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Evaluation Of Lightning Performance 500 kV Extra High Voltage Transmission And Determination Of Critical Spots By Using Severity Index Method (Case Study on Paiton-Kediri 500 kV EHV Transmission)

Master Theses from JBPTITBPP / 2009-01-27 15:16:53
By : EKO YUDO PRAMONO (NIM 23205024), S2 - Electrical Engineering
Created : 2007, with 7 files

Keyword : Kinerja SUTET 500 kV terhadap petir, Parameter petir, Kegagalan perlindungan, Laju lewat denyar balik, Kerapatan sambaran petir, Pentanahan kaki menara, Severity index

SUTET 500 kV secara teori memiliki ketahanan lebih terhadap sambaran petir daripada SUTT 150 kV atau SUTT 70 kV, tetapi pada kasus SUTET 500 kV Paiton-Kediri sejak dioperasikan pada tahun 2002 sering ditemukan isolator pecah pada beberapa menara terutama pada musim hujan, isolator pecah beberapa kali menyebabkan tripnya SUTET 500 kV ini.

Berdasarkan hal tersebut perlu dilakukan penelitian untuk mendapatkan kinerja ketahanan saluran terhadap petir dengan memasukkan karakteristik petir pada daerah yang dilewati saluran, untuk menghitung kinerja ketahanan terhadap petir pada SUTET 500 kV Paiton - kediri dan untuk menentukan menara yang harus diperbaiki untuk memenuhi criteria kinerja yang diinginkan oleh PT. PLN P3B Jawa Bali.

Metode severity index dapat diterapkan untuk menentukan titik-titik rawan sepanjang saluran transmisi sehingga kita dapat mengetahui menara yang harus diperbaiki dengan pertimbangan alasan ekonomi.

Perhitungan indeks ini berdasarkan data kejadian sambaran petir pada koridor sepanjang saluran, dan dari evaluasi kemampuan isolator di menara terhadap tegangan petir untuk masing-masing menara sepanjang saluran, dengan mempertimbangkan parameter menara seperti tinggi menara, ketinggian kaki menara dan tahanan kaki menara.

Description Alternative :

Theoretically, Extra High Voltage (EHV) 500 kV transmission lines are more robust against lightning strikes than EHV 150 kV or 70 kV. However, in case of EHV 500 kV Paiton-Kediri in Java, after five-years operation, many insulators were broken by lightning strikes, especially during rainy season. A large number of broken insulator deterioted performance of the lines, in which many line outages occurred.

Based on that research must be done to get corresponding lightning performance of the line with involved the lightning characteristic of an area where the transmission passed, in order to calculated the lightning performance of 500 kV EHV Paiton-Kediri and to determine the tower which must be improve to fulfil performance of 500 kV EHV transmission that want by PT. PLN P3B Java Bali.

The severity index method could be applied to determine the critical spots along that transmission line so we can know which tower will be improve according with an economically reason.

The calculation of that index based on an historical lightning incidence in narrow strip along the line, and from evaluation of severity of lightning stress over the tower insulators for each tower along the line, with involved the tower parameters like tower height, tower altitude and tower footing resistance.

Copyrights : Copyright Â(c) 2001 by ITB Central Library. Verbatim copying and distribution of this entire article is permitted by author in any medium, provided this notice is preserved.

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