问题 问答题 简答题

简述600MW发电机发变组保护异常的处理原则。

答案

参考答案:

(1)保护装置出现任何异常时,值班人员均应汇报值长,联系继电保护人员,同时作好事故预想并根据需要对运行方式作必要调整。

(2)保护用PT、CT断线时,在保护未动作前,应退出相关保护,并及时处理。

(3)双重化配置的主保护其中一套退出,如发电机差动保护、主变差动保护、厂高变差动保护、励磁变差动保护,在汇报值长,申请调度同意后,允许机组运行不超过48小时,超时运行必须由生产副厂长或总工批准。

(4)不允许设备无主保护运行,发电机差动保护、主变差动保护、厂高变差动保护、励磁变差动保护不允许两套同时退出,因故需两套同时退出前,必须停运机组。

(5)主变重瓦斯、厂高变重瓦斯保护退出前,必须报生产副厂长或总工批准。

(6)发电机两套失磁保护不允许同时退出;在申请调度同意后允许机组退出一套失磁保护短时运行不超过24小时,并要求继电保护人员及时处理,超时需报调度批准。

(7)其余动作于跳闸的保护有故障需退出时,是否允许运行由生产副厂长或总工批准,并要求继电保护人员及时处理,在继续运行时必须汇报调度,同时要加强监视。

(8)保护装置因故需整套退出,必须先断开保护装置的所有出口压板,不允许以直接拉电源的方式来退出整套保护装置。

(9)发生保护动作、开关跳闸时,应通知持有工作票的工作班组停止工作,查明原因,以便及时处理;如发现保护误动或信号不正常,应及时通知继电保护人员进行检查。

(10)发现保护装置有起火、冒烟、巨大声响等紧急情况,值班人员先做应急处理,并同时向值长、调度汇报,联系继电保护人员,通知消防部门。

(11)当系统或设备发生故障时,值班人员应立即查明动作的保护、开关、信号和光字牌,汇报值长,做好记录,并经继电保护人员复核无误后复归信号。

(12)及时记录保护动作时的有关数据,打印有关参数事故录波和SOE记录,便于事后分析。

(13)保护装置动作后,机组仍在运行时,若经继电保护人员检查,保护系误动,在未查明误动的具体原因或未消除引起误动的缺陷前,需经过相应的保护退出审批手续,方可暂时将保护退出运行。

单项选择题
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Questions


·Read the following passage and choose the best word for each space.
Do you want to send an e-mail message to the White House
Good luck.
In the past, (26) President Bush — or at least those assigned to read his mail — what was (27) your mind it was necessary only to sit down at a personal computer connected to the lnternet and (28) a note to president@ whitehouse.gov.
But this week, Tom Matzzie, an online organizer with the A.F.L.-C.I.O., discovered that (29) with the White House had become a bit more (30) . When Mr. Matzzie sent an e-mail protesting (31) a Bush administration policy, the message was bounced back With an automated reply, saying he had to send it again in a new way.
Under a system (32) on the White House Website (33) the first time last week, those who want to send a message to President Bush must now (34) as many as nine Web pages and (35) a detailed form that starts by asking whether the message sender supports White House policy (36) differs with it.
The white House says the new e-mail system is an effort to be more responsive (37) the public and offer the administration "real time" access (38) citizen comments.
Completing a message to the president also requires (39) a subject from the provided list, then entering a full name, organization, address and e-mail address. (40) the message is sent, the writer must wait for an automated response (41) his message, (42) whether the addressee intended to send the message. The message is delivered to the White House only after the person using that e-mail address (43) it.
"Over (44) , it’s a very cumbersome process," said Jakob Nielsen, an authority on Web design. "It’s probably designed deliberately to (45) on their e-mail.\

A. on B. in C. at D. of