SOFTWARE FUNCT IONS
4/5
Benefits Emax 2 makes it possible to have two sets of set- tings implemented in a single device. As a result, the following benefits are provided: • Overcurrent protection and selectivity provided both in grid-connected and islanded condition • Service continuity is provided by the addiction of a single unit in the switchboard in every plant condition • Ease of use, due to Ekip Connect software which allows an immediate and intuitive commissioning phase. For further information, please refer to the White Paper “Emax 2, all-in-one innovation – Adaptive protections” (1SDC007116G0201).
With Adaptive protections when there is a Utility outage, circuit breaker A opens and B closes in or- der to have operation in islanded condition. In order to still provide selectivity, an alternate set of protec- tion settings is required. Adding Emax 2 adaptive protections to circuit breaker C helps ensure this be- havior. The second protection setting is optimized for the characteristics of the local generator helping to ensure the incoming supply and load side switching devices will remain selectively coordinated. Figure 1 illustrates the operation: • Circuit breaker A is open • Circuit breaker B is closed • Circuit breakers C are closed and the protection thresholds move automatically to “Set B” • Circuit breakers D are closed • Circuit breaker E is open • Circuit breaker QS1 is closed • No priority loads can be disconnected using an- other functionality of Emax 2 units (see Load Shedding). The following figures shows switching to a set of parameters which provides 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
B
A
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
10 2 kA
10 3 kA
10 2 kA
10 3 kA
1kA
10kA
1kA
10kA
Time-Current curves
Time-Current curves
— Fig. 2
— Fig. 3
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