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Selk
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Join Date: Dec 2016
Posts: 50

Knee Point Voltage from a Test Report

09/16/2026 11:23 AM

From this test report (CT), how to identify the saturation voltage (knee point) of the current transformer (CT).

for example on increasing voltage from 780V to 800V which is around increase in 2.5%, the current is increased to 100% (from 0.05A to 0.1A)

Am I reading it wrong?
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Rixter
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Join Date: Apr 2010
Location: About 4000 miles from the center of the earth (+/-100 mi)
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#1

Re: Knee Point Voltage from a Test Report

09/17/2026 2:12 PM

The knee point in a current transformer (CT) is the specific voltage level on its excitation curve where the iron core begins to saturate, meaning a small 10% increase in secondary voltage requires a 50% increase in magnetizing current.

From the data, it appears that at 0.05A (and above) the core is already saturated.

An increase of 100% in current (0.05 -> 0.1 A) results in only a few percent in voltage.
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