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PFTL201C 10KN/20KN/50KN ABB Tension controller head
PFTL201C 10KN/20KN/50KN ABB Tension controller head
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The following diagram shows the limit curve for Tmax T2L160, In160 circuit-breaker.
The x-axis shows the effective values of the symmetrical prospective short-circuit
current, while the y-axis shows the relative peak value. The limiting effect can
be evaluated by comparing, at equal values of symmetrical fault current, the
peak value corresponding to the prospective short-circuit current (curve A) with
the limited peak value (curve B).
Circuit-breaker T2L160 with thermomagnetic release In160 at 400 V, for a fault
current of 40 kA, limits the short-circuit peak to 16.2 kA only, with a reduction
of about 68 kA compared with the peak value in the absence of limitation (84 kA)
Considering that the electro-dynamic stresses and the consequent mechanical
stresses are closely connected to the current peak, the use of current limiting
circuit-breakers allows optimum dimensioning of the components in an electrical
plant. Besides, current limitation may also be used to obtain back-up protection
between two circuit-breakers in series.
In addition to the advantages in terms of design, the use of current-limiting
circuit-breakers allows, for the cases detailed by Standard IEC 60439-1, the
avoidance of short-circuit withstand verifications for switchboards. Clause
8.2.3.1 of the Standard “Circuits of ASSEMBLIES which are exempted from
the verification of the short-circuit withstand strength” states that:
“A verification of the short-circuit withstand strength is not required in the
following cases.
…
For ASSEMBLIES protected by current-limiting devices having a cut-off current
not exceeding 17 kA at the maximum allowable prospective short-circuit current
at the terminals of the incoming circuit of the ASSEMBLY.
...”
The example above is included among those considered by the Standard: if
the circuit-breaker was used as a main breaker in a switchboard to be installed
in a point of the plant where the prospective short-circuit current is 40 kA, it
would not be necessary to carry out the verification of short-circuit withstand.
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