Uv2 Protection - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

UV2 Protection

t
UV2
U15
t15
84 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
Continued from the previous page
D protection has Trip Enable, Directional Zone Selectivity, Startup Enable, see page 88.
Via Ekip Connect it is possible to access further parameters:
• Blocking functions, see page 72 for operation details.
• Trip only Forward: if it is activated, protection D manages opening commands only if forward direction
is detected
• Trip only Backward: if it is activated, protection D manages opening commands only if backward
direction is detected
Notes
By activating the directional D protection, the alarm that checks the phase sequence is automatically set
(it can however also be bypassed and activated manually): note that in the event of a cyclical sequence of
phases different from the set value, the directional protection inverts the reference direction in the case of a
fault whenever different from the expected one.
NOTE: the details of the phase sequence protection are available on page 79.
The behavior of the directional protection is influenced in the case of small overloads by the load type: in the
case of a capacitive load, to avoid the possibility of incorrect identification of the fault current direction, this
protection should be adjusted in relation to real fault conditions and not to overloads.
WARNING! Parameters and application notes are valid with protection trip units
updated to SW version 2.00 (or later versions).
Path
Main page - Menu - Advanced
Function
UV2 protection:
• It trips when the line-to-line voltage drops below the set threshold, like the UV protection.
• It is independent from UV 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 UV and trip
with UV2, or vice versa, or UV and UV2 both for signalling or trip).
If at least one line-to-line voltage drops below the activation threshold, the protection trips within a fixed time
set by the user.
v
Parameters
Here is a list of the available parameters:
Parameter
Enable
Threshold U15
Time t15
UV2 protection has StartUp enable, see page 88.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
Description
To activate/deactivate the protection.
It defines the voltage value below which the protection is activated (with
reference to the figure above, the threshold is the part of the curve parallel to
the y-axis).
It is represented both as an absolute value (Volts) and a relative value (Un,
nominal value defined on the trip unit).
The delay time between the exceeding of the U15 threshold and the sending of
the opening command (with reference to the figure above, the threshold is the
part of the curve parallel to the x-axis).
Ekip Touch protection trip unit | 11 - Hi-Touch protections
ABB | SACE Emax 2