本文關(guān)鍵詞：配電變壓器低壓側(cè)無(wú)線式電流變送器的設(shè)計(jì)　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 電流變送器 有效值 低功耗 無(wú)線傳輸 取能電源

【摘要】：長(zhǎng)期以來(lái)，竊電現(xiàn)象一直屢禁不止，竊電行為呈現(xiàn)出多樣化、智能化、產(chǎn)業(yè)化等特點(diǎn)，這不僅給電力企業(yè)造成了嚴(yán)重的經(jīng)濟(jì)損失也擾亂了正常的供電秩序。當(dāng)前，電力企業(yè)在反竊電過(guò)程中碰到的普遍難題是取證難、反竊電水平低，如何提升反竊電技術(shù)水平是擺在科研人員和稽查人員面前的重要課題。研制出一種智能反竊電稽查裝置對(duì)于電力企業(yè)的反竊電工作具有重要的現(xiàn)實(shí)意義。 本文研究的無(wú)線式電流變送器，是低壓智能反竊電裝置的重要組成部分，能將配電變壓器低壓側(cè)三相輸電線上電流信號(hào)采集并無(wú)線傳輸至稽查主機(jī)，與用戶電能表電流參數(shù)進(jìn)行比對(duì)，防止在配電變壓器與計(jì)量電表間發(fā)生電流法竊電，從而填補(bǔ)了當(dāng)前不存在反電流法竊電裝置的漏洞。 針對(duì)無(wú)線式電流變送器的功能部分進(jìn)行方案設(shè)計(jì)，分析了方案中各個(gè)組成部分的原理及工作流程，根據(jù)設(shè)計(jì)要求對(duì)電流變送器進(jìn)行軟硬件實(shí)現(xiàn)，選擇可插拔式的高精度Rogowski線圈作為測(cè)量探頭，從而便于帶電安裝，并結(jié)合三相電表計(jì)量芯片ADE7878實(shí)現(xiàn)電流有效值計(jì)算，采用數(shù)字積分器和失調(diào)校準(zhǔn)消除了時(shí)漂與溫漂的影響，并設(shè)計(jì)低功耗控制模塊實(shí)現(xiàn)系統(tǒng)低功耗。 另外，設(shè)計(jì)了無(wú)線式電流變送器供能方案，分析了供能電源的基本要求，在對(duì)比了幾種取能方式后選擇了更加合理的取能線圈和電池供電相結(jié)合的供電方式。經(jīng)磁場(chǎng)及磁路分析可知，開(kāi)氣隙可以有效解決磁飽和等難題。設(shè)計(jì)了后續(xù)處理電路，包括瞬態(tài)保護(hù)及過(guò)壓監(jiān)測(cè)電路、整流濾波電路、DC-DC電路、電源管理電路和可充電電池，保證取能電源可以長(zhǎng)期穩(wěn)定地供能，，并確保了取能電源能夠適應(yīng)輸電線較寬的電流范圍。 對(duì)無(wú)線式電流變送器進(jìn)行功能調(diào)試，結(jié)果表明電流變送器達(dá)到了低功耗、無(wú)線傳輸距離100m、測(cè)量精度小于3%的設(shè)計(jì)要求；另外，通過(guò)模擬取能線圈的輸出電壓，驗(yàn)證了取能電源后續(xù)處理電路能夠穩(wěn)定運(yùn)行。
[Abstract]:For a long time, the phenomenon of electricity theft has been repeatedly prohibited, the behavior of electricity theft has shown the characteristics of diversification, intelligence, industrialization and so on. This not only causes serious economic losses to electric power enterprises, but also disturbs the normal order of power supply. At present, the common problem encountered by electric power enterprises in the process of anti-theft of electricity is the difficulty of obtaining evidence and the low level of anti-theft of electricity. How to improve the technical level of anti-electricity theft is an important task for the researchers and inspectors. It is of great practical significance to develop an intelligent anti-electricity stealing inspection device for the power enterprises. The wireless current transmitter studied in this paper is an important part of the low-voltage intelligent anti-theft device. It can collect the current signal from the three-phase transmission line on the low-voltage side of the distribution transformer and transmit it wireless to the checking host. Compared with the current parameters of the user's watt-hour meter, the current stealing between the distribution transformer and the metering meter is prevented, thus filling up the loophole of the current anti-current stealing device. According to the function part of the wireless current transmitter, this paper designs the scheme, analyzes the principle and work flow of each component of the scheme, and implements the hardware and software of the current transmitter according to the design requirements. The high precision Rogowski coil of pluggable type is chosen as the measuring probe, which is convenient for live installation, and realizes the calculation of the current RMS value with the three-phase meter metering chip ADE7878. Digital integrator and offset calibration are used to eliminate the influence of time drift and temperature drift, and a low power control module is designed to realize the low power consumption of the system. In addition, the energy supply scheme of wireless current transmitter is designed, and the basic requirements of power supply are analyzed. After comparing several energy extraction methods, a more reasonable power supply method is selected, which is combined with the battery power supply, and the magnetic field and magnetic circuit analysis show that the power supply method is more reasonable. The open air gap can effectively solve the problem of magnetic saturation. The following processing circuits are designed including transient protection and overvoltage monitoring circuit rectifier filter circuit DC-DC circuit power management circuit and rechargeable battery. It ensures that the power supply can supply energy steadily for a long time, and it can adapt to the wide current range of transmission line. The function of the wireless current transmitter is debugged. The results show that the current transmitter achieves the design requirements of low power consumption, wireless transmission distance of 100m and measurement accuracy of less than 3%. In addition, by simulating the output voltage of the energy extraction coil, it is verified that the subsequent processing circuit of the energy recovery power supply can run stably.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM421

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