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。
Don't forget, the secondary winding is linked to the earth fault relay, it is going to protect the rest of the circuit with an additional hello there from the circuit breaker.
In distinction, the overall phase present won't be zero under irregular situations. A zero sequence latest will then flow in the CBCT secondary circuit as the period existing is outside of balance.
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Normally After i Have got a different neutral CT I use a committed relay for that input. Some relays have what is called a "sensitive earth" input. Dedpends on the application. In both circumstance, you must determine what you may have and the way to set the relay.
The earth link of our motor might be handed to your core with the CBCT from the cable sheath. The commonest three phase motor which has a CBCT may be observed down below. You may as well observe what CBCT existing transformer is.
The resultant flux is zero (Φr = 0). What this means is there isn't any latest flowing through the secondary circuit of our CBCT. Its earth fault relay received’t get operated since this can be a ordinary operation.
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。
電気設備に備えられた電路が大地と電気的に接続されると、その箇所に地絡電流として大電流が流れ込むため、重大な事故につながるリスクがあります。
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。
It saied at the time, but I check with again, will you be check that grounding concentrator of cable back again to grounding via ZCT?
This ring type present-day transformer can equilibrium the zero sequence existing from the three phase procedure. This is when it acquired its name for a Zero Sequence Existing Transformer (ZCT).
The 750 also allows you to setups fifty/51N aspects utilizing check here a derived worth with the a few stage inputs. These are create as "Neutral Recent" inside the setpoints.
The ability on the CT and relay to operate below these circumstances is actually a function of K’scc as well as transient general performance on the relay, Ktd. The issue, Ktd is provided through the relay producer. Suitable functioning is achieved by making certain the following is valid: