Circuit breakers types and description

1. Power Stations & Subtations Lecture Work
Mehmet Çağrı AKSOY

2. ▪A circuit breaker is a device designed to shut off an
electrical circuit when too much current is flowing.
▪This usually occurs if too many devices are plugged in or if
there is a short circuit. Circuit breakers are usually installed
in the electrical panel. Inside the circuit breaker, there is
usually two contacts which is touched between.When
detect a fault in the system, poles are divided each other.
The system reacts to immediate short circuits.The process
can be change different circuit breaker types.

3. ▪ The types of circuit breakers can be divided by these fields;
▪By voltage level
▪ Low Voltage (1-1kv)
▪ MediumVoltage (1-72kv)
▪ HighVoltage (72.5-.. Kv)
▪ Arc suppression type
▪ Air circuit breaker
▪ CO2 circuit breaker
▪ Disconnecting circuit breaker
▪ Oil circuit breaker
▪ Sulfur hexafluoride circuit breaker
▪ Vacuum circuit breaker
▪ Magnetic circuit Breaker

4. ▪The magnetic circuit breakers
uses electromagnet also
called solenoid.
▪When the current exceeds the
specified value, the system is
opened with the help of the
electromagnet and the
current is cut off.

5. ▪ Common in domestic, small
industrial and commercial
applications include Miniature
circuit breaker (type B, type C and
type D)and Molded Case Circuit
Breaker versions.
▪ Characteristics given by
international standards.
▪ Also It is made for DC applications.

6. ▪Oil circuit breaker is very
easy in construction.The oil
behaves, isolator between the
contacts and it uses for arc
extinguishing.
▪Due to environmental and
cost concerns over insulating
oil spills, most new breakers
use SF6 gas to quench the arc.

7. ▪ In this type of circuit
breaker, the contacts of
device surrounded by
SF6
▪ They are most often
used for high voltage
transmission-level
voltages. Especially cold
places heating might be
require to prevent gas
liquefaction.

8. 115KV SF6

9. ▪ The disconnecting circuit breaker
(DCB) was introduced in 2000 and
is a high-voltage circuit breaker
modeled after the SF6-breaker.The
DCB is also high voltage circuit
breaker.
▪ The type of circuit breaker reduces
the space requirement, increases
availability and reliability.

10. ▪In this circuit breaker, the
fixed and moving contact is
enclosed in a permanently
vacuum area.
▪Vacuum circuit breaker has a
high insulating medium for
arc extinction as compared to
the other circuit breaker.
▪When the fault occurs in the
system, the contacts of the
breaker are moved apart and
hence the arc is developed
between them.

11. ▪ Works on the same principle as
Sulphurre hexafluoride circuit
breaker, can also be produced
as a disconnecting circuit
breakers, high voltage breaker
▪ Possible to reduce nearly 10
tons of carbon dioxide
emissions during the product’s
life time .

12. ▪Circuit breaker is an essential part of electrical
network as it protects every device from electrical
damage
▪Helps us to detect the fault and the area associated
with it
▪Nowadays vacuum and sulphur hexaflouride circuit
breakers are widely used due to their reliable and
fast operations

13. ▪ Wikipedia.com, Mr. Priyankar Misra's presentation, circuitglobe.com