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20xx年電力系統(tǒng)繼電保護(hù)基本原理(優(yōu)秀5篇)(存儲(chǔ)版)

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【正文】 35v﹤150v,因此勵(lì)磁電流小于3a,若按3a計(jì)算,變比誤差為3/45=﹤10%所以其變比誤差小于10%電力系統(tǒng)繼電保護(hù)基本原理篇五思考題 功率方向判別元件實(shí)質(zhì)上是在判別什么,為什么會(huì)存在“死區(qū)”?什么時(shí)候要求它動(dòng)作最靈敏?,并評(píng)述其優(yōu)缺點(diǎn):(l)相間短路的三段式電流保護(hù)。三、名詞解釋載波通道載波通道是利用電力線路,結(jié)合加工設(shè)備、收發(fā)信機(jī)構(gòu)成的一種有線通信通道。a、電纜b、阻波器c、耦合電容器d、保護(hù)間隙二、填空題根據(jù)阻抗繼電器的比較原理,阻抗繼電器可以分為幅值比較式和。如重合不成功,仍跳開三相而不再進(jìn)行重合,不能跳開三相并進(jìn)行三相重合 ,為防止線路長(zhǎng)期出現(xiàn)非全相運(yùn)行,應(yīng)將其他兩相自動(dòng)斷開得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..15.(2分)對(duì)一次設(shè)備的運(yùn)行狀態(tài)進(jìn)行監(jiān)視、測(cè)量、控制和保護(hù)的設(shè)備稱為()得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..16.(2分)自適應(yīng)繼電保護(hù)描述有誤的是()。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..8.(2分)正常運(yùn)行的電力系統(tǒng)是三相對(duì)稱的,其零序、負(fù)序電流和電壓理論上為()。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..2.(2分)流入差動(dòng)繼電器的不平衡電流與變壓器外部故障時(shí)的穿越電流有關(guān),穿越電流越大,不平衡電流()。.得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..4.(3分)反時(shí)限電流保護(hù)廣泛用于前端饋線中。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 a,b,d,..6.(3分)電網(wǎng)的電流保護(hù)主要采用()三段式電流保護(hù)。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..18.(2分)關(guān)于三相電路自動(dòng)重合閘的說法有誤的是()。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..11.(2分)下列不屬于電容器外部故障保護(hù)的是()。,故稱為階段式電流保護(hù)。.得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 、單選題1.(2分)流入差動(dòng)繼電器的不平衡電流與變壓器外部故障時(shí)的穿越電流有關(guān),穿越電流越大,不平衡電流()。.得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..4.(3分)電容器外部一般也裝有熔斷器,電容器內(nèi)部元件嚴(yán)重?fù)p壞時(shí),外部熔斷器將電容器切除。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 a,b,..6.(3分)電流保護(hù)主要反映的相間短路故障包括()。,發(fā)生斷路器失靈故障的原因很多,主要有斷路器跳閘線圈斷線、斷路器操作機(jī)構(gòu)出現(xiàn)故障、空氣斷路器的氣壓降低或液壓式斷路器的液壓降低、直流電源消失或操作回路故障等、直流電源消失及操作回路出現(xiàn)問題。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..12.(2分)電力系統(tǒng)中的電量信號(hào)都是在時(shí)間和數(shù)值上連續(xù)變化的信號(hào),因此,都屬于__1__。,依次切除不重要的負(fù)載,若系統(tǒng)頻率長(zhǎng)時(shí)間停留在較低水平上,則特殊級(jí)的頻率測(cè)量元件啟動(dòng)得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..7.(2分)單相重合閘的缺點(diǎn)不包括()。.得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..9.(3分)利用線路保護(hù)切除故障是切除母線故障的一種方式。.得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..2.(3分)動(dòng)作電流的整定包括躲開變壓器空載投入的勵(lì)磁涌流。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 a,b,c,..6.(3分)電力系統(tǒng)在不同運(yùn)行條件(例如)下系統(tǒng)與設(shè)備的工作狀況稱為電力系統(tǒng)運(yùn)行狀態(tài)。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 a,b,d,..2.(3分)下列關(guān)于單cpu微機(jī)保護(hù)裝置說法正確的有()。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..16.(2分)微機(jī)保護(hù)算法中全周波傅氏算法的特點(diǎn)描述有誤的是()。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..7.(2分)電力系統(tǒng)是電能生產(chǎn)、變換、()、分配和使用的各種電力設(shè)備按照一定的技術(shù)與經(jīng)濟(jì)要求有機(jī)組成的一個(gè)聯(lián)合系統(tǒng)。.得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..10.(3分)母線故障對(duì)電力系統(tǒng)穩(wěn)定將造成嚴(yán)重威脅,必須以極快的速度切除。.得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..2.(3分)核能發(fā)電需要注意防泄漏,核廢料污染。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 a,c,..8.(3分)電磁型過電流繼電器的參數(shù)包括()。(模擬量輸入系統(tǒng))(cpu主系統(tǒng))得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 a,b,d,e,..2.(3分)下列關(guān)于單cpu微機(jī)保護(hù)裝置說法正確的有()。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..16.(2分)微機(jī)保護(hù)算法中全周波傅氏算法的特點(diǎn)描述有誤的是()。得分:0 知識(shí)點(diǎn):電力系統(tǒng)繼電保護(hù)作業(yè)題 ..11.(2分)大容量發(fā)電機(jī)中,由于額定電流很大,其每相都是由兩個(gè)或多個(gè)并聯(lián)的繞組組成,在正常運(yùn)行的時(shí)候,各繞組中的電動(dòng)勢(shì)相等,流過相等的負(fù)荷電流。,使保護(hù)各主要功能分別由單個(gè)cpu獨(dú)立完成,軟件方面通過各軟件功能相互閉鎖制約,提高保護(hù)的可靠性。同步奠基,母線,變壓器,其他電氣設(shè)備和輸電線路保護(hù)中通常使用下列幾種繼電器。⑴任何設(shè)計(jì)完善能夠正常運(yùn)行的系統(tǒng)都或多或少的存在少許的問題,因此這就要求保護(hù)繼電器 動(dòng)作的靈敏性要高。1960 年至 1980 年,計(jì)算機(jī)被用于繼電 器保護(hù)中,它能很好的參與并在實(shí)踐中得到很好的利用。保護(hù)繼電器是一個(gè)感知元件,它感知故障、確定故障的位置,并且通過閉合相 應(yīng)斷路器的跳閘線圈來發(fā)出跳閘命令。higher torque for a given power input an more uniform r, with the advent of electronic tubes, electronic relays having distinct features were developed during the discovery of solid state ponents during 1950s, static relays with numerous advantages were use of digital puters for protective relaying purposes has been engaging the attention of research and practicing engineers since layer 1960s and , the microprocessor/mini puterbased relaying scheme, because of its numerous advantages such as self –checking feature and flexibility, has been widely used in power system all over the overall system protection is spanided into following sections:(i)generator protection,(ii)transformer protection,(iii)bus protection,(iv)feeder protection,(v)transmission line requirements to protective relays any protection scheme, which ed to safeguard the power system ponents against abnormal conditions such as faults, consists basically of two elements(i)protective relay and(ii)circuit protective relay which is primarily the brain behind the whole scheme plays a very important ore proper care should be taken in selecting an appropriate protective relay which is reliable, efficient and fast in protective relay must satisfy the following requirements: ⑴ since faults on a well designed and healthy system are normally rare, the relays are called upon to operate only means that the relaying scheme is normally idle and must operate whenever fault other words, it must be reliable.⑵ since the reliability partly depends upon the maintenance, the relay must be easily maintainable.⑶ the palpation of the relay can be in two is the failure to operate in case a fault occurs an second is the relay operation when there is no a matter of fact, relay must operate if there is a fault and must not operate if there is no fault.⑷ relaying scheme must be sensitive enough to distinguish between normal and the faulty tive relays the function of the protective relay is to sense the fault and energize the trip coil of the circuit following types of the protective relays are used for the apparatus such as synchronous machines, bus bar, transformer and the other apparatus and transmission line protection.(1)over current relays,(2)under voltage relays,(3)under frequency relays,(4)directional relays,(5)thermal relays,(6)phase sequence relays such as(i)negative sequence relays and,(ii)zero sequence relays,(7)differential relays and percentage differential relays,(8)distance relays such as(i)plane impedance relays,(ii)angle impedance relay, or reactance relays,(iii)angle admittance relays, relays and ,(iv)offset and restricted relays,(9)pilot relays such as(i)wire pilot relays,(ii)carrier channel pilot relays,(iii)microwave pilot are different types of the relaying scheme based on are:(i)electromechanical type,(ii)thermal relays,(iii)transduction relays,(iv)rectifier bridge relay,(v)electronic relays,(vi)digital relaying 電力系統(tǒng)的穩(wěn)態(tài)運(yùn)行經(jīng)常會(huì)因各種電力設(shè)備配故障原因而被擾亂。在遠(yuǎn)處實(shí)現(xiàn)對(duì)相鄰元件的行時(shí),在300mw機(jī)組上,宜裝設(shè)失步保護(hù);當(dāng)汽化時(shí),間接影響零序分量大??;②零序電流超前于零后備保護(hù), 稱為遠(yuǎn)后備保護(hù)。動(dòng)作特性包括。方向相答:能反應(yīng)電力系統(tǒng)中電氣元件發(fā)生故障或者不正帶時(shí)限動(dòng)作于信號(hào),必要時(shí)動(dòng)作于切機(jī)(3)對(duì)于 反的零序電壓。相接地(4)轉(zhuǎn)子繞組一點(diǎn)接地或兩點(diǎn)接地(5)轉(zhuǎn)子缺點(diǎn):需要有按相操作的斷路器。高、動(dòng)作時(shí)限短2零序電流保護(hù)相比相間短路的電重合閘前加速保護(hù)一般稱為“前加速”。相信許多人會(huì)覺得范文很難寫?接下來小編就給大家介紹一下優(yōu)秀的范文該怎么寫,我們一起來看一看吧。不足:對(duì)于運(yùn)行方式變化很大或接地點(diǎn)變化很大的電網(wǎng),不能滿足系統(tǒng)運(yùn)行的要求單相重合閘過程中,系統(tǒng)又發(fā)生震蕩,可能出現(xiàn)較大零序電流的情況,影響零序電流保護(hù)的正確工作當(dāng)采用自偶變壓器聯(lián)系兩個(gè)不同電壓等級(jí)的電網(wǎng),任一側(cè)發(fā)生接地短路都將在另一側(cè)產(chǎn)生零序電流,使得零序電流保護(hù)整定計(jì)算復(fù)雜化射線路中,重合閘裝置僅裝
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