Hey! The questions that I need help with are originally in another language. I did my best to translate. Hope you understand. I just need the answers.
1. A single-phase transformer conversion ratio 5.The secondary side has 190 winding turns. The primary side is connected to 240V. At full load, the current on the secondary side is 15A.Calculate the apparent power of the transformer and the winding speed of the primary side. The transformer can be considered ideal.Apparent effect? Premiere winding speed?
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.
B. Calculate the efficiency at 25% overload and cos φ = 0.82. The secondary voltage is rated voltage.
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?
A. If uncompensated luminaires are used, they have cos φ = 0.5.
B. If compensated luminaires are used, they have cos φ = 0.95.
4. A current transformer has a turnover of 100 / 5A. On the primary side, a current of 80 A flows. What does the ammeter connected to the secondary side show?