Functions
2.8 Instantaneous High-Current Switch-onto-Fault Protection (SOTF)
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
96
Figure 2-36
Activation of the I>>> stage
I
>>>> stage
The
I
>>>> stage trips regardless of the position of the circuit breakers. Here, the currents are also numerically
filtered and the peak value of the currents is measured from the double setting value onwards. Figure 2-37
shows the logic diagram in the upper part.
Therefore, this stage is used when current grading is possible. This is possible with a small source impedance
and at the same time a high impedance of the protected object (an example can be found in the advice on
setting notes, Section 2.8.2).
The
I
>>>> stage is enabled automatically by the current-step monitoring
dI
/
dt
of the device for a duration of 50
ms. This stage operates separately for each phase.
Содержание SIPROTEC 7SD610
Страница 16: ...Contents SIPROTEC 7SD610 Manual C53000 G1176 C145 6 Release date 02 2011 16 ...
Страница 267: ...Functions 2 18 Command Processing SIPROTEC 7SD610 Manual C53000 G1176 C145 6 Release date 02 2011 267 ...
Страница 268: ...Functions 2 18 Command Processing SIPROTEC 7SD610 Manual C53000 G1176 C145 6 Release date 02 2011 268 ...
Страница 428: ...Appendix A 10 Measured Values SIPROTEC 7SD610 Manual C53000 G1176 C145 6 Release date 02 2011 428 ...
Страница 430: ...Literature SIPROTEC 7SD610 Manual C53000 G1176 C145 6 Release date 02 2011 430 ...
Страница 442: ...Glossary SIPROTEC 7SD610 Manual C53000 G1176 C145 6 Release date 02 2011 442 ...
Страница 448: ...Index SIPROTEC 7SD610 Manual C53000 G1176 C145 6 Release date 02 2011 448 ...