Loud CTs 3

Palletjack · Apr 29, 2021

Just how loud should 75kV CTs be when they are shunted?
I have some that are humming pretty good when shunted, then quiet down to nothing when they are unshunted and are attached to the 751A.[pre][/pre]

waross · Apr 29, 2021

Strange. there should be the same current whether shunted or connected to an instrument.
Is it possible that you may have bad connections on the shunts?

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

RRaghunath · Apr 30, 2021

Agree with Bill.
You better do proper shunting, seems some loose connection (while shunting).

scottf · Apr 30, 2021

Agree on the above.

Assuming by shunting you mean shorting the secondary windings.

If the CT is making noise when the secondary is shorted and does not make noise when connected to a burden, then there is likely something wrong with your shorting and you may have actually placed in open circuit or very high burden on the secondary. Depending on how long this condition lasted, you could have damaged the CT.

The noise likely comes from the core being saturated, which can create a lot of heat and ultimately damage the secondary and/or primary insulation.

Mbrooke · Apr 30, 2021

@Scottf- star given- great explanation

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Loud CTs 3

Palletjack

Electrical

waross

Electrical

RRaghunath

Electrical

scottf

Electrical

Mbrooke

Electrical

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