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Teknik Transmisi Tenaga Listrik(Jilid3).Edt.indd

Teknik Transmisi Tenaga Listrik(Jilid3).Edt.indd

Teknik Transmisi Tenaga Listrik(Jilid3).Edt.indd

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9.13.3 Relai gangguan<br />

hubung tanah<br />

Relai ini berfungsi untuk<br />

mengamankan transformator<br />

gangguan hubung tanah,<br />

di dalam dan di luar daerah<br />

pengaman transformator. Relai<br />

arah hubung tanah<br />

memerlukan operating signal<br />

dan polarising signal.<br />

Operating signal diperoleh dari<br />

arus residual melalui<br />

rangkaian trafo arus<br />

penghantar (Iop = 3Io)<br />

Gambar 9.28 Diagram phasor Torsi<br />

sedangkan polarising signal<br />

diperoleh dari tegangan<br />

residual. Tegangan residual<br />

dapat diperoleh dari rangkaian<br />

sekunder open delta trafo<br />

tegangan seperti pada<br />

Gambar 9.24.<br />

V RES = V AG + V BG + V CG = 3Vo<br />

635

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