ABB | SACE Tmax XT
58 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Protections | 9 - Voltage Advanced protections
Continued from the previous page
Parameters
Parameter
Description
Default
Enable
Activates/deactivates the protection and its availability in the
parameters menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled,
the alarm and exceedance of protection time are only managed as
information
OFF
Curve
Allows the operating mode, Step or Lin, to be selected
Scal
Threshold I21
Establishes the value that activates the protection and contributes
towards calculating the trip time.
The value is given as both absolute value (Amperes) and relative value
(In) and can be set within the range: 0.6 In to 10 In, in 0.1 In steps
1 In
Threshold Ul2
It is the voltage that determines the change in trip threshold I21; the
behavior differs, depending on the mode selected
(1)
The value is given as both absolute value (Volts) and relative value (Un)
and can be set within the range: 0.2 Un to 1 Un in 0.01 Un steps
1 Un
Threshold Uh2
The parameter is shown by the Lin curve and contributes towards I21
trip threshold calculation:
• with voltage reading < Uh2 (and
≥
Ul2), the threshold changes
gradually
(1)
• with voltage reading
≥
Uh2, the threshold is I21
The value is given as both absolute value (Volts) and relative value (Un)
and can be set within the range: 0.2 Un to 1 Un in 0.01 Un steps
1 Un
Threshold Ks2
I21 threshold calculation constant.
The value is given as percentage of threshold I21 and can be set
within the range: 0.1 I21 to 1 I21, in 0.01 steps
0,6 I21
Time t20
This is the trip time of the protection.
The value is given in seconds and can be set within the range: 0.05 s
to 30 s, in 0.01 s steps
0.1 s
(1)
Trip threshold (depending on the operating curve)
Mode
Voltage reading
Trip threshold
Scal
< UI2
Ks2 x I21
≥
UI2
I21
Lin
< UIs
Ks2 x I21
≥
Ul2 (e < Uh2)
((I21 x ( 1 - Ks2 ) x ( U
mis
- Uh2 ) ) / (Uh2 - Ul2) ) + I21
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 78).
