Doble TDR900 User Guide
72A-2612-01 Rev. A 09/06
22
Connect the Common (black color-coded) lead to the bushings which have been
grounded; connect the three-phase leads (color-coded red, yellow and blue) to the three
ungrounded breaker bushings (one to each).
Figure 12. Contact Monitor Cable for Overall Test
5.5.2 Sectional Test (live Tank or EHV test)
One cable is required for each pair of contacts for the sectional test on each phase. The
common lead should attach to the center of the breaker section, with the contacts attached
to the bushing terminals, as shown in Figure 13. Two further cables will be needed for the
other two phases.
TDR900 & PC
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