5 Essential Elements For zct

5 Essential Elements For zct

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　下図は「非接地系統（＝６ｋＶ系統）」で地絡事故が生じたときの電流の分布です。

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From its perform, you could possibly work out how CBCT or ZCT operates. The CBCT or ZCT will work by balancing zero sequence present in any three stage method. This is actually the most important basic principle we need to recollect before jumping to the subsequent clarification.

Nominal CT ratio, making sure The existing is sufficient to function the earth fault relay whether or not the bottom fault is incredibly small.

Collection of CBCT or ZCT The following standards are used to pick the ideal zero sequence CT or CBCT. Nominal CT ratio: This should be established making sure that, even in the case of the slight floor fault, There exists adequate present to operate an earth fault relay.

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ベクトルの和の平均値は「零相電流」と呼ばれ、上記のような対称形の場合、零相電流はゼロとなります。

The section existing from one of three cables will have an unbalanced price. Therefore the zero sequence existing will take place within the secondary winding and circuit of CBCT.

.  It is a calculated value which can take into account the burden (resistance) on the relay, resistance of the CT windings and resistance on the leads:

 Main balance CT is mostly useful for earth fault safety (or earth leakage security) for medium voltage electrical techniques. A standard CBCT is as shown from the below figure.

High sensitivity: ZCT is very delicate and can detect even modest quantities of floor fault existing. This can help to forestall damage to machines and lessen the potential risk of electrical shock to personnel.

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受電設備の母線で１線地絡事故が発生した例を示します。地絡ということは、大地に電流が流れたということを指します。大地に流れた”地絡電流”は地絡した相以外の相の電線の対地静電容量を通って電流が流れます。