Functions
2.1 General
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
38
Note
The functions and default settings available depend on the device version ordered.
2.1.1.2 Control of the Main Protection Functions
Differential and Distance Protection
If the order option specifies that the 7SD5 universal line protection includes the distance protection, the device
can be operated in three modes:
1. Differential protection with distance protection
2. Differential protection only
3. Distance protection only
In mode 1, the distance protection operates in parallel with the differential protection. In this mode, both protec-
tion functions are configured (address 112 DIFF.PROTECTION; address 115 Phase Distance, address
116 Earth Distance and address 117 Dis. PICKUP), and can be switched ON or OFF with the addresses
1201 STATE OF DIFF. and 1501 FCT Distance. When the differential protection is switched off or blocked,
the distance protection continues to operate without restrictions.
You can also operate the differential protection without distance protection (mode 2, addresses 115, 116 and
117 = Disabled). The device behaves in this case like a normal line differential protection relay.
In mode 3 the differential protection is not configured (address 112 DIFF.PROTECTION = Disabled), the dis-
tance protection operates as main protection (provided that it is activated).
2.1.1.3 Setting Notes
Configuring the functional scope
The scope of functions with the available options is set in the Functional Scope dialog box to match plant re-
quirements.
Most settings are self-explanatory. The special cases
are described below:
Special features
If use of the setting group changeover function is desired, address 103 Grp Chge OPTION should be set to
Enabled. In this case, up to four different groups of settings may be changed quickly and easily during device
operation (see also Section 2.1.3). With the setting Disabled only one parameter group is available.
Address 110 Trip mode is only valid for devices that can trip single-pole or three-pole. Set 1-/3pole to
enable also single-pole tripping, i.e. if you want to utilise single-pole or single-pole/three-pole automatic reclo-
sure. This requires that an internal automatic reclosure function exists or that an external reclosing device is
used. Furthermore, the circuit breaker must be capable of single-pole tripping.
Note
If you have changed address 110, save your changes first via OK and reopen the dialog box since the other
setting options depend on the selection in address 110.
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