供配电系统
摘：电力系统基功户输送电lOkV配电网连接供电电源工业商业生活电枢纽网络庞复杂户期低价格买具高度性电然济性性两素互相矛盾提高供电网络性必须增加网络建设投资成果提高性户停电损失降低提高性增加投资种建设投资没价值通计算电网投资户停电损失终找衡点投资损失综合济性优
关键词：供配电供电性功补偿负荷分配
1 引言
电力体制改革引发新轮规模电力建设热潮极推动电力技术革命新技术新设备开发应日新月异特信息技术电力技术结合程度提高电质量电力供应性技术发展降低电力建设成进推动电网设备更新换代文契机国外配电动化中前问题容配电动化建设背景前电力系统热点技术进行较深入探讨研究完成工作
(1)提出配电动化建设两典型模式―体化模式分立化模式侧重分析分立模式配电动化系统体系结构出软硬件配置站选择理模式佳通讯方式等文研究前提实现台
(2)针配电动化中障测量定位隔离供电恢复关键问题分析线路障中电压电流等电量变化导出相间短路工况障定位数学描述方程出方程解障情况重参数s U& s I& e I& 选择表通障动诊断分析出优化隔离恢复供电方案动实现障快速隔离网络重构减少户停电范围时间效提高配网供电性文中出障分段判断网络快速重构软件流程方法
(3)状态估计实现配电动化中关键技术文阐述状态估计方法基础出良测量数识结构性错误识方法针状态估计中数基残差坏数检测异常状态量中坏数状态估计影响存问题提出状态估计中拓扑错误种实化检测辩识方法针窃电漏计电费问题独创性提出种通电量突变异常分析防止窃电新方法潍坊城区配电验证
(4)针配电网负荷预测建模困难参数离散度相关素等问题文分析常规负荷预测模型方法基础引入气象素日期类型社会环境影响等参数出基神网络电力负荷预测方法实例验证方法正确性
(5)针源滤波抑制谐波功补偿方面足补偿度连续性文提出种PWM 电路拓朴结构基功功率理源滤波方案建立基Saber Designer 仿真台仿真分析证明方案行性时结合配电动化技术配电网动态功优化补偿降低线损方法进行设计分析通实例计算验证客观济效益
(6)针中国电力市场未发展趋势政府监电力市场公交易设计种适合国电力市场现状电价分组电量协调分组竞价短期电力交易模式出基边际电价机组组合算法制订交易计划数学模型安全济约束等竞争例逐步提高情况够较解决原中长期合电价短期竞争电价矛盾减少电厂公收益差异时电力市场全网负荷曲线电厂进行限量优化减少总系统购电费
2 配电网分析 Distribution network analysis
配电网电力系统中重环节配电网接方式安全运行直接关系电力系统安全稳定接方式选择国国情然环境设备制造运行水等关例雷电活动情况绝缘结构设计周边干扰等素会影响中性点接方式选择反中性点接方式电力系统设计运行调试发展影响般电压等级较高系统中绝缘费设备总价格中占相重降低绝缘水带济效益显著通常采中性点直接接方式采动重合闸保证供电性相反电压等级较低系统中通常采中性点接方式提高供电性综合考虑供电性安全素电压素继电保护选择投资费等方面素情况证正确选择配电网接方式重性断开发利新型接装置应配电网接系统中配电网接方式重课题
文工作lOkV配电网接方式进行研究较选择分述类接方式优缺点国外较常中性点接方式中性点消弧线圈接方式(称谐振接方式)中性点电阻接方式中性点直接接方式通技术较确定优接方式利种年研究开发应谐振接方式中动踪补偿装置配灵敏电流接选线保护够效限制电网障接电弧更利电网安全运行文首先配电网类接方式做深入研究全面介绍国外种常中性点接方式运行特性通技术济较接方式进行综合评价结合接方式发展前景出结优化谐振接方式表现出发展潜力
然文lOkV配电网中性点谐振接方式运行特性进行研究介绍限制障接电弧危害出发重点述利电流谐振原理效熄灭障接电弧等接着文结合国外科技发展创新成果谐振接优化方式中微机接保护性动踪补偿装置进行全面分析述说明谐振接优化方式供电性身安全设备安全通信干扰等方面具较运行特性解决电流接系统接保护选择性实现动调谐种接方式成配电网较理想中性点接方式文时谐振接方式实施技术进行研究包括消弧线圈参数选择安装调整运行维护等容
文总结课题研究容谐振接籍助微机技术支持年国外均进行优化优化谐振接技术提高供电性保护身安全设备安全电磁环境等项合理重技术手段谐振接实施技术更充分发挥谐振接方式功谐振接方式具更技术济指标著电网断发展丰富实践结果表明谐振接方式代表电流接方式优接方式配电网中性点接方式发展总趋势配电网接方式中应推广应
文提出思路方案结仅lOkV配电网中性点接方式选择研究实际工程应具实际参考作电压等级中性点接方式选择样具鉴作
电力系统基功户输送电lOkV配电网连接供电电源工业商业生活电枢纽网络庞复杂户期低价格买具高度性电然济性性两素互相矛盾提高供电网络性必须增加网络建设投资成果提高性户停电损失降低提高性增加投资种建设投资没价值通计算电网投资户停电损失终找衡点投资损失综合济性优文针配电网种接线模式特点种接线模式济性性进行分析
3 结
文首先介绍lOkV配电网种典型接线模式国外国家典型接线模式然确定配电网接线模式分析思路明确进行分析必性重性提出优分段数计算必性阐述优分段数济性性影响然建立优分段数计算模型简单介绍种接线模式供电方案配电网种接线模式性济性进行计算分析通计算描绘种图表优分段数作分析讨文章种接线模式济性性进行总结分析种接线模式优点缺点适情况结合实际情况针lOkV配电网规划建设提出益建议lOkV配电网规划设计建成网架坚实布局合理理科学够安全优质高效运行配电网提供理益指引
参考文献
［1］苏文成工厂供电[M]机械工业出版社19999
［2］刘介工厂供电设计指导[M]机械工业出版社199912
［3］供配电系统设计规范[S]中国计划出版社1996
［4］低压配电设计规范[S]中国计划出版社19966
Power Supply and Distribution System
ABSTRACT The basic function of the electric power system is to transport the electric power towards customers The l0kV electric distribution net is a key point that connects the power supply with the electricity using on the industry business and dailylife For the electric power allcostumers expect to pay the lowest price for the highest reliability but don＇t consider that it＇s selfcontradictory in the coexistence of economy and reliableTo improve the reliability of the power supply network we must increase the investment cost of the network construction But if the cost that improve the reliability of the network construction but the investment on this kind of construction would be worthless if the reducing loss is on the poweroff is less than the increasing investment on improving the reliability Thus we find out a balance point to make the most economicbetween the investment and the loss by calculating the investment on power net and the loss brought from poweroff
KEYWORDS power supply and distribution power distribution reliabilityreactive compensation load distribution
The revolution of electric power system has brought a new big round constructionwhich is pushing the greater revolution of electric power technique along with the application of new technique and advanced equipment Especially the combination of the information technique and electric power technique to great ex tent has improved reliability on electric quality and electric supply The technical development decreases the cost on electric construction and drives innovation of electric network On the basis of national and internatio nal advanced electric knowledge the dissertation introduces the research hotspot for present electric power sy etem as following
Firstly This dissertation introduces the building condition of distribution automation(DA) and brings forward two typical construction modes on DA construction integrative mode and fission mode It emphasize the DA structure under the condition of the fission mode and presents the system configuration the main station scheme the feeder scheme the optimized communication scheme etc which is for DA research reference
Secondly as for the (DA) trouble measurement position isolation and resume This dissertation analyzes the changes of pressure and current for line problem gets math equation by educing phase short circuit and problem position under the condition of singlephase and works out equation and several parameter s U& s I& and e I& table on problem It brings out optimized isolation and resume plan realizes auto isolation and network reconstruction reduces the power off range and time and improves the reliability of electric power supply through problem self diagnoses and selfanalysis It also introduces software flow and use for problem judgement and sets a model on network reconstruction and computer flow
Thirdly electricity system state is estimated to be one of the key techniques in DA realization The dissertation recommends the resolvent of bad measurement data and structure mistake on the ground of describing state estimate way It also advances a practical test and judging way on topology mistake in state estimate about bad data test and abnormity in state estimate as well as the problem and effect on bad data from state measure to state estimate As for real time monitor and control problem the dissertation introduces a new way to solve them by electricity break and exceptional analysis and the way has been tested in Weifang DA
Fourthly about the difficulty for building the model of load forecasting big parameter scatter limit and something concerned the dissertation introduces some parameters eg weather factor date type and social environment effect based on analysis of routine load forecasting and means It presents the way for electricity load forecasting founded on neural network(ANN)which has been tested it’s validity by example and made to be good practical effect
Fifthly concerning the lack of concordant wave on preve nting concordant wave and nonpower compensation and noncontinuity on compensation there is a topology structure of PWM main circuit and nonpower theory on active filter the waves technique and builds flat proof on the ground of Saber Designer and proves to be practical Meanwhile it analyzes and designs the way of nonpower need of electric network tre nds and decreasing line loss combined with DA which have been tested its objective economic benefit throu gh counting example
Sixthly not only do the dissertation design a way founded on the magrginal electric price fitted to our present national electric power market with regards to future trends of electric power market in China and fair trade under the government surveillance that is group competitio n in shortterm trade under the way of grouped price and quantity harmony but also puts forward combination arithmetic math model of trading plan and safty economical restriction It can solve the original contradiction between medium and long term contract price and short term competitive price with improvement on competitive percentage and cut down the unfair income difference of electric factory at the same time it can optimize the electric limit for all electric factories and reduce the total purchase charge of electric power from burthen curve of whole electric market network
The distribution network is an important link among the power system Its neutral grounding mode and operation connects security and stability of the power system directly At the same time the problem about neutral grounding is associated with national conditions natural environment device fabrication and operation For example the activity situation of the thunder and lightning insulating structure and the peripheral interference will influence the choice of neutral grounding mode Conversely neutral grounding mode affects design operation debugs and developing Generally in the system higher in grade in the voltage the insulating expenses account for more sizable proportion at the total price of the equipment It is very remarkable to bring the economic benefits by reducing the insulating level Usually such system adopt the neutral directly grounding and adopt the autoreclosing to guarantee power supply reliability On the contrary the system which is lower in the voltage adopts neutral none grounding to raise power supply reliability So it is an important subject to make use of new type earth device to apply to the distribution network under considering the situation in such factors of various fields as power supply reliability safety factor overvoltage factor the choice of relay protection investment cost etc
The main work of this paper is to research and choice the neutral grounding mode of the l0kV distribution network The neutral grounding mode of the l0kV network mainly adopts none grounding grounding by arc suppressing coil grounding by reactance grounding and directly grounding The best grounding mode is confirmed through the technology comparison It can help the network run in safety and limit the earth electric arc by using autotracking compensate device and using the line protection with the detection of the sensitive small ground current The paper introduces and analyzes the characteristic of all kind of grounding modes about l0kV network at first With the comparison with technological and economy the conclusion is drawn that the improved arc suppressing coil grounding mode shows a very big development potential
Then this paper researches and introduces some operation characteristics of the arc suppressing coil grounding mode of the l0kV distribution network And then the paper put emphasis on how to extinguish the earth electric arc effectively by utilizing the resonance principle This paper combines the development of domestic and international technology and innovative achievement and introduces the computer earth protection and autotracking compensate device It proves that the improved arc suppressing coil grounding mode have better operation characteristics in power supply reliability personal security security of equipment and interference of communication The application of the arc suppressing coil grounding mode is also researched in this paper
Finally the paper summarizes this topic research As a result of the domination of the arc suppressing coil grounding mode it should be more popularized and applied in the distribution network in the futureThe way of thinking project and conclusions in this thesis have effect on the research to choose the neutral grounding mode not only in I0kV distribution network but also in other power system
The basic function of the electric power system is to transport the electric power towards customers The l0kV electric distribution net is a key point that connects the power supply with the electricity using on the industry business and dailylife For the electric power all costumers expect to pay the lowest price for the highest reliability but don＇t consider that it＇s selfcontradictory in the coexistence of economy and reliable To improve the reliability of the power supply network we must increase the investment cost of the network con struction But if the cost that improve the reliability of the network construction but the investment on this kind of construction would be worthless if the reducing loss is on the poweroff is less than the increasing investment on improving the reliability Thus we find out a balance point to make the most economic between the investment and the loss by calculating the investment on power net and the loss brought from poweroff The thesis analyses on the economic and the reliable of the various line modes according to the characteristics various line modes existed in the electric distribution net in foshan
First the thesis introduces as the different line modes in the l0kV electric distribution net and in some foreign countries Making it clear tow to conduct analyzing on the line mode of the electric distribution net and telling us how important and necessary that analyses are
Second it turns to the necessity of calculating the number of optimization subsection elaborating how it influences on the economy and reliability Then by building up the calculation mode of the number of optimization subsection it introduces different power supply projects on the different line modes in brief Third it carries on the calculation and analyses towards the reliability and economy of the different line modes of electric distribution net describing drafts according by the calculation Then it makes analysis and discussion on the number of optimization subsection
At last the article make conclusion on the economy and reliability of different line modes as well as its application situation Accordion to the actual circumstance the thesis puts forward the beneficial suggestion on the programming and construction of the l0kV electric distribution net in all areas in foshan Providing the basic theories and beneficial guideline for the programming design of the lOkV electric distribution net and building up a solid net reasonable layout qualified safe and efficientlyworked electric distribution net
References
[1] Wencheng Su Factories power supply [M] Machinery Industry Publishing House 19999
[2] Jiecai Liu Factories power supply design guidance [M] Machinery Industry Publishing House199912
[3] Power supply and distribution system design specifications[S]China plans Press 1996
[4] Lowvoltage distribution design specifications [S]China plans Press 19966
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摘：电力系统基功户输送电lOkV配电网连接供电电源工业商业生活电枢纽网络庞复杂户期低价格买具高度性电然济性性两素互相矛盾提高供电网络性必须增加网络建设投资成果提高性户停电损失降低提高性增加投资种建设投资没价值通计算电网投资户停电损失终找衡点投资损失综合济性优
关键词：供配电供电性功补偿负荷分配
1 引言
电力体制改革引发新轮规模电力建设热潮极推动电力技术革命新技术新设备开发应日新月异特信息技术电力技术结合程度提高电质量电力供应性技术发展降低电力建设成进推动电网设备更新换代文契机国外配电动化中前问题容配电动化建设背景前电力系统热点技术进行较深入探讨研究完成工作
(1)提出配电动化建设两典型模式―体化模式分立化模式侧重分析分立模式配电动化系统体系结构出软硬件配置站选择理模式佳通讯方式等文研究前提实现台
(2)针配电动化中障测量定位隔离供电恢复关键问题分析线路障中电压电流等电量变化导出相间短路工况障定位数学描述方程出方程解障情况重参数s U& s I& e I& 选择表通障动诊断分析出优化隔离恢复供电方案动实现障快速隔离网络重构减少户停电范围时间效提高配网供电性文中出障分段判断网络快速重构软件流程方法
(3)状态估计实现配电动化中关键技术文阐述状态估计方法基础出良测量数识结构性错误识方法针状态估计中数基残差坏数检测异常状态量中坏数状态估计影响存问题提出状态估计中拓扑错误种实化检测辩识方法针窃电漏计电费问题独创性提出种通电量突变异常分析防止窃电新方法潍坊城区配电验证
(4)针配电网负荷预测建模困难参数离散度相关素等问题文分析常规负荷预测模型方法基础引入气象素日期类型社会环境影响等参数出基神网络电力负荷预测方法实例验证方法正确性
(5)针源滤波抑制谐波功补偿方面足补偿度连续性文提出种PWM 电路拓朴结构基功功率理源滤波方案建立基Saber Designer 仿真台仿真分析证明方案行性时结合配电动化技术配电网动态功优化补偿降低线损方法进行设计分析通实例计算验证客观济效益
(6)针中国电力市场未发展趋势政府监电力市场公交易设计种适合国电力市场现状电价分组电量协调分组竞价短期电力交易模式出基边际电价机组组合算法制订交易计划数学模型安全济约束等竞争例逐步提高情况够较解决原中长期合电价短期竞争电价矛盾减少电厂公收益差异时电力市场全网负荷曲线电厂进行限量优化减少总系统购电费
2 配电网分析 Distribution network analysis
配电网电力系统中重环节配电网接方式安全运行直接关系电力系统安全稳定接方式选择国国情然环境设备制造运行水等关例雷电活动情况绝缘结构设计周边干扰等素会影响中性点接方式选择反中性点接方式电力系统设计运行调试发展影响般电压等级较高系统中绝缘费设备总价格中占相重降低绝缘水带济效益显著通常采中性点直接接方式采动重合闸保证供电性相反电压等级较低系统中通常采中性点接方式提高供电性综合考虑供电性安全素电压素继电保护选择投资费等方面素情况证正确选择配电网接方式重性断开发利新型接装置应配电网接系统中配电网接方式重课题
文工作lOkV配电网接方式进行研究较选择分述类接方式优缺点国外较常中性点接方式中性点消弧线圈接方式(称谐振接方式)中性点电阻接方式中性点直接接方式通技术较确定优接方式利种年研究开发应谐振接方式中动踪补偿装置配灵敏电流接选线保护够效限制电网障接电弧更利电网安全运行文首先配电网类接方式做深入研究全面介绍国外种常中性点接方式运行特性通技术济较接方式进行综合评价结合接方式发展前景出结优化谐振接方式表现出发展潜力
然文lOkV配电网中性点谐振接方式运行特性进行研究介绍限制障接电弧危害出发重点述利电流谐振原理效熄灭障接电弧等接着文结合国外科技发展创新成果谐振接优化方式中微机接保护性动踪补偿装置进行全面分析述说明谐振接优化方式供电性身安全设备安全通信干扰等方面具较运行特性解决电流接系统接保护选择性实现动调谐种接方式成配电网较理想中性点接方式文时谐振接方式实施技术进行研究包括消弧线圈参数选择安装调整运行维护等容
文总结课题研究容谐振接籍助微机技术支持年国外均进行优化优化谐振接技术提高供电性保护身安全设备安全电磁环境等项合理重技术手段谐振接实施技术更充分发挥谐振接方式功谐振接方式具更技术济指标著电网断发展丰富实践结果表明谐振接方式代表电流接方式优接方式配电网中性点接方式发展总趋势配电网接方式中应推广应
文提出思路方案结仅lOkV配电网中性点接方式选择研究实际工程应具实际参考作电压等级中性点接方式选择样具鉴作
电力系统基功户输送电lOkV配电网连接供电电源工业商业生活电枢纽网络庞复杂户期低价格买具高度性电然济性性两素互相矛盾提高供电网络性必须增加网络建设投资成果提高性户停电损失降低提高性增加投资种建设投资没价值通计算电网投资户停电损失终找衡点投资损失综合济性优文针配电网种接线模式特点种接线模式济性性进行分析
3 结
文首先介绍lOkV配电网种典型接线模式国外国家典型接线模式然确定配电网接线模式分析思路明确进行分析必性重性提出优分段数计算必性阐述优分段数济性性影响然建立优分段数计算模型简单介绍种接线模式供电方案配电网种接线模式性济性进行计算分析通计算描绘种图表优分段数作分析讨文章种接线模式济性性进行总结分析种接线模式优点缺点适情况结合实际情况针lOkV配电网规划建设提出益建议lOkV配电网规划设计建成网架坚实布局合理理科学够安全优质高效运行配电网提供理益指引
参考文献
［1］苏文成工厂供电[M]机械工业出版社19999
［2］刘介工厂供电设计指导[M]机械工业出版社199912
［3］供配电系统设计规范[S]中国计划出版社1996
［4］低压配电设计规范[S]中国计划出版社19966
Power Supply and Distribution System
ABSTRACT The basic function of the electric power system is to transport the electric power towards customers The l0kV electric distribution net is a key point that connects the power supply with the electricity using on the industry business and dailylife For the electric power allcostumers expect to pay the lowest price for the highest reliability but don＇t consider that it＇s selfcontradictory in the coexistence of economy and reliableTo improve the reliability of the power supply network we must increase the investment cost of the network construction But if the cost that improve the reliability of the network construction but the investment on this kind of construction would be worthless if the reducing loss is on the poweroff is less than the increasing investment on improving the reliability Thus we find out a balance point to make the most economicbetween the investment and the loss by calculating the investment on power net and the loss brought from poweroff
KEYWORDS power supply and distribution power distribution reliabilityreactive compensation load distribution
The revolution of electric power system has brought a new big round constructionwhich is pushing the greater revolution of electric power technique along with the application of new technique and advanced equipment Especially the combination of the information technique and electric power technique to great ex tent has improved reliability on electric quality and electric supply The technical development decreases the cost on electric construction and drives innovation of electric network On the basis of national and internatio nal advanced electric knowledge the dissertation introduces the research hotspot for present electric power sy etem as following
Firstly This dissertation introduces the building condition of distribution automation(DA) and brings forward two typical construction modes on DA construction integrative mode and fission mode It emphasize the DA structure under the condition of the fission mode and presents the system configuration the main station scheme the feeder scheme the optimized communication scheme etc which is for DA research reference
Secondly as for the (DA) trouble measurement position isolation and resume This dissertation analyzes the changes of pressure and current for line problem gets math equation by educing phase short circuit and problem position under the condition of singlephase and works out equation and several parameter s U& s I& and e I& table on problem It brings out optimized isolation and resume plan realizes auto isolation and network reconstruction reduces the power off range and time and improves the reliability of electric power supply through problem self diagnoses and selfanalysis It also introduces software flow and use for problem judgement and sets a model on network reconstruction and computer flow
Thirdly electricity system state is estimated to be one of the key techniques in DA realization The dissertation recommends the resolvent of bad measurement data and structure mistake on the ground of describing state estimate way It also advances a practical test and judging way on topology mistake in state estimate about bad data test and abnormity in state estimate as well as the problem and effect on bad data from state measure to state estimate As for real time monitor and control problem the dissertation introduces a new way to solve them by electricity break and exceptional analysis and the way has been tested in Weifang DA
Fourthly about the difficulty for building the model of load forecasting big parameter scatter limit and something concerned the dissertation introduces some parameters eg weather factor date type and social environment effect based on analysis of routine load forecasting and means It presents the way for electricity load forecasting founded on neural network(ANN)which has been tested it’s validity by example and made to be good practical effect
Fifthly concerning the lack of concordant wave on preve nting concordant wave and nonpower compensation and noncontinuity on compensation there is a topology structure of PWM main circuit and nonpower theory on active filter the waves technique and builds flat proof on the ground of Saber Designer and proves to be practical Meanwhile it analyzes and designs the way of nonpower need of electric network tre nds and decreasing line loss combined with DA which have been tested its objective economic benefit throu gh counting example
Sixthly not only do the dissertation design a way founded on the magrginal electric price fitted to our present national electric power market with regards to future trends of electric power market in China and fair trade under the government surveillance that is group competitio n in shortterm trade under the way of grouped price and quantity harmony but also puts forward combination arithmetic math model of trading plan and safty economical restriction It can solve the original contradiction between medium and long term contract price and short term competitive price with improvement on competitive percentage and cut down the unfair income difference of electric factory at the same time it can optimize the electric limit for all electric factories and reduce the total purchase charge of electric power from burthen curve of whole electric market network
The distribution network is an important link among the power system Its neutral grounding mode and operation connects security and stability of the power system directly At the same time the problem about neutral grounding is associated with national conditions natural environment device fabrication and operation For example the activity situation of the thunder and lightning insulating structure and the peripheral interference will influence the choice of neutral grounding mode Conversely neutral grounding mode affects design operation debugs and developing Generally in the system higher in grade in the voltage the insulating expenses account for more sizable proportion at the total price of the equipment It is very remarkable to bring the economic benefits by reducing the insulating level Usually such system adopt the neutral directly grounding and adopt the autoreclosing to guarantee power supply reliability On the contrary the system which is lower in the voltage adopts neutral none grounding to raise power supply reliability So it is an important subject to make use of new type earth device to apply to the distribution network under considering the situation in such factors of various fields as power supply reliability safety factor overvoltage factor the choice of relay protection investment cost etc
The main work of this paper is to research and choice the neutral grounding mode of the l0kV distribution network The neutral grounding mode of the l0kV network mainly adopts none grounding grounding by arc suppressing coil grounding by reactance grounding and directly grounding The best grounding mode is confirmed through the technology comparison It can help the network run in safety and limit the earth electric arc by using autotracking compensate device and using the line protection with the detection of the sensitive small ground current The paper introduces and analyzes the characteristic of all kind of grounding modes about l0kV network at first With the comparison with technological and economy the conclusion is drawn that the improved arc suppressing coil grounding mode shows a very big development potential
Then this paper researches and introduces some operation characteristics of the arc suppressing coil grounding mode of the l0kV distribution network And then the paper put emphasis on how to extinguish the earth electric arc effectively by utilizing the resonance principle This paper combines the development of domestic and international technology and innovative achievement and introduces the computer earth protection and autotracking compensate device It proves that the improved arc suppressing coil grounding mode have better operation characteristics in power supply reliability personal security security of equipment and interference of communication The application of the arc suppressing coil grounding mode is also researched in this paper
Finally the paper summarizes this topic research As a result of the domination of the arc suppressing coil grounding mode it should be more popularized and applied in the distribution network in the futureThe way of thinking project and conclusions in this thesis have effect on the research to choose the neutral grounding mode not only in I0kV distribution network but also in other power system
The basic function of the electric power system is to transport the electric power towards customers The l0kV electric distribution net is a key point that connects the power supply with the electricity using on the industry business and dailylife For the electric power all costumers expect to pay the lowest price for the highest reliability but don＇t consider that it＇s selfcontradictory in the coexistence of economy and reliable To improve the reliability of the power supply network we must increase the investment cost of the network con struction But if the cost that improve the reliability of the network construction but the investment on this kind of construction would be worthless if the reducing loss is on the poweroff is less than the increasing investment on improving the reliability Thus we find out a balance point to make the most economic between the investment and the loss by calculating the investment on power net and the loss brought from poweroff The thesis analyses on the economic and the reliable of the various line modes according to the characteristics various line modes existed in the electric distribution net in foshan
First the thesis introduces as the different line modes in the l0kV electric distribution net and in some foreign countries Making it clear tow to conduct analyzing on the line mode of the electric distribution net and telling us how important and necessary that analyses are
Second it turns to the necessity of calculating the number of optimization subsection elaborating how it influences on the economy and reliability Then by building up the calculation mode of the number of optimization subsection it introduces different power supply projects on the different line modes in brief Third it carries on the calculation and analyses towards the reliability and economy of the different line modes of electric distribution net describing drafts according by the calculation Then it makes analysis and discussion on the number of optimization subsection
At last the article make conclusion on the economy and reliability of different line modes as well as its application situation Accordion to the actual circumstance the thesis puts forward the beneficial suggestion on the programming and construction of the l0kV electric distribution net in all areas in foshan Providing the basic theories and beneficial guideline for the programming design of the lOkV electric distribution net and building up a solid net reasonable layout qualified safe and efficientlyworked electric distribution net
References
[1] Wencheng Su Factories power supply [M] Machinery Industry Publishing House 19999
[2] Jiecai Liu Factories power supply design guidance [M] Machinery Industry Publishing House199912
[3] Power supply and distribution system design specifications[S]China plans Press 1996
[4] Lowvoltage distribution design specifications [S]China plans Press 19966
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