本文選題：同塔雙回 + 耐雷性能�。� 參考：《長沙理工大學(xué)》2014年碩士論文

【摘要】：電力生產(chǎn)是國民經(jīng)濟(jì)發(fā)展的關(guān)鍵,隨著電網(wǎng)建設(shè)規(guī)模與傳輸容量的增大,而可用架空輸電線路走廊日趨緊張,超高壓主干網(wǎng)架將朝同塔雙、多回并架方向發(fā)展。日本,美國等國超高壓電網(wǎng)中多采用同塔雙回輸電,我國三峽電站及江浙等地也建設(shè)了多條500kV超高壓同塔雙回輸電線路。由于500kV同塔雙回線路桿塔增高,引雷面積增大而使雷電跳閘率升高,且存在雷電引起絕緣子雙回同時(shí)閃絡(luò)跳閘的情況,嚴(yán)重影響電力系統(tǒng)的穩(wěn)定運(yùn)行,因此對(duì)500kV同塔雙回線路進(jìn)行耐雷性能分析具有一定的工程實(shí)踐意義。論文以500kV同塔雙回輸電線路為研究對(duì)象,基于ATP-EMTP對(duì)500kV同塔雙回輸電線路反擊耐雷性能進(jìn)行仿真計(jì)算時(shí),考慮更接近現(xiàn)場(chǎng)實(shí)際的多波阻抗桿塔模型,利用在頻域中用有理函數(shù)近似處理A(ω)和Zc的J.Marti線路模型,同時(shí)用非線性電感模型替代單值電感進(jìn)行先導(dǎo)閃絡(luò)模型的仿真研究,考慮了前驅(qū)電流的同時(shí)避開了參數(shù)的預(yù)計(jì)算,利用統(tǒng)計(jì)法,考慮工頻電壓的影響,計(jì)算500kV同塔雙回輸電線路反擊耐雷水平。研究了電氣幾何模型、分析計(jì)算了500kV同塔雙回輸電線路繞擊跳閘率及各類因素對(duì)跳閘率的影響,提出了符合現(xiàn)場(chǎng)實(shí)踐的防雷改造措施。研究結(jié)果表明,桿塔高度、沖擊接地電阻、工頻電壓、導(dǎo)線排列方式、避雷線根數(shù)、閃絡(luò)模型等影響因子對(duì)線路的反擊耐雷性能影響十分明顯。隨著沖擊接地電阻的減低,桿塔高度的降低,輸電線路單回和雙回跳閘率都顯劇降低；工頻電壓對(duì)500kV線路反擊耐雷水平有很大的影響,應(yīng)予以考慮。500kV同塔雙回線路導(dǎo)線排列方式對(duì)其耐雷水平有影響,導(dǎo)線排列應(yīng)盡量采用逆相序排列方式,以降低線路跳閘率；3根地線可使總反擊跳閘率降至2根地線的89%,雙回跳閘率和單回跳閘率均有所降低；用非線性電感建立絕緣閃絡(luò)模型,提高了500kV同塔雙回輸電線路耐雷水平仿真計(jì)算精度。隨著擊距系數(shù)、風(fēng)擺角、地面傾角、避雷線保護(hù)角的增大,500kV同塔雙回輸電線路跳閘率明顯增加,工頻電壓對(duì)500kV同塔雙回輸電線路耐雷性能影響明顯,在分析500kV線路繞擊耐雷性能時(shí),也應(yīng)充分考慮工頻電壓的影響。針對(duì)典型桿塔計(jì)算分析：在雷電過電壓作用下,風(fēng)速達(dá)到26.8米/秒時(shí),就可能導(dǎo)致線路跳閘,此計(jì)算值可供工程參考。
[Abstract]:Power production is the key to the development of national economy. With the increase of power grid construction scale and transmission capacity, the available overhead transmission line corridor is becoming increasingly tight, and the UHV backbone network frame will develop in the direction of the same tower and double tower and multi-circuit parallel frame. In Japan, the United States and other countries, the same tower and double circuit transmission lines are often used in the UHV power grid. Many 500kV UHV double-circuit transmission lines have also been built in China's three Gorges Power Station and Jiangsu and Zhejiang provinces. The lightning tripping rate is increased due to the increase of the tower of the double circuit line of the same tower of 500kV and the increase of the lightning induced area, and there exists the situation that the insulator flashover tripping simultaneously caused by the lightning, which seriously affects the stable operation of the power system. Therefore, it is of engineering significance to analyze the lightning resistance performance of 500kV dual circuit with tower. In this paper, 500kV double-circuit transmission line with same tower is taken as the research object. When simulating the anti-lightning performance of 500kV double-circuit transmission line based on ATP-EMTP, the model of multi-wave impedance bar and tower which is closer to the actual field is considered. The J.Marti circuit model of A (蠅) and ZC is approximated by rational function in the frequency domain, and the simulation of the pilot flashover model is carried out by using the nonlinear inductance model instead of the single value inductor. The precursor current is taken into account and the pre-calculation of the parameters is avoided. By using statistical method and considering the influence of power frequency voltage, the lightning resistance level of 500kV double-circuit transmission line with the same tower is calculated. This paper studies the electrical geometry model, analyzes and calculates the tripping rate of 500kV double-circuit transmission line and the influence of various factors on the tripping rate, and puts forward the measures of lightning protection in line with the field practice. The results show that the influence factors, such as tower height, impulse grounding resistance, power frequency voltage, conductor arrangement, lightning arrester root number and flashover model, have a significant effect on the anti-lightning performance of the line. With the decrease of impulse grounding resistance and tower height, both single-circuit and double-circuit tripping rates of transmission lines are significantly reduced, and the power frequency voltage has a great influence on the lightning resistance level of 500kV lines. Consideration should be given to the influence of the conductor arrangement mode on the lightning resistance level of .500kV double-circuit transmission line with the same tower, and the reverse phase sequence arrangement should be adopted as far as possible in the conductor arrangement. In order to reduce the line tripping rate and 3 ground wires, the total return tripping rate can be reduced to 89 of 2 ground wires, the double tripping rate and the single tripping rate will be decreased, and the insulation flashover model can be established by nonlinear inductance. The simulation accuracy of lightning resistance level of 500kV double circuit transmission line with same tower is improved. With the increase of strike distance coefficient, wind swing angle, ground inclination angle and lightning protection angle, the tripping rate of 500kV double-circuit transmission line with the same tower increases obviously, and the power frequency voltage has an obvious effect on the lightning resistance performance of 500kV double-circuit transmission line with the same tower. The influence of power frequency voltage should also be taken into account when analyzing the lightning resistance performance of 500kV lines. According to the calculation and analysis of typical pole and tower: when the wind speed reaches 26.8 m / s under the action of lightning overvoltage, it may lead to line tripping, which can be used as a reference for engineering.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM863

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 魏旭,李長益;500kV同桿架設(shè)線路感應(yīng)電流的計(jì)算[J];華東電力;2000年03期

，

本文編號(hào)：1888896