本文選題：高壓套管 + 絕緣缺陷��； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：高壓絕緣套管是電氣設(shè)備的重要附件(如主變套管等),用于變壓器、電抗器等電氣設(shè)備高壓引線對(duì)金屬外殼的絕緣,是電力系統(tǒng)的重要組成部分,其絕緣性能直接關(guān)系電網(wǎng)的安全、穩(wěn)定和經(jīng)濟(jì)運(yùn)行。現(xiàn)行的高壓套管絕緣缺陷監(jiān)測(cè)方法在可靠性和實(shí)用性等方面尚存在一些問(wèn)題。因此,研究更為有效的高壓套管絕緣缺陷監(jiān)測(cè)方法,具有重要的工程意義。 本文提出了一種高壓套管絕緣缺陷的監(jiān)測(cè)方法。該方法以套管的暫態(tài)電壓和電流(由系統(tǒng)正常操作或其它設(shè)設(shè)備故障引起)為信息源,由暫態(tài)電壓和電流得到套管絕緣缺陷監(jiān)測(cè)和診斷的判別函數(shù),根據(jù)判別函數(shù)的最大值診斷套管的絕緣缺陷。本文建立了套管的等效網(wǎng)絡(luò)模型,以變壓器套管為例進(jìn)行了高壓套管簡(jiǎn)化電場(chǎng)分布研究,根據(jù)軸、徑向場(chǎng)強(qiáng)的相對(duì)大小確定套管等效橫、縱向電容的比例,提出了根據(jù)套管的介損試驗(yàn)數(shù)據(jù)確定等效網(wǎng)絡(luò)參數(shù)的方法。通過(guò)仿真和試驗(yàn)對(duì)提出的監(jiān)測(cè)方法進(jìn)行了驗(yàn)證。大量的ATP仿真結(jié)果證實(shí)了該方法的有效性和可行性。本文以110kV電容式充油套管為例建立了具體的模型,設(shè)置了表示不同絕緣缺陷程度的三種工況,對(duì)套管故障診斷方法進(jìn)行了試驗(yàn)驗(yàn)證。三次試驗(yàn)的診斷結(jié)果基本正確,對(duì)套管工作狀態(tài)正常與否可以做出準(zhǔn)確診斷。實(shí)驗(yàn)室試驗(yàn)結(jié)果初步證實(shí)了該方法的有效性和可行性。 本文提出的監(jiān)測(cè)方法,只需要與相關(guān)設(shè)備共享的套管的暫態(tài)電壓和電流,即可實(shí)現(xiàn)變壓器套管絕緣缺陷位置與嚴(yán)重程度的監(jiān)測(cè)與診斷。不需要注入信號(hào)和龐大甚至復(fù)雜的附加設(shè)備,經(jīng)濟(jì)實(shí)用,具有較強(qiáng)的可操作性。
[Abstract]:High voltage insulating sleeve is an important accessory of electrical equipment (such as main transformer casing, etc., used for insulation of metal shell by high voltage lead wire of transformer, reactor, etc., and is an important part of power system. Its insulation performance is directly related to the security, stability and economic operation of the grid. There are still some problems in the reliability and practicability of the current insulation defect monitoring method for high voltage sleeving. Therefore, it is of great engineering significance to study a more effective method for monitoring insulation defects of high voltage sleeving. This paper presents a method for monitoring insulation defects of high voltage sleeving. In this method, the transient voltage and current of the casing (caused by the normal operation of the system or the failure of other equipment) are used as the information source, and the discriminant function for monitoring and diagnosing the insulation defects of the casing is obtained from the transient voltage and current. The insulation defect of casing is diagnosed according to the maximum value of discriminant function. In this paper, the equivalent network model of casing is established, and the simplified electric field distribution of high voltage bushing is studied by taking transformer bushing as an example. According to the relative magnitude of axial and radial field strength, the proportion of equivalent transverse and longitudinal capacitance of casing is determined. A method for determining the equivalent network parameters based on the test data of casing dielectric loss is presented. The proposed monitoring method is verified by simulation and experiment. A large number of ATP simulation results show that the method is effective and feasible. In this paper, taking 110kV capacitive oil-filled casing as an example, a concrete model is established, and three kinds of working conditions are set up to express different insulation defects. The fault diagnosis method of casing is tested and verified. The diagnostic results of the three tests are basically correct, and the correct diagnosis can be made on whether the casing is in normal working condition or not. The experimental results show that the method is effective and feasible. The monitoring method proposed in this paper only needs the transient voltage and current of the bushing shared with the relevant equipment to realize the monitoring and diagnosis of the location and severity of the insulation defects of the transformer bushing. There is no need for injection signal and large or even complicated additional equipment. It is economical and practical and has strong maneuverability.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM855

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本文編號(hào)：1938508