Electrical engineering and its autom≠ €★ation have involved many fields
2019-05-27 18:47
The theoretical basis of electrical engineerin >g and its automation is often the law of electro<αmagnetic induction, Kirchhoff's ci©→rcuit law, etc., and is related to a series of te×→α↔chnical and scientific issues, sucλ><♦h as the generation, trans♦π≤£portation and use of electric energy. We↔≥εlcome to read the graduation thesis of automa& ®tion. Many reconstruction activities of build$★εδings are included in th₽✔≥e electrical engineering, which greatly↕≥φ affects the structural performance of buildings.σ At present, in terms o•f equipment operation and line connect♣× ion, there are many problems existingα÷ in the structure of building e♠βlectrical engineering, ≠∑which have a great impact on the↑σ< quality of building &☆✔•electrical engineering re♦↑↔"novation.
Therefore, electrical engineering automaσ↓φtion design is of great s←∏ignificance in building&€↕↕ structure. This paper mainly analyzes and d±∑∏iscusses the design and implementation of buildiγ>ng electrical engineering automatio₩×n. Electrical engineering and its autom'↕✘'ation involve many fields, such as po♦Ω<₹wer electronics technology, comp♦•Ωuter technology, electrical ™↑γ∑and electrical technology information and net>©work control technology, etc. Therefor↓↑e, electrical engineerin÷'g and its automation integrate many aspects andπ← is a complex industry, with the maiβ∑∑n characteristics ofγ✔↔ combining strong and weak ↓§current, electromech≤φanical, software and hardware, etc.
All-empty power electronic swit ₩ ®ch: to some extent, electronic ÷↕ power devices have experienced four &♦ generations, the first gen≥¥eration is thyristor, and still in use tod₩≥≤ay; The second generation<₽σ is a fully controlled dε•δevice, which emerged after the AC fr¥✘equency conversion techn↑≠λ₽ology; The third generφ>≤ation is composite power electronic d≤™↑evices, namely IGBT Ωβ♠★and MGT; Power integrated circuit (PIC) is the£™ε fourth generation of power ele≠φ☆ctronic devices. From the orig≤©¶inal low frequency circuit to the curr₽←ent high frequency circuit: the repla★ ε>cement of converter circuit is driven bβδy the development of power electronic ♠σ®devices;
However, when DC converte∑↔↓r is used in common t→∞hyristor, it mainly controls the whole train γ$mutually, while the frequency ★★converter mode used in A©§ΩC variable frequency drive is AC to DC an≥₩®d then to AC. When the second genera"™tion power electronic devices replace the ori± ginal converter, they are used m∑γore. During the development of PMW converter, ♦Ωmany defects are gradually revealed. →☆Therefore, high-frequ♥♣ •ency circuit gradually replacφ§£↓es the original low-fπrequency circuit.
General frequency conver↔∑λter put into use: before ΩΩthe general frequency co♦ε•≥nverter was put into use, it a•↑lso experienced the first generation of functio≈∑nal U/F control type, ©Ωthe second generation of high functional U/F type"∞↓' and high dynamic performance frequency ≥ ₽•converter. Condition÷φ-based maintenance of electrical equipme£✔nt refers to the detection and maintenance of★αΩ electrical equipment when iσ↑t is in a certain state. For the condition main¥↕¥tenance technology of elλ∏ectrical equipment, online de'₩&®tection system is very important. Accord↑φ↑↔ing to the data displayed by the online monitoΩ ♦×ring system, technicians can find the abnormα₹εal problems in time and implement the fault ma←↓intenance plan as soon↓☆¥ as possible. The maiΩ±n contents are as follows:
The insulation performance has a great impa✔↑ct on the safe operation of the po♣>wer system. During the construction of t≠¥αhe power grid in China, the i✘♠§nsulation monitoring syst₩÷em is designed by using insulators tha♦☆t are operated on the grid, such as gl"₽₽≥ass, composite insulators, etc. These devices a$φre easily affected by external factors, thα us weakening their performance. In o∏& rder to ensure the st ★able operation of electrical equipment™€, the insulation components can b↓∞✘e equipped with a monitoring ←"system.
In the process of transmissi" on, if there is a problem in the line, it wil<Ω÷l have a great impac↕α t on the normal suppl¶™σy of electric energy. Therefo↕✔÷®re, in the condition-based maintenance sch✔₹≥eme, the lightning monitoring system should be r×δ÷easonably planned. For ex±® ample, if the lightning rod is installed, theΩ♣Ω electrical equipment can be monitored γ±before and after the lightning stroke, and it c≤♥an also be protected. Electrical equi∏©pment or connecting lin¶∏©≠es are easily affected by the enviro≈nment. The environmental monitoring s÷αβystem mainly monitors tσ×→he atmospheric temperatu¶∑≤♠re, sulfur dioxide, etc. If these fact♣≠¶ ors are not conducive to the performa$₽<nce of electrical equipment, there will ♠$γ←be abnormal signals disp₹♥ ≤layed on the monitoring system aελ♥nd communicated to the monitoring center, so tha≥∏t technicians can tak✔σe corresponding measures in¥¥εφ time to implement maintenance.'φ
Sensor technology, after the&Ω maintenance personnel i£ ∞>nstall the sensor on the electr→↔"ical equipment, they can receive the relevant ↑↑"status signals of the equipment froσπ₹m time to time, which is conducive to φ accurately judge the abnormalγ↕ fault. In addition, it can effectiv≤γ★•ely expand the monitoring range of βγ♣electrical equipment, accurately capture signal•€s, and effectively improve the ₩×operation level of building electrical engi÷ ≠∞neering automation. communications technology♦ ×. During the condition maintenance oper♠™ation, the speed of abαβ÷normal signal transmission of electrε'φ×ical equipment to the control cen≈σα₹ter should be accelerated so t✘→≈$hat the maintenance personn¥♥→el can work out the treatment plan $λas soon as possible. For e &xample, the digital transmission can use GMS or♠✘✘ CDMA system. In this si£<©tuation, the control personnel can understand ¶≤the actual status of $"electrical engineering in time, whi'±¥ch is conducive to realε-time monitoring.
The sensor with good quality can accurately caπεpture the signal, and after the maintenance pe♠♦×rsonnel process the sig ×☆nal, the electrical equipment ind &≠¶uction signal with practical applica♠≈§tion significance should be screened out, wh→★ich is conducive to the maintenance of₹Ω&λ later failures and ensure the¶★₹" smooth progress of t™ 'he work. Generally, the powerful data pσ≥rocessing ability of computers is w'€idely used here, which can effectivelδ∑↑y integrate and process data re≤®Ωsources.
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