PCT701 DC Immune Current Transformer  China manufacturer

Electrical Specification

(Customized is available)

Rated Primary Current	5A
Max Primary Current	50A
Rated Secondary Current	2mA
Accuracy	0.1~2.0
Electrical Strength	3000VAC 1mA60s
Load Resistance	20Ω
Rated Frequency	50/60HZ

Causes of DC Component Misalignment of Low-Voltage Current Transformers
After investigation, it was found that the problem of DC bias magnetism generally exists in low-voltage current transformers, and its source is affected by the primary DC component. From a theoretical point of view, the correct transmission of low-voltage current transformers is affected by the harmonics generated by the DC component, and the iron core condition is also changed due to the excitation current generated by the DC component, but the changing magnetic the connection did not appear, which eventually led to the misalignment problem of the low-voltage current transformer. Under normal circumstances, technicians will use the half-wave current test method to study the influence of the DC component on the low-voltage current transformer.

Among the DC components, the half-wave current accounts for up to 32%. After passing through the primary winding, the half-wave current The magnetic permeability will change to a certain extent, and the decline range is obvious. In addition to the influence of the DC component, the working error of the current transformer will expand significantly, and the overall movement will move in the negative direction, which can also prove that its work is close to saturation. After the secondary winding, the current waveform of the current transformer changes more widely, and the negative value is significantly reduced.

After many experiments, the following conclusions can be drawn. Under the influence of half-wave current, the error of traditional DC Immune voltage transformer is quite large, and it shows a state of geometrical level rise. Even the smallest DC component will give low voltage The direct impact of the DC Immune current transformers causes them to be in error and out of the predetermined range.