ABB | SACE Tmax XT
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Protections | 9 - Voltage Advanced protections
9 - 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
S2(V)
(1)
Short-circuit with voltammetric control
RV
Residual voltage
(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
I20
t
t20
I
S(V)
Function
S(V) protection protects against short circuits, with a threshold sensitive to the value of the voltage.
If the current of one or more phases exceeds threshold I20 for longer than time t20, the protection activates
and sends a TRIP command.
Threshold I20, after a voltage drop, varies in two different modes:
•
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.
V
I20
Ks x I20
Uh
UI
V
I20
I20
I20
Ks x I20
Ul
Figure 27
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 88)
• the graph with trip curve (page 101)
Parameters
Parameter
Description
Default
Enable
Activates/deactivates the protection and its availability in the
parameters menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled,
the alarm and exceedance of protection time are only managed as
information
OFF
Curve
Allows the operating mode, Step or Lin, to be selected
Scal
Threshold I20
Establishes the value that activates the protection and contributes
towards calculating the trip time.
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
1 In
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