Question

Q3. The power rating and the voltage ratio of the power transformer and the CT ratio are show in Fig 3. Determine the transformation turns ratios and the connection of the interposing transformers required in order to set the differential relays, which are provided with taps. Draw the complete three- phase connection schematic diagram and identify the currents in each of the elements. 150/ 5Y 115 Transformer Vector group: Primary secondary: Yd5 Primary.tertiary YO 1151V2SMVA13V SMVA SMA 2005 MSR, SVA ST soos " 35

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Answer 1

15015 3 0015 (15kv25mun 13. 2KV, SMNA 3016 34.5kV,25mg Sool5 305 500K 30

„HLH CTracto 1505 tum ratio =) 30 :1 2) CTratio tune ratio =) Loo:1 3) CT ratio tune Yatio + 60:1 50015 30015 150/5 NI = I2 N2 too -I2 60 -I = 30 - I2 I -I lou 60 30