ABB SACE Tmax XT7 Operation And Maintenance Manual page 60

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