CT Saturation Test: : Should H1 and H2 be open?
CT Saturation Test: : Should H1 and H2 be open?
(OP)
Would like to be sure about doing a CT Saturation Test. I am a ware that the best would be to apply a variable voltage at the secondary X1 and X2. But tel me, must H1 and H2 be left open or must shorted (this looks unlikely for testing large CTs inserted in transformer bushings or swtchgear, though).






RE: CT Saturation Test: : Should H1 and H2 be open?
Example: 1200:5 C200 ANSI CT. With 120 V across X1-X2, 0.5 volts will appear on H1-H2.
RE: CT Saturation Test: : Should H1 and H2 be open?
Keep in mind on bushing CTs, you're likely not testing them while the device (transformers, breaker, etc...is energized. As long as there is an isolation switch open on the high side, then that is an open-circuited primary.
RE: CT Saturation Test: : Should H1 and H2 be open?
In short:
Like the others said yes, they will be open.