Very good vedio brorher i would like to little add more things. Which transformer showed that is single phase double leg for three phases three legs are to be used. Xfmr efficiency means at the time of design we see the transformer loses messurements systems to calculate the quality of transformer. To protect the transformer lv side calculated amparage circuit breaker is to be used so that is will trip before cross the limit of lv side current which is roughly happen 2 and half times of the total kva ratings of given transformer.. Tap changer swich is required to maintain the customer required voltage supply which is mostly two times plus and two times minus with increment of 2.5% at a time happen in dist zfmr. Dyn11 is to be used for distribution xfmr and YNd1 is for power tramsformer to keep the level sustained. Transformer oil is brand name actually it is octane no combustible gases free mineral oil for cooling and insulating purposes. Neautral and earthing should be combined but never combine at home unless other wise earth fault circucuit intrupter will not work at home but for transformer safety is good idea. Temprature is shown ia called ambient temperature which is environmental temp and always windinding temp 5 degree remains higher than oil temperature its normal. Impedence always in % if you short lv winding and gradually raise voltage from hv side from zero to upward with rhostate when it reaches to the calculated amperage of lv side this is proportional to the hv side of % this is called impedence percentage. I think it will helpful for readers.
Best explanation I have ever seen on RU-vid. Thank you Sir. Learnt valuable concepts. Looking forward to have more videos. I am preparing for Assam Power Distribution Company Limited entrance exam. Please provide some exam oriented materials so that it could be helpful. Looking forward to your tutorial Sir.
Your Knowledge was good , But you missed some part in DYN11, you didn't explained what 11 is for . And you have to work on your speech delivery , there were some errors. Overall it was awsome , keep going .