Circuit Breakers

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2017-03-25 150K 150 0 0

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Circuit Breakers




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Presentations text content in Circuit Breakers

Slide1

Circuit Breakers

Slide2

Definition

Device designed to open the circuit automatically under abnormal conditions without damage to itself when properly applied within its rating.

Slide3

Circuit breakers are categorized by the method employed to interrupt the circuit current

(extinguishing the arc)

when the current contacts open.

Slide4

Four major types

Air

Oil

Vacuum

Gas (SF6 or SF6/CF4)

Slide5

Two methods circuit breakers sense circuit current

Thermal

Magnetic

Slide6

Thermal circuit breaker

Sense circuit current through the production of heat

Generally uses some type of heating element in series with the load

The heater is located close to a bimetallic strip

The bimetallic strip is mechanically connected to the moveable contacts

Slide7

Thermal circuit breaker

There is a time delay before the circuit opens

The time delay depends on the amount of overcurrent

Slide8

Thermal Circuit Breaker

Schematic symbol

Schematic

Slide9

Magnetic circuit breaker

Also known as Instantaneous trip circuit breaker

Senses circuit current by connecting a coil in series with the load

When current flows thought the circuit, a magnetic field is established around the coil

The magnetic field attracts the metal arm of a solenoid

Slide10

Magnetic circuit breaker

When the magnetic field becomes intense enough the metal arm mechanically opens the contacts

There is very little time delay in opening the contacts when an

abnormal condition

occurs

Slide11

Magnetic Circuit Breaker

Schematic symbol

Schematic

Slide12

Thermomagnetic circuit breaker

Most common typeSchematic symbolEmploys both thermal and magnetic current sensors

Slide13

Four Major Types

Air

Oil

Vacuum

Gas (SF6 or SF6/CF4)

Slide14

Air circuit breaker

Divided into four basic types

1 Moulded Case CB (120V – 750V)

2 Low-Voltage Power CB (120V – 750V)

3 Medium-Voltage CB (1.5kV – 69kV)

4 High-Voltage CB (115kV – 230kV)


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