S(V) Protection - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

S(V) Protection

t
I20
S(V)
t20
91 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
Path
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Function
S(V) protection protects against short circuits, with a threshold sensitive to the value of the voltage.
Following a voltage drop, the I20 threshold varies 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 Ul and Uh parameters.
I20
I
I20
Ks x I20
Figure 22
Parameters
It is possible to modify various parameters:
Parameter Description
Enable
To activate/deactivate the protection.
Allows you to choose the variation dynamic of the current threshold, as represented
Curve
in the two diagrams above.
It defines the current value that activates the protection when exceeded (with
reference to the curve, it is the part parallel to the y-axis).
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 • With voltage ≥ Ul, the tripping threshold is I20.
(Step) • With voltage < Ul, the tripping threshold is Ks * I20.
It is represented both as an absolute value (Volts) and as a percentage (%Un, with
Un nominal value defined on the trip unit).
With the curve in linear mode, it is the threshold that determines the variation in the
level of I20:
• With voltage ≥ Uh, the tripping threshold is I20.
Threshold Uh e Ul
• With voltage < Uh and > Ul, the tripping threshold changes gradually.
(Linear)
• With voltage ≤ Ul, the tripping threshold is Ks * I20
It is represented both as an absolute value (Volts) and as a percentage (%Un, with
Un nominal value defined on the trip unit).
Constant for calculation of the variation of the I20 threshold. To be applied in
Ks threshold
different ways according to the type curve selected.
This is the delay time between the exceeding of the I20 threshold (determined by the
Time t20
voltage value read) and the sending of the opening command (with reference to the
curve, t20 affects the entire curve, shifting it along the y-axis).
S(V) protection has StartUp enable, see page 71.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
I20
I20
Ks x I20
V
Ul
Ekip Touch protection trip unit | 12 - G Touch protections
ABB | SACE Emax 2
UI
Uh V