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DAFTAR ISI

Halaman

HALAMAN JUDUL .............................................................................................. i

HALAMAN PENGESAHAN ............................................................................... ii

LEMBAR PENGESAHAN ................................................................................. iii

KATA PENGANTAR .......................................................................................... iv

DAFTAR ISI ........................................................................................................ vi

DAFTAR GAMBAR .............................................................................................. x

DAFTAR TABEL ............................................................................................... xii

BAB I PENDAHULUAN

1.1 Tema Judul dan Batasannya ....................................................................... 1

1.2 Latar Belakang Pemilihan Tema Judul ..................................................... 1

1.3 Tujuan Kerja Praktik .................................................................................. 2

1.4 Tempat, Waktu dan Bidang Kegiatan Perusahaan Tempat Kerja Praktik . 2

1.5 Metode Pengumpulan Data ........................................................................ 3

1.6 Sistematika Penulisan ................................................................................ 3

BAB II PT. INDONESIA POWER UBP SURALAYA

2.1 Sejarah Singkat PT.PLN (Persero) ............................................................ 5

2.2 Logo PT.PLN (Persero) ............................................................................. 6

2.3 Usaha Pokok PT. PLN (Persero) P3B ....................................................... 6

2.4 Visi dan Misi PT.PLN (Persero) ................................................................ 7

2.4.1 Visi Perusahaan ................................................................................. 7

2.4.2 Misi Perusahaan ................................................................................ 8

2.5 Tujuan Perusahaan ..................................................................................... 8

2.6 Tata Nilai ................................................................................................... 8

2.7 Sumber Daya .............................................................................................. 8

2.8 Produksi Perusahaan .................................................................................. 9

2.9 Tugas Organsasi dan Ruang Lingkup Usaha Pokok PT.PLN (Persero)

P3B ............................................................................................................. 9

2.9.1 Fungsi Dan Tugas Organisasi PT. PLN (Persero) P3B....................9

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2.9.2 Ruang Lingkup Usaha Pokok PT. PLN ( persero ) P3B.................9

2.10 Peran dan Tugas PLN APP (Area Pemeliharaan Dan

Penyaluran)....................................................................................10

2.10.1 Peran PLN APP......................................................................10

2.10.2 Tugas PLN APP.....................................................................10

2.11 Wilayah kerja PT. PLN (Persero) P3B Jawa-Bali APP

Cilegon...............................................................................................11

2.12 Dampak Lingkungan..........................................................................12

2.13 Personalia dan Fasilitas PT. PLN (Persero) APP Cilegon....................12

2.14 Struktur Organisasi di PT. PLN (Persero) P3B.....................................13

BAB III TEORI DASAR

3.1 Gardu Induk ........................................................................................... 14

3.1.1 Definisi Umum .......................................................................... 14

3.2 Klasifikasi Gardu Induk. ....................................................................... 14

3.2.1 Menurut Lokasi dan Fungsi ....................................................... 14

3.2.2 Menurut Penempatan Peralatannya ........................................... 14

3.2.3 Menurut Isolasi yang Digunakan ............................................... 15

3.2.4 Menurut Sistem Rel (Busbar) .................................................... 16

3.3 Peralatan Perlengkapan Gardu Induk .................................................... 18

3.3.1 Transformator Daya ................................................................... 18

3.3.2 Transformator Tegangan ........................................................... 18

3.3.3 Transformator Arus ................................................................... 19

3.3.4 Transformator Bantu (Auxilliary Transformator) .................... 19

3.3.5 Aresster ...................................................................................... 20

3.3.6 Busbar/rel ................................................................................... 20

3.3.7 Saklar Pemisah (PMS) atau Disconnecting Switch (DS) ........... 20

3.3.8 Pemutus Tenaga (PMT) atau Circuit Breaker (CB) .................. 21

3.3.9 Sakelar Pentanahan .................................................................... 21

3.3.10 Kompensator .............................................................................. 22

3.3.11 Rele Proteksi dan Papan Alarm ................................................. 22

3.3.12 Baterai ........................................................................................ 22

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3.4 Bagian-Bagian dari Transformator Daya .............................................. 23

3.4.1 Bagian Utama ............................................................................ 23

3.4.1.1 Inti Besi........................................................................ 23

3.4.1.2 Kumparan Transformator ............................................ 24

3.4.1.3 Minyak Transformator ................................................. 24

3.4.1.4 Tangki Konservator ..................................................... 25

3.4.1.5 Bushing ........................................................................ 26

3.4.2 Bagian Peralatan Bantu Transformator ..................................... 26

3.4.2.1 Pendingin Transformator ............................................. 26

3.4.2.2 Tap Changer ................................................................ 27

3.4.2.3 Alat Pernafasan ............................................................ 27

3.4.2.4 Indikator....................................................................... 28

3.5 Peralatan Proteksi Pada Transformator ................................................. 29

3.6 Uraian Kegiatan Pemeliharaan Transformator ...................................... 31

BAB IV ANALISA DAN PEMBAHASAN

4.1 Pemeliharaan Trannsformator Daya ...................................................... 37

4.1.1 Tujuan Pemeliharaan ................................................................. 37

4.1.2 Jenis-Jenis Pemeliharaan ........................................................... 38

4.2 Analisa Hasil Pemeliharaan Transformator Daya pada GI 150 KV

Menes .................................................................................................... 39

4.2.1 Pengujian Tegangan Tembus Minyak ....................................... 39

4.2.1.1 Elektroda ...................................................................... 40

4.2.1.2 Pelaksanaan Pengujian Tegangan Tembus Minyak .... 42

4.2.2 Pengukuran Tahanan Isolasi Belitan Transformator ................. 44

4.2.2.1 Persiapan Pengujian Tahanan Isolasi Belitan

Transformator .............................................................. 45

4.2.2.2 Tahap Pelaksanaan Pengujian Tahanan Isolasi Belitan

Transformator .............................................................. 46

4.2.2.3 Tahap Akhir Pengujian Tahanan Isolasi Belitan

Transformator .............................................................. 46

4.2.3 Pengujian Tangen Delta ............................................................. 49

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4.2.3.1 Tahap Persiapan Pengujian Tangen Delta ................... 51

4.2.3.2 Tahap Pelaksanaan Pengujian Tangen Delta ............... 52

4.2.3.3 Tahap Akhir Pengujian Tangen Delta ......................... 54

BAB V PENUTUP

5.1 Kesimpulan .............................................................................................. 57

5.2 Saran ........................................................................................................ 57

DAFTAR PUSTAKA

LAMPIRAN

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DAFTAR GAMBAR

Halaman

2.1 Logo PT. PLN (Persero) .................................................................................. 6

2.2 Wilayah Kerja PT. PLN (Persero) P3B Jawa-Bali APP Cilegon ................. 12

2.3 Bagan Organisasi P3B JAWA BALI ............................................................. 13

3.1 Gardu Induk Konvensional ............................................................................ 15

3.2 Single Line Diagram Gardu Induk Single Line Busbar ................................. 16

3.3 Single Line Diagram Gardu Induk Sistem Double Busbar ............................ 17

3.4 Single Line Diagram Gardu Induk Satu Setengah Busbar ............................. 17

3.5 Transformator Daya ....................................................................................... 18

3.6 Transformator Tegangan ................................................................................ 19

3.7 Transformator Arus........................................................................................ 19

3.8 Arrester........................................................................................................... 20

3.9 Pemutus Tenaga ............................................................................................. 21

3.10 Inti Besi .......................................................................................................... 23

3.11 Susunan Kumparan Dari Transformator ........................................................ 24

3.12 Tangki Konservator........................................................................................ 25

3.13 Bushing........................................................................................................... 26

3.14 Pendingin Kipas-Kipas Radiator .................................................................... 27

3.15 Alat Pernafasan Transformator ...................................................................... 28

3.16 Indikator Winding Temperature ..................................................................... 29

4.1 Elektroda Setengah Bola ................................................................................ 40

4.2 Elektroda Jarum ............................................................................................. 40

4.3 Elektroda Bidang............................................................................................ 41

4.4 Diagram Alir Pengujian Tegangan Tembus Minyak ..................................... 41

4.5 Alat Uji Tegangan Tembus Minyak ............................................................... 42

4.6 Rangkaian Pengujian Tegangan Tembus Minyak ......................................... 43

4.7 Alat Ukur Tahanan Isolasi ............................................................................. 45

4.8 Rangkaian Pengujian Tahanan Isolasi Belitan Trafo ..................................... 47

4.9 Komponen Pada Kapasitor Yang Tidak Sempurna ....................................... 50

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4.10 Diagram Fasor ................................................................................................ 50

4.11 Alat Pengujian Tangen Delta Merk Biddle Tipe Delta 2000 ......................... 51

4.12 Rangkaian Pengujian Tangen Delta ............................................................... 52

4.13 Tampilan Hasil Pengujian Tangen Delta ....................................................... 53

4.14 Data Key, Data Printer dan Thermal Printer .................................................. 54

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DAFTAR TABEL

Halaman

3.1 Kegiatan Pemeliharaan Transformator Tenaga ................................................ 31

4.1 Data Pengujian Tegangan Tembus Minyak ..................................................... 43

4.2 Data Hasil Pengukuran Tahanan Isolasi Transformator ................................. 47

4.3 Standar Indeks Polarisasi ................................................................................. 49

4.4 Data Hasil Pengujian Tangen Delta ................................................................. 54

4.5 Klasifikasi Hasil Uji Tangen Delta .................................................................. 55