CT Analyzer User Manual
30
Figure 2-7 Excitation curve measurement using one "auxiliary winding"
cable
Figure 2-8 Excitation curve measurement using several cascaded
"auxiliary winding" cables
2.5.3 Measurement on a GIS (SF6) Switch Gear
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.
Iron core without winding
23 turns auxiliary
winding
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