Учебное пособие предназначено для бакалавров всех специальностей и направлений подготовки радиотехнического факультета. В нем представлены материалы для аудиторной и самостоятельной работы

F The … (PT) steps down voltage of a circuit to a low value that can be effectively and safely used for operation of instruments such as ammeters, voltmeters, watt meters, and relays used for various protective purposes.
G The … (CT) steps down the current of a circuit to a lower value and is used in the same types of equipment as a potential transformer. This is done by constructing the secondary coil consisting of many turns of wire, around the primary coil, which contains only a few turns of wire. In this manner, measurements of high values of current can be obtained. A current transformer should always be short-circuited when not connected to an external load. Because the magnetic circuit of a current transformer is designed for low magnetizing current when under load, this large increase in magnetizing current will build up a large flux in the magnetic circuit and cause the transformer to act as a step-up transformer, inducing an excessively high voltage in the secondary when under no load.


TASK 9. Watch the video about ABB transformers presenting the process of design and construction and complete the sentences with appropriate words and phrases.
1. Transformer designers … the important data. 2. The core is made up of … laminations. 3. The highest level of precision is guaranteed because of … of sheets. 4. For the windings the manufacturers use insulated electrolytic …. 5. Factors taken into account during production are …, … expectations and electric and …. 6. During the work any kind of … should be avoided. 7. Drying process is crucial as … may deteriorate performance. 8. Tank designs are affected by such factors as the …, … and …. 9. Weld testing usually includes: …, … and ultrasonic …. 10. Manufacturing process can be accommodated to special … , such as cooling systems, …, …, … on load tab changers and …. 11. Transformers can be tested in following types of tests: … and switching impact test; induced …tests; … tests.


TASK 10. Match the words in column A with the words from column B to create whole phrases.

Expressions with verbs:

1. to evaluate 2. to take 3. to jeopardize 4. to meet 5. to subcontract out 6. to exercise 7. to accommodate

a) special customer requirements b) responsibility c) relevant data d) transformer performance e) requirements f) work g) precautions to avoid smth

Expressions with adjectives:

1. tailor- 2. highly- 3. cost- 4. closely- 5. stringing 6. on

a)overseen b) efficient c) made designs d) standards e) site test f) trained staff