【正文】 壓母線接地故障電流越來(lái)越大，在接地設(shè)計(jì)中要滿足電力行業(yè)標(biāo)準(zhǔn)DL/T 6211997《交流電氣裝置的接地》≤2000/I是非常困難的。 現(xiàn)行標(biāo)準(zhǔn)對(duì)接地電阻值規(guī)定要放寬到5Ω，但是放寬是有附加條件的，這就是需要滿足接地標(biāo)準(zhǔn)的相關(guān)規(guī)定，根據(jù)工程的具體條件，在不超過(guò)5Ω的某一個(gè)范圍內(nèi)都是合格的。這就為我們接地設(shè)計(jì)和施工增加了靈活性，不必在變電所的接地工程中花費(fèi)巨額投資。所以，現(xiàn)行標(biāo)準(zhǔn)并沒(méi)有降低對(duì)接地網(wǎng)整體性的要求，而是對(duì)接地網(wǎng)的安全性要求更高更全面了，這就是接地設(shè)計(jì)必須遵循的原則和運(yùn)行對(duì)接地網(wǎng)的考核要求。 簡(jiǎn)單接地設(shè)計(jì)接地設(shè)計(jì)一般可分為方格地網(wǎng)、不等間距地網(wǎng)或者通過(guò)降低接地電阻措施來(lái)達(dá)到接地目的，作為本設(shè)計(jì)中35kv供電系統(tǒng)，可做簡(jiǎn)單的接地設(shè)計(jì)，一般采用方格網(wǎng)接地。方格地網(wǎng)方格地網(wǎng)的設(shè)計(jì)簡(jiǎn)單，但因?yàn)榻拥鼐W(wǎng)邊緣部分的導(dǎo)體散流大約是中心部分的34倍，因此，方格地網(wǎng)邊緣部分的電場(chǎng)強(qiáng)度比中心部分高，電位梯度較大，整個(gè)地網(wǎng)的電位分布不均勻，接地鋼材用量多，經(jīng)濟(jì)性差。在220 kV及以下的變電工程中，缺點(diǎn)不太突出。在500 kV變電所采用方格網(wǎng)，上述缺點(diǎn)的表現(xiàn)十分明顯，建議500 kV變電所的接地網(wǎng)不采用方格地網(wǎng)。致 謝本次課程設(shè)計(jì)是在我的指導(dǎo)老師王慶芬老師的親切關(guān)懷和悉心指導(dǎo)下完成的。她嚴(yán)肅的科學(xué)態(tài)度，嚴(yán)謹(jǐn)?shù)闹螌W(xué)精神，精益求精的工作作風(fēng)，深深地感染和激勵(lì)著我。從課題的選擇到項(xiàng)目的最終完成，王老師始終給予我細(xì)心的指導(dǎo)和不懈的支持。在此，謹(jǐn)向王老師致以誠(chéng)摯的謝意和崇高的敬意。在此，我還要感謝在一起愉快的度過(guò)大學(xué)生活的電氣07103班的各位同學(xué)，正是由于你們的幫助和支持，我才能克服一個(gè)一個(gè)的困難和疑惑，直至本文的順利完成。在論文即將完成之際，我的心情無(wú)法平靜，從開(kāi)始進(jìn)入課題到論文的順利完成，有多少可敬的師長(zhǎng)、同學(xué)、朋友給了我無(wú)言的幫助，在這里請(qǐng)接受我誠(chéng)摯的謝意!最后我還要感謝培養(yǎng)我長(zhǎng)大含辛茹苦的父母，謝謝你們!參考文獻(xiàn)[1] 黃純?nèi)A,[M]，天津大學(xué)出版社，2001[2] 王崇林、[M]. 煤炭工業(yè)出版社, 1996[3] [M]. 中國(guó)電力出版社, 2005[4] 姚春球主編. 發(fā)電廠電氣部分[R]. 中國(guó)電力出版社, 2003[5] 崔景岳等編著. 煤礦供電[M]. 煤礦工業(yè)出版社, 1988[6] 孫國(guó)凱等編著. 電力系統(tǒng)繼電保護(hù)原理[M] 中國(guó)水利水電出版社 2002[7] 李景恩等編著 . 礦井供電[C] 煤炭工業(yè)出版社， 1996[8]電力工程電氣設(shè)計(jì)手冊(cè)[S]. 水利水電出版社, 1987[9]于健明等主編. 供電技術(shù)[M]，機(jī)械工業(yè)出版社2008[10]熊信銀等主編. 電氣工程基礎(chǔ)[M]，華中科技大學(xué)出版社2005[11]趙學(xué)泉等主編. 電源電路[M]，電子工業(yè)出版社 1995[12] Glover,Power System Analysis and Design[M],China Machine [13] Zhu Bangshen China Safety Science Journal[M] , China Science Press .2004附 錄附錄A：外文資料A historical review of the rural substationSubstation construction of rural agricultural production with drought, drainage need electricity birth, because of the short cycle power applications, low efficiency, rural power grid construction has not been sufficient attention at all levels. Consider the reliability of power supply less funds invested little, a group of highpressure urban network discarded electrical equipment, back into the rural substation use, so the contradictions behind the original rural network equipment is more prominent. Side of the main transformer substation, such as conventional multioil circuit breaker circuit breakers, 10kV using voltage switchgear, substations city network is a model for copying. While plete sets of equipment and good technical performance and reliability has been greatly improved, but because the equipment technical parameters of the high repair and maintenance work load is heavy, easy to leak oil, a safe and civilized production has brought some difficulties. Users within the mining layout, leading to the high cost, large area, long construction period, and the rural economy is not developed and produced a national land resource constraints conflict, from the facts of China39。s rural areas, increasing the burden on farmers. Conventional substation covers an area of ??more large investment and long construction period, the lack of rural power features, therefore, according to the specific characteristics of rural power, rural substation construction and development to explore the direction and pattern, is the pressing problem. At present, China39。s highvoltage electrical appliances, especially highvoltage switching equipment, technology has been greatly improved, a fundamental solution to rural substation automation and reliability problems. So we must be bined with the actual situation of rural power, the use of new technology, new equipment, to phase out old equipment.2 small rural programs of Substation At present, the rural power grid and power infrastructure, including the CPC Central Committee attaches great importance to the rural power grid construction and transformation in the country has already started. According to ministerial small rural power substation design procedures, Rural Design Guidelines for Unattended Substation, countylevel scheduling and munications automation norms and other procedures, the design of the proposed new rural substation requirements: (1) rural substation building program is necessary to meet the needs of agricultural modernization, but also for the actual situation of the rural power grid. (2) new substations should adopt new technology, new equipment, bined with the actual rural network, and be technologically advanced and reliable security, not a long maintenance cycle, maintenance work is small. (3) the overall layout of the substations in rural areas, pay attention to saving investment, maintenance work is small. According to the above spirit, we should follow the smallcapacity, point clouds, short radius and outdoor type, small size, low cost, safe, reliable, advanced technology principle, proposed Rural Power Substation program. The first program Main transformer highvoltage SF6 circuit breaker with side, low side of the SF6 circuit breaker using column。 10kV SF6 circuit breaker outlet using column。 control and protection using integrated set of puter controlled devices. Primary Equipment 10kV SF6 use this program as the outlet side of the protection switch, you can replace the indoor type GG1A High Voltage Switchgear, out of outdoortype DW35type multioil circuit breaker. High voltage circuit breaker oilfree, safe and civilized for my Office first class production of double standards and power supply enterprises laid the foundation. At the same time, so that the technically advanced, SF6 circuit breaker after the current scientific research efforts, the quality of equipment has been resolved, have been put into mass production. The SF6 circuit breakers for 35kV, the Bureau has been put into operation in the Western Hills substation, reliable, and run well. The SF6 circuit breakers 10kV Bureau of Panji39。s folder in my groove substation, collector of the Tang Dynasty, Fengtai summer collection substation were put into operation, the overall situation is safe. SF6 circuit breaker from the operation of the province of view, manufacturing quality is mature. Voltage quality to meet the requirements,