LAPORAN PRAKTIKUM KELISTRIKAN PERTANIAN RANGKAIAN KAPASITIF DAN INDUKTIF
Kelompok
: 2 (satu) Shift A2
Hari, Tanggal Praktikum
: Senin, 26 September 2011
Asisten
:1. Diki 2. Bakti Priandi
Anggota
: Bobby A Palem
(240110090033) (240110090033)
Rommy A Mirhadi
(240110090034) (240110090034)
Adinda Nurfadillah
(240110090035) (240110090035)
Ramdhani Pratama H (240110090036) (240110090036) Primayoga Harsana S (240110090037) (240110090037)
LABORATORIUM INSTRUMENTASI DAN ELEKTRONIKA TEKNIK DAN MANAJEMEN INDUSTRI PERTANIAN FAKULTAS TEKNOLOGI INDUSTRI PERTANIAN UNIVERSITAS PADJADJARAN PADJADJARAN JATINANGOR 2011
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DAFTAR ISI
Daftar Isi .......................................... ................................................................ ................................. ........... Bab I Pendahuluan 1.1 LatarBelakang .............................................. ........................................................ .......... 1.2 Tujuan ............................................ .................................................................. ...................... Bab II Tinjauan Pustaka 2.1 Arus bolak-balik (a.c.) dan Voltase Dd 2.2 Harga rms 2.3 Reaktansi ( Reactance) Reactance) 2.4 Reaktansi Induktif 2.5 Reaktansi kapasitif 2.6 Impedansi. Bab III Metodologi Praktikum 3.1 Alat dan Bahan ............................................ ............................................................... ................... 3.2 Prosedur Praktikum ............................................ ........................................................ ............ Bab IV Hasil Bab V Pembahasan 5.1 Bobby A Palem…………………………… 5.2 Rommy A Mirhadi…………………………….. 5.3 Adinda Nurfadillah…………………………………….. 5.4 Ramdhani Pratama H………………………………… 5.5 Primayoga Harsana S……………………………. Bab VI Kesimpulan dan Saran 6.1 Bobby A Palem………………………………………… Palem ………………………………………… 6.2 Rommy A Mirhadi…………………………………………. 6.3 Adinda Nurfadillah………………………………………. Nurfadillah………………………………………. 6.4 Ramdhani Pratama H……………………………………….. 6.5 Primayoga Harsana S…………………………………………………….. Daftar Pustaka
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BAB I PENDAHULUAN
1.1 Latar Belakang
Penggunaan alat-alat kelistrikan dalam industri pertanian sangatlah dibutuhkan, oleh karena itu kita perlu mengetahui jenis serta fungsi dari alatalat kelitrikan tersebut. Kondensator (Capasitor) adalah suatu alat yang dapat menyimpan energi di dalam medan listrik, dengan cara mengumpulkan ketidakseimbangan internal dari muatan listrik. Kondensator kini juga dikenal dikenal sebagai "kapasitor", "kapasitor", namun kata "kondensator" "kondensator" masih dipakai hingga saat ini. Pada aliran arus AC, dimana kaidah penjumlahan tidak bisa secara aljabar, tetapi bardasarkan vektor. Oleh karena itu kita perlu membuktikan bagaimana penjumlahan tegangtan yang terjadi pada arus tersebut. Penggunaan kapasitor pada sebuah rangkaian yang diaplikasikan dengan dengan menggunakan sebuah resistor yang dilakukan pada arus AC merupakan salah satu alternatif untuk mengetahui sifat sebuah alat listrik, dimana pada praktikum kali ini dilakukan untuk menghitung reaktansi kapasitif suatu kapasitor karena adanya perbedaan tegangan dan reaktansi induktif karena adanya perbedaan arus listrik yang mengalir.
1.2 Tujuan
Tujuan praktikum kali ini adalah: a. Menentukan reaktansi suatu kapasitor pada rangkaian kapasitif. b. Menentukan reaktansi suatu induktor pada rangkaian induktif. c. Menentukan impedansi rangkaian kapasitif dan rangkaian induktif. d. Menentukan arus yang mengalir pada rangkaian kapasitif dan rangkaian induktif. e. Mampu menafsirkan diagram dengan menggunakan diagram fasor f. Menentukan daya efektif rangkaian kapasitif dan rangkaian induktif.
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BAB II TINJAUAN PUSTAKA
2.1 Arus bolak-balik (a.c.) dan Voltase
Pada rangkaian searah, dc (direct (direct current ) polaritasnya selalu sama; potensialnya selalu tetap positif pada satu sisi dan negative di sisi lain, dan arus selalu mengalir pada arah yang sama. Sedang pada rangkaian a.c.( alternating circuit ) polaritasnya berbolak-balik dan berosilasi secara cepat. Untuk sistem daya di Indonesia, frekuensi a.c. adalah 50 hertz (Hz) atau 50 siklus per detik, artinya arah voltase dan arus berbolik-balik 50 kali setiap detik Dalam penggunaan a.c. dimungkinkan menaikkan ataupun menurunkan tegangan dengan transformator dengan jaminan keselamatan. Sedangkan d.c. meskipun memungkinkan pengubahan voltase namun memerlukan peralatan yang lebih rumit dan mahal. Osilasi voltase dan arus pada sistem a.c. dimodelkan dalam kurva sinusoidal, artinya secara matematika dideskrepsikan sebagai fungsi trigonometri sin atau cosin. Pada fungsi ini waktu tidak bersatuan detik atau menit tetapi dalam satuan sudut (angle (angle). ).
Gambar. 1. Fungsi sinus f(t) = A sin (ωt) vs sudut/waktu
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Parameter dari fungsi sinusoidal adalah : 1. Amplitudo; harga maksimum atau ketinggian kurva.(total jarak adalah dua kali amplitudo). 2. Frekuensi ; jumlah asilasi total per unit waktu ( bisa pula diterjemahkan sebagai kebalikan frekuensi , yaitu periode) 3. Phase; mengindikasikan starting point dari kurva sinusoid, dengan kata lain sudut phase menspesifikasikan suatu sudut dimana kurva didepan atau dibelakang dari waktu seharusnya mulai, yaitu nol. Phase disimbolkan dengan huruf φ (phi kecil). Frekuensi sebagai fungsi sinusoidal sering disebut sebagai angular frequency (radian/detik). Disimbolkan dengan huruf ω (omega kecil). Misalkan frekuensi 60 Hz , maka : ω = 60 siklus/detik x 2 π radian/siklus = 377 rad/detik Arus bolak-balik sebagai fungsi waktu dapat dituliskan sebagai fungsi sinusoidal : I(t) = Imax (sin ωt + φI) Kuantitas Imax adalh harga maksimumnya atau amplitude arus. Arus akan berosilasi antara harga Imax dan – Imax. waktu dalam detik dikalikan angular frekuensui ω memberikan satuan radian.
Gambar 2. sinusoida arus bolak-balik tanpa penambahan phase
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Gambar 3. sinusoida arus bolak-balik dengan penambahan phase
Sama seperti arus, maka voltase dituliskan sebagai : V(t) = Vmax (sin ωt + φV) Subscripts pada phase menunjukkan bahwa arus dan voltase berbeda phase.
2.2 Harga rms
Harga rms sebenarnya adalah harga rata-rata. Karena kurva sinusoidal terdiri dari positif pada separoh bagian dan negative pada separoh yang lain, maka harga rata-ratanya NOL, untuk itu digunkan rms ( root mean square). square ). rms =
1 2
=
1 2
= 0,707
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Gambar 4. Penurunan harga rms
2.3 Reaktansi (Reactance )
Review hukum Ohm : V = I x R V= tegangan I = arus R = resistan = ρ.l/A-----properti ρ.l/A-----properti dari suatu material atau komponen electrik untuk menghambat aliran arus searah.
Sedangkan reaktan adalah property suatu komponen untuk mempengaruhi voltase dan arus bolak-balik. Ada dua tipe reaktansi, yaitu reaktansi induktif dan reaktansi kapasitif. Sedangkan gabungan kombinasi reaktansi dan resistansi yang
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memasukkan material berpermeabilitas tinggi (sebagai contoh
besi) kedalam kedalam
lilitan; hal inilah bagaimana elektromagnet terbentuk.
Gambar 5. Dasar induktor atau solenoid
Gambar 6. Arus tertinggal 90o dari voltase. voltase. Fungsinya Fungsinya V(t) = Vmax (sin ωt ) dan I(t) = Imax (sin ωt –π/2)
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Efek dari induktor pada rangkaian a.c. diekpresikan oleh reaktansinya, ditulis XL. Reaktansi induktif adalah hasil frekuensi angular a.c. dan induktansi (L, bersatuan henry (H) ) XL = ω.L
Penurunan
tegangan
(V)
melalui
suatu
induktor
adalh
hasil
perkalain
induktansinya L dan laju perubahan arus I melaluinya. V=L
I t
2.5 Reaktansi kapasitif
Tipe reaktansi yang lain adalah reaktansi kapasitif. Komponen dasar kapasitif adalah kapasitor. Suatu kapasitor terdiri dari dua permukaan penghantar atau plat yang saling berhadapan dan dipisahkan oleh gap kecil. Plat ini dapat membawa muatan listrik dengan pengisian yang berlawanan. Dengan pengisian yang berlawanan pada plate berbeda, sangat dekat tapi tidak menyentuh, memungkinkan mengumpulkan muatan yang besar pada masing-masing plat.
Gambar 7. Konsep dasar kapasitor
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berkurang efektifitasnya efektifi tasnya dalam mendukung medan listrik untuk mentransmisikan segala sesuatu. Tanda negative menunjukkan effek yang berlawanan terhadap induktor. Artinya, jika induktif dan kapasitif saling ditambahkan, mereka akan cenderung mentiadakan. Seperti halnya di induktor, suatu kapasitor akan menyebabkan perbedaan phase antara arus dan voltase dalam rangkaian a.c. Suatu kapasitansi murni menyebabkan arus mendahului (leading) voltase 90 0.
Gambar. 8. Arus mendahului voltase 90 o Analog dengan induktor, terdapat persamaan hubungan antara arus, voltase untuk kapasitor, yaitu : I =C
V t
2.6 Impedansi.
Dituliskan sebagai Z, merupakan kombinasi antara reaktansi dan resistansi namun bukan merupakan penjumlahan antara R dan X. Z adalah penjumlahan vector antara ant ara R dan X pada bidang complex, dimana bagian realnya
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BAB III METODOLOGI PRAKTIKUM
3.1 Alat dan bahan percobaan :
1. Breadboard 2. Kabel Penghubung 3. Signal generator 4. Multimeter 5. Hambatan 40 Ohm 6. Kapasitas 4,7 μF dan 1Μf 7. Induktor 0,5 mH dan 1 mH
3.2 Prosedur Percobaan:
A. Rangkaian AC seri. 1. Pasang Komponen k-47 ohm dan c-47 c-4 7 μF secara seri pada gambar 1 rangkain rc seri. 2. Siapkan generator dengan keluaran sekitar 6 volt dengan frekuensi 500hz (sebagai sumber tegangan simunoidal) dan hubungkan dengan rangkain RC seri. 3. Ukur tegangan pada R.C dan pada RC dengan multimeter tegangan AC. 4. Ulangi percobaan diatas memakai komponen R-47 Ohm dan C1μf. B. Rangkaian RL seri
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5. Lepas Induktor dari rangkaian dan ukur hambatan dalam induktor dengan memakai multimeter pada pengukuran hambatan. 6. Ulangi percobaan diatas dengan memakai komponen R-7 ohm dan L-1 L-1 μF
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BAB IV HASIL
A. Rangkaian RC seri 1.
Frekuensi 500 Hz R
C
VR
VC
VS=VRC
(Ω)
(µF)
(V)
(V)
(V)
47
4,7
0,1
0,4
0,6
Perhitungan
a)
R : 47 Ω dan C: 5,6 µF Xc :
Z (Ω)
I (A)
ϴ( )
Peff (watt)
82,44
7,27 x 10 -3
75,96
3,6 x 10 -4
)( )
Xc : (
Xc : 67,77 Z2 : R 2 + XC2 Z :
√
Z : 82,44 Ω I
:
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2.
b)
Frekuensi 1000 Hz R
C
VR
VC
VS=VRC
(Ω)
(µF)
(V)
(V)
(V)
47
4,7
0,1
0,1
0,3
Z (Ω)
I (A)
ϴ(0)
Peff (watt)
57,93
5,18 x 10 -
45
2,59 x 10 -
Perhitungan R : 47 Ω dan C: 4,7 µF Xc : Xc :
( ) )( )
Xc : 33,86 Z2 : R 2 + XC2 Z :
√
Z : 57,93
I : Tan : I
:
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B. Rangkaian RL seri 1.
Frekuensi 500 Hz R
L
VR
VL
VS=VRL
(Ω)
(µF)
(V)
(V)
(V)
47
1
0,1
0,8
1,3
XL :
Z (Ω)
I (A)
ϴ( )
Peff (watt)
47,19
0,0275
3,79
0,166
Perhitungan
c)
R : 47 Ω dan L: 1 mF
XL : 3,141 Z2 : ( R + r ) 2 + XL2 Z :
( ) √ ()
Z : 47,19
I :
I : 0,0275 Tan
:
( ) ()
: 3,79O
Pmaks : ( V + V ) x I
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2.
Frekuensi 1000 Hz R
C
VR
VC
VS=VRC
(Ω)
(µF)
(V)
(V)
(V)
47
1
0,1
1,1
1,1
Z (Ω)
I (A)
ϴ( )
Peff (watt)
47,51
0,0316
7,54
0,131
Perhitungan
d)
R : 47 Ω dan L: 1 mF XL :
XL : 6,283 Z2: ( R + r ) 2 + XL2 Z:
( ) √ ()
Z : 47,51
I:
I : 0,0316
: ( ) ( ) : 7,524
Tan
o
Pmaks : ( V + V ) x I
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Bobby A Palem 240110090033
BAB V PEMBAHASAN
Pada praktikum ini, praktikan membuat rangkaian RC seri dan RL seri. Resistor yang digunakan pada kedua rangkaian tersebut sebesar 47 Ω. Pada rangkaian RC, kapasitor yang digunakan adalah kapasitor 4,7 mF. Sedangkan pada rangkaian RL, inductor yang digunakan 1 µF. Namun, kedua rangkaian tersebut sama-sama menggunakan frekuensi sebesar 500 Hz dan 1000 Hz. Secara umum, praktikan sudah dapat membuat kedua rangkaian tersebut karena melihat gambar yang tertera pada modul. Namun, pemahaman mengenai perbedaan antara keduanya, fungsi kedua rangkaiannya, dan konsep mengenai hal tersebut belum sepenuhnya dipahami. Perbandingan data pada rangkaian RC seri
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Perbandingan data pada rangkaian RL seri 1. Frekuensi 500 Hz Z (Ω)
I (A)
ϴ(
1,3
47,19
0,0275
3,79
0,166
Z (Ω)
I (A)
ϴ(
Peff (watt)
47,51
0,0316
7,54
R
L
VR
VL
VS=VRL
(Ω)
(mF)
(V)
(V)
(V)
47
1
0,1
0,8
)
Peff (watt)
2. Frekuensi 1000 Hz R
L
VR
VC
VS=VRL
(Ω)
(mF)
(V)
(V)
(V)
47
1
0,1
1,1
1,1
)
0,131
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modul, tertulis bahwa rumus kuat arus (I) adalah V s/Z = VR /R = V L/XL . Hal ini akan berpengaruh terhadap nilai sudut (θ), P maks dan Peff .
Hal tersebut kemungkinan terjadi karena angka yang ditampilkan oleh multimeter selalu berubah-ubah, sehingga pengamat sedikit kesulitan untuk menentukan angka yang dianggap relative konstan. Maka dari itu, pengukuran dilakukan sebanyak 3 kali, sehingga diambil nilai rata-ratanya agar menghasilkan nilai yang mendekati sama.
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Adinda Nurfadillah 240110090035
BAB V PEMBAHASAN
Dalam praktikum kedua ini yang berjudul Rangkaian Kapasitif dan Induktif, praktikan di intruksikan untuk membentuk rangkaian RC dan RL dalam bentuk seri. Dalam rangkaian RC seri, praktikan memasang memasang komponen R= 47 Ω dan C= 4,7µF seperti rangkaian RC seri yang terdapat pada modul yang diberikan oleh asisten. Lalu, hubungkan dengan signal generator yang telah disesuakan keluarannya sekitar 2 volt dan frekuensi 500 Hz. Setelah melakukan yang di intruksikan, praktikan mengukur R,C dan RC dengan multimeter tegangan AC. Namun ternyata terjadi perbedaan hasil antara antara
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Ramdhani Pratama Hakim 240110090036
BAB V PEMBAHASAN
Dalam praktikum kedua ini yang berjudul Rangkaian Kapasitif dan Induktif, sebelumnya praktikan diharapkan untuk memahami konsep rangkaian listrik secara kapasitif dan induktif kemudian praktikan di intruksikan untuk membentuk rangkaian RC dan RL dalam bentuk seri. s eri. Dalam rangkaian RC seri, praktikan memasang memasan g komponen R= 47 Ω dan C= 4,7µF seperti rangkaian RC seri Kemudian kami
menghubungkan
dengan signal
generator yang telah disesuakan sekitar 2 volt dan frekuensi 500 Hz. Setelah itu kemudian kami mengukur RC dan RC dengan multimeter tegangan AC. Namun hasil yang diperoleh secara menggunakan multimeter
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Bobby A Palem 240110090033 BAB VI KESIMPULAN KESIMPULAN DAN SARAN 6.1 Kesimpulan
Dari praktikum ini dapat disimpulkan bahwa : 1. Induktansi yang merupakan tahanan yang diakibatkan oleh adanya induktor yang dikenal dengan istilah reaktansi induktif.
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Adinda Nurfadillah 240110090035 BAB VI KESIMPULAN KESIMPULAN DAN SARAN
6.1
Kesimpulan
Dari praktikum ini dapat disimpulkan bahwa :
Ternyata terjadi perbedaan hasil antara pengukuran menggunakan
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Ramdhani Pratama Hakim 240110090036
BAB VI KESIMPULAN KESIMPULAN DAN SARAN
6.1
Kesimpulan
Berdasarkan pembahasan dapat disimpulkan bahwa : 1. Besarnya reaktansi dipengaruhi oleh besarnya frekuensi gelombang
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DAFTAR PUSTAKA
DOE Fundamentals Handbook Electrical Science Volume 3 of 4, U.S. Department of Energy Washington, D.C. 20585. Electrical and Electronic Principles and Technology, Third Edition Edition,, John Bird, Elsevier Ltd, 2007.
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LAMPIRAN