HomeResourcesFAQsP-Level Current Transformers Can Determine Whether The Accurate Limit Factor Kalf Is Qualified By Measuring The Excitation Curve
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P-Level Current Transformers Can Determine Whether The Accurate Limit Factor Kalf Is Qualified By Measuring The Excitation Curve

P-level current transformers can determine whether the accurate limit factor KALF is qualified by measuring the excitation curve. The method is as follows:

1、 Measure the DC resistance RCT of the secondary winding and calculate the impedance ZCT=RCT+jXCT of the secondary winding. XCT can be ignored or taken as 0.1~0.2 Ω.

2、 Calculate the rated load impedance Zbn based on the rated load Sbn on the nameplate of the current transformer

Zbn=Sbn/Isn2

Isn is the rated secondary current

3、 Calculate the secondary induced electromotive force Es=KALFDsn (Zct+Zbn)

4、 Create an excitation curve with US ≈ ES. When searching for the US value on the excitation curve, if the excitation current Ie value is less than the value calculated according to the formula Ie=ε KALFIsn, it is qualified; otherwise, it is unqualified. ε is a composite error of 5% or 10%.

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