If 220/60kV transformers YNd11 connection with 220/69/10kV transformer YN, yn0, d11 connection, this two 60kV transmission system electrical angle difference of 30 °. When the three-phase air circuit breakerschematics 220/110/35kV transformers YN, yn0, d11 connection, 110/35/10kV transformers YN, yn0, d11 electric meter these two 35kV transmission system voltage phasor is also poor 30 ° electrical angle.
Therefore, the decision of 60 and 35kV winding connection should be careful when, connection must conform to the transmission mcb circuit breaker phasor requirements. According to the relative relationship between the voltage phasor Decision 60 and 35kV level winding connection. Otherwise, even if the capacity is right, the voltage ratio is right, the transformer can not be used, then the law is wrong, transformers and transmission systems and networks can not.
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