ABB SACE Tmax XT4 - Page 51

1SDH002031A1002 ECN000092998 Rev. B SACE Tmax XT2 – XT4 | 51
S(V) Protection
[2]
Parameter
Description
Default
Threshold Ul
This voltage determines the change of the trip threshold I20, with different
behaviour according to selective mode:
Mod
Voltage read
Trip threshold
Scal
< Ul
Ks x I20
 Ul
I20
Lin
< Ul
Ks x I20
 Ul (and < Uh)
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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
Threshold Uh
The parameter is shown with a Lin curve and helps to calculate the trip
threshold I21:
Mod
Voltage read
Trip threshold
Lin
< Uh (and  Ul)
The threshold varies gradually (see
above)
 Uh
I20
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
Threshold
Ks
Threshold I20 calculation constant.
The value is expressed as a percentage value of the threshold I20,
which is settable in a range: 0.1 I20 .. 1 I20 with 0.01 step
0.6 I20
Time t20
This is the trip time of the protection.
The value is expressed in seconds, which are settable in a range:
0.05 s .. 30 s, with 0.01 s step
0.1 s
Constraints, limitations, and additional functions
From the service connector (with Ekip Connect) or with system bus communication it is also
possible to access the block functions, see page70.