ABB XT7, Руководство по эксплуатации и обслуживанию

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ABB | SACE Tmax XT
76 | © 2020 ABB | 1SDH001821A1002 - ECN000135670 Protections | 15 - Additional protections and functions
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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,
MCR, Gext and MDGF, 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
Condition Szi Szo Tripping time Remarks
If < I2 0 0 No TRIP TRIP Il device not in alarm status
If < I2 1 1 No TRIP
The device is not in the alarm status, but sends the
selecitivity signal received from the device upstream
If > I2 0 1 t2 sel (1)
The device is in the alarm status and is the first to detect
the fault: trips within time t2 sel
(1)
If > I2 1 1 t2 (2)
The device is in the alarm status but is not the first 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, G, Gext and MDGF to correctly
use the selectivity D function
Characteristics
Ekip Touch has five selectivity connections, located on the upper terminal box 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
Szc Common Common connection of selectivity network SZc
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