Hello Dharini,
if you are using the transformers purely as sensor's, you can add simscape voltage and current sensors, and then scale those values down to the correct signal level that you would see in your application. You could add a transfer function to model the dynamics of the transformer if you need that level of fidelity of the transformer.
Alternatively, simscape electrical has all the blocks you needs (transformer blocks) to create actual models of the transformers and include them directly in your model. This will be more computationally expensive in regards to simulation time.
Regards,
Joel
