ABB SACE Emax 2 Series Operating Instructions Manual page 88

Trip Only Forward and
Backward
Type of selectivity The zone selectivity inputs and certain of the outputs can be configured via service connector (via Ekip
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Continued from the previous page
Configuration
To correctly configure selectivity D in a ring system:
1. Connect the zone selectivity outputs of each device (example: DFin) to the selectivity input of the same
direction as the device immediately after (example: DFout).
2. Connect all the Szc of devices in the same network together.
Logic table
The table includes all cases in which, with zone selectivity enabled in the device, an alarm condition occurs
or a zone selectivity signal is received from another device.
The Forward output is activated if the fault direction coincides with the reference direction otherwise, if
it is in the opposite direction, the Backward output is activated (page 76)
Fault di-
Condition DFin Dbin Dfout Dbout
rection
Forward If < I7 Fw 0
Backward If < I7 Bw x
Forward If < I7 Fw 1
Backward If < I7 Bw x
Forward If > I7 Fw 0
Backward If > I7 Bw x
Forward If > I7 Fw 1
Backward If > I7 Bw x
NOTE: when zone selectivity is active and the direction of the fault cannot be established,
the unit trips by considering the first threshold to be exceeded between I7 Fw and I7 Bw,
without activating any output (DFout or Dbout).; if both the thresholds have been exceeded
(for example, if they have been set with the same value), the unit trips after the shortest
time between t7 Fw and t7 Bw.
D protection can be configured (if available and enabled) with 2 additional parameters via the service
connector (via Ekip Connect) or via system bus communication:
• Trip only Forward : if activated, D protection only controls open commands if forward direction is
detected
• Trip only Backward : if activated, D protection only controls open commands if backward direction
is detected.
faults in the opposite direction are only handled as alarm information.
Connect) or via system bus communication for protections S, S2, I, 2I, MCR, G, Gext, MDGF and D (if
available and enabled):
• Standard : operation as by zone selectivity standard logic (default configuration)
• Customized : the event that activates the zone selectivity input or output can be selected in this mode.
IMPORTANT: in the Customized configuration, the only zone selectivity activation event
is the one set and standard selectivity operation is therefore not active (changes should
only be made by expert technical personnel)
Tripping
time
x 0 x
No TRIP
0 x 0
x 1 x
No TRIP
1 x 1
x 1 x t7 Fw sel
0 x 1 t7 Bw sel
x 1 x t7 Fw
1 x 1 t7 Bw
9 - Additional protections and functions
ABB | SACE Emax 2
Remarks
Device not in alarm status
The device is not in the
alarm status, but sends the
selecitivity signal received to
the output of the reference
direction
The device is in the alarm
status and is the first to
detect the fault: trips within
time t7 Fw sel or t7 Bw sel
The device is in the alarm
status but is not the first to
detect the fault: trips within
time t7 Fw (or t7 Bw)
Ekip Touch - Protections