Page 67 - Sace Emax 2 Manual for design engineers

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ABB | SACE Emax 2
4 - Voltage Advanced protections

List The Advanced Voltage protections, available by default for the Ekip G Touch and Ekip G Hi-Touch models and
configurable in the remaining models as additional SW package, are:
Name Type of protection Page
S(V) Short-circuit with voltammetric control 65
S2(V) (1) Short-circuit with voltammetric control 66
RV Residual voltage 68

(1) S2(V) protection is not available by default with Ekip G Touch. However, it can be integrated by requesting
the relative SW package

S(V) Protection Function
S(V) protection protects against short circuits, with a threshold sensitive to the value of the voltage.
t If the current of one or more phases exceeds threshold I20 for longer than time t20, the protection activates
I20 S(V) and sends a TRIP command.
Threshold I20, after a voltage drop, varies in two different modes:
t20 • Step provides for a stepped variation, depending on parameters Ul and Ks.
• Lin (linear) provides for a dynamic variation, depending on parameters Ul, Uh and Ks.
I I I

I20 I20

Ks x I20 Ks x I20

Ul V UI Uh V

Figure 22
To check and simulate the trip times in relation to all the parameters, please consult:
• the summary table of the protections with the calculation formulas (page 93)
• the graph with trip curve (page 104)
Parameters
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as OFF
information
Curve Allows the operating mode, Step or Lin, to be selected Scal
Establishes the value that activates the protection and contributes
towards calculating the trip time.
Threshold I20 1 In
The value is given as both absolute value (Amperes) and relative value
(In) and can be set within the range: 0.6 In to 10 In, in 0.1 In steps

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