３相分の電流を一括して変流器に通すと、３相分の電流をベクトル合成した電流が２次側に流れます。ベクトル合成された電流はどうなるのでしょうか？実は対称３相交流３相分の電流を合成させると”０”になるのです。対称３相交流は、各相とも同じ大きさでそれぞれが１２０°ずつ位相がずれているのでこのようになります。
The initial reason I built this article was that for the duration of a latest floor fault from the technique, we found that a few of the relays were being tripping incorrectly (or mysteriously), that is, many of the upstream breakers had been tripped wondering it had been a ahead fault recent, when in reality, and we assumed, it should be reverse (i.
ZCT is a neutral CT that's determined by zero sequence present detection. What transpires in the course of leakage, The existing from the phases aren't the same & for this reason the in is not really equivalent to zero. This big difference of present flows in the neutral CT whicgh journeys the RCC
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Nominal CT ratio, ensuring the current is enough to run the earth fault relay whether or not the bottom fault is incredibly smaller.
電流には必ず行きと帰りがあり、通常その電流の大きさは同じになります。しかし地絡が発生すると、電流が正常な回路を通らずに大地を通って帰っていきます。これを漏電とも表します。
The ZCT is handled like every other CT: ratio, polarity, precision class (saturation). The only real thing to consider that is usually unique will be the physical measurement on the window considering the fact that you are going to operate all 3 period cables by that window.
Assuming that CBCT is working inside the linear area, then the magnetic flux created within the Main of CBCT are going to be specifically proportional to its corresponding line latest. For this reason it may be composed as:
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Performing principle of CBCT or ZCT Kirchhoff's latest regulation states that the whole present-day at each and every node of the electrical circuit will equivalent zero is the elemental tenet governing how zero sequence recent transformers run. The vector sum of A 3-phase program's phase present-day (Ia + Ib + Ic = 0) is zero through typical Procedure. For that reason, the main winding of your CBCT will likely not contain any leftover zero sequence here present-day.
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The earthing leads in the cable sheath to earth and has to be taken from the eye of the ZCT core. A typical diagram is as proven inside the beneath figure.
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The flexibility of your CT and relay to work less than these circumstances is actually a purpose of K’scc as well as transient performance of the relay, Ktd. The factor, Ktd is equipped via the relay company. Suitable performing is obtained by making sure the subsequent is legitimate: