ABB SACE Tmax XT2 User Manual page 71

Zone selectivity Configuration
S, S2, and G [2] For a correct configuration of the selectivity network of one or more protections:
1. Connect the zone selectivity outputs of the same type (example: Szo) of the devices
2. Connect all the Szcs of the devices of the same network to each other.
3. The time t2 must be configured to a value greater than or equal to t2 sel + 50 ms, excluding
Logical table
The table shows all cases in which – with zone selectivity enabled on the device – there is an
alarm condition or a zone selectivity signal coming from another device.
Condition
If < I2
If < I2
If > I2
If > I2
D Zone selectivity Preface
The function, which can be activated for the D protection (if available and enabled), allows
connecting several devices belonging to the same system, including Ekip Touch, to better
manage the trip commands in case of D protection.
It is particularly useful in ring and grid systems where it is essential to define both the area and
the direction of the flow that powers the malfunction.
The function allows coordinating the devices so that in the event of a malfunction:


1SDH002031A1002 ECN000092998
belonging to the same zone to the zone selectivity input of the device immediately upstream
(example: Szi).
the device that is furthest downstream in its network.
NOTES:

The table shows the case of S protection but it is also valid for the other
protections – G and S2 – each with their respective connections

If the protection selectivities that share the same connections are active at the
same time (example: S and S2), the inputs/outputs are managed with OR logic.
Carefully configure the parameters of the protections to avoid unwanted openings
Szi Szo Tripping time
0 0 No TRIP
1 1 No TRIP
0 1 t2 sel
1 1 t2
The device closest to the malfunction is triggered
The other devices are blocked for a programmable time
NOTES:

The connection is possible between ABB devices that have the zone selectivity
function

For correct use of the D selectivity function disable the zone selectivity of the S,
S2 and G protections
Rev. B
Comments
The device is not in alarm status
The device is not in alarm status but transmits
the selectivity signal received from the device
upstream
The device is in alarm status and is the first to
detect the fault: trips in the time t2 sel
The device is in alarm status but is not the first
to detect the fault: trips in the time t2
SACE Tmax XT2 – XT4 | 71