Tests For Breaker Failure Protection - Siemens SIPROTEC 4 Manual

Mounting and Commissioning
3.3 Commissioning
Test of the Binary Inputs
To test the wiring between the plant and the binary inputs of the 7SJ80 the condition in the plant which
initiates the binary input must be generated and the response of the device checked.
To do so, the dialog box Hardware Test must be opened again to view the physical state of the binary inputs.
The password is not yet required.
Proceed as follows in order to check the binary inputs:
•
Activate each of function in the system which causes a binary input to pick up.
•
Check the reaction in the Status column of the dialog box. To do so, the dialog box must be updated. The
options may be found below under the margin heading "Updating the Display".
•
Finish the testing (see margin heading below "Exiting the Test Mode").
If ,however, the effect of a binary input must be checked without carrying out any switching in the plant, it is
possible to trigger individual binary inputs with the hardware test function. As soon as the first state change of
any binary input is triggered and the password No. 6 has been entered, all binary inputs are separated from
the plant and can only be activated via the hardware test function.
Test of the LEDs
The LEDs may be tested in a similar manner to the other input/output components. As soon as the first state
change of any LED has been triggered, all LEDs are separated from the internal device functionality and can
only be controlled via the hardware test function. This means e.g. that no LED is illuminated anymore by a
protection function or by pressing the LED reset button.
Updating the Display
As the Hardware Test dialog opens, the operating states of the hardware components which are current at
this time are read in and displayed.
An update is made:
•
for each hardware component, if a command to change the condition is successfully performed,
•
for all hardware components if the Update button is clicked,
•
for all hardware components with cyclical updating (cycle time is 20 seconds) if the Automatic Update
(20sec) field is marked.
Exiting the Test Mode
To end the hardware test, click on Close. The dialog box is closed. The device becomes unavailable for a brief
start-up period immediately after this. Then all hardware components are returned to the operating conditions
determined by the plant settings.

Tests for Breaker Failure Protection

3.3.5
General
If the device provides a breaker failure protection and if this is used, the integration of this protection function
in the system must be tested under practical conditions.
Due to the variety of application options and the available system configurations, it is not possible to make a
detailed description of the necessary tests. It is important to observe local conditions and protection and
system drawings.
Before starting the circuit breaker tests it is recommended to isolate the circuit breaker of the tested feeder at
both ends, i.e. line isolators and busbar isolators should be open so that the breaker can be operated without
risk.
340 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017