ABB SACE Emax E1.2, Operating Instructions For The Design Engineer

Page: 89 / 311

ABB | SACE Emax 2
Ekip Touch protection trip unit | 11 - Hi-Touch protections 83 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
D Protection
I7
t
t7fw
I
D
t7bw
Path
Main page - Menu - Advanced
Function
D protection protects against selective directional short circuit.
Once the activation threshold has been exceeded, the protection trips within a fixed time determined by the
direction of the fault, t7fw in the case of forward direction and T7bw in the case of backward direction.
Operating principle
The direction of the fault current detected is compared with the reference direction for the fault
current (forward direction).
This reference direction matches the set
power flow
value in nominal conditions, provided that the
phase
sequence has been set correctly (cyclic direction of the phases).
Cyclic direction of
the phases (Set)
Power flow
Cyclic direction of
the phases (Real)
Reference direction for
the fault current
(forward direction).
123 Top -> Bottom 123 Top -> Bottom
123 Bottom -> Top 123 Bottom -> Top
123 Top -> Bottom 321 Bottom -> Top
123 Bottom -> Top 321 Top -> Bottom
321 Top -> Bottom 123 Bottom -> Top
321 Bottom -> Top 123 Top -> Bottom
321 Top -> Bottom 321 Top -> Bottom
321 Bottom -> Top 321 Bottom -> Top
NOTE: The flow of power parameter is described under the Ekip Measuring Pro module, on
page 179 , while the phase sequence on page 79 .
Parameters
It is possible to modify various parameters:
Parameter Description
Enable To activate/deactivate the protection.
Threshold I7 Bw
It defines the current value that activates the protection when exceeded (with
reference to the figure above, the threshold is the part of the curve parallel to
the y-axis), in the case of forward direction.
It is represented both as an absolute value (Ampere) and as a relative value (In,
nominal value defined by the Rating Plug)
Threshold I7 Fw
It defines the current value that activates the protection when exceeded (with
reference to the figure above, the threshold is the part of the curve parallel to
the y-axis), in the case of backward direction.
It is represented both as an absolute value (Ampere) and as a relative value (In,
nominal value defined by the Rating Plug)
Time t7 Fw
This is the delay time between the exceeding of the I7 threshold and the
sending of the opening command, in the case of forward direction.
Time t7 Bw
This is the delay time between the exceeding of the I7 threshold and the
sending of the opening command, in the case of backward direction.
Direction Min Angle
The direction of the fault is calculated by the trip unit according to the phase
difference angle between the reactive and apparent powers measured:
when the phase-difference becomes greater than the parameter
Min Angle
Direction
set, the trip unit considers the direction of the fault to have been
identified.
NOTE: There are 15 preset values available, in a range from 3.6° to
69.6°.
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