Vanguard EZCT-S2A - Manual (Page 96)

EZCT S2A USER’S MANUAL REV 1
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A common practice for verifying the CT turns-ratio in the field is to apply an AC voltage to the
CT secondary full winding (X1-X5). A volt meter can be used to verify the voltage drop across
the CT terminals.
For example, if a 120Vac voltage is applied to the X1-X5 of this CT, the voltage reading across
X2-X5 shall be expected as follows:
Voltage (X2-X5) = 120 V x ( ) = 100 V
Figure 23
This method also eliminates the effect of the (reactor) winding on the H1 – H2 terminals.