When Yd11 transformer using traditional analog differential protection, both sides of the current transformer secondary side need to use which of the following wiring forms ( ).

The secondary side of the transformer's star side current transformer should be connected to a triangle, and the secondary side of the transformer's triangle side current transformer should be connected to a star for the purpose of making the phases of the current transformer's secondary currents consistent. This question is more difficult, in the "Industrial and Civil Power Distribution Manual" and "Steel Design Manual" have relevant content.