S(V) Protection - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

S(V) Protection

t
I20
S(V)
t20
112 | © 2013 ABB | 1SDH001000R0002 - L7804
Path
Main page - Menu - Advanced protections
Function
The protection S(V) protects against short circuits, with a threshold sensitive to the value of
the voltage.
The I20 threshold, as a result of a voltage drop, decreases in steps or in linear fashion,
according to two different modes:
• Step Mode provides for variation in steps according to the Ul parameter.
• Linear Mode provides for dynamic variation base on the parameters Ul and Uh.
I
I20
I20
Ks x I20
Parameters
It is possible to modify various parameters:
Parameter Description
Enabling Activates/deactivates the protection.
Defines the variation dynamic of the current threshold, as represented
Curves
in the two diagrams above.
It defines the current value that if exceeded activates the protection (in
Current reference to the curve, it is the part parallel to the ordinate).
Threshold (I20) It is represented both as an absolute value (Ampere) and as a relative
value (In, nominal value defined by the Rating Plug).
With the curve in step mode, it is the threshold that determines the
variation in the level of I20:
UI Threshold
(Step)
It is represented both as an absolute value (Volts) and as a percentage
(of Vn, a nominal value defined on the release).
With the curve in linear mode, it is the threshold that determines the
variation in the level of I20:
Uh and UI
threshold
(Linear)
It is represented both as an absolute value (Volts) and as a percentage
(of Vn, a nominal value defined on the release).
Constant for calculation of the variation of the I20 threshold. To be
Ks threshold
applied in different ways according to the type curve selected.
This is the delay time between the exceeding of the I20 threshold
(determined by the voltage value read) and the sending of the opening
Time (t20)
command (in reference to the curve, t20 affects the entire curve,
moving it along the vertical axis).
The protection S (V) has Trip Enable, see page 93.
V
Ul
• With voltage ≥ Ul, the tripping threshold is I20.
• With voltage < Ul, the tripping threshold is Ks * I20.
• With voltage ≥ Uh, the tripping threshold is I20.
• With voltage < Uh and > Ul, the tripping threshold changes gradually.
• With voltage ≤ Ul, the tripping threshold is Ks * I20
I20
I20
Ks x I20
UI
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ABB | SACE Emax 2
Uh V