circuit protection devices perfect ppt
TRANSCRIPT
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Sigma Institute of Engineering
Information Technology(1ST SEMESTER)
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Prepared by; name en.number • Vikram rajpurohit 140500116033• Taxak mistery 140500116016• Pranay Patel 140500116026• Parth patel 140500116025• Paras patel 140500116024• Akshay rana 140500116034
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INTRODUCTIONFrom 19th century use of electricity was started.Electricity is usefull in domestic & industrial
purpose.Proper precautions should be taken for the
safety and protection of electricity otherwise it may even lead to death.
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Elements of electrical
engineering Circuit protection devices
• Fuses • MCB• ELCB• RELAY
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FuseS Fuse Is simplest device,which
brakes the circuit under abnormal condition
It is used for overload/short circuit protection in medium voltage (up to 33kV) and low voltage (up to 400V) installations.
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CONSTRUCTION OF FUSE
• The main components of a standard fuse unit consist of the
following items:I. Metal fuse elementII. Set of contactsIII.Support bodyIV. Connection
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Fuses Glass Cartridge
Mini fuse
Auto fuse
Maxi fuse
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ADVANTAGES OF FUSESSpeed of operation is very highMaintenance cost is practically zeroThey are capable of clearing high as well
as low faults currentthey provide reliable operation
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DISADVANTAGESHead produced by the arc may affect the associated switches
They have to be replaced after each operation
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MCBMiniature circuit breaker and moulded
case circuit have a feature of a good h.r.c. fuse and a good switch.
These can be used for switching purpose under normal operating condition and circuit breaker under overloading.
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MCBAll other metal parts are made up of
nonferrous ,non-rusting type materials.These are used in low voltage domestic,
commercials and industrial application.
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DIMENSION OF MCB
symmetricalrail external
partdepth
width
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Earth leakage circuit breaker (elcb)the metal housing of the induction of the
induction motor is always connected to earth. if the user standing on earth touches the “live”
point, the protection against such current is essential
and it is provide by device called (elcb) operation under the fault condition
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Earth leakage circuit breaker (elcb)when the fault occurs , the leakage current
start flowing through conductor as Explained earlier.So there will be non zero flux set up in current transformer core.
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specificationminiature circuit breaker are available
following…Current ratting : 5,10,15,20,30,40 ampVoltage rating :a.c. voltage rating –
240v/415 d.c. voltage ratting –
50v/110Rupturing capacity : 3ka at 50v
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RelaysRelays use an electromagnet to operate a
switching mechanism mechanically , but other operating principles are also used.
Relays are used where it is necessary to control a circuit by low power signal or where several circuits must be controlled by 1 signal.
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RelaysA type of relay that can handle the high power
required to directly control an electric motor or other loads is called a contactor.
Solid state relays control power circuits with no moving parts instead using a semiconductor device to perform switching .
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CONCLUSIONI have collected some information from my study material and some from internet.I have studied about all aspect of “FUSES, MCB, ELCB And RELAY”And prepared this document as per my best knowledge.
GUIDED BY; Prof. Mustakim Haveliwala
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