2 Functions
38
7SD5 Manual
C53000-G1176-C169-1
The available protection and supplementary functions can be configured as Enabled
or Disabled. For some functions, a choice may be presented between several
options which are explained below.
Functions configured as Disabled are not processed by the 7SD5. There are no in-
dications, and corresponding settings (functions, limit values) are not displayed during
setting.
Note
The functions and default settings available depend on the order variant of the device.
2.1.1.2 Control of the Main Protection Functions
Differential and Dis-
tance Protection
If the order option specifies that the 7SD5 universal line protection includes the dis-
tance 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 protection 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 distance protection operates as the main pro-
tection function (if it is activated).
2.1.1.3 Setting Notes
Configuration of
Function Scope
Configuration settings can be entered using a PC and the operating software DIGSI
®
and transferred via the operator interface on the front panel of the device or via the
service interface. For more information on working with DIGSI
®
, please refer to the
SIPROTEC
®
4 System Description /1/.
For changing configuration parameters in the device, password no. 7 is required (for
parameter set). Without the password, the settings may be read, but may not be mod-
ified and transmitted to the device.
The scope of functions with the available options is set in the Functional Scope dialog
box to match plant requirements.
Most settings are self-explaining. The special cases
are described below.
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