Page 76 - MCCB-XT5

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Configuration
To correctly configure the selectivity network of one or more protections:
1. Connect zone selectivity outputs of the same type (example: Szo) of devices belonging to the same
zone, to the zone selectivity input of the device immediately upstream (example: Szi).
2. Connect all the Szc of devices in the same network together.
3. Time t2 must be configured at t2 sel + 50 ms or more, with the exclusion of the device further along
its network.
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.
NOTES:

• the table gives the S protection cases, but is also valid for the other protections: G, S2, I, 2I
and MCR, each with its respective connections
• if the selectivities of protections that share the same connections are active at the same
time (example: S, S2, I, 2I and MCR), the inputs/outputs are managed with OR logic
Tripping
Condition Szi Szo Remarks
time
If < I2 0 0 No TRIP TRIP Il device not in alarm status
The device is not in the alarm status, but sends the
If < I2 1 1 No TRIP
selecitivity signal received from the device upstream
The device is in the alarm status and is the first to
If > I2 0 1 t2 sel (1)
detect the fault: trips within time t2 sel (1)
The device is in the alarm status but is not the first
If > I2 1 1 t2 (2)
to detect the fault: trips within time t2 (2)

D zone selectivity Protection Foreword
This function, which can be activated for D protection (if available and enabled), enables devices
belonging to the same installation (including Ekip Touch) to be connected together so as to handle the
trip commands in a better way in the case of D protection.
It is especially useful in ring and grid type systems where, besides the zone, it is essential to also define
the direction of the power flow that supplies the fault.
The function allows the devices to be coordinated so that, if a fault occurs:
• The device nearest to the fault trips
• The other devices are blocked for a programmable time
NOTES:
• connection can be made between ABB devices that have the zone selectivity function
• disable the zone selectivities of protections S, S2, I, 2I, MCR and G to correctly use the
selectivity D function
Characteristics
Ekip Touch has five selectivity connections, located on the rear connectors of the CB:
Name Type Description Denomintion for D
Szi Input Forward direction selectivity input DFin
Szo Output Forward direction selectivity output DFout
Gzi Input Backward direction selectivity input Dbin
Gzo Output Backward direction selectivity output Dbout
Common connection of selectivity
Szc Common SZc
network

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