- •Memorize the words and word combinations and their equivalents.
- •Find the words and combinations of words in the text and translate the sentences containing them.
- •Read and translate the text.
- •Translate the word combinations from the text:
- •Point out the sentences in the text in which the word “to make” should be translated as “примушувати”.
- •Answer the questions.
- •Find the sentences in the text telling you about two problems facing the simple two pole dc motor. Text b Compensation for stator field distortion
- •Make sure that you know these words and word combinations.
- •Read and translate the text.
- •Answer the questions.
- •Text c Dynamo Design Variations
- •Read and memorise the words and word combinations.
- •Permanent magnet motor – двигун з постійним магнитом
- •Read and translate the text.
- •Answer the questions.
- •Listen to the words and word combinations from the text. Pay attention to their meaning.
- •Memorize the words and word combinations and their equivalents.
- •Read and translate the text.
- •Match the words and word combinations (a-e) to the sentences (1-5)
- •Answer the questions to the text
- •Say if the statement to the text is true or false
- •Translate the sentences paying attention to Indefinite Tenses in Active and Passive. Correct the mistakes in the sentences.
- •Text b Basic construction
- •Listen to the words and word combinations from the text. Pay attention to their meaning.
- •Memorize the words and word combinations and their equivalents
- •Read and translate the text
- •Match the words and word combinations (a-e) to the sentences (1-5)
- •Answer the questions to the text
- •Say if the statements to the text are true or false
- •Translate the sentences paying attention to Indefinite Tenses in Active and Passive. Correct the mistakes in the sentences.
- •Text c Principles of operation
- •Listen to the words and word combinations from the text. Pay attention to their meaning.
- •Find the words and combinations of words in the text and translate the sentences containing them.
- •Memorize the words and word combinations and their equivalents.
- •Read and translate the text
- •Match the words and word combinations (a-f) to the sentences (1-6)
- •Answer the questions to the text
- •Define the functions of Participle I and Participle II in the following sentences
- •Say, which of the sentences are in the Active and which are in the Passive Voice
- •Translate the sentences paying attention to the Sequence of Tenses
- •Translate the following Conditional sentences
- •Transformer Text a
- •Read and memorize words and word-combination
- •Make sure that you know these words and word combinations.
- •Read and translate the text.
- •Math the following English words with the Ukrainian ones.
- •Find English equivalents to the words:
- •Translate the word combinations from the text:
- •Answer the questions to the text.
- •Text b Operation at different frequencies
- •Read and memorize the words and word-combinations
- •Be sure that you know these words
- •Read and translate the text.
- •Text c Limitations
- •Make sure that you know these words and word combinations.
- •Read and translate the text.
- •Find the equivalents to the following.
- •Text d Construction
- •Read and memorise the words and word combinations
- •Read and translate the text. Cores
- •Find the equivalents to the folloving English words:
- •Point out English equivalents to the words:
- •Translate the word combinations.
- •Answer the questions.
- •Read the passage about steel cores. Retell it. Text e Windings
- •Listen to the words and word combinations from the text and memorize them.
- •Read and translate the text.
- •Match the English words and word combinations with the Ukrainian ones.
- •Insulation of windings
- •Text g Shielding
- •Supplement Speed control
- •Dc motor starters
- •Shielding
- •Autotransformers
- •Voltage transformers
- •Pulse transformers
- •3 Phase electrical power Transformer
- •3 Phase Transformer Delta and Wye Connections
- •Перелік скорочень
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Match the English words and word combinations with the Ukrainian ones.
strand – перемикач вихідних обмоток трансформатора
magnet wire – штабовий провідник
heavy current – регулювання
coating – емаль
enamel – лак
transposition – вирівнювати
switchgear – комутаційний пристрій
varnish – покриття
intermediate – переміщення
adjustment – великий струм
equalize – проміжний
strip conductors – обмоточний провід
tap changer – жила.
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Read the text and find English equivalents to the words:
виток, розміщати, нерівномірний, гнучкий, регулювання, твердий, з’єднання, розподіл, ізолювати, зовнішній.
-
Translate the word combinations.
very heavy currents; high frequency transformers; skin effect losses; multiple-stranded conductors; low power frequency; high-current windings; on-load tap changer; voltage regulation; distribution circuit.
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Answer the questions.
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What kind of wire is generally used for windings?
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What does the conducting material used for windings depend on?
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Comment on wires used for:
small power transformers;
larger power transformers;
very heavy currents;
high frequency transformers.
-
Find the wrong statement.
1. Primary and secondary windings of power transformers may have external connections.
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Primary and secondary windings of power transformers may have internal connections.
Text F
Insulation of windings
-
Read and translate the text. Pay attention to the words given below.
layer – шар
immerse – занурювати
transformer oil – трансформаторне масло
corona discharge – коронний розряд
capability – здатність
deteriorate – погіршувати
casing – корпус
seal – герметизувати
moisture – волога
ingress – доступ
medium – середовище
epoxy resin – епоксидна смола
impregnate – просочувати, промочувати
dirt – бруд
damp – волога
environment – середовище.
The turns of the windings must be insulated from each other to ensure that the current travels through the entire winding. The potential difference between adjacent turns is usually small, so that enamel insulation is usually sufficient for small power transformers. Supplemental sheet or tape insulation is usually employed between winding layers in larger transformers.
The transformer may also be immersed in transformer oil that provides further insulation. Although the oil is primarily used to cool the transformer, it also helps to reduce the formation of corona discharge within high voltage transformers. By cooling the windings, the insulation will not break down as easily due to heat. To ensure that the insulating capability of the transformer oil does not deteriorate, the transformer casing is completely sealed against moisture ingress. Thus the oil serves as both a cooling medium to remove heat from the core and coil, and as part of the insulation system.
Certain power transformers have the windings protected by epoxy resin. By impregnating the transformer with epoxy under a vacuum, air spaces within the windings are replaced with epoxy, thereby sealing the windings and helping to prevent the possible formation of corona and absorption of dirt or water. This produces transformers suitable for damp or dirty environments, but at increased manufacturing cost.
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Answer the questions.
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Must the turns of the windings be insulated from each other? Why?
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Is the enamel insulation sufficient for small power transformers?
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What is usually employed between winding layers in larger transformers?
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Comment on transformer oil functions.
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Speak on the alternative protection of the transformer windings by epoxy resin.