【文章內(nèi)容簡(jiǎn)介】 t endering agent 39。s ser vice f ees. Tender ing agent 39。s service f ee payment in accor dance wit h t he Gener al Of f ice of t he St ate development and Ref or m Comm ission on t ender ing agent39。s ser vice char ge of not if ication on t he r elevant issues ( t he change pric e [ 2021]857). Sale of pr equalif icat ion documents and solicit at ion documents going t o choose all, pr icing should be based on t he pr inciple of pr of it not f iles, m ust not violat e t he r elevant provisions in t he pr ice Depar tm ent . 4. 7 r equir em ent s in t he f orm of application pr oxy applicat ion shall be pr epar ed in t he 5t h chapt er of t he f or mat . Applicat ion of var ious suppor ting document s hould be r equested by t he select ion of f iles gr ouped by or der. Compar ison and select ion of t he bidding agencies m ust pr ovide support ing documents r equir ed by t he f ile。 t he f ile you select ed does not have t he r equir ed suppor ting document s, bidding agency acknowledged t he need t o pr ovide, or you can pr ovide. Proxy application shall be bound, and page by page coded in t he or der. 5th chapt er applicat ion f orm at not es: bidding agent . .2 摘 要 電動(dòng)機(jī)因具有結(jié)構(gòu)簡(jiǎn)單、價(jià)格低廉、使用維護(hù)方便等優(yōu)點(diǎn)，在國(guó)民經(jīng)濟(jì)各方面被廣泛采用。然而，由于供電狀態(tài)和機(jī)械負(fù)荷的多變性，使得電動(dòng)機(jī)的故障率較高，不僅會(huì)損壞電動(dòng)機(jī)本身，而且會(huì)影響整個(gè)生產(chǎn)，造成較大的經(jīng)濟(jì)損 失。因此，電動(dòng)機(jī)的安全運(yùn)行對(duì)保證廠礦企業(yè)的正常生產(chǎn)是非常重要 的。 本文首先分析了異步電動(dòng)機(jī)的常見故障，以 交流采樣的方法進(jìn)行數(shù)據(jù)采集為 依據(jù)，采用 檢測(cè)三相電壓 、 三相 電流、零序電流的方法，得出了電動(dòng)機(jī)故障的準(zhǔn)確判據(jù)，確定了各種故障的保護(hù)措施，對(duì)電動(dòng)機(jī)實(shí)現(xiàn)了短路、 欠壓 、 斷相 、 漏電 、 過(guò)載 等 保護(hù)功能。 本文以 8 位單片機(jī) AT89C52 做微處理器， AT89C52 單片機(jī)內(nèi)置 256 字的 RAM 和 8K字的 ROM，可以進(jìn)行外部擴(kuò)展數(shù)據(jù)存儲(chǔ)器和程序存儲(chǔ)器，具有性能較好的 I/O、運(yùn)算等功能，有合適的指令系統(tǒng)，能夠?qū)崿F(xiàn)電機(jī)智能保護(hù)，電路簡(jiǎn)單，功能齊全。為了實(shí)現(xiàn)電機(jī)分布檢測(cè)和控制的要求，控制系統(tǒng)具有便于集中管理和信息共享的特點(diǎn)。 關(guān)鍵詞 ： 電動(dòng)機(jī) ； 智能保護(hù) ； 單片機(jī) AT89C52； 故障保護(hù) Abstract II Abstract Because the electric motor has the structure simply, the price inexpensive, merits and so on use maintenance convenience, is widely used in the national economy various , as a result of the power supply condition and the machinery load polytropy, causes electric motor the failure rate to be high, not only can damage electric motor itself, moreover can affect the entire production, creates the big economic , the electric motor safe operation to guaranteed the factory and mining enterprise the regular production is extremely important. This article has first analyzed the asynchronous motor mon breakdown, take exchanges the sampling method to carry on the data acquisition as the basis, uses the examination threephase voltage, the threephase current, the zero foreword electric current method, has obtained the electric motor breakdown accurate criterion, had determined each kind of breakdown protective measures, realized the short circuit to the electric motor, have owed press, break, protection functions and so on the leakage, overload. This article makes the microprocessor by 8 monolithic integrated circuit AT89C52, in at89C52 monolithic integrated circuit sets at 256 character RAM and 8K character ROM, may carry on exterior expansion datacarrier storage and the program memory, has functions and so on performance good I/O, operation, has the appropriate mand system, can realize the electrical machinery intelligence protection, the electric circuit is simple, the function is plete. In order to realize the request which the electrical machinery distribution examines and controls, the control system has is advantageous for the centralized management and the information sharing characteristic. Keywords: Electric motor。 intelligent protection。 monolithic integrated circuit AT89C52。 fail safe 目 錄 4. 1 applicat ion of t he Chinese language applicat ion f or pr oxy bidding agency application syst em . 4. 2 bidding agent applications should be subm it ted by t he Agency included in t he 5t h chapt er of t he cont ent, and t han select file asked t o pr ovide appr opr iat e docum ent ation. 4. 3 pr oxy applicat ion shall af f ix it s of ficial seal coding and page by page in t he specif ied locat ion. Agent a copy of t he applicat ion shall have t o num ber t he pages and signed or iginal copy ( copy) ( including suppor ting document s) , and copy should be exact ly t he same. 4. 4 applicat ion t here shall be no loose pages. agent application should be plet e wit h indelible ink ( powder ed) pr int s, t he agent shall not alt er any page of t he applicat ion. bidding agencies of fer should be based on t he int er im measures for t he management of t ender ing agent39。s ser vice char ges ( met er pr ices [ 2021] 1980) r ules of t he Ni h, t ender agent ser vice char ges using t he dif f erence pr ogressive bilng r at e. Charges in accordance wit h t he t ender ing agent 39。s ser vice char ges and, in conj unction wit h t he pr ovisions of t he specif ic cir cumstances of t he pr oject shall not be f loat ing up and down f loat ing r ange m ust not exceed 20%, other wise t he application cannot pass pliance checks, be invalidat ed. Due t o bidding agency select ion and pr incipal agent cont r act s igned dur ing charging base bid am ount has not yet been pr oduced, it can only be accor ding t o t he r at es of pr ice, bid and t he bid am ount det ermines af t er t he end, cont roled r esponse r ates calculat ed shall pay t ender f ee ( t ender agency f ee accounts f or t he act ual bidding agent it em f or f ar es) . Than t he select ed person t ender ing agent39。s ser vice char ge cont rol t he upper and lower lim it s, Cap f or t he St at e Development Planning Com m ission of t he int er im measur es for t he managem ent of t ender ing agent39。s ser vice char ges ( met er pr ices [ 2021]1980) of t endering agent 39。s ser vice f ees under 100%, t he lower lim it f or t he Stat e Developm ent Planning Com m ission of t he int er im m easur es f or t he m anagement of t ender ing agent 39。s ser vice char ges ( met er pr ices [ 2021]1980) of t ender ing agent39。s ser vice fees under 80%. Tendering agent39。s ser vice charge base should include t he f olowing t ender s: constr uction, supervision and mater ial over t he above t ender s ar e expect ed to be im por t ant , wit h each t endering agency entr ust ed wit h t ender bid am ount as a base f or a separ ate put ation of t endering agent 39。s ser vice f ees. Tender ing agent 39。s service f ee payment in accor dance wit h t he Gener al Of f ice of t he St ate development and Ref or m Comm ission on t ender ing agent39。s ser vice char ge of not if ication on t he r elevant issues ( t he change pric e [ 2021]857). Sale of pr equalif icat ion documents and solicit at ion documents going t o choose all, pr icing should be based on t he pr inciple of pr of it not f iles, m ust not violat e t he r elevant provisions in t he pr ice Depar tm ent . 4. 7 r equir em ent s in t he f orm of application pr oxy applicat ion shall be pr epar ed in t he 5t h chapt er of t he f or mat . Applicat ion of var ious suppor ting document s hould be r equested by t he select ion of f iles gr ouped by or der. Compar ison and select ion of t he bidding agencies m ust pr ovide support ing documents r equir ed by t he f ile。 t he f ile you select ed does not have t he r equir ed suppor ting document s, bidding agency acknowledged t he need t o pr ovide, or you can pr ovide. Proxy application shall be bound, and page by page coded in t he or der. 5th chapt er applicat ion f orm at not es: bidding agent . .2 目 錄 摘要 1