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

S(V) Protection

t
I21
S2(V)
t21
98 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
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Function
S2(V) protection:
• It protects against short circuits, with a threshold sensitive to the value of the voltage.
• It is independent from S(V) protection: it is therefore possible to program thresholds and functions of the
two protections in order to have different installation solutions (for example: signalling with S(V) and trip
with S(V)2, or vice versa, or S(V) and S(V)2 both for signalling or trip).
When the activation threshold I21 is exceeded, the protection trips within a fixed time t21.
Following a voltage drop, the I21 threshold varies according to two different modes:
I
• Step Mode provides for variation in steps according to the Ul2 parameter.
• Linear Mode provides for dynamic variation base on the parameters Ul2 and Uh2.
I21
I21
Ks2 x I21
Figure 26
Parameters
It is possible to modify various parameters:
Parameter Description
Enable To activate/deactivate the protection.
It defines the variation dynamic of the current threshold, as represented in the two
Curve
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 I21
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 of the
level of I21:
• With voltage ≥ Ul2, the tripping threshold is I21.
Threshold Ul2
(Step) • With voltage < Ul2, the tripping threshold is Ks2 * I21.
It is represented both as an absolute value (Volts) and as a percentage (of Un,
nominal value defined on the trip unit).
With the curve in linear mode, it is the threshold that determines the variation of the
level of I21:
• With voltage ≥ Uh2, the tripping threshold is I21.
Threshold Uh2 e
• With voltage < Uh2 and > Ul2, the tripping threshold changes gradually.
Ul2 (Linear)
• With voltage ≤ Ul2, the tripping threshold is Ks2 * I21.
It is represented both as an absolute value (Volts) and as a percentage (of Un,
nominal value defined on the trip unit).
Constant for calculation of the variation of the I21 threshold. To be applied in
Threshold Ks2
different ways according to the type curve selected.
This is the delay time between the exceeding of the I21 threshold (determined by the
Time t21 voltage value read) and the sending of the opening command (in reference to the
curve, t21 affects the entire curve, shifting it along the y-axis).
S2(V) protection has StartUp enable, see page 71.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
I21
I21
Ks2 x I21
V
Ul2
Ekip Touch protection trip unit | 13 - G Hi-Touch protections
ABB | SACE Emax 2
Ul2 Uh2 V