2.1 General
83
7UT613/63x Manual
C53000-G1176-C160-2
Address 427 DMT 1PHASE AT assigns the single-phase time overcurrent protection
(section 2.7). This protection function is mainly used for high-sensitivity current mea-
surement, e.g. for tank leakage protection or high-impedance differential protection.
Therefore a high-sensitivity 1-phase additional measuring input is particularly suited
for it. In figure 2-2 this would be the auxiliary measuring location X4; so you set this
address to AuxiliaryCT IX4. However, it is also possible to assign this protection
function to any other additional measuring input used, regardless of its sensitivity.
2.1.4.4 Circuit Breaker Data
Circuit Breaker
Status
Various protection and ancillary functions require information on the status of the
circuit breaker for faultless operation. Command processing makes also use of the
feedback information from the switching devices.
If, for instance, the circuit breaker failure protection is used to monitor the reaction of
a specific circuit breaker (CB), the protection device must know the measuring location
at which the current flowing through the breaker is acquired, and the binary inputs
which provide information on the breaker status. During the configuration of the binary
inputs you merely assigned the (physical) binary inputs to the (logic) functions. The
device, however, must also know to which measuring location(s) the circuit breaker is
assigned.
The breaker failure protection — and thus the circuit breaker that is monitored by it —
is normally assigned to a measuring location or to a side (see above, under margin
heading „Further 3-Phase Protection Functions“). You can therefore set addresses
831 to 835 SwitchgCBaux S1 to SwitchgCBaux S5 if a side is concerned, or ad-
dresses 836 to 840 SwitchgCBaux M1 to SwitchgCBaux M5 if a measuring loca-
tion is concerned.
You can, alternatively, monitor any desired circuit breaker, exclusively by means of the
CB position indication, i.e. without consideration of current flow. In this case you must
have selected 470 under address BREAKER FAIL.AT Ext. switchg. 1. You have
then to select the corresponding breaker feedback information under address 841
SwitchgCBaux E1 (switching device auxiliary contact of external breaker).
Select the address which corresponds to the assignment of the circuit breaker failure
protection. There, you choose from the following options:
1. If during the configuration of the binary inputs you have defined the circuit breaker
as a control object, and allocated the appropriate feedback indications, you
choose these feedback indications to determine the circuit breaker position, e.g.
„Q0“. The breaker position is then automatically derived from the circuit breaker
Q0.
2. If during the configuration of the binary inputs you have generated a single-point
indication which is controlled by the NC or NO auxiliary contacts of the circuit
breaker, you select this indication.
3. If during the configuration of the binary inputs you have generated a double indi-
cation which is controlled by the NC or NO auxiliary contact of the circuit breaker
(feedback from the protected object), you select this indication.
4. If you have generated appropriate indications using CFC, you can select these in-
dications.
In any case, you must make sure that the selected option indicates also the position
of the monitored circuit breaker. If you have not yet generated an indication for control
and feedback of the breaker to be monitored you should do so now. Detailed informa-
tion is given in the SIPROTEC 4 System Description.
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