Whereas in abnormal ailments, the sum of section present will not be zero. Then mainly because of the unbalancing of period current, a zero sequence latest will circulation inside the secondary circuit of CBCT.
By doing this, we will not likely find any remainder of zero sequence existing during the CBCT Main winding. Because it is often a balanced three stage, there won't be any flux created in the CBCT core. Therefore, the current in the secondary winding is zero.
In an irregular problem, the sum in the a few section present-day just isn't zero. Since the procedure gets to be an unbalanced three phase system, the zero sequence present-day will get started flowing in the secondary winding of CBCT.
Zero sequence present transformer HY-ZCT is a latest transformer specifically accustomed to evaluate or detect the zero sequence part of present in 3 period electrical power procedure.
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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 Main equilibrium existing transformer (CBCT) is especially utilized for earth fault defense of electrical machines. Amongst its essential purposes is earth fault defense of induction motors, that's talked about below intimately.
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。
何らかの原因で３相の電流のバランスが乱れると、コイルに二次電流が瞬間的に流れ、地絡として検出されます。
Due to this fact, no flux will arise from the Core of CBCT. Because of this, the secondary circuit with the CBCT might be totally static.
To find the lead zct resistance Rleads (two potential customers – supply, return) we are able to make use of the common formulae for resistivity:
Not like The standard present-day transformer, the CBCT will get its Key winding through the 3 period wires passing throughout the ring at its Centre with the iron core. Its secondary winding is wound to your ring formed iron Main and connected to the earth fault relay.
「零相変流器」というのは、系統に地絡事故発生した際に「地絡電流」を検出して取り出す変流器をいい、「地絡保護」用に用いる変流器です。「３相のベクトル合成した電気を物理的に取り出す」ことができる仕組みになっています。具体的な役割・構造について説明します。
Due to this fact, the magnetic flux wanted to provide a certain secondary current is decreased to 1-3rd (1/three), which happens to be the very best benefit given the enhanced overall sensitivity in the protecting system.