Page 82 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
9 - Additional protections and functions

Introduction Some protections have additional functions which extend their characteristics and performance:
Name Type of protection Page
Thermal Memory overheating of the cables 80
Zone selectivity management of trip commands in a network of circuit-breakers 80
Blocks blocking of protection on the basis of programmable events 83
Startup different thresholds on the basis of monitoring thresholds 83
Current thresholds Current control with programmable thresholds 88
Programmable Programmable commands with trip unit events or statuses 89
Commands

Installation of accessory modules allows the respective functions to be activated:
Name Type of protection Page
Gext External earth fault with adjustable delay 84
Rc Residual current 87
Synchrocheck Synchronism between two independent voltage sources 89
MDGF Modified differential ground fault 85

Thermal Memory Protection The function, which is available for L and S protections, allows overheating in the cables connected to the
circuit-breaker to be prevented: in the case of trips within brief intervals, the unit considers the time between
commands and the entity of the faults so as to reduce opening time.

IMPORTANT: for the S protection the function can be activated if the selected curve
is time-dependent.

NOTE: the function also reduces the trip time in the case of overloads which have
not led to the open command (longer than 100ms)

S, S2, I, G zone selectivity The function, which can be activated for S, S2, I, G, Gext and MDGF protections (if available and enabled),
Protection, Gext, MDGF allows several devices belonging to the same installation (including Ekip Touch) to be interconnected, so as
to handle trip commands in the best possible way in the case of S, S2, I, G, Gext and MDGF protections.
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
NOTE: connection can be made between ABB devices that have the zone selectivity function
Characteristics
Ekip Touch has five selectivity connections, located on the rear connectors of the CB:
Name Type Description Connection
Szi Input S, S2 and I protection selecitivity input From devices on the load side
Szo Output S, S2 and I protection selecitivity output To devices on the supply side
G, Gext and MDGF protection selectivity
Gzi Input From devices on the load side
input
G, Gext and MDGF protection selectivity
Gzo Output To devices on the supply side
output
Szc Common Common connection of selectivity network The entire selectivity network

Continued on the next page

80 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Touch - Protections | 9 - Additional protections and functions