There's a slight complication inside the makers know their relays much better than we (or perhaps the IEC) do. As normal assistance, you need to normally check with the companies information:
This permits to optimization on the secondary turns based on the powerful Principal pickup recent of CT.
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。
"Defense" CT's are built so as to retain accuracy at recent degrees considerably in excess in their nominal values, ordinarily twenty periods nominal, in an effort to insure appropriate illustration of currents beneath fault disorders.
一般的な変流器と同様に、円環状の鉄心にコイルを巻き付けた構造を持ち、円環の中央に導体が貫通しています。
회로를 통하지 않고 대지를 통해서 돌아갑니다. 이것을 누전 이라고도 합니다.
The way in which floor fault is detected is through 50G (Pickup=2A, TD=about 2sec) and also by means of the 59G and 67G, nonetheless the designer clarifies the 59G/67G, is only for backup security. The principal security need to nonetheless be 50G, which someway generated various GF when period B was faulted (as shown while in the relay log), for which the sytsme was registering mutilple ground faults "mysteriously" somewhere else downstream of the tie breaker (diagram). But ahead of I digressing into various matters, I want to point out dependant on the program I've explained so far, are we using the ideal CT for this programs? Many thanks.
このように電流の不平衡が生じることで地絡検出が可能なのですが、シールドがあることで地絡しても不平衡が起きなくなります。
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。
ただし通常の変流器は貫通する導体は１本ですが、零相変流器の場合は３相分の３本となります。
Floor Fault Detection: One of several key apps in the HY-ZCT is ground fault detection. By measuring zero sequence current, these transformers can identify the existence of ground faults, which take place when present flows from a period conductor to ground.
Considering the fact that electrical motors are delicate to surge present-day that will make them crack, CBCT check here is mounted to prevent any earth fault to have an effect on the motor. Allow’s say We have now A 3 phase motor, we put in the CBCT with its Main getting passed by way of by all the 3 section motor wires.
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