三相交流電源のそれぞれの相に流れる電流のベクトルの和は通常は対称であるためゼロとなりますが、地絡電流が流れた場合にはそのバランスが乱れてゼロ以外の値を持ちます。

This way, we will never obtain any remainder of zero sequence existing from the CBCT primary winding. Because it is often a well balanced a few section, there will not be any flux generated while in the CBCT Main. Thus, the current inside the secondary winding is zero.

　最後にここまでのおさらいとしてもう一度変流器と零相変流器の違いを示します。

From its function, you might be able to decide how CBCT or ZCT operates. The CBCT or ZCT will work by balancing zero sequence present-day in any 3 period system. This is actually the major basic principle we need to recollect ahead of leaping to the following clarification.

As opposed to common transformers, which might be mostly utilized to measure phase currents, HY ZCT deal with capturing zero sequence currents. This zero sequence element implies an unbalance or fault issue during the process.

Because just about every stage recent produces its individual magnetic flux in precisely the same core, the frequent k is identical for everybody.

The ZCT is dealt with like another CT:  ratio, polarity, precision course (saturation).  The only real thing to consider that is commonly distinctive is the Actual physical sizing of your window considering the fact that you're going to operate all a few period cables as a result of that window.  

　ご覧のとおり、決定的な違いは変流器に通す主回路の電線です。通常の変流器であれば１つの変流器に１相分の電線を通し１相分の電流を変流器２次側へ取り出します。

したがって、通常状態（事故が生じていない）では変流器の２次側には電流は流れていません。電流の不平衡があっても、地絡事故が起きていない限りベクトル合成すると打ち消している状態になりますので、ＺＣＴ２次には電流は流れません。

　ところが零相変流器では３相分（交流は通常３相交流で送電されています）の電線を一括して変流器に通しています。このように変流器に電線を通すと２次側にはどのような電流が流れるのでしょうか。

To locate the direct resistance Rleads (two leads – offer, return) we can utilize the normal formulae for resistivity:

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Zero sequence recent transformers operate around the principles outlined by Kirchhoff’s Latest Law, which states the algebraic sum of your currents entering a node will have to equal zero below usual circumstances.

Subsequently, the magnetic flux essential to provide a specific secondary existing is lowered to 1-3rd (1/3), and that is the very best profit presented the enhanced Over-all sensitivity from the protecting method.