Talk about the circuit shown in the following picture.

 

Talk about the circuit shown in the following picture.

 

10. Translate orally and put some snap into it:

Преимущество, суммарный линейный ток, poor conductor, управление, decrease, alternating circuit, components, to feed, ток, поток, to complete the circuit, electrical, комбинированная цепь, выключатели в цепи, to emit, сопротивление, точка, starting point, энергия, проволочный резистор, изменять, size, substance, физический, voltage, снабжать, изолятор, длина, structure, движение, постоянный резистор, varistor, series circuit, цепь с параллельным соединением, диэлектрический, to open the circuit, frequency, строение, регулируемый резистор, проводка, wire.

 

Make up the summary of the text and retell it.

III. LESSON 3. MAIN SWITCHBOARD (MSB)

1. Read and memorize the following words and combinations:

to distribute - распределять

to contain - содержать

accessories - дополнительное оборудование (вспомогательное)

switch - переключатель

starting switch - пусковой

starting button - кнопка пуска

circuit breaker - выключатель цепи

protection - защита

measure -измерять

to be arranged - устанавливаться

handle - рукоятка

front side - передняя сторона

passage - проход

to allow - позволять, допускать

supervision - надзор

manually - вручную

remotely - на расстоянии, удаленно

network - сеть

lantern - фонарь

emergency - вспомогательный, запасной

socket - патрон (электрич. лампы)

echo - sounders - микрофон, переговорное устройство, эхолот

log - лаг

consumers - потребители

 

2. Read and translate the following text:

MAIN SWITCHBOARD (MSB)

The electric energy in the ship's electrical system is produced by electric generators. After that, the electric current comes to the main switchboard which is the central distributing station on board. The MSB effects distribution of electrical energy between the consumers.

The MSB is a special metal structure which contains different equipment and accessories. The basic elements of each MSB include the following equipment:

1. The switching equipment which serves to close and open electric circuits. This equipment includes starting switches, circuit breakers, starting buttons, etc.

2. Starting and control equipment which includes rheostats, regulators and controllers.

3. Protection equipment which includes safety devices, fuses, all sorts of protective relays, etc.

4. Signalling and measuring instrumentation.

The MSB is arranged with maximum safety precautions. The front side contains only signaling and measuring instrumentation. All other equipment along with current-conducting parts is mounted in the back side. However, all the equipment can be controlled and regulated by means of special handles and switches which are located in the front side.

Main switchboards are usually installed in the electric power plant rooms. However, MSB are surrounded by passages about 0.6 - 1m wide. The width of the passages depends on the ship's dimensions and the length of the MSB. The entrance to the MSB room is closed with doors equipped with special devices which can hold the door in the open position.

All the instrumentation and measuring equipment of the MSB allows to enable constant monitoring and supervision of the power plant. The power plant operation can be controlled either manually or automatically. The power plant control can be also effected remotely from the central control room or from the bridge.

The electric energy distribution is effected by means of special distributing means. Each ship has the following electrical networks:

1. Power network. It supplies electric energy to drive engine room mechanisms and other ship's equipment.

2. Lighting network. It is used to enable lighting of all ship's rooms and open decks. Lighting network also provides signaling lanterns and navigational equipment with electricity.

3. Emergency lighting network. It is independent on the main lighting network. Emergency lighting is used to illuminate corridors, life-boat areas, control rooms in case of emergency.

4. Weak current network: It effects electricity supply for telephones, telegraphs, fire alarm, etc.

5. Portable-lighting network. This network supplies sockets of portable lamps and lanterns.

6. Electric navigational equipment network. It is used for supplying gyrocompasses, echo-sounders, electromechanical logs, etc.

 

3. Find the English equivalents in the text:

распределительный щит, осветительная сеть, рычаги, измерительные инструменты, дополнительное оборудование, приводить в движение, производиться электрогенераторами, электрический ток попадает на главный распределительный щит, распределять электрическую энергию между потребителями, замкнутая цепь, разомкнутая цепь, включать предохранительные устройства, быть окруженным проходами, контролировать вручную или автоматически, быть оснащенным специальными устройствами, независимый от главной осветительной сети.

True or False?

1) The electric energy in the ship's electrical system is produced by electric generators.

2) The MSB is a special rubber structure which contains different equipment and accessories.

3) The front side of the MSB contains only signaling instrumentation.

4) Main switchboards are usually installed in the engine room.

5) The entrance to the MSB room is closed with doors equipped with special devices which can hold the door in the closed position.

6) All the instrumentation and measuring equipment of the MSB allows to enable constant monitoring and supervision of the power plant.

7) Power network supplies electric energy to drive engine room mechanisms and other ship's equipment.

8) Emergency lighting network depends on the main lighting network.

9) Portable-lighting network supplies sockets of portable lamps and lanterns.

10) The power plant control can’t be effected remotely.

 

5. Answer the questions:

1) What is switchboard?

2) What MSB stands for?

3) What equipment does MSB include?

4) What kind of safety precautions is the MSB arranged with?

5) How can all the equipment be controlled?

6) Where are usually main switchboards are installed?

7) Are they surrounded by passages about 2 m wide?

8) Can the power plant be controlled manually?

9) What does power network supply?

10) What does lighting network enable?

11) Is emergency lighting network independent on the main lighting network?

Why?

12) What does weak current network effect?

13) What does portable lighting network supply?

14) What is electric navigational equipment is used for?

 

6. Translate the following into English:

– Привет, сегодня на уроке мы проходили главный распределительный щит, и мне кажется, я опять что-то не понял.

– Hello. So, you’ve studied the work of the MSB, haven’t you? What do you know about the MSB?

– Я знаю, что весь электрический ток поступает на главный распределительный щиток, где затем распределяется между потребителями.

– Right you are! And what safety precautions is the MSB arranged with?

– На передней панели расположена измерительная и сигнализационная аппаратура. Все остальное оборудование установлено на задней панели. Однако, все оборудование может включаться с помощью специальных рукояток и переключателей, расположенных на передней панели.

– I quite agree with you. Do you know how the MSB are usually installed?

– Да. Обычно главные распределительные щиты устанавливаются так, чтобы они были окружены проходом, шириной 0.6 - 1 метр.

– I guess you know the topic perfectly. What do you have difficulty with?

– Я не понимаю, почему аварийная осветительная сеть работает независимо от главной осветительной сети.

– That’s simple. Emergency lighting is used to illuminate corridors, life-boat areas, control rooms in case of emergency.

– Спасибо! Наверное, я прослушал это.

– You are welcome!

 

7. Find the match in the gap below:

Supervision Network Weak current network Entrance Can be effected remotely Echo-sounder The length of the MSB

Сеть Длина распределительного щита Вход Надзор Электросеть слабого тока Эхолот Может осуществляться на расстоянии