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Quankum Effects of a Dissipative Mesoscopic Circuit with Mutual Inductance 认领 引用 被引量:10
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作者 JIYing-Hua NIEYi-You 《Communications in Theoretical Physics》 SCIE CAS 2002年第3期346-348,共3页
We study the quantum fluctuations of the charge and current of two L-C dissipative mesoscopic circuit with the mutual inductance in the vacuum state.Our results show that the system state will evolve to a squeezed coh... We study the quantum fluctuations of the charge and current of two L-C dissipative mesoscopic circuit with the mutual inductance in the vacuum state.Our results show that the system state will evolve to a squeezed coherent state under the effect of external source.We find that the squeezing amplitude parameter is relative to the parameters of circuit and the mutual-inductance coefficient in the existence of dissipation.When the circuit has no dissipation or there is complete coupling between two meshes,the squeezing amplitude parameter only depends on the capacitance's ratio. 展开更多
关键词 dissipative mesoscopic circuit quantum fluctuation mutual inductance squeezing amplitude parameter
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Simulation on Calculation Accuracy of Three Methods for Live Line Measuring the Parameters of Transmission Lines with Mutual Inductance 认领 引用
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作者 Jianjun Su Ronghua Zhang +6 位作者 Demin Cui Yongqiang Chai Xiaobo Li Chengxue Zhang Peiyan Li Zhijian Hu Yingying Hu 《Energy and Power Engineering》 2013年第4期1435-1439,共5页
Live line measurement methods can reduce the loss of power outages and eliminate interference. There are three live line measurement methods including integral method, differential method and algebraic method. A simul... Live line measurement methods can reduce the loss of power outages and eliminate interference. There are three live line measurement methods including integral method, differential method and algebraic method. A simulation model of?two coupled parallel transmission lines spanning on the same towers is built in PSCAD and the calculation errors of these three methods are compared with different sampling frequencies by using of Matlab. The effect of harmonic on calculation is also involved. The simulation results indicate that harmonic has the least effect on the algebraic method which provides stable result and small error. 展开更多
关键词 Lines with Mutual Inductance Zero Sequence Parameters Live Line Measurement Algebraic Method Differential Method Integral Method
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Live Line Measuring the Parameters of 220 kV Transmission Lines with Mutual Inductance in Hainan Power Grid 认领 引用
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作者 Zhongzhu Xu Zhijian Hu Chuanqi Li 《Engineering(科研)》 2013年第1期146-151,共6页
A live line measurement method for the zero sequence parameters of transmission lines with mutual inductance is introduced. The mathematical models of the measurement method are given. Global Positioning System (GPS) ... A live line measurement method for the zero sequence parameters of transmission lines with mutual inductance is introduced. The mathematical models of the measurement method are given. Global Positioning System (GPS) is used as the synchronous signal for the measurement carried out at different substations simultaneously. The measurement system and digital simulation results are given. Finally, the live line measurement results of two 220 kV transmission lines with mutual inductance in Hainangrid are given. Results from both simulation and on-site measurement show that the live line measurement method is feasible, and its measurement accuracy can satisfactorily meet the requirements of engineering measurement. 展开更多
关键词 Transmission lines Zero sequence parameter Mutual inductance Live line measurement GPS
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A Novel Computing Method for Mutual Inductance 认领 引用
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作者 Ph. Artillan B. Estibals +1 位作者 G. Montseny C. Alonso 《Journal of Energy and Power Engineering》 CAS 2011年第4期344-348,共5页
The design process for integrated inductors generally requires a geometry optimization step. During this step, many geometries must be simulated and fast and accurate formulae are therefore required for the computatio... The design process for integrated inductors generally requires a geometry optimization step. During this step, many geometries must be simulated and fast and accurate formulae are therefore required for the computation of self and mutual inductances of turns. This paper especially deals with numerical evaluation of the mutual inductance of two coaxial circular wire loops. Several computation methods are presented and compared. Finally, an expression is built-up and proven to be very few computing time consuming and 1% accurate for any kind of geometry. The application of this expression to integrated inductive components modelization is recalled to mind, however, this work gives a general and fast computable solution to the electromagnetic problem. 展开更多
关键词 Device modeling passive components mutual inductance circular wire loops.
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Cone-shaped source characteristics and inductance effect of transient electromagnetic method 认领 引用 被引量:16
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作者 杨海燕 李锋平 +3 位作者 岳建华 郭福生 刘旭华 张华 《Applied Geophysics》 SCIE CSCD 2017年第1期165-174,192,共10页
Small multi-turn coil devices are used with the transient electromagnetic method (TEM) in areas with limited space, particularly in underground environments such as coal mines roadways and engineering tunnels, and f... Small multi-turn coil devices are used with the transient electromagnetic method (TEM) in areas with limited space, particularly in underground environments such as coal mines roadways and engineering tunnels, and for detecting shallow geological targets in environmental and engineering fields. However, the equipment involved has strong mutual inductance coupling, which causes a lengthy turn-off time and a deep “blind zone”. This study proposes a new transmitter device with a conical-shape source and derives the radius formula of each coil and the mutual inductance coefficient of the cone. According to primary field characteristics, results of the two fields created, calculation of the conical-shaped source in a uniform medium using theoretical analysis, and a comparison of the inductance of the new device with that of the multi-turn coil, show that inductance of the multi-turn coil is nine times greater than that of the conical source with the same equivalent magnetic moment of 926.1 A·m2. This indicates that the new source leads to a much shallower “blind zone.” Furthermore, increasing the bottom radius and turn of the cone creates a larger mutual inductance but increasing the cone height results in a lower mutual inductance. Using the superposition principle, the primary and secondary magnetic fields for a conical source in a homogeneous medium are calculated; results indicate that the magnetic behavior of the cone is the same as that of the multi-turn coils, but the transient responses of the secondary field and the total field are more stronger than those of the multi-turn coils. To study the transient response characteristics using a cone-shaped source in a layered earth, a numerical filtering algorithm is then developed using the fast Hankel transform and the improved cosine transform, again using the superposition principle. During development, an average apparent resistivity inverted from the induced electromotive force using each coil is defined to represent the comprehensive resistivity of the conical source. To verify the forward calculation method, the transient responses of H type models and KH type models are calculated, and data are inverted using a “smoke ring” inversion. The results of inversion have good agreement with original models and show that the forward calculation method is effective. The results of this study provide an option for solving the problem of a deep “blind zone” and also provide a theoretical indicator for further research. 展开更多
关键词 Transient electromagnetic method Cone-shaped source Apparent resistivity Mutual inductance “Smoke ring” inversion
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A fitted formula for calculation of three-section solenoids inductance 认领 引用 被引量:1
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作者 Ju Jinchuan Wu Dapeng Shu Ting 《强激光与粒子束》 CAS CSCD 北大核心 2016年第2期61-64,共4页
An algorithm for precisely calculating the inductance of a three-section solenoid is presented, which is based on summing the layer self-inductances and the mutual inductances. A theoretical model with ex plicit expre... An algorithm for precisely calculating the inductance of a three-section solenoid is presented, which is based on summing the layer self-inductances and the mutual inductances. A theoretical model with ex plicit expressions is firstly developed to calculate the self-inductance of a single layer, and then numerical calcu lation of the mutual inductance between two layers is introduced. Using the presented computation method, the inductance of a solenoid designed in the experiment is successfully calculated (4.30 mH), which has a difference of less than 1% from the experimental data. 展开更多
关键词 three-section solenoid self-inductance mutual inductance er microwavemagnetic field high pow
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Mutual Inductance Calculation Between Arbitrarily Positioned Polygonal Coils 认领 引用 被引量:1
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作者 ZHANG Zijian SHAO Ming +5 位作者 SHANG Kai LI Xuekong HUANG Chunliang SHI Jinku CUI Huaxian DONG Yangyang 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2022年第S1期120-126,共7页
Polygonal coil systems are designed for increasing and more kinds of sensors and electromagnetic systems.This paper presents a method for calculating mutual inductance between polygonal coils including irregular polyg... Polygonal coil systems are designed for increasing and more kinds of sensors and electromagnetic systems.This paper presents a method for calculating mutual inductance between polygonal coils including irregular polygons.Based on the Biot-Savart law,the method calculates mutual inductance by dividing a polygonal coil into finite wires,and expresses the magnetic induction intensity generated by the excitation coil as a function of the spatial position of each vertex of the coil.The calculation method of the feasible region of the objective function is updated and the calculation process is simplified,so the calculation accuracy is improved.For octagon coils arbitrarily positioned in space,the accuracy of the algorithm is verified by the simulation and experiment. 展开更多
关键词 mutual inductance polygonal coils Biot-Savart law arbitrary position
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基于发射端信息的无线电能传输系统负载与互感辨识方法 认领 引用 被引量:1
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作者 张岩 都义彬 +2 位作者 臧朝辉 张玉旺 张献 《电工技术学报》 EI CSCD 北大核心 2026年第6期1860-1871,共12页
无线电能传输(WPT)系统的传输效率与功率容量在很大程度上易受负载和互感参数变化的影响。通过引入参数辨识技术对两者进行估计,将有助于WPT系统的状态监测和控制算法优化,从而提高系统性能。该文基于双边电感-电容-电容补偿(DLCC)拓扑... 无线电能传输(WPT)系统的传输效率与功率容量在很大程度上易受负载和互感参数变化的影响。通过引入参数辨识技术对两者进行估计,将有助于WPT系统的状态监测和控制算法优化,从而提高系统性能。该文基于双边电感-电容-电容补偿(DLCC)拓扑的WPT系统,提出一种仅通过采集发射端并联补偿电容两端电压信息,便能实时对互感和负载参数联合辨识的方法。首先,基于WPT系统的稳态特性,利用自定义的传输阻抗表达式,初步得到负载、互感与采集量之间的耦合方程组。其次,为对辨识算法进一步优化,在保证辨识算法精度的同时,利用定义系数进一步化简方程组,实现负载和互感的解耦,最终将求解复杂耦合方程组问题转化为仅包含负载参数的三次方程求解问题。然后,根据负载辨识结果,推导系统采集量与互感之间的量化关系表达式,并阐述具体的辨识流程与步骤。最后,搭建WPT系统样机进行实验验证,结果表明,该方法在变互感和变负载工况下,两者最大辨识误差分别为5.3%和6.9%,具有较高的辨识精度。 展开更多
关键词 无线电能传输 参数辨识 互感识别 参数分离
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基于贝杰龙算法的单级LTD全电路数值模拟 认领 引用 被引量:1
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作者 降宏瑜 姜晓峰 +3 位作者 孙凤举 楼成 魏浩 邱爱慈 《高电压技术》 EI CAS CSCD 北大核心 2026年第4期1936-1946,共11页
基于贝杰龙算法,建立了直线型变压器驱动源(linear transformer driver,LTD)放电支路和单级模块的全电路数值计算模型,结合气体开关火花通道电阻和单级LTD模块放电特性的实验结果对模型进行验证,实现了从放电支路到单级模块的自洽模拟... 基于贝杰龙算法,建立了直线型变压器驱动源(linear transformer driver,LTD)放电支路和单级模块的全电路数值计算模型,结合气体开关火花通道电阻和单级LTD模块放电特性的实验结果对模型进行验证,实现了从放电支路到单级模块的自洽模拟。结果表明,考虑了气体开关火花通道电阻动态特性、放电支路间电磁耦合、开关触发导通时刻的电路模型,能够精确预测单级LTD的输出特性。单级LTD在充电±100 kV时,驱动近似匹配电阻负载,输出峰值功率为82 GW,负载的能量利用效率约为80%,其中气体开关火花通道电阻损耗能量占比为5.7%。该单级LTD全电路仿真方法可为LTD型脉冲功率装置的全电路模型仿真奠定基础。 展开更多
关键词 直线型变压器驱动源 贝杰龙算法 气体开关火花通道电阻 支路互感 能量效率
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基于辅助线圈的无线充电系统三边定位技术研究 认领 引用 被引量:1
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作者 陈起旭 李鹏 王群京 《传感器与微系统》 北大核心 2026年第3期36-43,共8页
无线电力传输(WPT)基于非接触方式进行电力传输。WPT系统工作时,发射线圈与接收线圈会存在相对位置的偏移,使得线圈间互感降低,系统无法工作在最佳工况。在三边定位技术的基础之上,提出基于质心定位和最小二乘法定位的三边定位算法,建... 无线电力传输(WPT)基于非接触方式进行电力传输。WPT系统工作时,发射线圈与接收线圈会存在相对位置的偏移,使得线圈间互感降低,系统无法工作在最佳工况。在三边定位技术的基础之上,提出基于质心定位和最小二乘法定位的三边定位算法,建立了三辅助线圈系统仿真模型,仿真确认了当接收线圈与辅助线圈之间的距离d1≥84.53 mm时,线圈组之间的交叉互感可忽略不计,在此基础上,实现了发射线圈的精确定位,为收、发线圈对中、提升传输性能提供依据。仿真和实验表明了所提的两种定位算法的可行性。 展开更多
关键词 无线电力传输 互感 三边定位 质心法 最小二乘法
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基于原边检测的MCR-WPT系统参数辨识方法 认领 引用
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作者 舒中宾 黎伟杰 李中启 《湖南工业大学学报》 2026年第3期33-40,共8页
针对磁耦合无线电能传输系统负载与互感辨识方法复杂且辨识精度较低的问题,提出了一种MCR-WPT系统的负载与互感同时辨识方法。首先,在考虑系统高次谐波的影响下,建立LCC-S拓扑系统稳态电路模型并进行验证,得到原边逆变器输出电流与互感... 针对磁耦合无线电能传输系统负载与互感辨识方法复杂且辨识精度较低的问题,提出了一种MCR-WPT系统的负载与互感同时辨识方法。首先,在考虑系统高次谐波的影响下,建立LCC-S拓扑系统稳态电路模型并进行验证,得到原边逆变器输出电流与互感、负载的数学描述;其次,引入改进粒子群算法,以原边逆变器输出电流理论值与实际值之间的误差构建适应度函数,将系统的参数辨识问题转化为寻优问题,从而得到系统负载以及互感的辨识值;最后,仿真结果表明,所提方法辨识的负载与互感值误差均不超过1.20%,非常接近实际值,验证了所提方法的正确性。该方法可被应用于谐振和非谐振MCR-WPT系统,且不受补偿网络的限制,无需原副边通信、辅助电路即可精确辨识负载和互感参数。 展开更多
关键词 无线电能传输 改进粒子群算法 负载辨识 互感辨识
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基于电磁互感的并联功率器件双脉冲测试模型 认领 引用 被引量:1
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作者 任雷浩 李克俭 +6 位作者 刘贵 任兴旺 李思 刘敏 张雪松 章雷其 吴启亮 《南方电网技术》 CSCD 北大核心 2026年第2期23-29,共7页
为减小因并联功率器件不均流导致双脉冲测试不充分问题带来的影响,对并联功率器件的双脉冲测试方式进行了研究。以IGBT为例对双脉冲测试原理进行研究,建立了更改电流回路路径下并联功率器件双脉冲测试电流不均流度的理论模型,并通过实... 为减小因并联功率器件不均流导致双脉冲测试不充分问题带来的影响,对并联功率器件的双脉冲测试方式进行了研究。以IGBT为例对双脉冲测试原理进行研究,建立了更改电流回路路径下并联功率器件双脉冲测试电流不均流度的理论模型,并通过实验进行了验证。结果表明,通过对比实验发现更改回路电流路径可以减小并联功率器件电流的不均流度,与理论模型相符;400 V电压下电流不均流度由43%降至3.2%;1500 V电压下电流1.2倍及1.4倍的过载时功率器件的不均流度为2.8%,可以充分完成所有功率器件的双脉冲测试,解决了由于不均流导致测试不充分的问题。研究成果为多并联功率器件的双脉冲充分测试提供理论及实验基础。 展开更多
关键词 功率器件 多并联 电磁互感 双脉冲测试 IGBT
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面向金属环境的应答器传输特性研究 认领 引用
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作者 叶轲 焦敬品 +2 位作者 徐清 丁欢 陈方华 《铁道科学与工程学报》 EI CAS CSCD 北大核心 2026年第5期2368-2379,共12页
轨道应答器作为列车控制系统中的关键组件,对实现精准的位置感知和确保安全行车起着不可或缺的作用。然而,在金属环境下,应答器往往面临谐振频率偏移和磁场分布改变等问题,导致射频传输性能显著下降,甚至无法正常安装和运行,从而对高铁... 轨道应答器作为列车控制系统中的关键组件,对实现精准的位置感知和确保安全行车起着不可或缺的作用。然而,在金属环境下,应答器往往面临谐振频率偏移和磁场分布改变等问题,导致射频传输性能显著下降,甚至无法正常安装和运行,从而对高铁系统的可靠性构成潜在威胁。以金属环境下应答器与车载天线单元之间的射频能量信号链路传输过程为例,构建链路传输的电气模型,采用双重傅里叶变换的方法,推导出金属屏蔽条件下应答器与车载天线单元之间的磁通密度分布公式。在此基础上,进一步计算应答器在金属环境中的谐振频率偏移,以及应答器与车载天线单元之间的互感参数变化。通过系统探究金属板逐渐靠近应答器时互感参数的演变规律,分析距离、材料属性和相对安装高度等参数对系统S21参数和应答器谐振频率的影响。为验证模型的有效性,在Comsol多物理场仿真软件和ADS电路设计软件中进行数值模拟,并将仿真结果与计算结果、实验测量数据进行比对。结果表明,在金属环境中,提出的解析模型不仅能够准确预测应答器的谐振频率偏移,也能反映传输过程中互感参数的变化趋势。将解析模型预测的结果应用于应答器互联互通测试中,对预测的应答器谐振频率提前进行干预,通过调整应答器谐振频率或改变安装高度等措施来优化系统的传输性能,能有效缓解金属环境对应答器传输系统的负面影响,使应答器在金属环境下的输入输出特性能够满足测试规范的要求。研究结果为进一步优化应答器在金属环境下的安装和保障高铁安全运营提供参考。 展开更多
关键词 应答器 磁耦合模型 互感 金属板 频率偏移
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岩土体深部位移三维监测综合系统研究 认领 引用
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作者 杨玉斌 李青 +3 位作者 方元丰 张宪阳 汤文浩 裘凯军 《传感技术学报》 CAS CSCD 北大核心 2026年第5期959-971,共13页
设计了一款针对于滑坡地质灾害避险监测的岩土体深部位移三维测量综合系统,综合系统包括以下四个部分:图像显示上位机、低功耗设计、无线通信组网设计、无线能量传输电路的初步实现。该系统的下位机基于双互感等值电压原理、接力式无线... 设计了一款针对于滑坡地质灾害避险监测的岩土体深部位移三维测量综合系统,综合系统包括以下四个部分:图像显示上位机、低功耗设计、无线通信组网设计、无线能量传输电路的初步实现。该系统的下位机基于双互感等值电压原理、接力式无线通信BLE5.0网络、磁耦合谐振式无线充电技术实现,在原无线通讯传感器的基础上,对通讯速率进行优化,硬件与软件低功耗优化设计配合使用来降低传感器功耗,初步实现无线充电结合无线通信的传感器电路模型,可以在不需要电源线的情况下实现各级传感器的接力式通讯。经实验证明,采集到的相对水平位移和竖直位移误差在1 mm以内,满足实际地下位移三维测量要求。 展开更多
关键词 三维测量 双互感 接力式通讯 磁耦合谐振式无线充电
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平面螺旋线圈电感参数的计算及实验验证 认领 引用
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作者 欧阳萱 梅中磊 《物理实验》 2026年第3期10-15,共6页
针对平面螺旋线圈电感计算复杂、误差较大等问题,提出了适用于圆形与矩形平面螺旋线圈电感参数的简便计算方法.对圆形螺旋线圈,结合阿基米德螺线模型与诺依曼公式推导其电感的解析表达式;对矩形螺旋线圈,利用导体路径分段法求解各段导... 针对平面螺旋线圈电感计算复杂、误差较大等问题,提出了适用于圆形与矩形平面螺旋线圈电感参数的简便计算方法.对圆形螺旋线圈,结合阿基米德螺线模型与诺依曼公式推导其电感的解析表达式;对矩形螺旋线圈,利用导体路径分段法求解各段导线的自感与互感表达式,并利用叠加原理获得总电感的解析表达式.通过ANSYS Maxwell验证理论模型,进一步设计并制造PCB螺旋线圈进行测试.结果表明:理论计算、实验测量与仿真结果在单层结构、双层结构中的相对偏差分别约为±5%和±7%,验证了方法的准确性.该方法不仅适用无线电能传输领域,也可推广至高校相关专业的课程实验教学,提升学生对电磁场计算与工程建模能力. 展开更多
关键词 自感 互感 诺依曼公式 平面螺旋线圈
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一种互感耦合下的SRM无位置传感器控制策略 认领 引用
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作者 梅谦 蔡辉 《微特电机》 2026年第3期48-53,共6页
开关磁阻电机在采用电流斩波控制(current chopping control,CCC)时,导通相与脉冲注入相之间的单侧互感耦合会对转子位置的估计精度产生影响。针对此问题,本文通过有限元仿真深入分析导通相励磁电流产生的磁场对注入相高频信号产生干扰... 开关磁阻电机在采用电流斩波控制(current chopping control,CCC)时,导通相与脉冲注入相之间的单侧互感耦合会对转子位置的估计精度产生影响。针对此问题,本文通过有限元仿真深入分析导通相励磁电流产生的磁场对注入相高频信号产生干扰的原因,并通过分析电机运行时的三相电感曲线等信息,提出了一种基于特殊位置点在线检测的开关磁阻电机转子位置辨识技术,以此实现无位置传感器控制。该策略通过分析电机全周期三相电感曲线以及单侧互感耦合的特征选取特殊位置点,有效降低了互感耦合对注入相自感信息获取的影响,在互感耦合对脉冲注入相自感的相对影响达到13.81%时,将特殊位置点的最大偏移范围控制在0.45°以内,且最大偏移量不超过0.65°,因此通过检测特殊位置点来估算转子的实时位置。实验结果表明,本方案可以有效降低由单侧相间互感耦合影响所导致的转子位置估计误差,提高控制精度。 展开更多
关键词 开关磁阻电机 无位置传感器 单侧互感耦合 转子位置估计
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考虑绕组互感的永磁同步电动机的Simscape建模研究 认领 引用
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作者 杨刃 王家军 辛壮壮 《杭州电子科技大学学报(自然科学版)》 2026年第4期80-87,共8页
基于三相静止坐标系下永磁同步电动机(Permanent Magnet Synchronous Motor,PMSM)的电压方程并借助Simscape搭建了一种考虑绕组互感的PMSM模型。该模型克服了MATLAB/Simulink中的PMSM模型集成度高、参数修改不便等问题,并在传统PMSM模... 基于三相静止坐标系下永磁同步电动机(Permanent Magnet Synchronous Motor,PMSM)的电压方程并借助Simscape搭建了一种考虑绕组互感的PMSM模型。该模型克服了MATLAB/Simulink中的PMSM模型集成度高、参数修改不便等问题,并在传统PMSM模型功能的基础上增加了电机三相绕组自感、互感与反电动势参数的输出功能。通过搭建矢量控制系统仿真模型,并与传统PMSM模型的输出波形进行对比,验证了电机模型的正确性,为三相静止坐标系下PMSM建模仿真研究提供帮助。 展开更多
关键词 永磁同步电动机建模 互感特性 Simscape 矢量控制
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电梯钢带内部钢丝断丝在线检测方法研究 认领 引用
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作者 李剑平 《机械管理开发》 2026年第7期258-260,共3页
针对电梯曳引钢带内部钢丝断丝难以实时监测的问题,提出一种分段模块化互感式电涡流检测系统。通过设计可开合式探头结构与跑道型接收线圈,结合高频激励信号与高精度采集模块,实现了对钢带内部断丝缺陷的在线、无损检测。实验结果表明,... 针对电梯曳引钢带内部钢丝断丝难以实时监测的问题,提出一种分段模块化互感式电涡流检测系统。通过设计可开合式探头结构与跑道型接收线圈,结合高频激励信号与高精度采集模块,实现了对钢带内部断丝缺陷的在线、无损检测。实验结果表明,系统在0.5 m/s运行速度下可稳定识别至少4根断丝损伤,信号峰值与断丝数量呈正相关,具备高灵敏度与强抗干扰能力。该系统为电梯钢带的安全监测与预测性维护提供了有效的技术解决方案。 展开更多
关键词 电梯钢带 钢丝断丝 电涡流 分段互感式探头
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电压互感下的10 kV三相五柱式PT小电流接地故障实时告警方法 认领 引用
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作者 陈银勇 邓伟锋 卢颖先 《微型电脑应用》 2026年第7期360-364,共5页
小电流接地系统出现接地故障时,因故障电流极小,三相线电压变化幅度不大,故障特征不显著,所以故障检测难度较大,对此,提出电压互感下的10 kV三相五柱式电压互感器(PT)小电流接地故障实时告警方法。配合使用三相五柱式PT与基于电压互感... 小电流接地系统出现接地故障时,因故障电流极小,三相线电压变化幅度不大,故障特征不显著,所以故障检测难度较大,对此,提出电压互感下的10 kV三相五柱式电压互感器(PT)小电流接地故障实时告警方法。配合使用三相五柱式PT与基于电压互感的新型接地电阻检测仪,由接地电阻检测仪采集线路电流信号,由基于高斯滤波器的信号滤波方法去除信号噪声成分后,设计基于欧姆定律的接地电阻越限分析方法,计算线路末端电阻是否越限,若越限便驱动报警电路,发出告警提示信息。实验结果显示,所提出的方法在10 kV配电网谐振接地系统中表现出色,能够准确检测到小电流接地故障,并实时发出告警提示信息。 展开更多
关键词 PT小电流 接地故障 电压互感 10 kV配电网 三相五柱式 实时告警
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Research on Electromagnetic Characteristics of the Inductively Coupled Coil for Small Animal MR Imaging 认领 引用
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作者 CAI Jing WANG Xiu-bin 《Chinese Journal of Biomedical Engineering(English Edition)》 CAS 2022年第3期93-100,共8页
The inductively coupled coils principally consist of two coils with no physical connection in between.A major problem is a mutual inductance between the two coils,which caused the frequency response peaks splitting.In... The inductively coupled coils principally consist of two coils with no physical connection in between.A major problem is a mutual inductance between the two coils,which caused the frequency response peaks splitting.In this study,it was found that the position of the splitting of the peaks is not only related to the coupling coefficient(k)but also related to the quality factor(Q)of the coil.Based on this research,we construct a coupled coil for use in a 1.5T clinical MR scanner,this coil,comprising two semicircular coils fixed symmetrically around on a cylinde frame,was designed and constructed.The3-inch surface coil supplied by the MR scanner was used to compare imaging performance with the coupled coil.A water phantom was used for the signal-to-noise ratio(SNR)measurements.A total of 52 male Sprague-Dawley rats and 16 male BALB/C nude mice were scanned in this study for feasibility evaluation. 展开更多
关键词 magnetic resonance imaging coupling coefficient mutual inductance
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