Siemens SIPROTEC 7SD610 Manual page 45

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 following each recognition of line
energization, SI Time Man.Cl (address 1150) is the time following manual closure during which special in-
fluence of the protection functions is activated (e.g. the switch-on pickup threshold for the differential protec-
tion). This parameter can only be altered in DIGSI at 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) are relevant for the circuit breaker test and for the automatic reclosure 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. 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 con-
nected 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 2.16.1, 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.
Under address 1151 SYN.MAN.CL it can be determined whether a manual closure of the circuit breaker is to
be performed via binary input. If manual closing is to be performed without synchronism check, set
SYN.MAN.CL = w/o Sync-check. To not use the MANUAL CLOSE function of the device, set SYN.MAN.CL
to NO. This may be reasonable if the close command is output to the circuit breaker without involving the
7SD610, and the relay itself is not desired to issue a close command.
Note
If you set the parameter 1151 SYN.MAN.CL to w/o Sync-check, it is recommendable to set the software
filter time under DIGSI 4 for the binary input 356 „>Manual Close" to 50 ms.
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
Functions
2.1 General
45