问题 问答题 简答题

简述600MW发电机转子一点接地时的处理。

答案

参考答案:

(1)汇报值长。

(2)加强对励磁系统的监视,当发现转子电流增大而无功出力又明显下降时,应立即停机。

(3)若检漏计或湿度仪报警与转子一点接地信号相继发出,或同时检查到发电机有漏水、漏油故障时,应立即停机。

(4)如接地的同时发电机发生失磁或失步,应立即停机。

(5)检查接地检测装置工作是否正常,进一步核对绝缘检测装置的绝缘数值,切换转子正、负极对地电压指示,判明接地极和接地程度。

(6)对励磁系统进行全面检查,有无明显接地,若为滑环或励磁回路积污引起时,应联系检修人员采用吹灰器或压缩空气进行吹扫。

(7)联系并配合检修人员查明故障点和性质。

(8)如为转子外部接地,由检修人员设法消除。

(9)如为转子内部稳定性的金属性接地或接地点在外部但必须停机才能消除时,则汇报值长,申请尽快停机处理。

(10)如转子接地保护二段动作跳闸,则按照事故跳闸处理,如保护拒动,则立即将发电机解列灭磁。

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Planet English is the world's leading interactive multimedia software package for English language teaching and learning.

For Students

Planet English uses the latest in multimedia and information technology to support students who wish to learn English for international communication.

Planet English is an exciting, high-tech, interactive way of learning English. It contains more than 40 hours of video and audio recordings, over 2,500 0riginal graphics, 3,000 interactive screens and 80 different activity types including real time student voice recordings.

For Teachers

Planet English is more than just a computer program. It includes a package of resources to complement any Eng-lish language teaching programme. Teachers can easily integrate Planet English with classroom activities using the detailed Teacher's Manual(手册) and Student Workbooks.

Teachers can also manage the learning experience for students using the unique Planet English Courseware Management System (CMS). The CMS allows teachers to tailor courses to their syllabus(课程提纲) and to students' needs by "mapping" content for classes or individuals. Activities and exercises that are relevant to the center's syllabus are then delivered to students in the appropriate lesson, ensuring students "navigate" to the right area of the programme of each lesson.

For Educational Managers

Planet English is the world's leading Computer Assisted Language Learning (CALL) program. It allows English language teaching centers to enhance the educational quality of teaching programmes, improve learning outcomes and provide professional development for teaching staff. Implementing(实施) Planet English allows English language teaching centers to maximize the benefits of computor hardware because it provides teachers and learners with an easy-to-use and highly productive CALL resource.

小题1:The main purpose of this passage is to         

A.encourage more people to attend the Planet English course in time

B.promise everyone can learn English well without teachers

C.call on people who learn or teach English to interact with English speakers

D.introduce an interactive multimedia software for English learners, teachers and managers小题2:Which of the following is true about Planet English according to the passage?

A.Planet English can support the students who study computer.

B.Planet English can help the students and their teachers interact.

C.Planet English makes it possible for students to communicate with speakers from around the world.

D.Planet English offers only a range of spoken communication for students.小题3:The underlined word "mapping" means          

A.making a map of

B.making a survey of

C.making a detail planning of

D.establishing a mapping of小题4:Planet English, as described in the passage,           

A.is attractive to students because it combines English learning with computer games

B.is popular with the teachers because they can manage the learning experience with the help of CMS

C.is designed for the educational managers to evaluate the teaching staff

D.is provided to students, teachers and managers for free小题5:What is NOT the characteristic of Planet English?

A.Interesting.

B.Interactive.

C.Practical.

D.Efficient.