电力系统故障分析与保护原理笔试题.pdfVIP

一道题是：两票是：工作票和操作票

33、系统发生两相接地短路故障时，复合序网的连接方式为（A）

A.正序、负序、零序并联B.正序、负序并联、零序网开路C.

正序、零序并联、负序开路D.零序、负序并联，正序开路

44：变电站母线电压是y轴，电流是第二象限，则线路向变电站：输

送/吸收有功，输送/吸收感性无功

15．利用避雷器保护变压器时，一定要使避雷器的伏秒特性曲线（A）

变压器伏秒特性曲线。

(A)低于(B)高于(C)等于(D)高于或等于

30．沿脏污表面的闪络不仅取决于是否能产生局部电弧，还要看流过

脏污表面的电流是否足以维持一定程度的（B），以保证局部电

弧能继续燃烧和扩展。

(A)碰撞游离(B)热游离(C)光游离(D)滑闪放电

1.由于在变压器过激磁时，变压器励磁电流将激增，保护用差电流

中（C）次谐波的含量作为对过激磁的判断。

（A）．2；（B）.3；（C）.5；

Onequestionis:thetwovotesare:workticketa

ndoperationticket

33.Whenatwo-phasegroundingshortcircuitfaultoccursinthesystem,theconnection

methodofthecompositesequencenetworkis(A)

A.Positivesequence,neivesequence,zerosequenceparallelconnectionB.Positive

sequence,neivesequenceparallelconnection,zerosequencenetworkopencircuitC.

Positivesequence,zerosequenceparallelconnection,neivesequenceopencircuitD.

Zerosequence,neivesequenceparallelconnection,positivesequenceopencircuit

44:Thesubstationbusvoltageisthey-axis,andthecurrentisthesecondquadrant,t

henthelinetransmits/absorbsactivepowertothesubstation,andtransmits/absorbs

inductivereactivepower.

15.Whenusingalightningarrestertoprotectatransformer,thevolt-second

characteristiccurve(A)ofthelightningarrestermustbethevolt-secondcharacteristic

curveofthetransformer.

(A)lowerthan(B)higherthan(C)equalto(D)higherthanorequalto

30.Theflashoveralongthedirtysurfacenotonlydependsonwhetheralocalarccan

begenerated,butalsowhethertheleakagecurrentflowingthroughthedirtysurfaceis

sufficienttomaintainacertaindegreeof(B)toensurethatthelocalarccancontinueto

burnandexpand.

(A)Collisiondissociation(B)Thermaldissociation(C)Photodissociation(D)Slipflash

discharge

1.Sincetheexcitationcurrentofthet