1SDH002031A1002 ECN000092998 Rev. B
SACE Tmax XT2
– XT4 | 52
S2(V) Protection
Function
Like the S(V) protection, the S2(V) Protection protects against short circuits, with a threshold
sensitive to the voltage value.
It is independent of S(V) protection and it is therefore possible to program thresholds and
functions of the two protections to take advantage of different system solutions (example:
signaling with S(V) and opening command with S2(V) or vice versa, or S(V) and S2(V) both for
signaling or for tripping).
If the current of one or more phases exceeds the I21 threshold for a time greater than t21, the
protection is activated and sends the TRIP command.
Following a voltage drop, the I21 threshold varies according to two different modes:
Scal
(step) provides a step variation based on the parameters Ul2 and Ks2.
Lin
(linear) provides a dynamic variation based on the parameters Ul2, Uh2, and Ks2.
Figure 21
To verify and simulate the trip times based on all the parameters, see:
Protection summary table with the formulas for calculations (page 79)
Chart with tripping curve (page 89)
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
Function
Enables the operating mode Scal or Lin to be selected:
Scal
Threshold
I21
Defines the value that activates protection and contributes to
calculating trip time.
The value is expressed both as an absolute value (Ampere) and as
a relative value (In), settable in a range:
0.6 In .. 10In with 0.1 In step
1 In
Threshold
Ul2
This voltage determines the change of the trip threshold 121, with different
behaviour according to the selected mode:
Mod
Voltage read
Trip threshold
Scal
< Ul2
Ks2 x I21
Ul2
I21
Lin
< Ul2
Ks x I21
Ul2 (and < Uh2)
𝐼21 𝑥 (1 − 𝐾𝑠2) 𝑥 (𝑈
𝑚𝑖𝑠
− 𝑈ℎ2)
𝑈ℎ2 − 𝑈𝑙2
+ 𝐼21
The value is expressed both as an absolute value (Volt) and as a relative
value (Un), settable in a range: 0.2 Un .. 1 Un with 0.01 Un step
1 Un
Scal
Lin
Содержание SACE Tmax XT2
Страница 82: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 82 L curve IEC 60255 151 SI L curve IEC 60255 151 VI ...
Страница 83: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 83 L curve IEC 60255 151 EI L curve t k I4 ...
Страница 84: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 84 L curve Ekip M Touch S curve t k I2 ...
Страница 85: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 85 S curve t k Curve S2 I curve MCR curve 2I curve ...
Страница 86: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 86 G curve t k I2 G curve t k ...
Страница 87: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 87 IU curve UV curve UV2 curve ...
Страница 88: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 88 OV curve OV2 curve VU curve ...
Страница 89: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 89 S V curve S2 V curve RV curve ...
Страница 90: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 90 UF curve UF2 curve OF curve OF2 curve ...
Страница 91: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 91 RP curve D curve ...
Страница 92: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 92 OQ curve OP curve ...
Страница 93: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 93 UP curve RQ curve ...
Страница 94: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 94 ROCOF curve R JAM curve R STALL ...
Страница 95: ...1SDH002031A1002 ECN000092998 Rev B SACE Tmax XT2 XT4 95 UC curve ...
Страница 207: ...1SDH002031A1002 ECN000092998 Rev B ...