Measurement On A Gis (Sf6) Switch Gear - Omicron Lab CT Analyzer User Manual

CT Analyzer User Manual
2.5.3

Measurement on a GIS (SF6) Switch Gear

30
Figure 2-7 Excitation curve measurement using one "auxiliary winding"
cable
Figure 2-8 Excitation curve measurement using several cascaded
"auxiliary winding" cables
Proceed as follows to perform measurements on a GIS (SF6) switch gear (refer
to Figure 2-9). Observe the general safety rules in section 2.1 on page 21.
1. Disconnect all utility lines.
2. Open all circuit breakers to the bus bars.
3. Close the earthing switch.
4. Connect one secondary side terminal of the CT to protective earth.
23 turns auxiliary
winding
Iron core without winding