Definition Contactor
— Nama:Aji Pradana/1620201089
The
concept for DP contactors and starters originated in the 1950s at the request
of several large HVAC OEMs. A contactor is an electrically controlled
switch used for switching an electrical power circuit, similar to relay except
with higher current ratings. A contactor is controlled by a circuit which
has a much lower power level than the switched circuit.
Contactors come in many forms with varying capacities and features. Unlike
a circuit breaker,
a contactor is not intended to interrupt a short
ciruiit current.
Contactors range from those having a breaking current of several amperes to
thousands of amperes and 24 V DC to many kilovolts. The physical size of
contactors ranges from a device small enough to pick up with one hand, to large
devices approximately a meter on a side.
Contactors are used to control electric motors, lighting, heating, capacitor banks, thermal evaporators,
and other electrical loads. A contactor has three components. The contacts are
the current carrying part of the contactor. This includes power contacts,
auxiliary contacts, and contact springs. The electromagnet (or
"coil") provides the driving force to close the contacts.
The enclosure is
a frame housing the contact and the electromagnet. Enclosures are made of
insulating materials like Bakelite, Nylon
6, and thermosetting
plastics to protect
and insulate the contacts and to provide some measure of protection against
personnel touching the contacts. Open-frame contactors may have a further
enclosure to protect against dust, oil, explosion hazards and weather.NO
(Normally Open) on the contactor is located in the coil number 13 and 14 ,
while NC(Normally Close) is located in the coil number 21 and 22.
Magnetic blowouts use blowout coils to lengthen and move the
electric arc. These are especially useful in DC power circuits. AC arcs have
periods of low current, during which the arc can be extinguished with relative
ease, but DC arcs have continuous high current, so blowing them out requires
the arc to be stretched further than an AC arc of the same current. The
magnetic blowouts in the pictured Albright contactor (which is designed for DC
currents) more than double the current it can break, increasing it from 600 A
to 1,500 A.
Sometimes
an economizer circuit is also installed to reduce the power required to keep a
contactor closed; an auxiliary contact reduces coil current after the contactor
closessomewhat greater amount of power is required to initially close a
contactor than is required to keep it closed. Such a circuit can save a
substantial amount of power and allow the energized coil to stay cooler.
Economizer circuits are nearly always applied on direct-current contactor coils
and on large alternating current contactor coils.
A basic contactor will have a coil input (which may be driven by either an AC
or DC supply depending on the contactor design). The coil may be energized at
the same voltage as a motor the contactor is controlling, or may be separately
controlled with a lower coil voltage better suited to control by programmable
controllers and
lower-voltage pilot devices. Certain contactors have series coils connected in
the motor circuit; these are used, for example, for automatic acceleration
control, where the next stage of resistance is not cut out until the motor
current has dropped.
Translate
Konsep untuk kontaktor DP dan pemula berasal dari tahun 1950-an atas permintaan
beberapa OEM HVAC besar. Sebuah kontaktor adalah sebuah saklar yang
dikendalikan secara elektrik digunakan untuk beralih sirkuit listrik, mirip
dengan relay kecuali dengan penilaian saat ini lebih tinggi. Sebuah kontaktor
dikendalikan oleh sebuah sirkuit yang memiliki tingkat daya yang jauh lebih
rendah daripada circuit switched.
Kontaktor datang dalam berbagai bentuk dengan berbagai kapasitas dan
fitur. Tidak seperti pemutus sirkuit, kontaktor tidak dimaksudkan untuk
mengganggu hubungan pendek arus. Kontaktor berkisar dari mereka yang memiliki
arus melanggar beberapa ampere ke ribuan ampere dan 24 V DC ke banyak kilovolt.
Ukuran fisik kontaktor berkisar dari perangkat yang cukup kecil untuk mengambil
dengan satu tangan, untuk perangkat besar sekitar satu meter di sisi.
Kontaktor yang digunakan untuk mengontrol motor listrik, pencahayaan,
pemanasan, kapasitor bank, evaporator termal, dan beban listrik lainnya.
Sebuah kontaktor memiliki tiga komponen. Kontak adalah membawa bagian saat
kontaktor. Ini termasuk kontak listrik, kontak bantu, dan kontak mata.
Elektromagnet (atau "coil") memberikan kekuatan pendorong untuk
menutup kontak. kandang adalah bingkai perumahan kontak dan elektromagnet.
Kandang terbuat dari bahan isolasi seperti Bakelite, Nylon 6, dan thermosetting
plastik untuk melindungi dan mengisolasi kontak dan untuk menyediakan beberapa
ukuran perlindungan terhadap personil menyentuh kontak. Terbuka-frame kontaktor
mungkin memiliki kandang lebih lanjut untuk melindungi terhadap debu, minyak,
bahaya ledakan dan cuaca
. letak NO pada
kontaktor terletak di nomor koil 13 dan 14 sedangkan koil NC berada di nomor
koil 21 dan 22ledakan gas magnetik menggunakan kumparan ledakan untuk
memperpanjang dan memindahkan busur listrik. Ini sangat berguna dalam sirkuit
listrik DC.busur AC memiliki periode rendah saat ini, di mana busur dapat
dipadamkan dengan relatif mudah, tetapi DC busur memiliki arus tinggi terus
menerus, sehingga meniup mereka keluar membutuhkan busur yang akan membentang
lebih jauh dari busur AC dari arus yang sama. The ledakan gas magnetik di
kontaktor Albright yang digambarkan (yang dirancang untuk arus DC) lebih dari
dua kali lipat saat itu dapat mematahkan, meningkat dari 600 A sampai 1.500 A.
Kadang-kadang sirkuit economizer juga dipasang untuk mengurangi daya yang
diperlukan untuk menjaga kontaktor ditutup; kontak bantu mengurangi coil saat
setelah kontaktor menutup. Sebuah jumlah yang agak lebih besar dari daya yang
dibutuhkan untuk awalnya menutup kontaktor dari yang dibutuhkan untuk tetap
ditutup. sirkuit tersebut dapat menyimpan sejumlah besar kekuasaan dan
memungkinkan kumparan energi untuk tetap dingin. sirkuit economizer hampir
selalu diterapkan pada kumparan kontaktor arus searah dan bolak besar kumparan
kontaktor saat ini.
Sebuah kontaktor dasar akan memiliki masukan coil (yang mungkin didorong
oleh baik pasokan AC atau DC tergantung pada desain kontaktor). kumparan dapat
diberi energi pada tegangan yang sama sebagai motor kontaktor mengendalikan,
atau dapat dikontrol secara terpisah dengan tegangan koil yang lebih rendah
lebih cocok untuk mengontrol oleh pengendali programmable dan perangkat pilot
tegangan rendah. kontaktor tertentu memiliki kumparan terhubung seri di sirkuit
motor; ini digunakan, misalnya, untuk kontrol percepatan otomatis, di mana
tahap berikutnya resistance tidak dipotong sampai saat ini motor telah turun.
[2]
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What is Contactor ?
contactor is an electrically controlled switch used for switching an
electrical power circuit, similar to a relay except with higher current
ratings.
who control the contactor ?
A contactor is controlled by a circuit which has a much lower power level than
the switched circuit.
where is the location of NO and NC ?
NO (Normally Open) on the contactor is located in the coil number 13 and 14 ,
while NC(Normally Close) is located in the coil number 21 and 22.
when was the contactor found ?
The concept for DP contactors and starters originated in the 1950s.
why is the economizer circuit also installed in the contactor ?
an economizer circuit is also installed to reduce the power required to
keep a contactor closed; an auxiliary contact reduces coil current after the
contactor closes.
how many components in
the contactor ?
A contactor has three components.
VERBAL AND NOMINAL
SENTENCES
Verbal
1) The contacts are
the current carrying part of the contactor.
2) Acontactor is not intended to interrupt a short
circuit current.
3)The physical size of
contactors ranges from a device small enough to pick up with one hand.
Nominal
1) A contactor has three components.
2) This includes power
contacts, auxiliary contacts, and contact springs.
IDENTIFY TENSES
Present Continous Tense
The contacts are the current carrying part
of the contactor
S To be V1+ing O
Reason : Because the
sentence tell the event which on going
Simple Present Tense
Magnetic
blowouts use
blowout coils to lengthen and move the electric arc
S V1
O
Reason : Because the
sentence is a fact
Active and Passive Sentences
Active
1) The contacts are
carrying part of the contactor.
2) A circuit which
has a much lower power level than the switched circuit contactor
a control.
Passive
1) Part of contactor is being
carried by the contacs.
2) A contactor is controlled by
a circuit which has a much lower power level than the switched circuit.
