Page 69 - Sace Emax 2 Catalogue

SOFT WARE FUNCTIONS 4/5

With Adaptive protections when there is a Utility Benefits
outage, circuit breaker A opens and B closes in or- Thanks to Emax 2 it is possible to have two sets
der to have operation in islanded condition. In or- of settings implemented in a single device. As a
der to still guarantee selectivity, an alternate set of result, the following benefits are guaranteed:
protection settings is required. Adding Emax 2 • Overcurrent protection and selectivity 100%
adaptive protections to circuit breaker C ensure this guaranteed both in grid-connected and is- 04
behaviour. The second protection setting is opti- landed condition
mized for the characteristics of the local generator • The service continuity is is granted just adding
ensuring the incoming supply and load side switch- a single unit in the switchboard in every plant
ing devices will remain selectively coordinated. condition
With reference to Figure 1: • Ease of use, thanks to the Ekip Connect soft-
• Circuit breaker A is open ware which allows an immediate and intuitive
• Circuit breaker B is closed commissioning phase.
• Circuit breakers C are closed and the protection
thresholds move automatically to “Set B” For further information, please refer to the White
• Circuit breakers D are closed Paper “Emax 2, all-in-one innovation – Adaptive
• Circuit breaker E is open protections” (1SDC007116G0201).
• Circuit breaker QS1 is closed
• No priority loads can be disconnected using an-
other functionality of Emax 2 units (see next
paragraph).

The following Figure shows how it is possible to
switch to a set of parameters which guarantees
selective coordination between circuit breakers C
and B by means of the “Adaptive protections“
function embedded in the trip unit of the circuit-
breaker C.

10 3 s 10 3 s
A B
10 2 s 10 2 s
10s 10s
C C
D D
1s 1s
10 -1 s 10 -1 s
10 -2 s 10 -2 s
10 -3 s 10 -3 s
1kA 10kA 10 2 kA 10 3 kA 1kA 10kA 10 2 kA 10 3 kA
Time-Current curves Time-Current curves

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Fig. 2 Fig. 3