| The main contents of this thesis research for the electromagnetism influence of the field upon the ecosystem; The electric field strength and ions flow the density,Lead the line surface field is strong and marks to call a strong, synthesize a strong flow the calculation analysis and the engineering construction of the density recommendation control limit value with ion; Give or get an electric shock the calculation of the dizzy causable radio interference, the audibility voice analysis, the theories studies to constuct to recommend the control limit value with engineering。The research lets up the measure and the project of the electromagnetism environment influence。Yunnan goes to the±800 kV direct current of Guangdong to lose electrician's distance is the Chinese southern charged barbed wire net limited liability company"15" wests electricity east to send one of the engineering point items, Is the±800 kV direct current that the first business of whole world carries the camp to lose to give or get an electric shock the engineering。This engineering circuit rises to change to flow the station in Chu's male of ChuXiong of Yunnan, Fall to order to locate Guangdong to increase the city HuiDong to change to flow the station Pearl Rever Delta and easternly, The circuit is whole to grow the 1417 kms。This thesis according to actual circumstance of that engineering, Combine to lead the line to choose the type and cross to cross over, insulate to match with etc. to grind the research result of the item particularly, Draw lessons from the abroad especially the high pressure circuit of electromagnetism environment affect the construction of the standard and local high pressure direct current circuit to circulate the experience, Pass to compute the 500 kVs of±especially the high pressure direct current power line road leads the line surface field to is strong and mark to call a strong, synthesize a strong flow the density and have no with ion,Radio interference, audibility voice, Combine and measure the value to carry on the contrast actually, Select the 800 kVs of±especially the high pressure direct current power line on the road says the parameter of calculation method carry on the calculation, Carry on the science analysis also, From the design recommendation limit value that China puts forward the above electromagnetism environment parameter after give or get an electric shock the section hospital start experiment the verification, Recommendation our country the first classes of±800 kV especially the high pressure circuit electromagnetism environment influence the control limit value, Resolve the classes of±800 kV especially the high pressure circuit electromagnetism environment influence problem has no the problem that the related standard provides to limit the value。Pass the theories analysis, compute the comparison, and with existing diagraph result of comparison, Choose to use the CISPR formula analysis radio interference, Choose to use the BPA formula analysis audibility voice, Choose to use the foundation that the American EPRI goes forward to go a great deal of emulation to experiment in the direct current power line road model up put forward of method analysis synthesize the electric field and ions to flow the density。For the 800 kVs of±especially high pressure direct current circuit, Lead the line flows the 4 kAs, Leading the line is the 13 m～24 m for hour highly, The biggest magnestim in ground respond the strength not over 60uT。The far small limit rule among nations is worth the limit that 40 mTs and our country will soon draw up to be worth the 10 mTs, Near to mutually with the magnetic field of the Earth oneself, Therefore did not need to consider the circumferential magnetic field of the direct current power line road while analyze an effect of the direct current power line road。The limit of this thesis recommendation electromagnetism environment influence be worth as follows:The electric field limit be worth:A) for generally and not residents' region( if cross over the farmland), The static electricity field is strong to limit at 15 kV/m, Synthesize a strong limit in the rainy day 36 kV/ m, A clear sky 30 kVs/ m, The ion flows the density to limit in the rainy day 150 nAs/ m~2, A clear sky 100 nAs/ m~2。B) for residents' area, The static electricity field is strong to limit in the 12 kVs/ m,Synthesize a strong limit in the rainy day 30 kVs/ m, A clear sky is biggest not over 25 kVs/ m, Its 80% measured value is not over the 15 kVs/ m, The ion flows the density to limit in the rainy day 100 nAs/ m~2, A clear sky 80 nAs/ m~2。Radio interference:A strong standard of radio interference of the±800 kV direct current circuit takes to be apart from the cathode to lead the line to cast shadow the hour of the outside 20 m a clear sky to the ground 0.5MHz A strong 80%/80% value( in 80% time, Have 80% places the value that the letter degree does not exceed); Radio interference(0.5MHz)The elevation revise the quantity to take 1000 ms as the basis, Increase the 330 ms each time, The radio interference increases the 1 dB, So at suggest through expert judge of environmental protection and is big to the elevation height in the 2000 ms, Can with 61 dBuV/ m conduct and actions controls the index sign。The audibility noise limits the value limit value:A standard of the audibility noise of the±800 kV direct current circuit takes to be apart from the direct current to build on stilts the power line road cathode of the general region to lead the line to cast shadow the hour of the outside 20 m a clear sky to the ground from give or get an electric shock the noisea 50% of dizzy output audibility value, Not over 50 dB(A),Intensive rea through population with L50= the 45 dBA school check; Design a correction to this engineering at the same time: Take 1000 ms as the basis, Increase the noise an increment of the 1000 m circuit audibility each time about 3 dB。... |
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