Pengaruh Front Time terhadap Tegangan Residu Arester ZnO 18 kV

Riky Dwi Puriyanto, Avrin Nur Widiastuti


Abstract— Electrical system in Indonesia has two main parts that cannot be separated, the source (provider) and the load (end user). Various attempts have been taken to comply with the load requirement, one of them is by creating a reliable system. The reliability of the system can be achieved by protecting component system from power disturbances, e.g., overvoltage (surge). The characteristic of an surge is hard to define. Overvoltage that travels in the transmission line is affected by the line impedance and may cause an alteration in the characteristics of the resulting waves. One of the alterations that may appear is front time value. This research presents a laboratory testing of an 18 kV Zinc- Oxide (ZnO) arrester with various front time values in the ra ngeof 0-30 μs. The various front time values can affect residual voltage with the average value which is equal to 39972.25 V for input voltage (Vpi) 60 kV and 42150 V for 100 kV. The increment of front time makes the value of residual voltage decrease, but the descent is not significant. The change of front time also can affect the residual voltage waveform as output of 18 kV ZnO arrester.

Intisari—Sistem kelistrikan di Indonesia memiliki dua bagian utama yang tidak dapat dipisahkan, yaitu sumber (penyedia) dan beban (pengguna). Berbagai upaya dilakukan untuk memenuhi kebutuhan beban, salah satunya adalah menciptakan sistem yang handal. Kehandalan sistem didapat salah satunya dengan melindungi peralatan sistem dari gangguan, khususnya tegangan lebih (surja). Karakteristik surja sulit untuk diprediksi. Surja yang mengalir dalam saluran dapat terpengaruh oleh impedans saluran dan mengakibatkan perubahan karakteristik gelombang yang dihasilkan. Salah satu perubahan yang mungkin muncul adalah perubahan nilai waktu muka (front time). Penelitian ini merupakan kegiatan pengujian skala laboratorium terhadap arester ZnO 18 kV dengan front time yang bervariasi antara 0-30 μs. Variasi front time dapat mempengaruhi nilai tegangan residu dengan nilai tegangan residu rata-rata arester ZnO 18 kV sebesar 39972.25 V untuk tegangan masukan Vpi 60 kV dan 42150 V untuk tegangan masukan 100 kV. Semakin besar nilai front time akan mengakibatkan penurunan tegangan residu, namun nilainya tidak terlalu signifikan. Perubahan front time juga mempengaruhi bentuk gelombang yang dihasilkan arester ZnO 18 kV.

Kata Kunci— tegangan lebih, arester ZnO, front time, tegangan residu.

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