Putting Into Service; Site Test Sheet - Siemens 7SG14 Duobias-M-200 Technical Manual

Next unbalance the differential protection by 180° reversing a vector group compensation setting. e.g.
Yd1 would become yD7
Yy0 would become Yy6
Repeat the tests and record the currents inTable 15.
The operate currents "OPERATE A, B, C" should now be comparatively large.
Reset the vector group compensation setting back to the correct setting, re-check that the "OPERATE A, B, C"
currents are negligible.
12

Putting into service

Ensure that: The trip supply is connected.
Press the CANCEL button several times on the front of the relay to move back to the top of the menu structure
Press the TEST/RESET pushbutton
None of the RED LEDs should be illuminated.
Check the Protection Healthy GREEN LED has continuous illumination.
Ensure that all earth links, trip links and inter-trip links are in their normal operational positions.
Operate the Cancel PUSH BUTTON
Replace the cover.
13

Site test sheet

See following pages
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©2010 Siemens Protection Devices Limited
7SG14 Duobias-M-200 Commissioning
Chapter 7 Page 13 of 20