BAB I A. Fung Fungsi si Pen Pentan tanaha ahan n
Definisi grounding adalah sistem pentanahan yang berfungsi untuk meniadakan beda potensial sehingga jika ada kebocoran tegangan atau arus akan langsung dibuang ke b umi. Fungsi grounding : 1. Perlin Perlindun dungan gan dari dari tegan tegangan gan tinggi tinggi Grounding dalam sistem instalasi listrik berungsi untuk mengurangi atau menghindari bahaya yang disebabkan oleh tegangan tinggi.misalnya bahaya baha ya petir dengan d engan tegangan tinggi 2. Pens Pensta tabi bill tega tegang ngan an Grou Groundi nding ng dapat dapat berf berfung ungsi si untuk untuk mens mensta tabi bilk lkan an tegan teganga gan n pada pada bany banyak ak sumb sumber er tegangan. tegangan. Jika tidak terdapat titik titik referensi referensi umum untuk semua sumber sumber tegangan akan terjadi kesulitan antar masing!masing hubungan ". #eng #engat atas asii arus arus yang yang leb lebih ih Grounding juga berfungs untuk mengatasi arus yan g berlebih karena sistem grounding ini menyediakan le$el keselamatan baik kerusakan peralatan atau manusia. %istem grounding berfungsi sebagai sarana mengalirkan arus petir yang menyebar ke segala arah ke dalam tanah. &al yang perlu diperhatikan dalam perancangan sistem pentanahan adalah tidak timbulnya bahaya tegangan step dan tegangan sentuh. 'riteria yang dituju dalam pembuatan sistem pentanahan pentanahan adalah bukannya rendahnya harga tahanan tanah akan tetapi dapat dihindarinya bahaya seperti tersebut di depan. %elain %elain itu itu kondisi kondisi tanah yang yang bagus bagus untuk untuk groundi grounding ng adalah adalah tanah tanah yang basah. Groundi Grounding ng untuk untuk menyalur menyalurkan kan arus arus listri listrik k imbas imbas dari dari peralat peralatan an elektr elektroni onik k yang yang anda lindungi dapat dibuat dengan cara membor tanah di tepi kantor anda sampai kedalaman ditemukannya air. #asukanlah pipa ledeng ke dalam lubang tersebut. Dalam mengerjakan pemboran tanah mintalah bantuan kepada tukang pembuat sumur bor yang memiliki
%(%)*# P*#+,#(-
1
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perangkat bor tanah yang lengkap.Pasanglah len gkap.Pasanglah kabel tembaga khusus kh usus ground dengan dibagian ujungnya dipasang terlebih dahulu batang tembaga sepanjang kurang lebih 1 ! 1/ meter. #asukan batang tembaga kedalam lubang sampai dasar lubang. %isa kabel tembaga yang masih tampak di bagian ujung lubang di permukaan tanah segera dihubungkan dengan kabel ground yang berasal dari ruang kerja anda. -gar ujung kabel ground t ersebut tidak goyang ada baiknya ujung lubang ground tersebut ditutup dengan semen sehingga hanya tampak ujung kabel tembaga saja diatasnya.
SYARAT – SYARAT SISTEM PENTANAHAN YANG EFEKTIF
1. )ahana )ahanan n pentan pentanahan ahan harus harus memenuhi memenuhi syarat syarat yang yang di inginkan inginkan untuk suatu suatu keperl keperluan uan pemakaian 2. *lektr *lektroda oda yang yang ditan ditanam am dalam dalam tanah tanah harus harus : a. +aha +ahan n 'ond 'onduk ukto torr yang yang baik baik b. )ahan )ahan 'orosi c. 0ukup 'uat ". *lektroda *lektroda harus harus mempunyai mempunyai kontak kontak yang yang baik dengan dengan tanah tanah sekelili sekelilingnya. ngnya. . )ahana )ahanan n pentanah pentanahan an harus harus baik untuk untuk berbaga berbagaii musim musim dalam dalam setahun. +iaya pemasangan serendah mungkin.
SIFAT DAN JENIS-JENIS TANAH
Tahanan Jenis Tanah (!
Dari Dari rumus rumus untuk untuk menentu menentukan kan tahana tahanan n tanah tanah dari dari statu statu elektr elektroda oda yang yang hemisp hemispher herica icall 3 4526r 4526r terlih terlihat at bah7a bah7a tahana tahanan n pentan pentanahan ahan berband berbanding ing lurus lurus
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sifat geologi tanah
'omposisi 8at kimia dalam tanah
'andungan air tanah
)emperatur tanah )emperatur %elain itu faktor perubahan musim juga mempengaruhin ya.
B. Siste" Siste" PHB PHB (Pa#an (Pa#an Hu$ Hu$ung ung Bagi Bagi !
Panel hubung bagian adalah peralatan peralatan yang berfungsi berfungsi menerima menerima energi listrik listrik dari P9 dan selanj selanjutny utnyaa mendis mendistri tribus busika ikan n dan sekali sekaligus gus mengont mengontrol rol penyalu penyaluran ran energy energy listri listrik k tersebut melalui sirkit sirkit panel utama dan cabang ke P&+ cabang atau langsung melalui sirkit akhir kebeban yang berupa beberapa titik lampu dan melalui kotak!kontak keperalatan pemanfaatan listrik yang berada di dalam bangunan
Gambar 1.1 PHB (Papan Hubung Hub ung Bagi) Gardu Portal %. Pe&anan Pe&anan Pane' Pane' Hu$u Hu$ungBa ngBagi gi (PHB! (PHB! Da'a" Da'a" Suatu Suatu Banguna Bangunan n Penghubung
Panel berfungsi untuk menghubungkan antara satu rangkaian listrik dengan rangkaian listrik lainnya pada suatu operasi kerja. Pengaman %uatu panel akan bekerja secara secara otomatis melepas melepas sumber atau suplay tenaga listrik listrik
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Panel membagi kelompok beban baik pada instalasi penerangan maupun pada instalasi tenaga. Penyuplai Panel menyuplai menyuplai tenaga tenaga listr listrik ik dari dari sumber sumber kebeban .Panel sebagai sebagai penyuplai penyuplai dan mendistribusikan tenaga listrik listrik dari panel utama panel cabang sampai kepusat beban baik untuk instalasi penerangan maupun instalasit enaga. Pengontrol Fungsi panel sebagai sebagai pengontrol pengontrol merupakan merupakan fungsi paling utama utama karena dari panel ters terseb ebu u tmas tmasin ing! g!ma masi sing ng rang rangka kaia ian n beba beban n dapat dapat diko dikont ntro rol. l.
%elur %eluruh uh beban beban pada pada
bangunan baik instalasi penerangan peneranga n maupu ninstalasi tenaga dapat dikontrol dari satu tempat. . Pe"$ Pe"$u" u"ia ian n PHB PHB TR
Digambarkan sebagai suatu pelaksanaan koneksi dengan mana suatu peralatan atau sirkit di hubungkan pada bumi. 'oneksi yang digunakan untuk menetapkan dan memelih arah potensi dari bumi atau kira!kira kira!kira potensi potensi itu pada peralatan atau sirkit yang di hubungkan. %uatu pentanahan terdiri dari suatu konduktor pentanahan suatu elektroda pentanahan suatu konnektor pentanahan yang menyentuh konduktor yang Pentanahan pada elektroda tanah dan soil dalam hubungan dengan elektroda tanah.
Gambar 1.2 Jenis Elektroda Pentanahan )): netral sumber daya terhubung ke bumi dan frame peralatan beban terhubung ke
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): netral sumber daya terhubung ke bumi dan frame peralatan beban terhubung ke
sumber daya yang sudah terhubung ke bumi )!%: ketika fungsi proteksi disediakan oleh konduktor yang terpisah dengan netral
sumber daya. )!0: ketika ketika fungsi fungsi netral netral dan protek proteksi si digabu digabungka ngkan n dalam dalam sebuah sebuah kondukt konduktor or )!0: tunggal Pentan Pentanahan ahan system system teganga tegangan n rendah rendah terdir terdirii atas atas : penghant penghantar ar tanah tanah elektro elektroda da pentanahan macam!macam pentanahan dan cara pemilihan system pentanahan. Pada %P)9 %P)9 dan trans transfor format mator or daya daya yang yang mencat mencatu u penggun penggunaa tenaga tenaga listr listrik ik dengan dengan rating rating tega tegang ngan an kura kurang ng dari dari 1 k;
Gambar 1.3 Skema Pentanahan Pada egangan egangan !endah
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'abel grounding secar secaraa umum umum terk terkon onek eksi si di k>h k>h mete meterr P9. P9. Pada Pada saat saat pemasangan k>h meter petugas P9 yang melakukan pemasangan instalasi grounding dan dan juga juga menyamb menyambun ung g kabel kabel grounding di dalam k>h meter tersebut. Dalam Dalam hal ini petugas petugas P9 akan akan memast memastika ikan n grounding terpasang terpasang dengan benar. benar. 'arena k>h meter adalah milik P9 dan disegel. )etapi tapi seri sering ng juga juga peru peruma maha han n yang yang diba dibangu ngun n mema memasa sang ng send sendir irii inst instal alas asii grounding dengan dengan menggu menggunaka nakan n jasa jasa kontrak kontraktor tor instal instalasi asi listr listrik ik sebelu sebelum m P9 memasang k>h meter!nya. Dan kemudian saat k>h meter dipasang petugas P9 akan menyambung koneksi grounding koneksi grounding tersebut tersebut di k>h meter. ,ntuk sistem koneksi grounding di k>h meter meter termin terminal al groundi grounding ng akan akan dihubun dihubungkan gkan dengan dengan termin terminal al netr netral al.. %ist %istem em grounding di k>h meter meter akan akan disamb disambung ungkan kan menggun menggunakan akan kabel kabel grounding grounding dari kabel ?# masuk ke #0+ +o@. (nstalasi (nstalasi grounding grounding di bagian luar atau Aoutdoor Aoutdoor . . ,ntuk tipe yang umum atau kon$ensional bisa dilihat pada gambar berikut :
Gambar 1." #nstalasi Grounding Pada !umah
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%istem grounding %istem grounding yang yang terpasang ada dua macam yaitu untuk instalasi listrik rumah dan instalasi penangkal petir. Dua system grounding system grounding ini ini memang harus dipisahkan pemasangannya dan berjarak paling tidak 1C m.
'oneksi grounding 'oneksi grounding untuk untuk instalasi listrik rumah terpasang di k>h meter P9.
K+"#+nen insta'asi groundi insta'asi grounding ng a,a'ah a,a'ah se$agai $e&iut 0
Grounding rod yaitu batang grounding batang grounding yang yang ditanam di dalam tanah. )erdiri dari Grounding pipa gal$anis ga l$anis medium ka7at tembaga +0 berdiamater 1B mm2 Dan dilengkapi deng dengan an A split$en split$en yang yang diken dikenca cang ngkan kan denga dengan n baut. baut. Panj Panjan ang g grou groundi nding ng rod rod ini ini biasanya antara 1./ m s5d " m. Pipa P;0 yang digunakan sebagai selubung
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. %ebu %ebutk tkan an Pera Peran n P&+ P&+ E H. Gambar Gambarkan kan %kema %kema Pentanah Pentanahan an Pada )eg )egang angan an endah endah E 1C. %ebutkan Dan Jelaskan 'omponen (sntalasi Grounding E
BAB II A. GARD2 DISTRIB2SI DISTRIB2SI 3 GARD2 GARD2 META META 4AD
Gard Gardu u Dist Distri ribu busi si adal adalah ah bagi bagian an dari dari sist sistem em jari jaring ngan an dist distri ribus busii yang yang meru merupak pakan an penghubung antara sistem saluran distribusi primer dengan sistem saluran distribusi
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Gambar 2.1 Gardu %istribusi
-dapun beberapa fungsi gardu distribusi d istribusi adalah sebagai berikut : 1. #enyalu #enyalurka rkan5 n5 menerusk meneruskan an tenaga tenaga listrik listrik tegangan tegangan menengah menengah ke konsume konsumen n tegang tegangan an rendah. 2. #enur #enurunk unkan an tega teganga ngan n mene menenga ngah h menj menjad adii tegan teganga gan n renda rendah h sela selanju njutny tnyaa disa disalu lurk rkan an kekonsumen tegangan rendah. ". #enyalurkan5 #enyalurkan5 menerus meneruskan kan tenaga listri listrik k tegangan tegangan menengah ke gardu gardu distribusi distribusi lainnya lainnya dan ke gardu hubung. )ransformator distribusi digunakan untuk menurunkan tegangan listrik dari jaringan distri distribus busii teganga tegangan n tinggi tinggi menjad menjadii teganga tegangan n terpaka terpakaii pada pada jaring jaringan an distri distribus busii teganga tegangan n rendah
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%ebagian besar pada jaringan distribusi tegangan tinggi
%. Ga&, Ga&,u u Ki+ Ki+ss (Ga (Ga&, &,u u Bes Besi! i!
Gardu kios adalah gardu yang bangunan keseluruhannya terbuat dari plat besi dengan konstruksi seperti kios. Gardu kios merupakan merupakan Gardu Distribusi Distribusi yang pembangunanny pembangunannyaa bisanya bersifat bersifat untuk sementara saja selama ada rehabilitasi gardu. +angunannya terdiri dari rangka besi dan dindingnya dari %eng serta lantainya biasanya terbuat dari kayu atau beton. uangan pada gardu ini terdiri dari " bagian yaitu : a= uang uangan an )ega )egang ngan an #enen #enenga gah h b= uang )rafo c= uang uang )eganga gangan n enda endah h
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Gambar 2." Gardu #etal 0lab
. Suste" Pe"$u"ian
a! Insta Insta'as 'asii Pe"$u Pe"$u"ia "ian n
(nst (nstal alas asii pemb pembum umia ian n pada pada gard gardu u berd berdas asar arkan kan kete ketent ntua uan n yang yang dibe diberl rlak akuk ukan an setempat. )ujuan utamanya adalah mendapatkan nilai pentanahan elektroda maksimum 1 Mhm.
Gambar 2. *lektrode Pentanahan
0ontoh kasus yang dapat kita lihat yaitu pada (nstalasi pembumian di P). P9 Distribusi Jakarta aya N )angerang kabel 1 @ /C mm 0u digelar diba7ah fondasi melingkar tertutup. Pada beberapa titik tiap!tiap 1 meter dikeluarkan sebagai terminal pembumian. 'abel ini berfungsi juga sebagai ikatan penyama pe nyama potensial. Penggunaan elektroda batang pada gardu distribusi: a= #emakai #emakai elekt elektrod rodaa dengan dengan kedalama kedalaman n "!B meter. meter.
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b= )itik netral sistem tegangan rendah pada terminal netral transformator pada ak P+!) dibumikan dihubungkan pada elektroda pembumian. c= 'lem pengikat pengikat harus harus terbuat terbuat dari dari bahan tahan tahan korosi korosi minimal minimal memakai memakai baut ukuran ukuran 1C mm.
O Gambar 2./ Diagram (nstalasi Pembumian Gardu Distribusi
Kete&angan
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Fisser ukuran 1C mm2 panjang BC mm2 12C mm2 (nsulating bolt baut dilapisi nilon makrolon. (nsulating slim bahan bakelit nilon makrolon.
)erminal hubung plat diba7ah d iba7ah sel )#. )erminal 0lampping connector C H mm2 1" mm2 1 mm2. )! connector lunimog!clamp terbuat dari 0u. -ngle clamp connector
,ntuk konstruksi pemasangan contoh pada standard konstruksi instalasi gardu P). P9
ATIHAN Jawablah Jawablah dengan baik baik dan benar benar
1. -pa yang yang dimaks dimaksud ud Gard Gardu u Distr Distribu ibusi si E
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BAB III A. Ga&, Ga&,u u Batu Batu3B 3Bet+ et+n n
?aitu gardu distribusi yang bangunan pelindungnya terbuat dari beton
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Gambar 3.2 ra'o ra'o 0ara mudah membedakanya yaiu Gardu ini lebih cendrung seperti bangunan sipil dan dan memil memilik ikii &ala &alama man n cuku cukup p luas luas.Pe .Peng ngam aman an dari dari pengg pengguna una tenag tenagaa list listri rik k ini ini ada ada bermacam!macam dan salah satunya adalah dengan pentanahan peralatan guna melindungi melindungi bahaya arus listrik listrik terhadap terhadap manusia manusia peralatan peralatan dan bangunan. bangunan. %esuai dengan namaya maka gardu ini bangunannya terbuat dari beton. )ype dari bangunan ini bermacam Q macam maca m sesuai dengan lokasi dan kebutuhan. 'apasitas transformator yang yan g dipasng pada gardu ini dapat lebih besar dibandingkan dengan gardu Q gardu yang sebelumnya yang sudah dijelaskan.
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)rafo
ak )egangan endah
Dan lain Q lain
B. S#e S#esi5i si5iasi asi Pa,a Pa,a Ga&, Ga&,u u Batu Batu (Bet+n! (Bet+n!
%. S*ste" S*ste" #e&a' #e&a'atan atan Yang ,igun ,igunaa aan n
a= ak ak ) ) unuk unuk jur jurus usan an +erf +erfun ungs gsii untuk untuk sete setela lah h tega teganga ngan n samp sampai ai ke rak rak ) sela selanj njut utny nyaa tega tegang ngan an didistribusikan dengan melalui jurusan Q jurusan yang sudah terbagi Q bagi pada jurusan ini ada sebanyak buah < namun ada juga yang sampai jurusan =. b= Penyekat 5 batas untuk rak trafo
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. T& T&ans5+& ans5+&"at+& "at+& *ang ,igunaan ,igunaan #a,a #a,a ga&,u ga&,u $atu $atu ($et+n! ($et+n!
a= )ran )ransf sform ormat ator or tegan tegangan gan )ransfor )ransformator mator tegangan berfungsi untuk menurunkan menurunkan tegangan tegangan tinggi tinggi 5 menegah menjadi tegangan rendah untuk besaran ukur sesuai dengan alat Q alat ukur. b= )ransformator arus )ransformator arus berfungsi untuk menurunkan arus besar pada tegangan tinggi 5 menegah menjadi menjadi arus kecil pada tegangan rendah untuk besaran besaran ukur sesuai alat Q alat ukur.
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Bagian ua& Da&i T&ans5+&"at+& )angki trafo
+erfun +erfungsi gsi untuk untuk menampu menampung ng minyak minyak trafo trafo dan tempat tempat dudukan dudukan inti inti trafo trafo dan kumparannya. %irip pendingin trafo
+erfungsi sebagai pendingin bagi minyak trafo dalam keadaan bekerja. 'onse$ator
,ntuk menampung pemuaian dan pendingin minyak trafo dalam keadaan bekerja.
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,ntuk mempermudah pemindahan trafo dari suatu tempat ke tempat lain yang dapat berputar "BC derajat. 'ran pembuangan
,ntuk mengambil sample minyak trafo pada 7aktu pengetesan 'uping pengangkat
,ntuk tempat mencengkram atau menggantungkan trafo apabila akan diangkat.
Bagian Da'a" Da&i T&ans5+&"at+& (nti +esi
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Gambar 3.3 #nti Besi 'umparan )ersier
%elain kedua kumparan < primer dan sekunder = ada beberapa trafo yang dilengkapi dengan kumparan ketiga atau kumparan tersier < tertiary 7inding =. 'umparan tersier diperlukan untuk memperoleh tegangan tersier atau untuk kebutuhan lain. ,ntuk kedua keperluan tersebut kumparan tersier tersier selalu dihubungkan dihubungkan delta. 'umparan 'umparan tersie tersierr sering sering diperg dipergunak unakan an juga juga untuk untuk penyambu penyambungan ngan perala peralatan tan bantu bantu sepert sepertii kondensator synchrone kapasitor shunt dan reactor shunt namun demikian tidak semua trafo daya mempunyai kumparan tersier.
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S1A ATIHAN ) JA7ABAH DENGAN BAIK DAN BENAR %. . ). 6. /. B. . .
-pa yang di maksud Gardu +atu5+eton E -lat apa saja yang terdapat pada gardu beton E Gambarkan bagan satu garis Gardu beton E +agaimana cara pembumian pada gardu beton E %ebutka %ebutkan n kapasit kapasitas as yang yang paling paling besar besar untuk untuk gardu gardu E -pa perbedaan perbedaan bagunan gardu beton yang lama lama dan dan yang yang baru baru E -pa saja saja perlen perlengka gkapan pan pada pada gard gardu u beton beton E %ebutkan %ebutkan dan jelaskan jelaskan %istem %istem peralat peralatan an yang digunakan digunakan pada pada gardu gardu batu E
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konsum konsumen. en. #engin #engingat gat fungsi fungsi dan harga harga trafo trafo terseb tersebut ut cukup cukup mahal mahal bila bila dibandi dibandingka ngkan n dengan peralatan distribusi lainnya maka pemeliharaan pre$entif yang dilakukan secara intensif dengan kriteria pemeliharaan yang jelas untuk setiap komponen G)) dan ditangani
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Arrester Arrester : sebagai pengaman trafo terhadap tegangan lebih yang disebabkan oleh
sambaran petir dan s7itching <%P9 se.C225P)%5"= NH Fuse : sebagai pengaman trafo terhadap arus lebih yang terpasang pada sisi
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$. 42T 12T
0ut Mut berfungsi untuk opersai dan sebagai unit trafo cara kerjanya sebagai berikut:
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