2.8 Unbalanced Load Protection
217
7UT613/63x Manual
C53000-G1176-C160-2
In example, figure 2-97, the permanently permissible asymmetrical load amounts to
11 % of the machine internal current and the K-factor K = 20. As the relevant measur-
ing location for asymmetrical load is usually assigned to the side of the machine to be
protected, the setting can be effected directly under address
4034
FACTOR K
:
FACTOR K
= 20.
Figure 2-97
Example of a pre-defined asymmetrical load diagram
If, however, the asymmetrical load protection must be set in amps secondary during
operation, also the K-factor must be converted as it refers to the machine internal cur-
rent. The following applies:
Example:
Machine
I
N
= 483 A
I
2perm
= 11 % (salient-pole machine)
K-factor = 20 s
Current transformer
500 A/5 A
results in the setting value under address
4034
FACTOR K
:
The setting value
4035
T COOL DOWN
is defined as the time required by the protected
object to cool down from 100 % to 0 % during prior stress with permissible asymmet-
rical load
I2>
. If the machine manufacturer does not provide this information, the
setting value can be calculated by assuming an equal value for cool-down time and
Summary of Contents for SIPROTEC 7UT613 series
Page 16: ...Contents 16 7UT613 63x Manual C53000 G1176 C160 2 Literature 631 Glossary 623 Index 633 ...
Page 30: ...1 Introduction 30 7UT613 63x Manual C53000 G1176 C160 2 ...
Page 506: ...A Appendix 506 7UT613 63x Manual C53000 G1176 C160 2 7UT633 D E ...
Page 508: ...A Appendix 508 7UT613 63x Manual C53000 G1176 C160 2 7UT633 P Q ...
Page 510: ...A Appendix 510 7UT613 63x Manual C53000 G1176 C160 2 7UT635 D E ...
Page 512: ...A Appendix 512 7UT613 63x Manual C53000 G1176 C160 2 7UT635 P Q ...
Page 515: ...A 2 Terminal Assignments 515 7UT613 63x Manual C53000 G1176 C160 2 7UT633 B ...
Page 517: ...A 2 Terminal Assignments 517 7UT613 63x Manual C53000 G1176 C160 2 7UT633 N ...
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Page 622: ...A Appendix 622 7UT613 63x Manual C53000 G1176 C160 2 ...
Page 632: ...Literature 632 7UT613 63x Manual C53000 G1176 C160 2 ...