问题 问答题 简答题

发电机启动前的试验?

答案

参考答案:

1)、试验时主变500kV出口开关的两侧刀闸必须断开,主变500kV出口开关只允许跳合两次,其余部分发信号,高厂变6kV分支小车开关送至试验位置,送上开关的控制电源;

2)、发变组差动试验:合上发电机灭磁开关,高厂变6kV开关,主变500kV开关(两个均合),汽机主汽门挂闸,锅炉引风机、送风机、球磨机、一次风机开关在实验位置并合上,联系维护启动发变差动保护,联跳主变500kV开关、发电机灭磁开关、高厂变6kV开关,球磨机、一次风机,关主汽门,启动6kV工作备用、工作公用快切;

3)、断水试验:合上发电机灭磁开关,高厂变6kV开关,主变500kV开关(两个均合),定子冷水投入正常,维护摸拟发电机逆功率后拉开定子冷水泵,延时30s后,主变500kV开关、发电机灭磁

开关、高厂变6kV开关跳闸,主汽门关闭,启动6kV工作备用、工作公用快切;

4)、主汽门关闭试验:合上发电机灭磁开关,高厂变6kV开关,主变500kV开关(两个均合),汽机主汽门挂闸,联系维护摸拟发电机逆功率后,汽机手动打闸主汽门,经程跳逆功率出口,跳主变500kV开关、发电机灭磁开关、厂用变6kV开关,启动6kV工作备用、工作公用快切;

5)、励磁调节器A套手动、自动切换,B套手动、自动切换,A套、B套相互切换,整流柜风机电源切换正常;

6)、高变、主变冷却器电源切换试验正常。

问答题 简答题
阅读理解

阅读理解。

Bicycle Safety

Operation  Always ride your bike in a safe, controlled manner on campus(校园). Obey rules and

regulations. Watch out for walkers and other bicyclists, and always use your lights in dark conditions.

Theft Prevention Always securely lock your bicycle to a bicycle rack---even if you are only away for

a minute. Register your bike with the University Department of Public Safety. It's fast, easy, and free.

Registration permanently records your serial number, which is useful in the possible recovery of the bike

stolen.

Equipment

              

Brakes Make sure that they are in good working order and adjusted properly.

              

Helmet A necessity, make sure your helmet meets current safety standards and fit

properly.

                

Lights Always have a front headlight---visible at least 500 feet in front of the

bike. A taillight is a good idea.

Rules of the Road

Riding on Campus  As a bicycle rider, you have a responsibility to ride only on streets and posted

bicycle paths. Riding on sidewalks or other walkways can lead to a fine. The speed limit for bicycles on

campus is 15mph, unless otherwise posted. Always give the right of ways to walkers. If you are involved

in an accident, you are required to offer appropriate aid, call the Department of Public Safety and remain

at the scene until the officer lets you go.

Bicycle Parking  Only park in areas reserved for bikes. Trees, handrails, hallways, and sign posts are

not for bicycle parking, and parking in such posts can result in a fine.

If Things Go Wrong

If you break the rules, you will be fined. Besides violating rules while riding bicycles on campus, you

could be fined for:

No bicycle registration---------------------------------------------------$25

 Bicycle parking banned--------------------------------------------------$30

 Blocking path with bicycle ---------------------------------------------$40

 Violation of bicycle equipment requirement -------------------------$35

1. Registration of your bicycle may help you _____________.

A. find y our stolen bicycle

B. get your serial number

C. receive free repair services

D. settle conflicts with walkers

2. According to the passage, what bike equipment is a free choice for bicycle riders?

A. Brakes.

B. A helmet.        

C. A headlight.      

D.A taillight.

3. When you ride a bicycle on the campus, ___________.

A. ride on posted bicycle paths and sidewalks

B. cycle at a speed of over 15 mph

C. put the walkers' right of way first    

D. call the police before leaving in a case of accident

4. If you lock your bicycle to a tree on the campus, you could be fined _________.

A. $25

B. $30

C. $35

D. $40

5 What is the passage mainly about?

A. A guide for safe bicycling on campus.      

B. Directions for bicycle tour on campus.

C. Regulations of bicycle race on campus.    

D. Rules for riding motor vehicles on campus.