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Do you know how to physically explain this peak in the exciting current? Is this because of when the core is saturated the exciting current increases more quickly?
For the primary side (with the secondary opened), using a resistor of 9.7 ohm, I`ve got 241 mV (24.85mA) with a phase shift of -63 and the voltage in the terminal of the transformer was 228V.
And for the secondary side, I`ve got 0.96V around the resistor (98.97mA) with a phase shift of -62. The...
I applied the rated voltage in both sides and measured the current, so I got in the inductance value. But applying the rated voltage in both sides does not give me the same level of excitation in both measurements, so that`s why I got different values for the relative permeability, am I right...
I performed the tests applying the rated voltage to each side of the transformer and I measured with a scope the current in a small resistor and I calculated the value of the magnetizing inductance. But when I put in the formula to find ur (relative permeability), i find two very different...
So if use a resistor and a capacitor with these same values (because the frequency of the applied voltage is 50 Hz), should I observe the B-H characteristic of the core? Do I need to plot the voltage in the capacitor versus the current flowing through it?
Do you think I can also calculate the leakage inductance using this method too? To measure the leakage inductance I have to short circuit the secondary, but if I do it, the voltage that I can apply to the primary side (without burning the transformer) is smaller. So I was thinking about applying...
If I apply 230 V in the primary to measure the inductance (connecting a series resistance and measuring the voltage drop), can I do it with a multimeter or do I need a scope to measure also the phase?
The main objective of these measurements is to find the value of µr for the core material. So I measured the leakage inductance and the total inductance in each side and with these values I could find the magnetizing inductance, so I could apply the formula Lmag=(µo*µr*N²*A)/lm. But as the...
Hello,
I'm measuring the inductance in a 4.5VA transformer (230V/18V) with an LCR meter (PM 6304) in 50 Hz (operation frequency).When I measure it in the primary side (with the secondary side opened), I get 14,980 H and when I measure the secondary inductance (with the primary opened), I get...
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