CT saturation voltage 2

[electrolitic]

If a CT originally designed to be applied at 50 Hz circuit is installed at 60Hz which would be the influence over the secondary saturation voltage?
Thanks

 

[Skogsgurra]

The saturation voltage increases 20%

The reason is that the sine's half-period is only 8.33 ms at 60 Hz, while it is 10 ms at 50 Hz and that saturation is dependent on volt-seconds absorbed. With narrower sine, you can have more volts.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[electrolitic]

Thanks Skogsgurra
I had thought the same but I was concerned with the "B" ( the magnetic flux density in Tesla) that also depends of frequency (number of turns/core cross section of course are the same). Why my concern doesn't make sense? Thank you again.

 

[electricpete]

Gunnar was certainly right.

To say it another way: Let’s say you are doing a simple secondary excitation test. You are applying voltage to an iron-core inductor. Now decrease the frequency of the test voltage (without the voltage magnitude) . What happens?

f = Frequency decreases
The impedance of inductor X = j*2*pi*f*L decreases.
The excitation current I = V / X increases.
The flux density B = N*I / [Reluctance*A] increases.
The core is further towards saturation.


=====================================
(2B)+(2B)' ?

 

[electricpete]

Sorry, I was addressing the opposite scenario.

I discussed decrease in frequency which results in higher flux density, more towards saturation for a given test voltage, reduces the voltage at which saturation occurs.

op was discussing increase in frequency which of course results in lower flux density for given test voltage. In other words increases the saturation voltage as Skogsgurra said.

=====================================
(2B)+(2B)' ?

 

[electrolitic]

I have no option than to star to both posts. To Electricpete, his second one post.
Thanks Skogsgurra and Electricpete.