Siemens SIPROTEC 5 Manual page 226

Commissioning
9.4 Secondary Tests
Testing of Protection Functions
•
Before checking, familiarize yourself first with the measuring principle of the protection function in the
Device manual and consider the test recommendations given in the Device manual.
•
Perform the tests using multi-phase test equipment since numerous protection functions require a 3-
phase system.
•
You can test most protection functions using stationary signals. Some protection functions require tran-
sient signals. Typical examples are the testing of protection reaction on power swings (power-swing
blocking in distance protection and out-of-step protection) and the transient effect on transformers. They
generate transient test files with a dynamic network calculation program or these test files are provided
by special test programs.
•
If setting values are offered only in percent or per unit, remember that the setting values refer only to
rated quantities of the protected object. Secondary test quantities must be converted using the trans-
former ratio.
•
Perform the tests successively. Activate only the function that you wish to test. Make use of DIGSI 5
support (see chapter
•
Since protection functions can be assigned to different protection function groups, check the interaction
between function groups as well. If you have created your own application template or modified the
delivered template, Siemens recommends that you check the interaction. The application templates
provided with the device have been tested.
•
Check the reaction of the protection functions via the indications in the corresponding logs. The indica-
tions in the spontaneous indication log (available in online mode), which are shown at the moment of
occurrence, are a good tool. Testing using the fault record (binary signal traces in relation to the input
variables) is also advisable for transient processes.
•
Check the correct routing of signals of the protection function.
•
Check individual protection functions in the test editor using signals from test equipment or the internal
signal generator (sequences). Examine the test sequence in the characteristic curve of the protection
function and its spontaneous indications.
Checking Function Charts (CFC)
•
Created logics (function charts) must be tested. A working relationship with the engineering department
is necessary for this purpose. Familiarize yourself first with the objective of the function chart. DIGSI 5
offers you a tracing function during offline operation. This allows you to verify the correct logical
sequence by loading the function chart with test sequences and following the reaction in the function
chart. Switchgear interlockings and other logic can be tested easily with it.
•
If the logic reacts to transient changes, you must perform dynamic tests. To do this, generate the neces-
sary test sequences and load them into the device. You can then provide inputs or outputs for tracing in
the function chart. The exact temporal sequence of signals is then logged in a fault record during the
progress of the test sequence. This can be analyzed, for example, using SIGRA and the runtimes and time
differences analyzed. This is a very good way of checking and simultaneously documenting behavior over
time (file export in PDF format).
Checking Control Functions
•
Switching of switching devices requires that the switchgear interlockings are properly executed and that
the correct signals are fed to the logic. Perform the corresponding tests. Check the switchgear inter-
locking by simulating the corresponding input variables and checking the reaction on the output.
•
If you perform on-site control with the device, check the on-site control diagram in devices with large
display. Select the respective switching device and check the different switching operations. Check the
reaction on the outputs.
•
In devices with small display, select the switching device (selection via text) and execute the switching
operation as well.
226
9.2.3 Testing Protection Functions).
SIPROTEC 5, Operation, Manual
C53000-G5040-C003-C, Edition 08.2020