Dear Sir, Typically CT phase angle error will be consistent or improve with frequency provided the CT is not forced into saturation. For 50/60/400 Hz applications in the general purpose and revenue grade parts, frequencies up to 2 Khz will be within stated accuracies. Due to the lamination design, above 2Khz will typically cause a reduction in the magnetic saturation of the part. For this application, we recommend using a nickel core device at as low a voltage output as possible. The nickel core units that we manufacture utilize thinner laminations than the general purpose silicon steel cores, and will exhibit less loss of voltage capability at 3 Khz. By using the devices below this saturation point, you should be able to get the same specifications at 3Khz that you would at the 50/60/400 Hz levels. We can assist you in selecting the proper part if you can let us know the input current and the output voltage you are looking for.
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