1. A single-phase transformer for 230 / 115V has a rated power of 1.1KVA. The transformer can be considered ideal. Each luminaire has a 36W fluorescent lamp and a reactor that takes 8 W. How many...

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1. A single-phase transformer for 230 / 115V has a rated power of 1.1KVA. The transformer can be considered ideal. Each luminaire has a 36W fluorescent lamp and a reactor that takes 8 W.
How many fluorescent luminaires can be connected to the top of the transformer without it being overloaded?

If uncompensated luminaires are used, they have cos φ = 0.5.( The answer is not 12.5)

2. A single-phase transformer of 25 KVA has an idle loss of 150 W. The load losses at rated current are 500 W.

A. Calculate the efficiency at half load and cos φ = 0.77. The secondary voltage is rated voltage.(Answer must be in procent)

B. Calculate the efficiency at 25% overload and cos φ = 0.82. The secondary voltage is rated voltage.(Answer must be in procent )

Answered Same Day Mar 21, 2021

Solution

Rahul answered on Mar 21 2021

163 Votes

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1. A single-phase transformer for 230 / 115V has a rated power of 1.1KVA. The transformer can be considered ideal. Each luminaire has a 36W fluorescent lamp and a reactor that takes 8 W. How many...

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