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16. commutator [ 'k mjuteit ] n. 換向器; 集電環
17. brush [ br ] n. 電刷
18. exciter [ ik'sait ] 勵磁機(器)
19. complete [ km pli:t ] a. 完整的
20. rectifier [ 'rektifai ] n. 整流器
21. pole [ pul ] n. 磁極
22. field [ fi:ld ] n. 磁場
23. armature [a:mtju ] n. 轉子; 電摳
24. is supplied with … 由…裝備成; 裝有
25. regulator [ 'regjuleit ] n. 調節器
26. develop [ di velp ] v. 引出
27. fed into 送入; 注入
28. stator [ 'steit ] n. 定子
29. CSD = Constant Speed Drive 恒速傳動裝置
30. accessory gearbox [ gib ks ] 附件(輔助)齒輪箱
31. critical [ kritikl ] a. 關鍵的; 要求嚴格的;極缺…的
32. absence [ 'æbsns ] n. 缺少; 不存在
33. transformer [ trænsf :m ] n. 變壓器
34. backup [ bækp ] a. 備用的, n. 備份;備用品
TEXT
[1] The electrical power is used for the control, operation, and indication of the
various airplane systems on the ground and inflight. The electrical power is
obtained from the battery, generator and ground support equipment. It is controlled
and monitored prior to distribution as 115 volt ac, 28 volt ac and 28 volt dc supply
to using systems .
[2] The alternating current power is supplied by two engine driven generators for
normal inflight operation. A generator, driven by the auxiliary power unit, can
supply all power for ground or flight operation. Power can be supplied on the
ground through the external power (ac )receptacle . The dc power is supplied from
the battery or conversion from the ac power.
[3] The ac and dc power is distributed to the various system through the left and
right load control centers in the flight compartment. The control and indication of
the electrical system is from the P5 overhead panel in the flight compartment .
Fig 11-1 electrical power
[4] The generators driven by the engine produce the ac power required by the
airplane systems primarily for flight operation. The ac generator is rated at 50
kilovolt-amperes, 120/208 volts, 400Hz. The unit is without slip-rings, commutator,
or brushes on either the main generator or the exciter. A complete generator
assembly consists of an exciter generator, a rotating rectifier and a main generator.
[5] The exciter consists of a six -pole dc field and a rotating armature. The exciter
field is supplied with dc power from the voltage regulator . This causes a 3-phase
voltage to be developed in the exciter armature. The 3-phase voltage is rectified and
fed into the ac generator rotating field. The rotating field generates the useful 115v
output voltage in the ac stator.
[6] The constant speed drive (CSD) is located on the left side of the engine, on the
front of the accessory gearbox . The purpose of the CSD is to convert the variable
speed of the engine to a constant speed for the driven generator to produce ac power
at constant frequency.
[7] The electrical power for the ground operation of all electrical loads on the
airplane is supplied by an external 3-phase, 115volt, 400Hertz alternating current
system. The power is supplied through an external power receptacle. The ac
external power receptacle is located on the right side of the airplane forward of the
nose wheel well.
[8] The battery is located in the electronic compartment, left side just forward of the
E2 rack. The purpose of the battery is to provide dc power to critical airplane
systems in absence of normal dc supply from the transformer rectifier. It is also used
as a backup power for the ac system control and protection and for starting the
APU.
[9] Three transformer rectifier units are located in the electronic compartment on E3
rack. The purpose of the 3 transformer rectifiers is to convert 115 volt ac ,400Hz,
3-phase power to 28 volt dc power for use by the airplane's systems.
[10] The purpose of electrical power distribution system is to provide and control
generated ac and dc power for use by the various airplane systems. the distribution
system consists of 115 volt ac, 28 volt ac and 28 volt dc power obtained from
generators and battery.
EXERCISE
A. Find out the explanations of the following words in your “English -Chinese
technical dictionary”
1. battery [P1-17]
2. generator [P1-68]
3. ground support equipment [ P1-72 ]
4. receptacle [P1-123 ]
5. excitation [P1-54 ]
6. stator [P1-144 ]
7. constant speed drive [ P1-35 ]
8. accessory gearbox [ P1-1 ]
B. Translate the following sentences into Chinese
1. The electrical power is controlled and monitored prior to distribution as
　
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