Siemens SIPROTEC Manual page 65

Address 1134 Line Closure specifies the criteria used by the integrated circuit breaker switching detection.
Only with ManCl means that only the manual close signal via binary input or the integrated control is eval-
uated as closure. I OR U or ManCl means that additionally the measured currents or voltages are used to
determine closure of the circuit breaker, whereas CB OR I or M/C implies that either the currents or the states
of the circuit breaker auxiliary contacts are used to determine closure of the circuit breaker. If the voltage trans-
formers are not arranged on the line side, the setting CB OR I or M/C must be used. In the case of I or
Man.Close only the currents or the manual close signals are used to recognise closing of the circuit breaker.
Before each line energization detection, the breaker must be recognized as open for the settable time1133 T
DELAY SOTF.
Address 1135 Reset Trip CMD determines under which conditions a trip command is reset. If
CurrentOpenPole is set, the trip command is reset as soon as the current disappears. It is important that the
value set in address 1130 PoleOpenCurrent (see above) is undershot. If Current AND CB is set, the circuit
breaker auxiliary contact must send a message that the circuit breaker is open. It is a prerequisite for this setting
that the position of the auxiliary contacts is allocated via a binary input.
For special applications, in which the device trip command does not always lead to a complete cutoff of the
current, the setting Pickup Reset can be chosen. In this case, the trip command is reset as soon as the
pickup of the tripping protection function drops off and - just as with the other setting options- the minimum trip
command duration (address 240) has elapsed. The setting Pickup Reset makes sense, for instance, during
the test of the protection equipment, when the system-side load current cannot be cut off and the test current
is injected in parallel to the load current.
While the time SI Time all Cl. (address 1132, see above) is activated with each line energisation, SI
Time Man.Cl (address 1150) is the time following manual closure during which a possible influence on the
protection functions becomes effective (e.g. the switch-on pickup threshold for the differential protection or the
increased reach for the distance protection). This setting can only be made in DIGSI under Display Additional
Settings.
Note
For CB Test and automatic reclosure the CB auxiliary contact status derived with the binary inputs >CB1 ... (No.
366 to 371, 410 and 411) is relevant to indicate the CB switching status. The other binary inputs >CB ... (No.
351 to 353, 379 and 380) are used for detecting the status of the line (address 1134) and for reset of the trip
command (address 1135). Address 1135 is also used by other protection functions, e.g. by the echo function,
energization in case of overcurrent etc. For use with one circuit breaker only, both binary input functions, e.g.
366 and 351, can be allocated to the same physical input. For applications with 2 circuit breakers per feeder
(1.5 circuit breaker systems or ring bus), the binary inputs >CB1... must be connected to the correct circuit
breaker. The binary inputs >CB... then need the correct signals for detecting the line status. In certain cases,
an additional CFC logic may be necessary.
Address 1136 OpenPoleDetect. defines the criteria for operating the internal open-pole detector (see also
Section 2.25.1, Subsection Open-Pole Detector). When using the default setting w/ measurement, all avail-
able data are evaluated that indicate single-pole dead time. The internal trip command and pickup indications,
the current and voltage measured values and the CB auxiliary contacts are used. To evaluate only the auxiliary
contacts including the phase currents, set the address 1136 to Current AND CB. If you do not wish to detect
single-pole dead time, set OpenPoleDetect. to OFF.
For manual closure of the circuit breaker via binary inputs, it can be specified in address 1151 SYN.MAN.CL
whether the integrated manual CLOSE detection checks the synchronism between the busbar voltage and the
voltage of the switched feeder. This setting does not apply for a close command via the integrated control func-
tions. If the synchronism check is desired, the device must either feature the integrated synchronism check
function or an external device for synchronism check must be connected.
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Functions
2.1 General
65