
Functions
2.6 Motor Protection
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
121
Figure 2-39
Example of a complete motor protection characteristic
Example:
Motor with the following data:
The setting for address
4402
Load Jam I>
as secondary value is calculated as follows:
The tripping delay time can remain at the default setting of 1 s. The warning threshold is set to 75% of the trip-
ping element (
4404
I Alarm
≡
0.95 A sec.).
The tripping delay time can remain at the default setting of 2 s.
In order to block the function during motor startup, the parameter
4406
T Start Blk.
is set to double startup
time (
T Start Blk.
= 2 · 8.5 s = 17 s).
Nominal voltage
V
Nom
= 6600 V
Nominal current
I
Nom
= 126 A
Long-term current rating
I
max
= 135 A
Startup duration
T
startmax.
= 8.5 s
Current transformer
I
NomCTprim
/
I
NomCTsec
= 200 A / 1 A
Содержание SIPROTEC 7SJ61
Страница 368: ...Technical Data 4 22 Dimensions SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 368 ...
Страница 436: ...Appendix A 11 Measured Values SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 436 ...
Страница 438: ...Literature SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 438 ...
Страница 450: ...Glossary SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 450 ...
Страница 454: ...Index SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 454 ...