By ABB SACE
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Additional info for ABB handbook protection and control devices
For fault current values higher than 1600 A, the circuit-breaker trips instantaneously through magnetic protection. Introduction The following figures show the curves of the single protection functions available in the electronic releases. The setting ranges and resolution are referred to setting operations to be carried out locally. 2 x I1 A= 3s; B= 6s; C= 12s; D= 18s (@ 6 x I1) A= 3s; B= 6s; C= 12s; D= 18s (@ 6 x I1) for T4 In = 320 A and T5 In = 630 A → t1 = 12s. 5 – 2 – 4 – 6 – 8 – 10 – 12 – OFF) x In Here below the tolerances: I2 ± 10 % (T4-T5) PR221 ± 10 % (up to 2 x In) ± 20 % (over 2 x In) PR222 ± 10 % PR211 ± 10 % PR212 101 1 I3 ± 10 % (T4-T5) ± 20 % (T2) ± 10 % for T4 In = 320 A and T5 In = 630 A →I3 max = 10 x In Here below the tolerances: Tripping time: ≤ 25 ms ≤ 25 ms ± 20 % ≤ 25 ms PR111 ± 20 % 35 ms up to 3 x In 30 ms over 3 x In PR112 PR113 ± 10 % up to 4 x In ± 15 % over 4 x In ≤ 25 ms The given tolerances are valid only if the release is self-supplied in steady state condition with two-phase or three-phase power supply.
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. 1 of the Standard “Circuits of ASSEMBLIES which are exempted from the verification of the short-circuit withstand strength” states that: 1 1 10 102 103 Irms [kA] “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.
IEC 60255-3 The following three curves refer to the protection function L complying with Std. IEC 60255-3 and integrate the standard one; they are applicable in coordination with fuses and MV circuit-breakers. 2 Trip curves 3 General characteristics 3 General characteristics Trip curve electronic releases PR113/P release – Other protection functions The following curves refer to the particular protection functions provided for PR113/P. 3 Limitation curves 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.