1SDH002031A1002 ECN000092998 Rev. B
SACE Tmax XT2
– XT4 | 43
IU Protection
Function
The protection is activated in the event of an imbalance between the currents detected. If the
detected imbalance exceeds the I6 threshold for a time greater than t6, the protection sends the
TRIP command.
The protection automatically cuts out in two cases:
The measurement of at least one current is greater than 6 In
The maximum current value of all phases is less than 0.3 In
To verify and simulate the trip times based on all the parameters, see:
Protection summary table with the operating characteristics (page 78)
Chart with tripping curve (page 87)
Parameters
Parameter
Description
Default
Enable
Enables/disables protection and availability on menu of the
parameters
OFF
Trip Enable
Activates/deactivates the open command: if disabled, the alarm
and the lapsing of the protection time are managed only as
information
OFF
Version
Enables the unbalance calculation method to be selected:
Old:
% Sbil = 100 x (I
max
- I
min
) / I
max
New:
% Sbil = 100 x = 100 x (
max I
mi
) / I
mi
NOTE:
max I
mi
: maximum deviation between measured
currents, calculated by comparing each current with the
average value; I
mi
: average value of the read currents
Old
Threshold I6
Defines the trip value that activates the protection.
The unbalance is expressed as a percentage value in a range:
2 % .. 90 %, with 1 % step
50 %
Time t6
This is the trip time of the protection; the value is expressed in
seconds, which are settable in a range: 0.5 s .. 60 s with 0.5 s step
5 s
Ekip M Touch
With Ekip M Touch IU protection is inhibited if the rms value of at least one of the phase currents
is less than 0.25 In.
Summary of Contents for SACE Tmax XT2
Page 84: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 84 L curve Ekip M Touch S curve t k I2 ...
Page 86: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 86 G curve t k I2 G curve t k ...
Page 87: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 87 IU curve UV curve UV2 curve ...
Page 88: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 88 OV curve OV2 curve VU curve ...
Page 89: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 89 S V curve S2 V curve RV curve ...
Page 90: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 90 UF curve UF2 curve OF curve OF2 curve ...
Page 91: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 91 RP curve D curve ...
Page 92: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 92 OQ curve OP curve ...
Page 93: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 93 UP curve RQ curve ...
Page 94: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 94 ROCOF curve R JAM curve R STALL ...
Page 95: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 95 UC curve ...
