Technical Guide
Testing self-powered relays with SVERKER 900
Page 17(33)
Figure 17. First operate time
measurement for 0,8 A.
Select the quantity that you want to change (I1 in this case), rotate the knob to change its value and press the
knob to inject that current level after the pre-fault (Figure 18):
Figure 18. Select the quantity you want
to change by tapping on it, change it
with the knob. Press the knob to inject
it.
To stop the sequence of tests, tap
(Figure 19); the list of the tests will be shown.
Notice the test values below 4A (threshold for I>>) for testing the non-trip of the I>> threshold (par. 4.1.3).
In this case, tests slightly above 4A have been done, but the test results were well in line with the expected
values, so there was no need to run tests with currents above 1,3 x 4 A = 5,2 A. Also it can be noticed that the
I>> threshold was measured at roughly 3,9 A of injection. This represents a 10% error on current measurement
and is reasonable (see par. 5.2.5) considering the analog circuitry between the SVERKER 900 and the analog
inputs of the protection relay (S1-S2 terminals). See details in par. 5.2.5.
Figure 19. The sequence of tests is
finished and the list of the tests is
shown by SVERKER 900
To graphically view the test results, tap on
