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Functions
2.1 General
If the internal synchronism check is to be used, the synchronism check function must be enabled; an additional
voltage U
for synchronism check has to be connected to the device and this must be correctly parameterised
sy2
in the Power System Data (Section 2.1.2.1, address 210 U4 transformer = Usy2 transf. and the asso-
ciated factors).
If no synchronism check is to be performed with manual closing, set SYN.MAN.CL = w/o Sync-check. If a
check is desired, set with 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 in-
volving the 7SD5, and the relay itself is not desired to issue a close command.
Note
If you set the parameter 1151 SYN.MAN.CL to with Sync-check or 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.
For commands via the integrated control (on site, DIGSI, serial interface) address 1152 Man.Clos. Imp.
determines whether a close command via the integrated control regarding the MANUAL CLOSE handling for
the protection functions (like instantaneous re-opening when switching onto a fault) is to act like a MANUAL
CLOSE command via binary input. This address also informs the device to which switchgear this applies. You
can select from the switching devices which are available to the integrated control. Select the circuit breaker
which operates for manual closure and, if required, for automatic reclosure (usually Q0). If none is set here, a
CLOSE command via the control will not generate a MANUAL CLOSE impulse for the protection function.
Three-pole coupling
Three-pole coupling is only relevant if single-pole auto-reclosures are carried out. If not, tripping is always
three-pole. The remainder of this margin heading is then irrelevant.
Address 1155 3pole coupling determines whether each tripping command resulting from pickup in more
than phase is 3-pole or whether only each multi-pole tripping command results in a three-pole trip. This setting
is only relevant for versions with single-pole and three-pole tripping and is only available there. It does not have
an impact on the differential protection itself since pickup and tripping are equivalent. The time overcurrent pro-
tection function, however, can also pick up in the event of a fault occurred outside the protected object, without
tripping.
More information on the function is also given in Section 2.25.1 Pickup Logic for the Entire Device.
With the setting with with PICKUP every pickup in more than one phase leads to three-pole tripping, even if
only a single-phase earth fault is situated within the protection zone, and further faults (e.g. caused by overcur-
rent), only affect the higher zones, or are located in the reverse direction (distance protection). Even if a single-
pole trip command has already been issued, each further pickup will lead to three-pole coupling of the trip out-
puts.
If, on the other hand, this address is set to with TRIP (default setting for differential protection), three-pole
coupling of the trip output (three-pole tripping) only occurs when more than one pole is tripped. Therefore, if a
single-phase fault occurs within the protected zone and a further fault outside of it, single-pole tripping is pos-
sible. A further fault during the single-pole tripping will only lead to a three-pole coupling, if it occurs within the
protected zone.
This parameter is valid for all protection functions of 7SD5 which are capable of single-pole tripping. The default
setting is with TRIP.
The difference made by this parameter becomes apparent when multiple faults are cleared, i.e. faults occurring
almost simultaneously at different locations in the network.
66
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
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