The zct Diaries

The zct Diaries

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In contrast to the current transformer (CT), the principal winding of CBCT is shaped with 3 core cables passing throughout the Heart of its iron core as well as the secondary coil of CBCT can be wounded on its ring-form iron core, and it truly is connected with earth-fault relay.

これらの理由より、基本は片端接地が採用されます。両端接地を採用する場合は、慎重に検討する必要があります。

電気の仕事を始めたばかりの人に役立つサイトを目指しますのでよろしくお願いいたします。

この場合はサブ変電所の地絡保護がしたいので、高圧ケーブルの保護は必要ありません。なのでシールドの接地線の処置は必要ありません。

This operation is important for exact latest measurement and program security, guaranteeing that monitoring products and protecting relays run correctly without having remaining subjected to large current levels.

A existing transformer is utilized to phase up or stage down alternating existing, in which CBCT or zero sequencer is employed as fault defense.

This triggers a trip system, proficiently isolating the faulted segment to circumvent problems and make certain protection.

これはケーブルのサイズ(誘導リアクタンスの関係)及び通電電流が関係してきます。

From its perform, you may be able to discover how CBCT or ZCT operates. The CBCT or ZCT functions by balancing zero sequence present in almost any 3 section process. This is the most important theory we want to remember ahead of leaping to the following rationalization.

Case 2: For the more info duration of an earth fault (say LG fault) within an irregular affliction, stage recent in 3 Main cables passing with the Middle of the current transformer won't stability.

電気設備設計の基礎知識 電気計算の基礎となる幹線設計やケーブルの選定方法、配線器具の計画、電線管の種類と使い分け。

・毎年数億円を超える設備投資案件の設計から施工管理、設備の立上げまでを担当

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。

Also,  you might want to Observe that the defend grounding is properly routed.  You will find a photo during the SR-750 guide that exhibits this.  Failure to correctly route the protect grounding will disable ground detection. outdated field dude