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大型火力发电厂高厂变和高压起备变用电流互感器性能和配置方案 被引量:2
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作者 盛和乐 孙茗 何赞峰 《电力自动化设备》 EI CSCD 北大核心 2008年第1期113-118,共6页
针对当前大型火力发电厂300 MW、600 MW、1 000 MW级机组高压厂用电接线和高压起动/备用变压器接线种类繁多,测量、保护用电流互感器数量及参数每个工程各异,是否采用TPY级的电流互感器有不同看法的情况,按照《电流互感器和电压互感器... 针对当前大型火力发电厂300 MW、600 MW、1 000 MW级机组高压厂用电接线和高压起动/备用变压器接线种类繁多,测量、保护用电流互感器数量及参数每个工程各异,是否采用TPY级的电流互感器有不同看法的情况,按照《电流互感器和电压互感器选择和应用导则》及国内大型火力发电厂配置的高压厂用变压器和高压起动/备用变压器的典型参数,通过计算分析,提出了大型火力发电厂高压厂用变压器和高压起动/备用变压器在各种接线方式下的电流互感器的配置方案,给出了合理的结论,以规范大型火力发电厂在该方面的设计思路。 展开更多
关键词 大型火力发电厂 电流互感器 高厂变 起备变 电流互感器配置
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110kV内桥接线智能变电站电流回路配置及相关检修策略 被引量:1
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作者 张勇 孙运乾 +2 位作者 王晓娟 耿艺瑞 徐文 《电工技术》 2018年第15期129-131,共3页
通过分析内桥接线形式下智能变电站电流回路配置不同方案,得出不同设计方案的优缺点及检修策略,最后以110kV鹭湖变电站为例,叙述内桥分段电流回路配置特殊性及在鹭湖变电站施工时存在的问题,为内桥接线形式的智能变电站设计和检修提供... 通过分析内桥接线形式下智能变电站电流回路配置不同方案,得出不同设计方案的优缺点及检修策略,最后以110kV鹭湖变电站为例,叙述内桥分段电流回路配置特殊性及在鹭湖变电站施工时存在的问题,为内桥接线形式的智能变电站设计和检修提供参考。 展开更多
关键词 内桥接线 电流回路配置 检修策略
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大型发电机变压器组成套保护双重化配置及有关问题 被引量:8
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作者 孙茗 盛和乐 周刚 《电力自动化设备》 EI CSCD 北大核心 2003年第8期73-78,共6页
针对国电公司《反措》25条实施细则及继电保护规程,提出了大型发电机变压器组成套保护双重化配置的原则,涉及电流互感器及电压互感器配置的基本原则,并介绍了两种典型的配置方案。接着提出了发电机变压器组保护双重化配置方案、保护组... 针对国电公司《反措》25条实施细则及继电保护规程,提出了大型发电机变压器组成套保护双重化配置的原则,涉及电流互感器及电压互感器配置的基本原则,并介绍了两种典型的配置方案。接着提出了发电机变压器组保护双重化配置方案、保护组柜原则,提出了有意义的建议,同时指出了《规程》、《反措》中的不足和矛盾。希望将有关原则纳入修编的继电保护和安全自动装置技术规程。 展开更多
关键词 《反措》 保护双重化配置 电流互感器配置 电压互感器配置
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电流互感器安装位置对差动保护的影响分析 被引量:1
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作者 魏春芝 《科技资讯》 2018年第26期27-28,共2页
电流差动保护一般应用于变压器、电机及输电线路等重要电气设备的一种继电保护,它具有快速切除故障、灵敏性高和高可靠性的优点。电流差动保护一般由电流互感器、二次回路、微机保护装置及开关设备组成,其中电流互感器为其故障参数采集... 电流差动保护一般应用于变压器、电机及输电线路等重要电气设备的一种继电保护,它具有快速切除故障、灵敏性高和高可靠性的优点。电流差动保护一般由电流互感器、二次回路、微机保护装置及开关设备组成,其中电流互感器为其故障参数采集元件,其安装的正确与否直接影响电流差动保护的正常运行,本文以高压电动机差动保护为例,结合现场调试及试运经验,对常见差动保护电流互感器安装位置方案的优缺点进行了分析,提出了最佳配置方案,并对常见安装位置故障进行了分析论证。 展开更多
关键词 高压电动机 差动保护 电流互感器配置
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单CT配置方式下线路末端故障快切风险分析及解决方案
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作者 高逸舟 《通信电源技术》 2023年第16期242-244,共3页
电力系统中,传统的故障快切方案是根据不同线路末端的电流进行切除,因此需要为每个线路末端配置独立的电流互感器,增加了系统成本和工程实施难度。在单电流互感器(Current Transformer,CT)配置方式下,所有线路末端共用一个CT,能够减少成... 电力系统中,传统的故障快切方案是根据不同线路末端的电流进行切除,因此需要为每个线路末端配置独立的电流互感器,增加了系统成本和工程实施难度。在单电流互感器(Current Transformer,CT)配置方式下,所有线路末端共用一个CT,能够减少成本,但会增加故障快切的风险。通过对单CT配置方式下线路末端故障快切风险的分析,发现存在的问题主要表现为CT采集电流和提供电流信息单一,可能引起保护误动作或漏动作。为解决这些问题,提出定值优化和跳位加速逻辑的解决方案。 展开更多
关键词 电流互感器(CT)配置 故障快切 定值优化 跳位加速逻辑
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Nonlinear Auto-Companding Method for Behavioral Modeling of Switched-Current Circuits
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作者 王伟 曾璇 +2 位作者 陶俊 苏仰峰 唐璞山 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2002年第12期1254-1261,共8页
A wavelet collocation method with nonlinear auto companding is proposed for behavioral modeling of switched current circuits.The companding function is automatically constructed according to the initial error distri... A wavelet collocation method with nonlinear auto companding is proposed for behavioral modeling of switched current circuits.The companding function is automatically constructed according to the initial error distribution obtained through approximating the input output function of the SI circuit by conventional wavelet collocation method.In practical applications,the proposed method is a general purpose approach,by which both the small signal effect and the large signal effect are modeled in a unified formulation to ease the process of modeling and simulation.Compared with the published modeling approaches,the proposed nonlinear auto companding method works more efficiently not only in controlling the error distribution but also in reducing the modeling errors.To demonstrate the promising features of the proposed method,several SI circuits are employed as examples to be modeled and simulated. 展开更多
关键词 wavelet collocation method behavioral modeling switched current circuits nonlinear auto companding
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一种可配置输出电流的LED电源设计
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作者 蔡如海 钟礼健 《中国照明电器》 2016年第3期15-18,28,共5页
设计1种可配置输出电流的LED电源,包括前级AC/DC开关电源、后级恒流驱动电路和调光控制电路。前级AC/DC电源给后级驱动电路提供恒定电压,调光控制电路具有数字DALI接口(可寻址数字照明接口)、控制按键和LED指示灯,通过按键或数字DALI接... 设计1种可配置输出电流的LED电源,包括前级AC/DC开关电源、后级恒流驱动电路和调光控制电路。前级AC/DC电源给后级驱动电路提供恒定电压,调光控制电路具有数字DALI接口(可寻址数字照明接口)、控制按键和LED指示灯,通过按键或数字DALI接口可以配置输出电流值,通过数字DALI接口可读回电源工作参数,包括输出电流、内部温度值、负载状态等,驱动电压在较大范围内自动适应。本文的技术可应用于室内外LED照明调光控制。 展开更多
关键词 LED电源 恒流驱动 DALI接口 配置电流 调光控制
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220kV母差保护改造方案及难点分析 被引量:3
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作者 张健 王舒 +1 位作者 张佳薇 胡宇先 《东北电力技术》 2015年第7期51-53,共3页
母线保护是保证电网安全稳定运行的重要系统设备,其安全性、可靠性、灵敏性和快速性对保证整个区域电网的安全具有决定性的意义,根据十八项电网重大反事故措施要求,220 k V等级以上母线保护必须双重化配置。以东鞍山220k V变电站母差保... 母线保护是保证电网安全稳定运行的重要系统设备,其安全性、可靠性、灵敏性和快速性对保证整个区域电网的安全具有决定性的意义,根据十八项电网重大反事故措施要求,220 k V等级以上母线保护必须双重化配置。以东鞍山220k V变电站母差保护改造为例,针对母线保护双重化改造中的施工方案及技术难点进行分析总结,为同类变电站改造提供参考。 展开更多
关键词 母差保护 双重化 电流互感器配置 失灵回路
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Power flow tracing based method for allocation of transmission service cost to transactions
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作者 李卫东 刘娆 魏立明 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第4期464-468,共5页
Based on the concepts of objective fact and subjective desire proposed in this paper, the problems that exist in the nodal injections-based and transaction-based transmission service allocation scheme are pointed out.... Based on the concepts of objective fact and subjective desire proposed in this paper, the problems that exist in the nodal injections-based and transaction-based transmission service allocation scheme are pointed out. To get around the problems above, a novel transmission service allocation scheme is proposed which considers the power flow distribution and the transaction impact on the system simultaneously so that the issues of “Cross-subsidies” and “Counter flow” can be avoided. The principle of the scheme is illustrated using two simple networks with 7 cases. The results show that the proposed scheme can satisfy the properties necessary for the development and growth of the electricity market. 展开更多
关键词 transmission open access transmission service cost allocation
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A New Configuration for Planar Magnetic Elements to Reduce Capacitive Couplings
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作者 N. Shahabi A.A Boora F. Zare G. Ledwich A. Ghosh 《Journal of Energy and Power Engineering》 2011年第10期966-971,共6页
This paper presents an analysis of planar magnetic element configurations in order to reduce capacitive couplings between the windings. The capacitive couplings between layers of planar magnetic elements introduce a s... This paper presents an analysis of planar magnetic element configurations in order to reduce capacitive couplings between the windings. The capacitive couplings between layers of planar magnetic elements introduce a stray capacitor which can conduct high frequency currents when high dv/dt voltage is applied. High frequency current may cause electromagnetic interference (EMI) and harmonic problems. The investigation and simulation results, both 2D and 3D Finite Element (FE) show the effect of shifting the planar layers in reduction of the capacitive couplings. The simulation results are compared with test results to validate the proposition. 展开更多
关键词 Planar magnetic elements capacitive coupling finite element.
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Investigation of micro vortex generators on controlling flow separation over SCCH high-lift configuration 被引量:4
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作者 CHU HuBing ZHANG BinQian +2 位作者 CHEN YingChun LI YaLin MAO Jun 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第7期1943-1953,共11页
For the problem that the flow separation on the flap lowers the aerodynamic performance of high lift system,an investigation was carried out on using micro vortex generators(VGs) to control the separation on flap of t... For the problem that the flow separation on the flap lowers the aerodynamic performance of high lift system,an investigation was carried out on using micro vortex generators(VGs) to control the separation on flap of the swept constant chord half-model(SCCH) high-lift configuration,at a small to medium angle of attack,by experimental and numerical methods.The basic flow characteristics of SCCH landing configuration were analyzed by using numerical method to provide required information for the design of micro VGs.Then,by keeping the cruise configuration intact,the preliminary design procedure and design methods of micro VGs were established.In addition,the micro VGs were designed.The effects of VG's arrangement and geometric parameters,such as the arrangement mode,chordwise position,arrangement angle,height and spanwise distance,on controlling efficiency were investigated by using numerical method.Then the parameters of preliminary VGs were adjusted as the basis configuration for wind tunnel test.The experiments were accomplished in NH-2 wind tunnel for validating the numerical method,as well as obtaining the design principles and methods of micro VGs.The parameters of VGs were also optimized based on the experiments.The experimental results showed that the numerical design method can serve as an efficient and accurate design tool.The lift and drag were increased by 10% and 14%,respectively in landing state,which satisfied the requirements for landing.Finally,it was concluded that the established design principles and methods for micro VGs in this investigation can be used in engineering application. 展开更多
关键词 micro vortex generators high lift system flow control numerical simulation wind tunnel test
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Qualitative analysis on adiabatic and dynamic stability of LTS/HTS hybrid conductor with concentric configuration 被引量:2
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作者 WANG YinShun LI Xiao +1 位作者 XUE Chi ZHAO LianQi 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第7期1881-1885,共5页
The I-V characteristic of a superconductor is generally described by power-law,in which the superconductor with a high n transfers quickly from superconducting state to the normal conducting state.With a high transpor... The I-V characteristic of a superconductor is generally described by power-law,in which the superconductor with a high n transfers quickly from superconducting state to the normal conducting state.With a high transport current,in the low n value area,flux flow voltage becomes lower than in the high n value area,so that the transient characteristics strongly affect its stability.Based on those properties,we propose a new hybrid conductor which is made of low temperature superconductor(LTS) and high temperature superconductor(HTS) with concentric configuration in which the HTS coat is located outside of the LTS core.According to their power-law models,the modified adiabatic and dynamic stability criteria are qualitatively obtained by taking account into not only their critical currents but also n values.As a result,the new hybrid conductors have potential applications with higher engineering current density and improved stability. 展开更多
关键词 adiabatic stability criteria concentric configuration dynamic stability hybrid conductor n value
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Multi-objective optimal configuration of current limiting strategies 被引量:2
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作者 YE ChengJin HUANG MinXiang 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第9期1738-1749,共12页
With the level of short-circuit current of power systems growing increasingly higher,optimal allocation of current limiters has received considerable attention in recent years,especially in China.This paper analyzes t... With the level of short-circuit current of power systems growing increasingly higher,optimal allocation of current limiters has received considerable attention in recent years,especially in China.This paper analyzes two kinds of common used current limiters based on the increment of bus impedance matrix and proposes a multi-objective current limiters configuration model considering the investment of limiters,the level of short-circuit current,as well as the transient stability of power system.An innovative search space reduction technique based on sensitivity factor is introduced to choose better candidate locations for current limiters so as to avoid the curse of dimensionality.The elitist non-dominated sorting genetic algorithm II is used to search the Pareto-optimal solutions of the proposed model.In order to further improve optimization efficiency,master-slave parallel modification of NSGA-II program structure is implemented.The satisfactory case study results demonstrate the feasibility of the proposed multi-objective method in power system current limiters allocation associated with cost,security and stability. 展开更多
关键词 power system short-circuit current limiter transient stability multi-objective optimization NSGA-II sensitivity factor parallel computing
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Optimum allocation of FACTS devices in Fars Regional Electric Network using genetic algorithm based goal attainment
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作者 Mohsen GITIZADEH Mohsen KALANTAR 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第4期478-487,共10页
This paper presents a novel approach to find optimum locations and capacity of flexible alternating current transmission system (FACTS) devices in a power system using a multi-objective optimization function. Thyristo... This paper presents a novel approach to find optimum locations and capacity of flexible alternating current transmission system (FACTS) devices in a power system using a multi-objective optimization function. Thyristor controlled series compensators (TCSCs) and static var compensators (SVCs) are the utilized FACTS devices. Our objectives are active power loss reduction, newly introduced FACTS devices cost reduction, voltage deviation reduction, and increase on the robustness of the security margin against voltage collapse. The operational and controlling constraints, as well as load constraints, were considered in the optimum allocation. A goal attainment method based on the genetic algorithm (GA) was used to approach the global optimum. The estimated annual load profile was utilized in a sequential quadratic programming (SQP) optimization sub-problem to the optimum siting and sizing of FACTS devices. Fars Regional Electric Network was selected as a practical system to validate the performance and effectiveness of the proposed method. The entire investment of the FACTS devices was paid off and an additional 2.4% savings was made. The cost reduction of peak point power generation implies that power plant expansion can be postponed. 展开更多
关键词 Flexible alternating current transmission system (FACTS) devices allocation Multi-objective optimization Geneticalgorithm (GA) Goal attainment
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