2.1 General
37
7SD5 Manual
C53000-G1176-C169-1
2.1
General
A few seconds after the device is switched on, the initial display appears in the LCD.
In the 7SD5 the measured values are displayed.
Configuration of the device functions is made via the DIGSI
®
software from your PC.
The procedure is described in detail in the SIPROTEC
®
4 System Description. Entry
of password no. 7 (parameter set) is required to modify configuration settings. Without
the password, the settings may be read, but cannot be modified and transmitted to the
device.
The function parameters, i.e. settings of function options, threshold values, etc., can
be entered via the front panel of the device, or by means of a personal computer con-
nected to the operator or service interface of the device utilizing the DIGSI
®
software
package. Password no. 5 (individual parameters) is required.
This general section describes which device settings reflect the interaction between
your substation, its measuring locations (current and voltage transformers), the analog
device connections and the various protection functions of the device.
In a first step (Section 2.1.1), you have to specify which protection functions you want
to use, because not all of the functions integrated in the device are necessary, useful
or even possible for your relevant case of application.
After entering some System Data (frequency), you inform the device (Section 2.1.2) of
the properties of the main protected object. This comprises e.g. nominal system data,
nominal data of instrument transformers, polarity and connection type of measured
values
The above information is sufficient to describe the protected object to the device's
main protection function, i.e. the differential protection. For the other protection func-
tions (e.g. backup distance protection) you select what measured values will be pro-
cessed and in which way.
You will be informed how to set the circuit breaker data, and find out about setting
groups and how to use them.
Last but not least, you can set general data which are not dependent on any protection
functions.
2.1.1
Functional Scope
2.1.1.1
Configuration of the Scope of Functions
The 7SD5 device contains a series of protective and additional functions. The hard-
ware and firmware provided is designed for this scope of functions. In addition, the
command functions can be matched to the system conditions. In addition, individual
functions may be enabled or disabled during configuration, or interaction between
functions may be adjusted.
Example for the configuration of scope of functions:
A substation has feeders with overhead lines and transformers. Fault location is to be
performed on the overhead lines only. In the devices for the transformer feeders this
function is therefore „Disabled“.
www
. ElectricalPartManuals
. com
