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摘要:發(fā)電機(jī)的正常運(yùn)行對(duì)保證發(fā)電站和輸電系統(tǒng)的正常工作起著舉足輕重的作用，然而發(fā)電機(jī)又是非常昂貴的東西，因此，應(yīng)該針對(duì)發(fā)電機(jī)的各種異常工作狀態(tài)和各種故障類型，裝設(shè)穩(wěn)定可靠的發(fā)電機(jī)保護(hù)裝置。 發(fā)電機(jī)的故障運(yùn)行狀態(tài)有定子繞組匝與匝之間的短路、相與相間短路、只有一相之間的接地、轉(zhuǎn)子勵(lì)磁電路的勵(lì)磁電流為零、轉(zhuǎn)子繞組一點(diǎn)接地或兩點(diǎn)接地 發(fā)電的異常運(yùn)行狀態(tài)主要有：功率超過(guò)了發(fā)電機(jī)的容量造成的三相繞組對(duì)稱超負(fù)荷；由于外部短路而引起的定子繞組過(guò)電流；由外部不對(duì)稱短路或由于突然甩負(fù)荷而引起的定子繞組過(guò)電壓；還有勵(lì)磁電路發(fā)生故障或勵(lì)磁時(shí)間過(guò)長(zhǎng)造成的轉(zhuǎn)子繞組超負(fù)荷； 在發(fā)電站中水輪機(jī)是非常重要的設(shè)備,也是相當(dāng)昂貴的動(dòng)力設(shè)備,為了讓水輪發(fā)電機(jī)組安全可靠穩(wěn)定的運(yùn)轉(zhuǎn)，確保發(fā)電的質(zhì)量和輸電運(yùn)行正常工作,根據(jù)發(fā)電機(jī)組在電網(wǎng)系統(tǒng)中所起的不同作用和按照它的容量的大小,需要對(duì)發(fā)電機(jī)組配置相適應(yīng)的保護(hù)裝置。本文就水輪機(jī)的定子繞組匝間短路和定子繞組相間短路保護(hù)為切入點(diǎn),講述了發(fā)電機(jī)定子繞組短路保護(hù)的配置原則與方法,配置原則是必須確保配置的裝置便宜實(shí)用、安全可靠穩(wěn)定且故障時(shí)水輪發(fā)電機(jī)組遭受損害最小。 倮姑電站用的是重慶新世紀(jì)電氣公司生產(chǎn)的EDCS系列電力系統(tǒng)綜合自動(dòng)化裝置。我的畢業(yè)設(shè)計(jì)探討了倮姑小型發(fā)電機(jī)定子繞組短路保護(hù)的經(jīng)驗(yàn)案例，總結(jié)了倮姑電廠1#機(jī)組運(yùn)行十年來(lái)的保護(hù)裝置的運(yùn)行經(jīng)驗(yàn)，設(shè)計(jì)了倮姑電廠發(fā)電機(jī)定子繞組短路保護(hù)裝置的配置原則與方法。 關(guān)鍵詞：倮姑電廠；發(fā)電機(jī)保護(hù)；差動(dòng)保護(hù)；整定計(jì)算
ABSTRACT:To ensure the normal work of electric power system and power quality the Safe operation of generator plays a decisive role. at the same time, generator itself is very expensive electrical equipment. therefore, should be based on different kinds of fault and abnormal working state, installation of relay protection device performance improvement. Power is fault operation of the state are: the stator winding phase short circuit , stator phase winding interturn short ,the stator winding single-phase grounding,rotor one point grounding or two-point grounding ,the rotor excitation circuit of excitation current disappeared. Power is not the normal operation of the state are:because the stator winding of external short circuit current,because the three-phase symmetrical load exceeds the rated capacity generator caused by overload,generator negative sequence current caused by external asymmetrical short-circuit or unbalanced load current, the stator winding overvoltage caused by due to the sudden load rejection,The rotor winding caused by overload Because the excitation circuit fault or strong excitation time,generator reverse power caused by Because the steam turbine suddenly shut down etc. Hydraulic turbine is the most important power equipment in power plants,electrical components are the most precious.In order to ensure that the turbine safety, stable, efficient operation of power system and ensure the normal work and the quality of electric energy.according to the different roles of the different capacity of hydroelectric generating set and played in the power system, it needs to protect configuration of hydroelectric generating set corresponding different.In this paper, starting from the electrical protection mechanical protection and generator turbine aspects,talking about the configuration and characteristics of hydraulic turbine protection.But no matter how configuration,Must ensure the protection of economic reasonable, reliable action and fault of hydrogenerator unit suffered minimal damage. Luo Kou power plant is the use of integrated automation EDCS series device in electric power system of Chongqing new century electrical company,this paper studies the development of domestic small generator microcomputer protection current and new achievements,from the operation experience of microcomputer protection device adopts since Luo Gu 1# power plant put into operation,the overall technical scheme of Luo Kou power plant generator microcomputer protection device is proposed. Keywords:Luo Kou power plant; generator protection ；differential protection ；Setting calculation |
