Page 40 - MCCB-XT2-XT4
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ABB | SACE Tmax XT

                      S2 Protection Function
                                    S2 protection functions in the same way as S protection: if the current of one or more phases exceeds
                  t                 threshold I5 for longer than time t5, the protection activates and sends a TRIP command.
                       I5     S2
                                           NOTE: unlike S protection, S2 protection only has one fixed time trip curve and has no
                                           thermal memory
                            t5      It is independent of S protection, thus thresholds and functions of the two protections can be programmed
                                    so as to take advantage of different plant solutions (example: signaling with S and open command with
                                  I  S2 or vice versa, or both S and S2 for signaling or tripping).
                                    To check and simulate the trip times in relation to all the parameters, please consult:
                                     •  the summary table of the protections with the calculation formulas (page 75)
                                     •  the graph with trip curve (page 82)
                                     Parameter    Description                                         Default
                                                  Activates/deactivates the protection and its availability in the
                                     Enable                                                           OFF
                                                  parameters menu.
                                                  Activates/deactivates transmission of the open command. if
                                     Trip Enable  disabled, the alarm and exceedance of protection time are only   ON
                                                  managed as information.
                                                  Establishes the value that activates the protection and
                                                  contributes towards calculating the trip time.
                                     Threshold I5                                                     2 In
                                                  The value is given as both absolute value (A) and relative value (In)
                                                  and can be set within the range: 0.6 In to 10 In, in 0.1 In steps
                                                  This is the trip time of the protection.
                                     Time t5      The value is given in seconds and can be set within the range:   0,05 s
                                                  0.05 s to 0.4 s, in 0.01 s steps
                                                  Activates/deactivates the function and selectivity time availability
                                                  on the display (page 67)
                                                       NOTE: if at least two of the selectivity S, S2, I, 2I and MCR
                                     ZoneSelectivity                                                  OFF
                                                     are enabled, the input and output are shared with the OR
                                                     function; it is sufficient that even a selectivity is activated to
                                                     stimulate inputs and outputs
                                                  This is the trip time of the protection with the zone selectivity
                                                  function activated and selectivity input not present (page 67)
                                     Selectivity time                                                 0,04 s
                                                  The value is given in seconds and can be set within the range:
                                                  0.04 s to 0.2 s, in 0.01 s steps
                                                  Activates/deactivates the function and availability of the
                                     StartUp enable                                                   OFF
                                                  associated parameters on the display (page 70)
                                                  Protection threshold valid during Startup time, in the conditions
                                     StartUp      in which the function is activated (page 70)        2 In
                                     Threshold    The value is given as both absolute value (A) and relative value (In)
                                                  and can be set within the range: 0.6 In to 10 In, in 0.1 In steps
                                                  This is the time for which the StartUp threshold remains
                                                  activated, as calculated from the moment the activation
                                     StartUp Time  Threshold is exceeded (page 70)                    0.1 s
                                                  The value is given in seconds and can be set within the range: 0.1
                                                  s to 30 s, in 0.01 s steps

                                    Limitations and additional functions
                                     •  threshold I5 must be higher than threshold I1 (if S2 protection is activated)
                                     •  the block functions and type of selectivity can also be accessed by means of the service connector
                                       (via Ekip Connect) or communication via system bus (page 69)
                                     •  with CB in UL standard configuration, the maximum value of t5 is 400 ms



















       38 | © 2022 ABB |  1SDH002031A1002 - ECN000212994                               Protections | 2 - Standard Protections
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