Tower-Footing Resistance and Lightning Trip-outs of 150 kV Transmission Lines in West Sumatra in Indonesia

Abstract

The trip-out rates calculated by taking account of the reduction in the tower-footing resistance due to the ionizing effect agree well with the observed ones. This indicates the importance of the impulse resistance in the analysis of the lightning performance of the line. The trip-out rate at the lower arm is high for the cases of the average grounding resistance of 33.3 ohms, and the rates at the upper arm are high for the cases of the average grounding resistance of 5.6 ohms. Such à trend can be simulated by the IEEE method using the impulse resistance. The trend for the trip-out ratio to become high with the increase in the span length is significant after improvement of the tower-footing resistance. However, the trend is weak before improvement of the tower-footing resistance. This is because in the case of the high tower-footing resistance the flashover occurs before the arrival of the wave reflected from the adjacent towers due to the high potential rise of the tower. Therefore, the degree of the influence of the span length on the trip-out ratio is dependent on the tower-footing resistance. The local lightning activity significantly affects the trip-out rate.

Design of a Lightning Protection System for an Overhead 3 kV DC Electrified Railway Line: A Case Study from South Africa

“…This is performed using (4) [17], where: Rf represents the footing resistance, R0 is the footing resistance at low current and frequency, E0 is the soil ionization gradient, and ρ is the soil resistivity. Typical towers have a footing resistance of 24 -50 Ω, as observed in [18]. Literature further indicates that a higher tower footing resistance may lead to a higher trip-out rate [18].…”

“…Typical towers have a footing resistance of 24 -50 Ω, as observed in [18]. Literature further indicates that a higher tower footing resistance may lead to a higher trip-out rate [18]. A trip-out refers to the operation of a substation's circuit breaker, due to a lightning-induced flashover.…”

Desain Prototype Penambahan Arrester pada Arcing Horn (Saluran Transmisi Payakumbuh-Kotopanjang 150 kv pada Area Cadas)

“…Saluran udara cukup rentan terhadap sambaran petir karena konstruksinya yang tinggi (Warmi dan Ismail, 2018) (Warmi dan Michishita, 2015). saluran transmisi 150 kV dari Payakumbuh ke Koto Panjang di Sumatera Barat, melewati daerah yang rata-rata hari badai petir per tahun (IKL: tingkat Isokeranik) mencapai 173 hari/tahun, dan frekuensi sambaran petir langsung ke saluran transmisi sangat tinggi (Warmi dan Michishita, 2016) (Warmi dan Michishita, 2018) (Warmi dan Ananda, 2019). kinerja petir menjadi salah satu yang paling penting sebagai bagian dari saluran transmisi, karena sebagian besar transmisi pemadaman listrik disebabkan oleh petir (Pham dkk., 2012).…”

Analisis Variasi Ketebalan Coating Senyawa Glasir terhadap Daya Tahan Dielektrik Isolator Keramik Saluran Transmisi 150kV

“…Dari lokasi tower tersebut sebanyak 63% daerah perbukitan terdapat 82% jumlah flashover, sedangkan 16% dan 2% masing-masing untuk jumlah flashover daerah sawah dan gurun. Hal tersebut terjadi karena saluran transmisi 150kV Payakumbuh-Koto Panjang terdapat tower 1-140 berada pada daerah dengan hari guruh pertahun/IKL sebanyak 165 hari/tahun (Warmi & Michishita, 2018).…”

“…Jika volatase ini sama atau melebihi garis kritis tegangan flashover, maka akan terjadi flashover. Persamaan (1) merupakan rumus yang digunakan dalam menghitung Critical Flashover (CFO)(Warmi & Michishita, 2018).Dimana, D merupakan jarak arching horn (m) dan t waktu tempuh gelombang petir (µs). Metode Anderson tentang backflashover memiliki 38 langkah akan tetapi pada penelitian kali ini hanya menggunakan langkah pertama saja, yaitu menghitung tegangan tembus isolator atau CFO.…”