Island. Maps of the lightning stroke density and its annual variations are presented. Further, monthly variation of the detected lightning strokes is also discussed. Lightning activity on the Island shows a consistent high density. The spatial and temporal distribution of lightning activity on the Island as reported by Hidayat and Ishii are confirmed. The density obtained using the present network is comparable to that reported by Hidayat and Ishii. On the other hand, the current amplitude is almost two-fold higher with an increasing tendency from 1995 to 1999

The use of wind turbine structure for lightning protection system

Indonesa has a very good location for the source of renewable energy from wind. Wind turbin need a toll structure to get the good turbin performance. Indonesa is located at the equator and has lightning characteristic differ from the characteristic measured in sub-tropical region. The later one are used as the basic data for the international lightning protection standards. This research was carried out to evaluate the protection system for protecting the components of wind turbined againts tropical direct lightning strike to the structures or wing blades. The characteristic of structure and its components were analysized. Lightning strikes hit the blade as the highest structures of the turbine and the lightning current distributed through the components and dispersed it to the grounding systems. Due to the fact that the location of this wind turbine is in the tropical area such as Nusa Penida in Bali, the tropical lightning characteristic play an important role to determine the protection system for the components and the structures. This study analyze the protection system that allow the current flow to the grounding system without disturbing the electric converter, mechanics, and electronics performance of the turbine by using their own structures. Local lightning characteristics in the region and the protections system design were derived from this study according to the frame of IEC standards with the use of tropical lighning parameters.

Insulator Damages due to Lightning Strikes in Power System : Some Experiences in Indonesia

Lightning is a major cause of insulator damages in power system in Indonesia. Located in tropical country with the highest lightning density, Indonesian electrical companies suffering a big outages number caused by lightning. According to Indonesian national electrical company, Perusahaan Listrik Negara (PLN), over 56% outages in their 500 kV system is caused by lightning, and for 150 kV, 70 kV and 20 kV systems the statistics are 28%, 69%, and 90%, respectively. This paper contents some record of the insulator damages in Indonesian power system, and some improvement that has been done

Review of 20 kV Overhead Distribution Lines Reliability Against Lightning at PLN APJ Bogor

Because the low insulation strength of distribution lines, virtually all strokes that terminate on the phase conductors of a distribution lines will result in flashover. However, in some cases, shield wire may provide some measure of protection from these direct strokes. Distribution lines are also subjected to over voltages induced by strokes that terminate adjacent to the line. In fact, most of the flashovers that occur are cause by these induced voltages. This paper gives a review on existing condition on unimproved distribution lines in Bogor and some improvement that has to be made. Bogor is well known as a highest lightning activity area in Indonesia, with over 300 thunderstorm days a year

Multi-chamber arrester study at tropical area for 20 kV lines lightning protection system

This paper issues on 20kV overhead lines related to lightning strike to the medium voltage line and the consequences of lightning overvoltage at the tropical Area like Serpong area near Jakarta. Few standard lightning protection solutions are discussed in terms of expected performance and limitations. Implementation of Multi-Chamber Arrester (MCA) and the research results after 1 year of operation in the tropical area with high lightning density (>15 flashes per km2 per year) in Jakarta region are presented.

Lightning protection system on overhead distribution line using Multi Chamber Arrester

New innovation on arrester technology has been made by appearance of Multi Chamber Arrester (MCA). This kind of arrester has basic principle similar to previous technology which use air gap and air pressure in chamber as its technology. MCA has a function to protect overhead line from lightning. For instance, 20 kV medium voltage overhead line.

Damages of insulators due to lightning strikes in Indonesian power system

Lightning is a major cause of insulator damages in power system in Indonesia. Located in tropical country with the very high lightning density, Indonesian electrical companies & Private companies are suffering a big outages number caused by lightning. According to Indonesian state electrical company, Perusahaan Listrik Negara (PLN), over 56% outages in their 500 kV system is caused by lightning, and for 150 kV, 70 kV and 20 kV system the statistics are 28%, 69%[3], and 90%[7], respectively. This paper contents some record of the insulator damages in Indonesian power system, and some improvement that has been done.

Lightning protection system improvement on Extra High Voltage 500 kV Transmission Lines in Indonesia using extended mast terminal

500 kV Extra High Voltage Transmission Lines, which have higher insulation level than other transmission lines with lower voltage level, should have more strength against lightning strikes. But in reality several problems appear. Broken insulators due to lightning strikes are often found in 500 kV EHV lines. Research on these problems was carried out at Paiton-Kediri lines. It took place especially in the areas that have higher lightning density. Broken insulator can cause lack of insulation strength and potentially reduce lines performance due to outages on the lines.

Analysis of lightning strike to overhead EHV 500 KV transmission system Jawa-Bali Crossing

One of the technical problems in the construction of overhead lines 500 kV EHV transmission system Jawa-Bali Crossing is lightning disturbance. The most dominant problem is the height of the crossing tower (376 m) and high density of lightning strikes at the tower site. The potential disruption caused by lightning in the tower leads to insulator flashover on towers that can cause a loss of power flow at 500 kV line system. Calculation and analysis of each potential lightning disturbance at 500 kV EHV overhead lines can be used as an adequate reference to technical measures in designing protection against lightning strikes for the overhead lines 500 kV EHV transmission system Jawa - Bali Crossing.