DAFTAR ISI HALAMAN JUDUL ............................................................................................... i LEMBAR PENGESAHAN .................................................................................... ii PERNYATAAN .................................................................................................... iii MOTTO ................................................................................................................. iv PERSEMBAHAN ................................................................................................... v PRAKATA ............................................................................................................ vi DAFTAR ISI ....................................................................................................... viii DAFTAR GAMBAR .............................................................................................. x DAFTAR TABEL ................................................................................................ xii DAFTAR PERSAMAAN .................................................................................... xiii ABSTRACT ........................................................................................................ xiv INTISARI ............................................................................................................. xv BAB I PENDAHULUAN A. Latar Belakang ............................................................................................... 1 B. Maksud dan Tujuan ....................................................................................... 2 C. Batasan Masalah ............................................................................................ 2 D. Metode Pengumpulan Data ............................................................................ 2 E. Sistematika Penulisan Laporan ...................................................................... 3 BAB II DASAR TEORI A. Proteksi Transmisi Tenaga Listrik ................................................................. 5 B. Tujuan Sistem Proteksi .................................................................................. 6 C. Persyaratan Sistem Proteksi ........................................................................... 6 D. Pemutus Tenaga (PMT) ................................................................................. 9 E. Transformator Arus (CT) ............................................................................. 10 F. Trafo Tegangan (PT) ................................................................................... 12 G. Relay Arus Lebih (OCR) ............................................................................. 12 H. Relay Hubung Tanah (GFR) ........................................................................ 17
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BAB III METODE PELAKSANAAN A. Arus Hubung Singkat (short circuit) ............................................................ 20 B. Data GIS PLTU Adipala .............................................................................. 20 C. Data Main Transformator ............................................................................ 21 D. Data Circuit Breaker (PMT) ........................................................................ 22 E. Data Transformator Tegangan (PT) ............................................................. 23 F. Data Transformator Arus (CT) .................................................................... 23 G. Data Busbar ................................................................................................. 24 H. Data Relay ................................................................................................... 25 I. Data Kabel Transmisi .................................................................................. 26 J. Single Line Diagram GIS PLTU Adipala .................................................... 27 K. Metode Penentuan Pemakaian Relay OCR dan Relay GFR ........................ 28 BAB IV ANALISA DAN PEMBAHASAN A. Setting Main Transformator ........................................................................ 30 B. Setting Busbar ............................................................................................. 31 C. Setting Circuit Breaker ................................................................................ 31 D. Setting Trafo Arus (CT) ............................................................................... 32 E. Setting Trafo Tegangan (PT) ....................................................................... 33 F. Perhitungan Setting Relay Arus Lebih (OCR) ............................................. 33 G. Perhitungan Setting Relay Hubung Tanah (GFR) ....................................... 49 H. Analisa Data ................................................................................................ 63 BAB V PENUTUP A. Kesimpulan ................................................................................................. 71 B. Saran ............................................................................................................ 71 DAFTAR PUSTAKA ........................................................................................... 72 LAMPIRAN ......................................................................................................... 73
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DAFTAR GAMBAR Gambar 2.1
Pemutus Tenaga (Circuit Breaker) ................................................ 10
Gambar 2.2
Cara Kerja Trafo Arus ................................................................... 11
Gambar 2.3
Trafo Arus (CT) ............................................................................. 11
Gambar 2.4
Trafo Tegangan (PT) ..................................................................... 12
Gambar 2.5
Karakteristik Relay Waktu Seketika (Instantaneous Relay) .......... 13
Gambar 2.6
Karakteristik Relay Waktu Tertentu (Definite Relay) .................... 14
Gambar 2.7
Karakteristik Relay Waktu Terbalik (Inverse) ............................... 15
Gambar 2.8
Prinsip Kerja Relay OCR .............................................................. 16
Gambar 2.9
Karakteristik Relay Arus Lebih ..................................................... 17
Gambar 2.10 Rangkaian Pengawatan Relay GFR ............................................... 18 Gambar 3.1
Singe Line Diagram GIS PLTU Adipala ........................................ 27
Gambar 3.2
Metode Penentuan Pemakaian Relay Arus Lebih ......................... 28
Gambar 4.1
Setting Main Transformator GIS Adipala ..................................... 30
Gambar 4.2
Setting Busbar GIS Adipala .......................................................... 31
Gambar 4.3
Setting Circuit Breaker GIS Adipala ............................................ 32
Gambar 4.4
Setting Trafo Arus (CT) GIS Adipala ........................................... 32
Gambar 4.5
Setting Trafo Tegangan (PT) GIS Adipala .................................... 33
Gambar 4.6
Setting Relay OCR Tipe Definite Time ........................................ 35
Gambar 4.7
Hasil Grafik Simulasi Relay OCR Tipe Definite Time.................. 36
Gambar 4.8
Setting Relay OCR Tipe Normal Inverse ...................................... 38
Gambar 4.9
Hasil Grafik Simulasi Relay OCR Tipe Normal Time .................. 39
Gambar 4.10 Setting Relay OCR Tipe Very Inverse .......................................... 42 Gambar 4.11 Hasil Grafik Simulasi Relay OCR Tipe Very Time ...................... 42 Gambar 4.12 Setting Relay OCR Tipe Extremely Time ..................................... 45 Gambar 4.13 Hasil Grafik Simulasi Relay OCR Tipe Extremely Time ............. 45 Gambar 4.14 Setting Relay OCR Long Time Inverse ......................................... 48 Gambar 4.15 Hasil Grafik Simulasi Relay OCR Tipe Long Time Inverse ......... 49 Gambar 4.16 Setting Relay GFR Tipe Definite Time ......................................... 51 Gambar 4.17 Hasil Grafik Simulasi Relay GFR Tipe Definite Time ................. 52
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Gambar 4.18 Setting Relay GFR Tipe Normal Inverse ....................................... 54 Gambar 4.19 Hasil Grafik Simulasi Relay GFR Tipe Normal Inverse ............... 54 Gambar 4.20 Setting Relay GFR Tipe Very Inverse ........................................... 56 Gambar 4.21 Hasil Grafik Simulasi Relay GFR Tipe Very Inverse ................... 57 Gambar 4.22 Setting Relay GFR Tipe Extremely Inverse .................................. 59 Gambar 4.23 Hasil Grafik Simulasi Relay GFR Tipe Extremely Inverse ........... 60 Gambar 4.24 Setting Relay GFR Tipe Long Time Inverse ................................. 62 Gambar 4.25 Hasil Grafik Simulasi Relay GFR Tipe Long Time Inverse .......... 63 Gambar 4.26 Single Line Diagram Simulasi Relay Arus Lebih .......................... 65 Gambar 4.27 Perbandingan Kurva Relay Arus Lebih (OCR) ............................. 67 Gambar 4.28 Perbandingan Kurva Relay Hubung Tanah (GFR) ........................ 68
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DAFTAR TABEL Tabel 3.1 Data GIS PLTU Adipala .................................................................... 21 Tabel 3.2 Data Circuit Breaker GIS PLTU Adipala ........................................... 22 Tabel 3.3 Data Trafo Tegangan (PT) GIS PLTU Adipala ................................. 23 Tabel 3.4 Data Trafo Arus (CT) GIS PLTU Adipala .......................................... 24 Tabel 3.5 Data Busbar GIS PLTU Adipala ........................................................ 25 Tabel 3.6 Data Relay Siemens 7SG11 ................................................................ 25 Tabel 3.6 Data Kabel Transmisi GIS PLTU Adipala ......................................... 27 Tabel 3.7 Impedansi Saluran Transmisi GIS PLTU Adipala ............................. 27 Tabel 4.1 Hasil Perhitungan Setting Relay OCR ................................................ 63 Tabel 4.2 Hasil Perhitungan Setting Relay GFR ................................................ 64 Tabel 4.3 Perbandingan Waktu Trip Relay Arus Lebih (OCR) ......................... 65 Tabel 4.4 Perbandingan Waktu Trip Relay Hubung Tanah (GFR) .................... 66 Tabel 4.5 Data Setting Relay Differensial NARI 931 ........................................ 69 Tabel 4.6 Data Setting Relay Siemens 7SG11 .................................................... 70
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DAFTAR PERSAMAAN Persamaan 2.1
Arus Nominal (OCR) ................................................................ 16
Persamaan 2.2
Arus Kerja Relay Sisi Primer (OCR) ........................................ 16
Persamaan 2.3
Arus Kerja Relay Sisi Sekunder (OCR) .................................... 16
Persamaan 2.4
Waktu Kerja Relay (OCR) ........................................................ 16
Persamaan 2.5
Arus Kerja Relay Sisi Primer (GFR) ......................................... 18
Persamaan 2.6
Arus Kerja Relay Sisi Sekunder (GFR) .................................... 19
Persamaan 2.7
Waktu Kerja Relay (GFR) ......................................................... 19
Persamaan 2.8
Arus Gangguan Trafo ............................................................... 19
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