2 Functions
82
7UT613/63x Manual
C53000-G1176-C160-2
The same applies to the second overload protection that is assigned to a side under
address
444
THERM. O/L 2 AT
.
The overexcitation protection (section 2.11) is only possible for devices with voltage
connection, and requires a measuring voltage to be connected and declared in the to-
pology (section „Topology of the Protected Object“ under margin heading „Assignment
of Voltage Measuring Inputs“). It is not necessary to assign the protection function,
since it always evaluates the three-phase measuring voltage at the voltage input, and
the frequency derived from it. The same applies to the undervoltage protection, the ov-
ervoltage protection and the frequency protection.
When using the circuit breaker failure protection (section 2.17) (address
470
BREAKER FAIL.AT
) please make sure that the assignment of this protection function
corresponds to that side or measuring location whose current actually flows through
the circuit breaker to be monitored. In the example shown in Figure 2-2, the assign-
ment must be set in address
BREAKER FAIL.AT
to
Side 1
if you want to monitor
the circuit breaker of the high-voltage side, since both currents flow through the
breaker (via M1 and M2). If on the other hand you want to monitor the circuit breaker
of the cable feeder, you set address
BREAKER FAIL.AT
to
Measuring loc.5
.
When assigning the circuit breaker failure protection function, make sure that the
breaker auxiliary contacts or feedback information are correctly configured and as-
signed.
If you do not wish to assign any measuring location or side to the circuit breaker failure
protection because you want only the breaker position to be processed, set
BREAKER
FAIL.AT
to
Ext. switchg. 1
. In this case, the protection handles only the breaker
position but not any current flow for its operation. This allows even to monitor a circuit
breaker the current of which is not connected to the device. But you have to ensure
that the feedback information of this breaker is correctly connected and configured.
With the second circuit breaker failure protection an additional circuit breaker can be
monitored. The aspects regarding the assignment in address
471
BREAKER
FAIL2AT
correspond with those for the first circuit breaker failure protection.
Further 1-phase
Protection Func-
tions
The 1-phase protection functions evaluate the 1-phase measuring current of 1-phase
additional measuring input. It is irrelevant in this context whether the connect current
belongs to the main protected object or not. Only the current connected to the addi-
tional measuring input is decisive.
The device must now be informed which current is to be evaluated by the 1-phase pro-
tection functions.
Address
424
DMT/IDMT E AT
assigns the time overcurrent protection for earth
current (section 2.5) to a 1-phase additional measuring input. In most cases this will
be the current flowing in the neutral leads of an earthed winding, measured between
the starpoint and the earth electrode. In figure 2-2 the auxiliary measuring location X3
would be a good choice; so you set here
AuxiliaryCT IX3
. As this protection func-
tion is autonomous, i.e. independent of any other protection function, any 1-phase ad-
ditional measuring input can be used. This requires, however, that it is not a high-sen-
sitivity measuring input and, of course, that it is connected. Please note also that the
earth overcurrent protection will receive from the auxiliary measuring location as-
signed here not only its measured value, but also circuit breaker information (current
flow and manual-close detection).
The second earth overcurrent protection can be assigned to another single-phase
measuring location according to the same aspects under address
438
DMT/IDMT E2
AT
.
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 ...
Page 519: ...A 2 Terminal Assignments 519 7UT613 63x Manual C53000 G1176 C160 2 7UT635 B ...
Page 521: ...A 2 Terminal Assignments 521 7UT613 63x Manual C53000 G1176 C160 2 7UT635 N ...
Page 622: ...A Appendix 622 7UT613 63x Manual C53000 G1176 C160 2 ...
Page 632: ...Literature 632 7UT613 63x Manual C53000 G1176 C160 2 ...