Functions
2.1 General
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
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2.1
General
A few seconds after the device is switched on, the default display appears on the LCD. Depending on the
device version either measured values (four-line display) or a single-phase switching diagram of the feeder
status (graphic display) is displayed in the 7SD5.
Configuration settings can be entered by using a PC and the DIGSI operating software and transferred via the
operator interface on the front panel of the device or via the service interface. 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 may not be modified and transmit-
ted to the device.
The function parameters, i.e. function options, threshold values, etc., can be changed via the front panel of the
device, or via the operator or service interface from a personal computer using DIGSI. The level 5 password
(individual parameters) is required.
This general section describes which device settings reflect the interaction between your substation, its mea-
suring points (current and voltage transformers), the analog device connections and the various protection
functions of the device.
First (Subsection 2.1.1) you have to specify which protection functions you want to use since not all functions
integrated in the device are necessary, useful or even possible for your relevant 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, po-
larity 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 functions (e.g. backup distance protection) you select what
measured values will be processed 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 protection and additional functions. The hardware and firmware is de-
signed for this scope of functions. Additionally, the command functions can be matched to the system condi-
tions. Furthermore, 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 over-
head lines only. In the devices for the transformer feeders this function is therefore set to „Disabled“.
The available protection functions and additional functions can be configured as
Enabled
or
Disabled
. For
some functions, a choice between several options is possible which are described below.
Functions configured as
Disabled
are not processed by the 7SD5. There are no indications, and correspond-
ing settings (functions, limit values) are not displayed during setting.
