Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)
Tags: circuit, breaker, full, report, Frame, Trip Unit, Arc Extinguisher, Air BreakMiniature Circuit Breaker, Oil Circuit Breaker, Air Blast Circuit Breaker, SF6 Circuit Breaker, Vacuum Circuit Breaker, circuit breaker in stock market, circuit breakers pdf, circuit breaker theory, circuit breaker testing, circuit breaker ratings, circuit breaker tripping, circuit breaker selection, circuit breaker manufacturers, circuit breaker ppt, circuit breaker pdf,
Ask More Info Of  A Seminar Ask More Info Of A Project Post Reply  Follow us on Twitter
13-04-2010, 10:59 AM
Post: #1
circuit breaker full report

.docx  CIRCUIT BREAKER3.docx (Size: 478.97 KB / Downloads: 1257)

Technical Seminar Synopsis On CIRCUIT BREAKERS

Presented By
- Naveen T.M
(1SI06EC069)
Siddaganga Institute of Technology
Electronics & Communication Engineering

CIRCUIT BREAKERS
Abstract:
A circuit breaker is an automatically-operated electrical switch which is designed to protect an electrical circuit from damage caused by overload or short circuit.
Used to prevent the heavy current from damaging power system components.
Unlike fuses, normal operation can be resumed with minimal turn around time.
Keywords:
Frame,Trip Unit,Arc Extinguisher,Air Break/Miniature Circuit Breaker,Oil Circuit Breaker,Air Blast Circuit Breaker,SF6 Circuit Breaker ,Vacuum Circuit Breaker.
1. Introduction:
First ever circuit breakerà SF6 type circuit breaker in the year 1938 by Germany. Researcher:Vitaly Grosse.USA developed it in the year 1951.Researchers: Lingal, Browne and Storm .First industrial application in the year 1953.
Circuit breakers requires to reduce arcing ie, Sparks jump for several inches in the highly ionized ambient atmosphere.
The Culprit: Arcing
Sparks jump for several inches in the highly ionized ambient atmosphere.
The high current can still damage the circuit.
Arcing is analogous to Flash-over in transmission lines.
2. Block diagram:
2.1 Frame:
¢ Provides space for mounting the components & holding them in place.
¢ Must withstand mechanical stresses.
¢ Provides insulation & isolation path for current.
2.2 Contacts:
¢ Provides a method for connecting the circuit with the system.
¢ Forms a part of the isolation circuit.
Basic functions:
¢ Opening
¢ Closing
2.2.1 Operation: Opening
¢ Spring is generally used for the purpose.
¢ Opening process is faster.
¢ Spring gets recoiled during Closing Operation.
2.2.2 Operation: Closing
¢ Solenoid is generally used for the
purpose.
¢ Closing process is slower.
¢ Force of attraction increases with reduction in distance.
2.3 Trip unit:
Opens the circuit during
¢ Thermal overload
¢ Short circuit
¢ Ground Fault
2.4 Arc extinguisher:
¢ Circuit Breakers differ in the type arc extinguishers used in them.
¢ Extinguishes an arc when contacts are opened.
3. Classification:
Based on operational voltage
¢ Low voltage circuit breakers
eg: air break circuit breaker.
¢ Medium voltage circuit breakers
eg: vacuum circuit breaker.
¢ High voltage circuit breakers
eg: sf6 circuit breaker.
3.1 Air break circuit breaker:
¢ Quenching medium: Air at atmospheric pressure.
¢ Suitable for high current interruption at low voltage.
¢ Principle of high resistance is used for arc interruption.
3.2 Vacuum circuit breaker:
¢ Arc Quenching medium: High Vacuum.
¢ Air at a pressure of 10-5 mm & below is called High Vacuum.
¢ An arc formed at a small separation of 1cm can also be extinguished efficiently.
¢ Contacts made of special materials.
3.3 Sf6 circuit breaker:
¢ Specialty: inert, non-toxic, non flammable heavy gas.
¢ High dielectric strength(2.5 times that of air)
¢ Disadvantage: Decomposes at high temperature.
¢ With moisture, it may spoil the parts of CB.
3.3.1 Sub categories:
¢ Double-pressure SF6 Circuit breakers
àEarly type of SF6 Circuit breaker
¢ Puffer type Circuit Breakers
àUses SF6 in a compressed form
4. Advantages:
¢ Protect an electrical circuit from overload.
¢ Protect an electrical circuit from shortcircuit.
¢ Used for high speed arc interruption
¢ Oil can be used for both insulation & arc extinguishing purpose.
5. Disadvantage:

¢ Sf6 used in circuit breakers decomposes at high temperature.
¢ With moisture, Sf6 may spoil the parts of circuit breaker.
¢ Higher the operating voltage more is the Oil required in bulk oil circuit breaker.
6. Applications of circuit breaker:
¢ UPS Equipment
¢ Power Supplies
¢ Small Generators
¢ Entertainment Systems
¢ Vending Machines
¢ Office Machines
¢ Telecom Power Distribution
¢ Railway Signaling System
¢ Automatic control systems
¢ Generator sets
¢ AC and DC Branch Circuit Protection
¢ Power conversion systems
7. Conclusion:
It prevent the heavy current from damaging power system components.
Unlike fuses, normal operation can be resumed with minimal turn around time.
8. References:
¢ Scientific american by robert.r.birge.
¢ The lock key paraldigm by michael consad.

Please Use Search http://seminarprojects.com/search.php wisely To Get More Information About A Seminar Or Project Topic
24-07-2010, 11:59 AM
Post: #2
RE: circuit breaker full report
many many thanks.................

Please Use Search http://seminarprojects.com/search.php wisely To Get More Information About A Seminar Or Project Topic
16-10-2010, 03:56 PM
Post: #3
Shocked RE: circuit breaker full report

.ppt  ABCB.ppt (Size: 1.47 MB / Downloads: 509)
This article is presented by:
Shah Rishabh G
AIR BREAK CIRCUIT BREAKER


Introduction
These type of breakers employ ‘air blast’ as the quenching medium.
The contacts are opened by air blast produced by the opening of blast valve.
The air blast cools the arc and sweeps away the arcing products to the atmosphere.
This rapidly increases the dielectric strength of the medium between contacts and prevents from re-establishing the arc.
So the arc is extinguished and the flow of current is interrupted.
Types of Air blast circuit breaker
(1). Axial-blast type (2).Cross-blast type (3).Radial-blast type


Types of Air blast circuit breaker
Axial-blast type:-

In which the air-blast is
directed along the arc path as




In which the air-blast is
directed at right angles to the
arc path as shown in Fig.

Please Use Search http://seminarprojects.com/search.php wisely To Get More Information About A Seminar Or Project Topic
22-01-2011, 03:24 PM
Post: #4
RE: circuit breaker full report



BEN McQUILLAN

WHAT TO TAKE HOME FROM THIS SEMINAR…

A MORE INTIMATE KNOWLEDGE OF THE ELECTRICAL SYSTEM OF YOUR AIRPLANE
AN OPERATIONAL UNDERSTANDING OF ELECTRICAL SYSTEM PROTECTION
FLEXIBLE DEFINITIONS OF ESSENTIAL & NON-ESSENTIAL ELECTRICAL SYSTEMS
A “CAPTAIN MINDSET” FOR THE MANAGEMENT OF YOUR AIRCRAFT SYSTEMS

WHAT IS A CIRCUIT BREAKER?
A “GATE” THROUGH WHICH ELECTRICITY TRAVELS FROM THE BATTERY TO THE COMPONENT WHICH THE CIRCUIT BREAKER PROTECTS
ABLE TO OPEN AUTOMATICALLY WHEN THE WIRING OF THE CIRCUIT GETS TOO HOT (TOO MUCH VOLTAGE AND/OR RESISTANCE) TO REMOVE ALL ELECTRICITY FROM CONTINUING BEYOND THE BREAKER TO THE COMPROMISED AREA

TYPES OF CIRCUIT BREAKERS

PULL-TYPE CIRCUIT BREAKERS
NON PULL-TYPE CIRCUIT BREAKERS
CIRCUIT BREAKER SWITCHES


WHAT DO THEY DO?
A CIRCUIT BREAKER SENSES AN OVERLOAD CONDITION WITHIN ITS ELECTRICAL CIRCUIT
GROUND FAULTS/ARCING
OVER-VOLTAGE/OVER-TEMPERATURE
IT WILL AUTOMATICALLY PREVENT ANY BATTERY POWER FROM CONTINUING BEYOND THE BREAKER TO THE FAULTY WIRING & COMPONENT

HOW DO THEY DO IT?
NORMAL LOAD VS. OVERLOAD
CIRCUITS TYPICALLY CARRY ½ THEIR RATED LOAD (NUMBER ON BREAKER LABEL)
OVERLOAD = EXCESSIVE HEAT
EXCESSIVE HEAT TRIPS BREAKER
NORMALLY FLAT LAYERED METAL STRIPS EXPAND AT DIFFERENT RATES, CURVE, AND BREAK AWAY FROM ELECTRICAL CONNECTION


more


22-01-2011, 04:24 PM
Post: #5
RE: circuit breaker full report



.ppt  ex ppt.ppt (Size: 1,008.5 KB / Downloads: 353)

presented by: M Aamir sohail khan & sufyan saleem



WHAT IS A CIRCUIT BREAKER?

A circuit breaker is an equipment that breaks a circuit either manually or automatically under all conditions at no load, full load or short circuit.

Operating Principle

Two contacts called electrode remains closed under normal operating conditions. When fault occurs on any part of the system, the trip coil of the circuit breaker get energized and contacts are separated.

Arc Phenomenon

An arc is struck when contacts are separated. The current is thus able to continue. Thus the main duty of a circuit breaker is to distinguish the arc within the shortest possible time.

The arc provides the low resistance path to the current and the current in the circuit remains uninterrupted.

The arc resistance depends upon the following factors.



Degree of ionization
Length of the arc
Cross Section of the arc

Methods of Arc Extinction




High Resistance Method

Low Resistance Method

Breaker Used I n 132KV Grid Station

Oil Circuit Breaker
Vacuum Circuit breaker
SF6 Circuit Breaker

Low Oil Circuit Breaker

Consists of two parts.
Supporting Chamber.
Circuit-Breaking chamber( consist of fixed and moving contact)

Disadvantages Of Oil Circuit Breaker
It is inflammable and there is a risk of fire.
It may form an explosive mixture with air.
It requires maintenance.
Absorbs moisture, so dielectric strength reduces.
Oil leakage problem.
Oil has to be replaced after some operations because of the carbonization of oil.

Vacuum Circuit Breaker
Vacuum is used as an arc quenching medium.
Have greatest insulating strength.
10-7 to 10-5 pressure is to be maintained.
Used in 11KV panel in control room of grid station.

Advantages
Compact, reliable and have longer life.
No fire hazards.
No generation of gas during and after operation.
Can interrupt any fault current.
No noise is produced while operating.
Require less power for control operation.

SF6 Circuit Breaker
Sulphur Hexafluoride (SF6) gas is used as an arc quenching medium.
SF6 is an electro-negative gas.
It has strong tendency to absorb electrons.
When contact are opened in a high pressure flow of SF6 gas, arc produced.
Free electron in the arc are captured by the gas.
Which build up enough insulation strength to extinguish arc.
it is much effective for high power and high voltages services,

Advantages
Simple construction, less cost.
SF6 gas is non flammable, non toxic & chemical inert gas.
Same gas is recirculated in the circuit.
Maintenance free C.B.
Ability to interrupt low and high fault current.
Excellent Arc extinction.

Advantages Of SF6 Over Oil Circuit Breakers

Short arcing time
Can interrupt much larger currents
Gives noiseless operation due to its closed gas circuit
No moisture problem
No risk of fire
No carbon deposits. So no tracking and insulation problems
Low maintenance cost



Rating circuit breaker full report Options
Share circuit breaker full report To Your Friends :- Seminar Topics Bookmark
Post Reply 

Marked Categories : sf6 ppt, electric circuit network, full report on circuit breakers, circuit breaker, minature ckt breaker project report, miniature circuit breaker ppt, circuit breakers, vacuum circuit breaker ppt, electronic circuit breaker project, full report topics on power systems, abstract of circuit breakers, sf6 circuit breaker ppt, arc interruption phenomena ppt, diadvantages of sf6 circuit breaker, ppt presentation for electrical engineering of circuit breakers, air break circuit breaker pdf, seminar topics on vacuum circuit breaker, electronic circuit breaker, seminer report on sf6 circuit breaker, selection of electrical contact material for oil circuit breaker,

[-]
Quick Reply
Message
Type your reply to this message here.


Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  UPS Uninterruptible power supply seminar report project maker 0 14 Today 02:33 PM
Last Post: project maker
  SOLAR POND TECHNOLOGY SEMINAR REPORT project maker 0 14 Today 02:27 PM
Last Post: project maker
  FEEDERS AND ITS PROTECTION SEMINAR REPORT seminar code 0 18 Today 02:05 PM
Last Post: seminar code
  POWER GRID CONTROL WITH FAULT DETECTION SEMINAR REPORT project maker 0 36 Yesterday 03:08 PM
Last Post: project maker
  Electricity Generation from Speed Breakers seminar report project maker 0 11 Yesterday 02:35 PM
Last Post: project maker
  WIND NON-CONVENTIONAL ENERGY SEMINAR REPORT project maker 0 24 Yesterday 02:02 PM
Last Post: project maker
  ELECTRICITY GENERATION FROM WIND MILL SEMINAR REPORT project maker 0 26 Yesterday 11:57 AM
Last Post: project maker
  D- Facts & D-STATCOM seminar report project maker 0 19 Yesterday 10:36 AM
Last Post: project maker
  Amorphous core transformer seminar report project maker 0 16 Yesterday 10:33 AM
Last Post: project maker
  TERABIT SWITCHES AND ROUTERS SEMINAR REPORT project maker 0 17 Yesterday 10:18 AM
Last Post: project maker
This Page May Contain What is circuit breaker full report And Latest Information/News About circuit breaker full report,If Not ...Use Search to get more info about circuit breaker full report Or Ask Here

Options: