發(fā)布時(shí)間：2018-11-27 07:13

【摘要】：干式空心并聯(lián)電抗器在電網(wǎng)中可以起到補(bǔ)償無功功率,限制工頻過電壓等作用。隨著電網(wǎng)電壓等級的提升,干式空心并聯(lián)電抗器的容量越來越大,并聯(lián)支路數(shù)也隨之增加,在制造過程中可能存在匝數(shù)上的偏差,運(yùn)行或運(yùn)輸過程中也可能出現(xiàn)匝間短路或斷股故障。現(xiàn)有的方法對上述缺陷診斷非常困難,針對這一類問題,本文提出通過測量分布電流的方法判斷電抗器缺陷,并對測量裝置進(jìn)行了研制。本文通過建立干式空心并聯(lián)電抗器電路模型,對電氣參數(shù)特性進(jìn)行分析,給出了正常電抗器與故障電抗器支路電流的計(jì)算方法,并以一臺型號為BKDK-20000/35干式空心并聯(lián)電抗器為例進(jìn)行計(jì)算。通過解析和仿真的方法計(jì)算了電抗器自身運(yùn)行產(chǎn)生的磁場,針對現(xiàn)場運(yùn)行電抗器對被測電抗器的工頻干擾進(jìn)行分析。為避免工頻干擾,通過設(shè)計(jì)的25Hz電源對電抗器進(jìn)行測量,將采集卡采集的數(shù)據(jù)利用諧波分析,準(zhǔn)同步采樣算法進(jìn)行數(shù)據(jù)處理。針對磁場的干擾對傳感器設(shè)計(jì)了磁屏蔽。最后對干式空心電抗器樣品進(jìn)行試驗(yàn)驗(yàn)證。研究結(jié)果表明:當(dāng)干式空心電抗器發(fā)生匝間短路、斷股故障和匝數(shù)偏差時(shí),電抗器總電流變化很小,故障位置處支路電流變化量很大。在25Hz功率電源下通過磁屏蔽電流傳感器對電抗器支路電流進(jìn)行測量,利用準(zhǔn)同步采樣及諧波分析法對采集到的數(shù)據(jù)進(jìn)行處理,得到的測量結(jié)果與理論值一致,驗(yàn)證了采用25Hz試驗(yàn)電源和準(zhǔn)同步諧波分析法抗工頻干擾能力強(qiáng),準(zhǔn)確度高,能夠準(zhǔn)確得出分布電流測量結(jié)果。
[Abstract]:Dry hollow shunt reactor can compensate reactive power and limit power frequency overvoltage in power grid. With the increase of power grid voltage grade, the capacity of dry hollow shunt reactor becomes larger and larger, and the number of parallel branches also increases, which may lead to the deviation of the number of turns in the manufacturing process. There may also be inter-turn short-circuit or broken strands during operation or transportation. The existing methods are very difficult to diagnose the defects mentioned above. In view of this kind of problems, the method of measuring distributed current is put forward to judge the defect of reactor, and the measuring device is developed. In this paper, the circuit model of dry hollow shunt reactor is established, the characteristics of electrical parameters are analyzed, and the calculation method of branch current of normal reactor and fault reactor is given. A model of BKDK-20000/35 dry hollow parallel reactor is taken as an example. The magnetic field generated by the reactor itself is calculated by analytical and simulation methods, and the power frequency interference of the reactor is analyzed according to the field operation reactor. In order to avoid power frequency interference, the reactor is measured by the designed 25Hz power supply, and the data collected by the acquisition card is analyzed by harmonic analysis, and the quasi-synchronous sampling algorithm is used to process the data. A magnetic shield is designed for the sensor due to the interference of the magnetic field. Finally, the dry hollow reactor samples were tested and verified. The results show that the total current of the reactor changes little and the branch current changes greatly when the inter-turn short circuit occurs in the dry hollow reactor, the fault of broken strands and the deviation of the number of turns. The current of reactor branch is measured by magnetic shielding current sensor under 25Hz power supply. The collected data are processed by quasi-synchronous sampling and harmonic analysis. The measured results are in agreement with the theoretical values. It is verified that the 25Hz test power supply and the quasi-synchronous harmonic analysis method have strong ability of resisting power frequency interference and high accuracy, and can accurately obtain the results of distributed current measurement.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM472

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本文編號：2359816