35kv step-down transformer, connection group Dyn 1 1d0 dual-output transformer. What connection group should I use to connect a step-up transformer later? How to connect the wires between 6 phases?

1. If you are a rectifier transformer, there are two sets of outputs, which are 30(330) degrees out of phase or in phase with the input coil. You want to connect a step-up transformer at the output, right? I don't know why you did it. What is the output of this step-up transformer used for? Is it related to the original power supply or is there any requirement? Why can't we set up a step-down transformer to change the voltage directly from the power supply?

If you must do it your way. Then your new step-up transformer can only have one set of AC inputs. Any transformer can only have one primary AC power supply (unless another DC power supply is input in some cases).

So you can only choose a set of coils from the output of this D-connected or Y-connected rectifier transformer, and it is impossible to input both at the same time. Unless there are two step-up transformers connected to D or Y respectively at the same time. Then the two step-up transformers run in parallel (at this time, the vector diagram between them must be drawn, and attention should be paid to the accuracy of the connection mode). The new step-up transformer can be connected with Dd0 (which can be in phase with the original power supply), Dy( 1 1, 1, 5 or 7), YYY0, etc. However, isn't it boring?

3. If it is a rectifier transformer, there is a connected rectifier cabinet behind it. You connect another step-up transformer at its output end, which increases the output of a set of coils, which will destroy the balance in the original rectifier transformer coils, which is very unsafe.