Специальный текст TR-Unit

Профессиональный текст для специальности 25.02.03 "Техническая эксплуатация электрифицированных и пилотажно-навигационных комплексов"
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TR-UNIT

Each Transformer Rectifier Unit (TR) is supplied with 115 V AC/ 400Hz, three phase.

Its nominal current output is 200 A at a voltage of 28 V DC.

The TR's are switched to the corresponding DC busses via contactors, which are controlled by the TR's itself.

In case of overheat (>171_C) or minimum current detection (< 1 A), the TR contactor is switched off and locked open via the latching relay K 1.

For TR 2 an open latching  of the contactor after minimum current detection is inhibited during ground service operation (contactor 3PX energized).

RESET of a TR is possible either via the CFDS or a common RESET pb-sw.(15PU) on the relay panel 103VU in the middle right avionics compartment.

Parameters of voltage and current of a TR are delivered to the ECAM system by the

TR and displayed on the system display (SD).

 

 

TR-CONTACTOR CONTROL

The TR CNTR's 5PU1,2 and 3PE serve for connecting the DC BUSSES 1, 2 and ESS with their corresponding TR.

The ON switching conditions are:

- no TR fault and

- 28 V DC TR output

For the switching logic of TR 2 contactor a third condition is necessary: 5PU2 is only switched on, when the AC supply for TR 2 comes from AC BUS 2(contactor 14PU energized) and not from ground service.

 

TR-UNIT -CFDS UTILIZATION

When a TR has been switched off automatically due to a failure, its contactor keeps open latched.

A reset is possible via the CFDS, as it is seen on the next page.

Vocabulary.

Transformer Rectifier Unit [trænsˈfɔːmə ˈrektɪfaɪəˈjuːnɪt] - трансформатор-выпрямитель

 The current output [ˈkʌrənt ˈaʊtpʊt] – ток на выходе

 

 To switch [swɪʧ] – включаться, переключаться

 

 the latching relay læʧɪŋ rɪˈleɪ] – реле с самоудержанием

 

 inhibit [ɪnˈhɪbɪt] – препятствовать, тормозить

 

 energize [ˈenəʤaɪz] - возбуждать

 

 utilization [juːtɪlaɪˈzeɪʃn]  - использование

 

 failure [ˈfeɪljə] - отказ

                                                         

 

 

 

Exercise 1.

Complete the sentences with the following words.

Parameters of voltage and current of a TR, for connecting, due to a failure, avionics compartment, inhibited

 

  1. For TR 2 an open latching  of the contactor after minimum current detection is …. during ground service operation.
  2. RESET of a TR is possible either via the CFDS or a common RESET pb-sw.(15PU) on the relay panel 103VU in the middle right….
  3. …. are delivered to the ECAM system by the TR and displayed on the system display (SD).
  4. The TR CNTR's 5PU1,2 and 3PE serve ….. the DC BUSSES 1, 2.
  5. When a TR has been switched off automatically…., its contactor keeps open latched.

 

 

 

 

Exercise 2.

Answer the questions.

  1. What current each Transformer Rectifier Unit (TR) is supplied with? 
  2. What is its nominal current output?
  3. How are the TR's switched to the corresponding DC busses?
  4. When the TR contactor is switched off and locked?
  5. What are the ON switching conditions for TR-contactors?
  6. What third condition is necessary for the switching logic of TR 2 contactor?
  7. When a TR has been switched off automatically due to a failure, its contactor keeps open latched. How a TR reset is possible?

 

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Завьялова С. О.
Английский язык, СУЗ, Уроки