【正文】 2） 初定垂直接地體根數(shù)，確定屏蔽系數(shù)因閉合接地裝置的周長(zhǎng) L=[(2+50)+( 2+40)] 2=192m，接 地體間距 a=6～ 7m，故垂直接地體根數(shù)約為 ?????? ??? 2d llR cd ??變電站防雷接地技術(shù) 23 n=L/a=32～ 根 ， 實(shí)取 n=30 根 。 按 n=30 及 2/ ?la ，查得 ?c? 。 接地裝置的接地線（即連接扁鋼）熱穩(wěn)定性校驗(yàn) m m 3m in ???? djd tCIS （ 43） 實(shí)選接地線 40 5=200mm2Smin， 合格 。 防雷接地 ： 35KV 變電站用獨(dú)立避雷針 , 避雷針接地引下線埋在地中部分與配電裝置構(gòu)架的接地導(dǎo)體埋在地中部分在土壤中的距離大于 3m, 變電站電氣裝置的接地裝置采用水平接地極為主的人工接地網(wǎng) , 水平接地極采用扁鋼 50mm 5mm, 垂直接地極采用角鋼 50mm 5mm, 垂直接地極間距 5m～ 6m, 主接地網(wǎng)接地裝置電阻不大于4Ω , 主接地網(wǎng)埋于凍土層 1m 以下。人工接地網(wǎng)的外緣應(yīng)閉合 , 外緣各角應(yīng)做成圓弧形。 變電站防雷接地技術(shù) 24 5 結(jié)論 本論文首先對(duì)變電站防雷接地技術(shù)的基本技術(shù)問(wèn)題作了詳盡的描述：針對(duì)目前變電站設(shè)備中防雷技術(shù)的中存在的問(wèn)題，提出詳盡的防雷解決方案，還介紹了變電站接地設(shè)計(jì)的必要性和設(shè)計(jì)原則，闡述了變電站接地電阻 的測(cè)量和降阻措施，提出了變 電站電氣設(shè)備防雷措施。 在理論分析的基礎(chǔ)上 最后通過(guò) 對(duì)我國(guó)農(nóng)村 35KV變電站進(jìn)行防雷接地保護(hù)設(shè)計(jì) ； 根據(jù)變電站國(guó)家防雷接地標(biāo)準(zhǔn)，結(jié)合 35KV 變電站電氣接線圖以及具體情況，學(xué)習(xí)利用各種防雷接地裝置等，實(shí)現(xiàn)對(duì)變電站的直擊雷防護(hù)、雷電侵入波防護(hù)以及變電站的接地保護(hù)設(shè)計(jì)，具有一定針對(duì)性和廣泛性。 由于時(shí)間和自己知識(shí)及能力的限制，導(dǎo)致此次課題設(shè)計(jì)存在錯(cuò)誤之處，懇請(qǐng)各位老師批評(píng)指正。 針對(duì)我國(guó)農(nóng)村 35KV 變電站進(jìn)行防雷接地保護(hù)設(shè)計(jì)變電站防雷接地技術(shù) 25 參考文獻(xiàn) [1] 變電所防雷接地施工手冊(cè) [2] 韶廣潤(rùn)．電力系統(tǒng)過(guò)電壓 [M]．北京：水 利電力出版 .1985， 76（ 57）： 4446． [3] 楊金夕 .防雷 /接地及電氣安全技術(shù) [J].機(jī)械工業(yè)出版社 . 2021， 54(36):6669. [4] 劉介才 .工廠供電 [J].機(jī)械工業(yè)出版社 .2021， 93(46):8689. [5] 虞吳．現(xiàn)代防雷技術(shù)基礎(chǔ) [M]．北京：清華大學(xué)出版社 .2021， 55（ 79） :4547． [6] 李?lèi)?，楊海寬．電氣安全工?[M]．化學(xué)工業(yè)出版社． 2021， 63（ 38） :3538. [7] 楊文學(xué) ， 任紅 . 電力安全技術(shù) [D]. 中國(guó)電力出版社 . 2021， 34（ 56）： 8990. [8] 李景祿 ， 胡毅 劉春生 .實(shí)用電力接地技術(shù) [M].中國(guó)電力出版社 .2021， 55(69):5659. [9] 陳家斌 .接地技術(shù)與接地裝置 .中國(guó)電力出版社 [D].2021， 49（ 59）： 5659. [10] 白公 .怎樣閱讀電氣工程圖 [J]．機(jī)械工業(yè)出版社． 2021， 34（ 78）： 5659. [11] 文遠(yuǎn)芳 ．高電壓技術(shù) [M]．武漢：華中科技大學(xué)出版社 .， 2021， 65（ 34）： 2227． [12] 談笑君，尹春燕 .變配電所及其安全運(yùn)行 [J].機(jī)械工業(yè)出版社 .2021， 66（ 45）： 7980. [14] 方大千 .變電所及變壓器實(shí)用技術(shù) [J].人民郵電出版社 .2021， 83(64):3438. [13] GB 5005794 建筑物防雷設(shè)計(jì)規(guī)范（ 2021年局部修訂）英文翻譯版 變電站防雷接地技術(shù) 26 a 您好，為你提供優(yōu)秀的畢業(yè)論文參考資料，請(qǐng)您刪除以下內(nèi)容， O(∩_∩)O 謝謝?。?！A national survey was recently launched to evaluate the eye health of Chinese children andteenager June 6, China39。s annual National Day for Eye Care, the China Youth Development ServiceCenter and Zhejiang Medicine, a leading listed Chinese pharmaceutical pany, jointlyannounced the kickoff of the about one month, a questionnaire piled by top eye care medical experts in China willbe distributed through multiple online partners, including , as well asthrough offline survey events held in universities, middle schools and primary schools acrossthe report will be released based on the survey statistics and analysis, and most importantly,guidelines for parents and youth on how to care for the eyes and prevent myopia — agrowing problem in China39。s digitized society, will also be attached on the report.Myopia is not only a disease that makes people see things blurrily, but also leads to severeplications, such as glaua (increased pressure within the eyeball), and can causeblindness, said Zhou Yuehua, an established eye care specialist with Beijing TongrenHospital.It is very important for parents and children to know about the risk and care for their eyes.There are about 450 million myopia patients in China. Among Chinese myopia patients,30million are severe patients, according to ZhouThe prevalence of myopia among high school and college students is more than 70 percent,and the situation is continuously worsening, he Zhu, director with the China Youth Development Service Center, said long hours ofstudy, lack of exercise, especially outdoor activities, and attachment to electronic screen aresome of the top reasons behind the widespread myopia problems, and the increase ofyounger patients, although China has made great progress in improving the hardwarefacilities and lighting conditions in s said he hopes the survey will alert people on the threatening situation, and also helpmedical experts to better guideline parents and children39。s behaviors to care for eyes, basedon the timely and factual statistics the survey series of followup events will also be held in six cities, including Jinan in Shandongprovince, and Changsha in Hunan province, to educate people on how to care for eyes afterthe survey started. More and more Chinese are jogging to get and stay fit. Most joggers will run alone, but some will jog with friends or even coaches. The Beijing Olympic Forest Park is one of the most popular spots. It is packed with runners in the afternoon, usually after work, and at weekends. Jogging after a whole day39。s work can be a way to unwind. It is true for He Wenjun, whose workplace is right near the forest park. She discovered her athletic aptitude at the age of seven, when she began playing tennis. Then she turned to jogging, and she has persevered with it for 10 years. I e to jog almost every day after work, whenever I have time. I think jogging is good for my health. And for me, a girl, it helps me to achieve to eternal goal, to keep slim, He said. He says she prefers jogging alone, so she can focus better. She loves jogging, even during Beijing39。s smoggy days. If the smog is severe, I39。ll hold off jogging for a while. But if I really want to get away from work, I39。ll wear a mask, or just ignore the smog and go on jogging, she said. For those who are not so athletic, jogging also has its attractions. Wu Houbin started roughly two years ago, when he was severely obese. Within two months, his weight dropped from 82 kilograms to 64 kilograms. The success helped him recover health, and he has made friends. Jogging does not require speed, but stamina. If you want to stick to the game, you need to take it as a mission, a habit, and then eventually a hobby, Wu said. But persevering with jogging is not always easy. Jogging is beneficial for heartlung function, and the skeletal system, but doctors say improper technique damages the joints, especially the knees and ankles. Excessive jogging wears down the body, and harms one39。s health. Poor technique harms the muscles and skeleton, and can cause secondary injures. And, jogging in a bad environment can cause circulation problems, said Lu Zhiyong, attending doctor, Sports Hospital, General Admin. of . Lu has some tips for joggers, and those who are thinking of taking it says people sh ould first evaluate their physical condition, to decide the amount and type of exercise, and jogging in the open air is better running on a treadmill. Conrad Macao will run special programs for the entire month of October this year to support the Hong Kong Cancer Fund39。s Pink Revolution, an annual campaign that seeks to raise awareness and funds for breast cancer research, the hotel recently announced. A major sponsor of the campaign for three years in a row, Conrad Macao has pledged to donate a portion of its proceeds to the fund, includ ing those collected from selling its popular bear and rubber duck merchandise, in limited pink editions. Pink is the theme for floral arrangements and decorations in the hotel in October. In addition, on Fridays that month, members