1. Superconducting Fault
Current Limiter
Name- Varsha
Pradhan
Regd. No.-
0901106015
Branch- Electrical

7. Fig. ‘ Fault control with a fault-current limiter

9. Types of Superconductor
SFCL types includes
o Resistive SFCL,
oInductive shielded core
SFCL.

10. Resistive
SFCL
• Superconductor connected in series with the line
to be protected.
• To keep it superconducting, it is usually
immersed in a coolant that is chilled by a
refrigerator.
• In case of a fault the inrush of current and
magnetic field take the super conductor into the
transition region, thereby the increasing
resistance limits the fault current.
• The behavior of resistive fault current limiter is
largely determined by the length of the
superconductor and the type of material used for
it.

16. 139 kV-Class SuperLimiter Design Concept

17. Fault-Current Limiter Applications
Fault-current limiters can be applied in a number of distribution or transmission areas
Three main applications areas are
• Fault-current limiter in the main position. The fault-current
limiter FCL protects the entire bus
• Fault-current limiter in the feeder position. The fault-
current limiter FCL protects an individual circuit on the
bus. Underrated equipment can be selectively protected
as needed in this manner.
• Fault-current limiter in the bus-tie position. The two buses
are tied, yet a faulted bus receives the full fault current of
only one transformer.

18. Fault-current limiter in the main
position.
The fault-current limiter FCL
protects the entire bus.
The most direct application
of a fault-current limiter is
in the main position on a
bus (Fig. ).
Benefits of an FCL in this
application include the
following:
• a larger transformer can
be used to meet
increased demand on a
bus without breaker
upgrades
• I2 Rt damage to the
transformer is limited

19. Fault-current limiter in the
feeder position.
• The fault-current limiter
FCL protects an individual
circuit on the bus.
Underrated equipment can
be selectively protected as
needed in this manner.
• An FCL can also be used
to protect individual loads
on the bus (Fig.). The
selective application of
small and less expensive
limiters can be used to
protect old or overstressed
equipment that is difficult
to replace, such as
underground cables or

20. Fault-current limiter in the bus-tie position.
The two buses are tied, yet a faulted bus receives the full fault
current of only one transformer.
An FCL can be used in the bus-tie position (Fig. ).
Such a limiter would require only a small load current rating but
would deliver the following benefits:
• separate buses can be tied together without a large increase in
the fault duty on either bus
• during a fault, a large voltage drop across the limiter maintains
voltage level on the unfaulted bus

21. Benefits
In comparison to conventional
technology, HTS fault current limiters
provide
• Over 100 times faster response time
• 10 to 20 times shorter recovery time
• Time-adjustable response functions
• 1000 times the number of full-power
protection cycles

22. Conclusion
• Electric power disruptions cause hundreds of
millions of dollars worth of economic loss
every year to the world’s leading economies.
Worldwide energy demand is increasing
rapidly, requiring new solutions to
dramatically improve the reliability of our
energy supply.
• Fault Current Limiters are new devices, using
the unique electrical properties of HTS to
almost instantaneously protect power grids
against short circuits and thereby prevent
costly outages. They are a key member of a
family of ultra-fast HTS devices and