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Teknik Transmisi Tenaga Listrik(Jilid3).Edt.indd

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• Untuk system 150 dan 500 kV:<br />

R b = 8 × Zone-1 × k 0 × 2<br />

9.10.12 Directional<br />

Comparison Relai<br />

Relai penghantar yang<br />

prinsip kerjanya membandingkan<br />

arah gangguan, jika kedua relai<br />

pada penghantar merasakan<br />

gangguan di depannya maka relai<br />

akan bekerja. Cara kerjanya ada<br />

yang menggunakan directional<br />

impedans, directional current,<br />

dan superimposed.<br />

Gambar 9.17 Directional comparison relai<br />

617

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