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IS-limiter
-6841E
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Medium voltage
technology
Medium voltage
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-6549E
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IS-limiter
The worlds fastest
switching device
Reduces substation cost Solves short-circuit problems
in new substations and substation extensions
Optimum solution for interconnection of
switchboards and substations
In most cases the only technical solution
Tried and tested in thousands of installations
Worldwide in service
The peak short-circuit current will never be
reached
The short-circuit current is limited
at the very first current rise
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Medium voltage
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Medium voltage
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IS-limiterThe worlds fastest
switching device
Link between
in-plant generation and
public systems
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Medium voltage
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Medium voltage
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Technical Data
0.75 kV, ...5000 A, ...140 kARMS
12 kV, ...4000 A, ...210 kARMS
17.5 kV, ...4000 A, ...210 kARMS
24 kV, ...3000 A, ...140 kARMS
36 kV, ...2500 A, ...140 kARMS
40.5 kV, ...2500 A, ...140 kARMS
For higher rated currentsIS-limiters can be connected in parallel.
Rated
voltageRated
currentInterrupting
current
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Insert holder and insert
Current commutated to fuseCurrent path uninfluenced
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Single line diagram of a busbar system
with IS-limiterCurrent curve i=i1+ i2at the short-circuit location
Breaking of a short-circuit current by IS-limiter
i=i1+ i2 without
IS-limiter
i=i1+ i2with IS-limiterIS-limiter
CB
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Medium voltage
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Medium voltage
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IS-limiterinstalled in bus-tie
Advantages: Improving power quality,
Increasing the reliability of the system,
Reduction of the network-impedance,
Optimal load flow, Existing busbar system has not to be changed.
IS-limiter
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Medium voltage
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Medium voltage
technology
-6556E11
-06-2003-
IS-limiter in generator feeder
Advantages:
Generator can be connected independent on
the short-circuit capability of the system,
Existing busbar system has not to be changed,
No need of expensive generator breaker.
M di lt
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Medium voltage
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-6557E11-06-2003-
IS-limiter for connection of agenerator
to a fully loaded system
Advantages:
Private / industrial generator feeder can be
connected to the (fully loaded) grid,
Selective tripping of the IS-limiter (IS-limiter willoperate only for short-circuit faults in the grid)
IS-limiter in the bus-tie
with current-direction
comparison
Tripping of IS-limiter
No Tripping of IS-limiter
M di ltMedium voltage
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IS-limiter in parallel withreactor
Advantages:Avoid coppers losses of the reactor,
Avoid voltage drop of the reactor,
No electro-magnetical field on the reactor
Outgoing feeders
Medium voltageMedium voltage
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Medium voltage
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Medium voltage
technology