Test Equipment; Precautions; Applying Settings - Siemens 7SR224 Manual

1.2.3

Test Equipment

Required test equipment is:
1. Secondary injection equipment with integral time interval meter The secondary injection equipment
should be appropriate to the protection functions to be tested
2. Primary injection equipment
3. A d.c. supply with nominal voltage within the working range of the relay's d.c. auxiliary supply rating
4. A d.c. supply with nominal voltage within the working range of the relay's d.c. binary input rating
5. Other equipment as appropriate to the protection being commissioned – this will be specified in the
product specific documentation.
. Additional equipment for general tests and for testing the communications channel is:
6. Portable PC with appropriate interface equipment.
7. Printer to operate from the above PC (Optional).
U PC
SE OF TO FACILITATE TESTING
The functions of Reydisp Evolution (see Section 2: Settings and Instruments) can be used during the
commissioning tests to assist with test procedures or to provide documentation recording the test and test
parameters. One method is to clear both the waveform and event records before each test is started, then, after
the test upload from the relay the settings, events and waveform files generated as a result of application of the
test. These can then be saved off to retain a comprehensive record of that test.
Relay settings files can be prepared on the PC (offline) or on the relay before testing commences. These settings
should be saved for reference and compared with the settings at the end of testing to check that errors have not
been introduced during testing and that any temporary changes to settings to suit the test process are returned to
the required service state.
A copy of the Relay Settings as a Rich Text Format (.rtf) file suitable for printing or for record purposes can be
produced from Reydisp as follows. From the File menu select Save As, change the file type to Export
Default/Actual Setting (.RTF) and input a suitable filename.
When testing is completed the event and waveform records should be cleared and the settings file checked to
ensure that the required in-service settings are being applied.
1.2.4

Precautions

Before electrical testing commences the equipment should be isolated from the current and voltage transformers.
The current transformers should be short-circuited in line with the local site procedure. The tripping and alarm
circuits should also be isolated where practical. The provision and use of secondary injection test sockets on the
panel simplifies the isolation and test procedure.
Ensure that the correct auxiliary supply voltage and polarity is applied. See the relevant scheme diagrams for the
relay connections.
Check that the nominal secondary current rating of the current and voltage transformers has been correctly set in
the System Config. menu of the relay.
1.2.5

Applying Settings

The relay settings for the particular application should be applied before any secondary testing occurs. If they are
not available then the relay has default settings that can be used for pre-commissioning tests. See the Relay
Settings section of this manual for the default settings.
Note that the tripping and alarm contacts for any function must be programmed correctly before any scheme tests
are carried out.
Relays feature multiple settings groups, only one of which is active at a time. In applications where more than one
settings group is to be used it may be necessary to test the relay in more than one configuration.
Note. One group may be used as a 'Test' group to hold test-only settings that can be used for regular
maintenance testing, eliminating the need for the Test Engineer to interfere with the actual in-service settings in
the normally active group. This Test group may also be used for functional testing where it is necessary to disable
or change settings to facilitate testing.
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. 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 altered. This allows the
©2010 Siemens Protection Devices Limited
7SR224 Argus Commissioning & Maintenance Guide
Chapter 6 Page 6 of 73