2.2 Functional Scope
31
7UM61 Manual
C53000-G1176-C127-3
2.2
Functional Scope
The 7UM61 device has numerous protection and supplementary functions. The hard-
ware and firmware provided is designed for this scope of functions. Nevertheless a
few restrictions apply to the use of the earth fault current and earth fault voltage inputs
UE and IEE respectively. The same input can not be simultaneously fed with different
measured values, e.g. for rotor earth fault protection and stator earth fault protection.
In addition the command functions can be matched to the system conditions. Also in-
dividual functions can be enabled or disabled during configuration. Functions not
needed can be thus be deactivated.
The available protection and supplementary functions can be configured as
Enabled
or
Disabled
. For some functions a choice between several alternatives is possible, as
described below.
Functions configured as disabled are not processed by the 7UM61. There are no in-
dications, and corresponding settings (functions, limit values) are not displayed during
setting.
2.2.1
Functional Description
Configuration of the Functional Scope
Configuration settings can be entered using a PC and the software program DIGSI
®
and transferred via the front serial port or the rear service interface. Operation is de-
scribed in the SIPROTEC
®
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 transferred to the device.
Functional scope and as the case may be possible alternatives are adapted to the
power system conditions in the Function Scope dialog box.
Note
Available functions and default settings depend on the ordered device variant (see Ap-
pendix for details). Also, not all combinations of protective functions are possible
because of certain restrictions imposed by the hardware (see Section 2.2.2).
2.2.2
Setting Notes
Special Cases
Most settings are self-explanatory. The special cases are described below.
If use of the setting group change function is desired, address
103
Grp Chge
OPTION
should be set to
Enabled
. In this case, it is possible to apply two groups of
settings for function parameters (refer also to Section 2.4) allowing convenient and
fast switch-over between these setting groups. Only one function parameter group
may be selected and used if the setting is
Disabled
.
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