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A 50 KVA, 11000/400 V Δ-Y distribution transformer has a resistance of 1% and reactance of 7% per unit. What is the transformer phase impedance referred to the high-voltage side?
  • a)
    78.6 + j 608.2
  • b)
    72.6 + j 508.2
  • c)
    62.6 + j 908.2
  • d)
    65.6 + j 786.2
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A 50 KVA, 11000/400 V Δ-Y distribution transformer has a resista...
∴ Its base impedance

The PU impedance of the transformer is
Zeq = [0.01 + j 0.07] PU
So the high-side impedance in ohm is
Zeq = Zeq pu × Zbase
= (0.01 + j0.07) × 7260 Ω
= 72.6 + j 508.2
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Most Upvoted Answer
A 50 KVA, 11000/400 V Δ-Y distribution transformer has a resista...
Transformer is a type of electrical transformer that has a maximum output of 50 kilovolt-amperes (kVA) and a primary voltage rating of 11,000 volts (V) and a secondary voltage rating of 400 volts (V). This type of transformer is commonly used to step down high voltage power supply from transmission lines to lower voltage levels suitable for distribution in commercial and residential areas. It is also used in industrial applications for powering machinery and equipment. The transformer is designed to convert electrical energy from one voltage level to another, while maintaining the frequency and power of the input signal.
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A 50 KVA, 11000/400 V Δ-Y distribution transformer has a resistance of 1% and reactance of 7% per unit. What is the transformer phase impedance referred to the high-voltage side?a)78.6 + j 608.2b)72.6 + j 508.2c)62.6 + j 908.2d)65.6 + j 786.2Correct answer is option 'B'. Can you explain this answer?
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