Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
410
Figure 3-22 Test fault recording
After this the fault resistors for the warning and the trip stage are installed, and the operational measured value
R
earth
is read out. The two measured values are the basis for the setting values of the warning stage (address
6102 RE< WARN) and the trip stage (address 6103 RE<< TRIP).
Finally, the warning and the trip stage are checked. The test resistance for this is approx. 90 % of the set value.
On machines with slipring excitation, the test is performed for both sliprings.
Remove the earth fault resistor and lift the measuring brushes or interrupt the measuring circuit. After a delay
of approx. 10 s, the indication „REF 1-3Hz open“ is issued (not allocated on delivery). Reclose the measur-
ing circuit.
If you want to perform an automatic test by means of a test resistor, this mechanism needs to be tested as well.
For this purpose, connect the test resistor at the slipring to the earth, and activate the test via binary input
(„>Test REF 1-3Hz“).
Next check the indications for the four test steps to be performed.
1. Measurement circuit has been closed, Indications „Test REF PASSED“
2. Open connection at 1st coupling resistor Indication „1 Cir. open“
3. Open connection at 2nd coupling resistor Indication „2 Cir. open“
4. Reestablish connections Indication „Test REF PASSED“
Stop the automatic test and check again the operational measured value R
earth
. It must display 999.9 kΩ.
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