Vanguard EZCT-S2A - Manual (Page 95)

REV 1 EZCT S2A USER’S MANUAL
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Figure 22 show a CT with 5 taps. The turns-ratio of the CT can be measured by treating the CT
secondary winding as an auto-transformer. When using this method, the effect of the shunt
reactor winding is totally eliminated.
The turns-ratio measured by the EZCT or any electronic TTR is calculated as follows:
Ratio =
Figure 22
From the name plate of the CT show in table below, the turns-ration can be calculated as
follows:
Ratio Terminal
1200-5A X1-X5
1000-5A X2-X5
Calculated Ratio =
( )
(
= = 1.20