2021-11-09
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Exercise 1. Choose the correct answer
1. A transformer is used … a) to change the frequency in a circuit
b) to change the voltage in a circuit
2. Electric power is transferred at a high voltage and reduced to any value due to …
a) transformers
b) rectifiers
3. A transformer consists of … a) a core and windings
b) primary and secondary windings
4. The function of the primary is
…
5. The function of the secondary
is …
a) to receive energy
b) to supply energy
a) to receive energy
b) to supply energy
6. A step-up transformer in-
creases the voltage …
a) on its primary winding with respect to the secondary
b) on its secondary winding with respect to the primary
7. In a step-down transformer … a) the number of turns of the secondary
winding is greater than the number of turns of the primary
b) the number of turns of the primary winding is greater than the number of turns of the secondary
Exercise 2. Complete the sentences using while
1. The secondary winding of a transformer is connected to the load
resistance …
2. The primary winding receives energy …
3. A step-down transformer decreases the voltage …
4. In a step-up transformer the number of turns of the secondary
winding is greater than the number of turns of the primary winding …
Unit 3. Substation
Vocabulary
bus шина
control house диспетчерский пункт distribution substation распределительная подстанция emergency авария; непредвиденный случай
end-user конечный пользователь
grounded neutral заземленная нейтраль
power blackout отключение электроэнергии
power line carrier высокочастотная связь по проводам ЛЭП
power transformer силовой трансформатор
residential customer бытовой потребитель электроэнергии
supervisory control диспетчерское управление
switchboard panel распределительный щит
switching point переключательная подстанция
transmission substation передающая подстанция
