问题 问答题 简答题

发电机的冷却方式及冷却原理。

答案

参考答案:

发电机采用水氢氢的冷却方式,即定子线圈及出线套管采用水内冷,定子铁芯及转子采用氢气冷却。采用氢气冷却是利用其比重小、导热系数大的特点。发电机动静间隙之间的气体,经转子两端的风扇抽吸打压,经氢冷器冷却后,分别从发电机的两端两侧进入定子铁芯和转子线圈,再分别流过定子铁芯和转子线圈的腰圆形间隙,汇入动静转子间隙,再被风扇抽走,实现循环冷却。定子冷却水从固定端进入发电机定子冷却水水环,在全周方向上流经定子线圈中心孔,至扩建端出水水环汇集,回水至定子水箱。

填空题

Marks & Spencer has a very good reputation for job security and looking after its staff, with things like good perks, (1) , that sort of thing. Do those things actually (2)
I think it is, it is very important. When people have been working (3) , and they may have been in from seven or eight o’clock in the morning, they can come off the sales floor and can go to (4) and obviously they can have tea, coffee, or (5) , and can then buy at very reduced rates (6) , if they want one, or a roll and cheese, in a pleasant environment, (7) , food of the highest quality, there’re areas where they can (8) , or play pool or something, yeah, that is very important because they need (9) . At busy times, they need to get away from it, they need to be able to relax. In terms of all the (10) we’ve got, that is very important, when people know that they will be having medicals, and (11) is another thing, obviously there’s (12) that they will buy which they will be able to buy (13) . For Christmas bonus, we give all our general staff (14) which is guaranteed, and the (15) of that, actually, at the busiest time of the year when they’re (16) and working hard, is fantastic and to see their faces as you (17) with 10% of their salary in it. I believe the environment that you work in, (18) that you work with, the way you are treated, (19) , and the fact that your views are listened to, and you feel you are consulted, that makes people (20) and makes them get up and come to work in the morning.

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