Section 3: Putting Into Service - Siemens 7SR18 Solkor Manual

7SR18 Commissioning & Maintenance Guide
If load levels are very low set both relays to the minimum P/F Differential of 0.1 x In. As indicated above the
minimum levels are 13 mA for 1 A and 60 mA for 5 A terminals. If 5 A CT's are used and the secondary current is
below 60 mA, the check for an increase in differential current may be carried out by temporarily connecting the 5
A CT wiring to the 1 A relay input terminals.
Test Waveform Records
The Reydisp Evolution software program can be employed to trigger waveform storage to provide a record of
these tests. A snapshot of the load current can be taken for both of the above tests and in the case of Test No 1
the trip record can also be taken.
Waveform storage can be triggered either by the trip initiation (i.e. Test No 1) or by energising a status input
which has been programmed to trigger a waveform record (i.e. Test No 2). These records can be used as part of
the protection commissioning report for the relay under test.

Section 3: Putting Into Service

After tests have been performed satisfactorily the relay should be put back into service as follows:
Remove all test connections.
Where possible, the relay settings should be down-loaded to a computer and a printout of the settings produced.
This should then be compared against the required settings. The Reydisp Evolution Software can compare
settings files automatically. To do this open the two settings files for comparison and select [Relay] [Compare
Settings]. Select one file to compare to the other and select [Compare]. Differences are highlighted in colour.
It is important that the correct settings group is active if more than one group has been programmed.
Replace all fuses and links.
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