Transformer

I guessed, the number you mentioned are the electrical phase angles in degree for the primary phase voltages of the transformer.

First of all, you have to know what the vector group YNd1 mean, then it is easy to find the answer.

YNd1 means 'High Voltage winding of the transformer is Y connected with neutral terminal and Low Voltage winding is Delta connected. The phase angle of the LV winding lags the HV by 30 degrees (or the phase angle of the HV winding leads the LV by 30 degrees)'.

Nobody can answer your exact answer unless you mention the primary side of the transformer is High voltage or Low voltage.

Now, once you know the primary is either High voltage or Low voltage, apply the concept what you understand from the interpretation of YNd1 (especially the Bold sentence above), you will get your answer. I assumed you understand what lag or lead mean in terms of electrical phase angle.

- MS

I think if you draw the vector diagram of Primary & Secondary Voltage, Phase angle , you will be able to find ans of your query.