Details, Fiction and zct
Details, Fiction and zct
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You will find a slight complication inside the brands know their relays a lot better than we (or maybe the IEC) do. As standard assistance, you must generally seek advice from the producers data:
この地絡電流が流れ続けているところで、零相変流器へ流れる電流をご覧下さい。零相変流器のところを流れる電流のバランスがくずれています。これによって零相変流器２次側には電流が流れるということです。
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"Safety" CT's are built as a way to sustain accuracy at present-day ranges considerably in excess in their nominal values, typically check here twenty instances nominal, so that you can insure appropriate illustration of currents underneath fault situations.
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。
Property / Scenario Studies / The difference between current transformer and zero sequence current transformer The distinction between existing transformer and zero sequence existing transformer
The resultant flux is zero (Φr = 0). This means there is not any recent flowing in the secondary circuit of our CBCT. Its earth fault relay gained’t get operated due to the fact this is the usual Procedure.
We will mainly use this sort of recent transformer as an earth fault security for medium degree voltage distribution. The widespread CBCT illustration may be found down below.
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。
. That is a calculated worth which usually takes into account the load (resistance) in the relay, resistance from the CT windings and resistance with the qualified prospects:
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The 750 also enables you to setups fifty/51N features employing a derived price through the three section inputs. They're build as "Neutral Existing" while in the setpoints.
The vector sum of A 3-section method’s stage present-day (Ia + Ib + Ic = 0) is zero during common Procedure. Therefore, the first winding of your CBCT won't contain any leftover zero sequence recent.