PFTL101B-5.0KN/20KN 3BSE004203R1 ABB Supply of spare parts for tension controller system

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PFTL101B-5.0KN/20KN 3BSE004203R1 ABB Supply of spare parts for tension controller system
PFTL101B-5.0KN/20KN 3BSE004203R1 ABB Supply of spare parts for tension controller system
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Considering a circuit-breaker type E1B1250 fitted with a PR111/P LSI release
and with TA of 1000 A, it is supposed that for the system requirements, the
protection functions are regulated according to the following settings:
The trip curve of the release is represented in the following figure (continuous
lines): it can be seen that:
• for function L, the curve is represented by the mean value between the
tolerances given by the Standard (the overload protection function must not
trip for current values lower than 1.05·ln, and must trip within 1.3·ln), therefore
corresponding to 1.175·ln (around 700 A);
• graphically, point 1 is obtained at the intersection of the vertical part of function
L and the horizontal segment (C0.4In-C1In) which connects the points relevant
to the same t1, taken from the curves with setting 0.4·ln and 1·ln;
• corresponding to point 2 (4000 A), the function S takes the place of function
L, as the trip time of function S is lower than the trip time of function L;
• in the same way as for point 2, for point 3 (8000 A) and beyond, function S is
substituted by function I.
A circuit-breaker in which the opening of the contacts occurs after the passage
of the peak of the short-circuit current, or in which the trip occurs with the
natural passage to zero, allows the system components to be subjected to
high stresses, of both thermal and dynamic type. To reduce these stresses,
current-limiting circuit-breakers have been designed (see Chapter 2.2 “Main
definitions”), which are able to start the opening operation before the short-circuit
current has reached its first peak, and to quickly extinguish the arc between the
contacts; the following diagram shows the shape of the waves of both the
prospective short-circuit current as well as of the limited short-circuit current.