General Notes - Siemens Reyrolle 7SR5 Manual

Functional Tests

9.1 General Notes

9.1 General Notes
Various tests have to be performed for commissioning to warrant the correct function of the device. The
commissioning and maintenance of this equipment should only be carried out by skilled personnel trained in
protective relay maintenance and capable of observing all the safety precautions and regulations appropriate
to this type of equipment, the test equipment and also the associated primary equipment.
Inspection
Check that the device is not physically damaged.
The equipment ratings, operating instructions, and installing structions shall be checked before comissioning
or maintenance actions.
The integrity of any protective earth conductor connection shall be checked before carrying out any other
actions.
Ensure that all connections are tight and correct to the relay wiring diagram and the scheme diagram. Check
that the relay is the correct model and version and is correctly configured. Check that it is fully inserted into
the case.
Settings and Configuration
Select the required relay configuration and settings for the application. If more than 1 settings group is to be
used for the application, it may be necessary to test both groups and also to test operation of the change
mechanism. When using settings groups it is important to remember that the relay need not necessarily be
operating according to the settings that are currently being displayed on the device screen. There is an Active
Settings Group on which the relay operates and an Edit/View Settings Group which is visible on the display
and which can be changed from the fascia keys. This allows the settings in 1 group to be altered from the
relay fascia while the protection continues to operate on a different unaffected group. The Active Settings
Group and the Edit Settings Group are selected in the Configuration Device menu. The currently Active
Group and the group currently Viewed are shown at the top of the display in the Settings display screen. If
the View Group is not shown at the top of the display, this indicates that the setting is common to all groups.
CT/VT ratio, I/O mapping and other settings which are directly related to hardware are common to all groups. If
the relay is allowed to trip during testing then the instruments display will be interrupted and replaced by the
Trip Alert screen which displays fault data information. If this normal operation interferes with testing then
this function can be temporarily disabled for the duration of testing by use of the Trip Alert enabled/disabled
setting in the Configuration Device menu.
Hardware Tests
Operation of all inputs and outputs is tested in the factory. Tests can be repeated to check the device opera-
tion in its intended application or by simple direct operation tests as described below.
AC measuring accuracy is calibrated and tested in the factory but can be easily tested by checking values
displayed by the relay instruments during secondary injection as described below.
Secondary Injection Tests
Secondary tests can never replace primary tests because they cannot include connection faults. They provide a
theoretical check of the setting values only.
For tests using secondary test equipment, make sure that all necessary input signals are simulated and output
circuits are interrupted, particularly trip and close commands to the circuit‑breakers and other plant unless
that functionality is included in the test.
Isolate the auxiliary DC supplies for alarm and tripping from the relay and remove the trip and intertrip links.
Ensure that any essential services that share supplies are not interrupted.
Disconnect communications ports or configure control systems to prepare for the tests.
Carry out injection tests for each relay function as required as described in this document.
404 Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019