The paper proposes a new distance protection scheme, and it consists of 6 ground impedance relay and 15 inter-phases impedance relay.
5提出了一种适用于六相输电线路的距离保护方案，该保护由6个接地阻抗继电器和15个相间阻抗继电器组成。
The paper analyses the limitation of the differentiation idelta I protection method, which puts forward traveling wave protection method for the DC power supply system that is based on interrelated characteristics of the traveling wave and the unit impedance of the transmission line. The traveling wave protection method overcomes the disadvantage of the traditional method in which the protection action is affected by the overall impedance of the circuit, and thus improves the reliability and sensibility of the relay protection system.
通过深入分析行波仅与传输线单位阻抗有关的传播特性，提取直流牵引供电系统的瞬变信息，建立了直流牵引供电系统的行波保护模型，克服了电流保护和di/dt-ΔI保护受线路总阻抗影响的弊端，从而提高了保护装置的可靠性和速动性。
The mid-impedance protection is of following advantages:short tripping time, better performance of anti-saturation of CT, easy to implementation and more reliable.
最后指出中阻抗母线保护方案在快速动作、较好的抗CT饱和性能、装置原理及实现简单、可靠等方面具有较大的优势。
The existence of fault resistance may add an additional reactive or capacitive component to the impedance seen by the protection.
在双电源系统中，由于对侧系统助增电流的影响，保护测量到的阻抗会偏离故障线路的实际值，从而引起距离保护发生超越或缩短保护距离。
An impedance-protected motor is not required to have additional thermal or overload protection.
有阻抗保护的马达不须附加过热，过载保护。
A novel adaptive algorithm for high-resistance earth-fault digital distance protection based on real-time impedance locus estimation is put forward.
该继电器利用故障前系统正常运行时电压和电流的测量值，实时估计出阻抗变化轨迹，并自动调整继电器的动作特性。
The protection film formed is lucent and with high insulation impedance, its impedance value is greater than 1×1012Ω, so it is suitable to high and low electric devices.
SME99形成的保护膜具有全透明性，保护膜具有十分高的绝缘阻抗，其阻抗值大于1X1012Ω。对高低压设备均适用。
The protection principle on the basis of impedance angle is analyzed.
2基于Agent的广域协调保护法。
When there are no power swings or impedance trajectory sway out the operation characteristic of distance protection the fault clearing time will not be influenced by power swing blocking. In other cases, the more fuzzy the characteristics are, the longer the three phase fault clearing time will be. In the most disadvantageous situation the three phase fault clearing time is 0.4s.
利用三相故障发生、发展过程中所显现出来的一系列特征，快速识别振荡闭锁状态中的绝大多数三相对称故障，按照本文所提出的识别方法，在系统没有振荡（绝大部分振荡闭锁都属于这种情况）以及振荡轨迹摆到高频距离停信区以外故障时，保护的动作时间不受振荡闭锁的影响。
Antisepsis of cathodic protection with Zn as sacrifice anode to X70 steel in weak acidic solution with H2S was studied by means of static weight loss method and scanning electron microscope. And inhibitive effect of 4-hydroxy-2-mercapto-6-methyl-primidine to the corrosion of X70 steel under the same condition was investigated by means of electrochemical impedance spectroscopy and potentiodynamic polarization curves.
用静态失重法结合扫描电镜研究了以Zn为牺牲阳极的阴极保护法对X70钢在含H2S酸性溶液中的防腐作用，并采用交流阻抗法和动电位扫描法研究了6甲基-2巯基-4羟基嘧啶对X70钢在含H2S酸性溶液中的缓蚀作用。
A new type of definite impedance relay applicable to the protection of power transmission systems is described. Its operation is based upon a differential balance, under normal conditions, between the output from Hall effect in a semiconductor element and a rectifier unit.
介绍了一种新型的应用于保护电能传输系统的全电阻继电器：基于非线性平衡原理，在正常状态下，在输出之前加上一个半导体霍尔元件和一个整流器。
A novel fault component comprehensive impedance based transformer protection principle is proposed in this paper.
提出了一种基于故障分量综合阻抗的变压器保护新原理。
Impedance locus with fault resistance seen by the protection in different system conditions is analyzed in this paper.
正向经过渡电阻故障时，距离保护测量阻抗随着过渡电阻变化的轨迹可以利用故障前保护测量到的电压、电流，经过估算得到。
In asynchronous motor protection, a method is involved to judge the running state of motor, so that the set value of overcurrent quick-break can adjusts adaptively, the variate-rate of impedance at input port is regarded as the characteristic value to judge locked rotor during the starting process, in this dissertation, SIMULINK, a dynamic simulation tool in MATLAB software, is used to establish the simulation model of the asynchronous motor starting process, and simulation results verify the correctness of the judgement criterion.
对电动机保护，本文提出了对电动机运行状态实时检测的方案，从而使电动机电流速断保护的整定值根据电动机运行状态自适应调整；本文进一步阐述了利用机端阻抗变化率作为故障特征量，实现对电动机起动过程中的堵转保护的方案；本文还利用MATLAB中的动态仿真工具SIMULINK建立了异步电动机起动过程的仿真模型，仿真结果验证了判据的正确性。
This paper discusses the ability of avoiding maximal power flow of quadrilateral impedance relay and round impedance relay in detail and puts forward the setting principle and setting method of load limiting resistor of backup distance protection.
本文对四边形和方向圆特性阻抗继电器躲线路最大潮流的能力进行了详细分析，提出了距离保护负荷限制电阻的整定原则和整定方法。
Moreover, it has function to fault phase identification and fault distance measurement. Finally this paper propose the structure diagram of adaptive distance protection based on neural network impedance relay, which describes entire logic procedure from data acquisition unit to trip unit.
最后提出基于神经网络阻抗继电器的自适应距离保护结构框图，描述从信号采集单元到动作出口单元的整个逻辑过程，并对自适应距离保护的前景作出展望。
Then, we derive the fast setting calculation algorithm based on the branch additional method as the fast compensation and optimization algorithm of the impedance matrix, and then apply the generated protection setting value to the power system protection.
然后导出基于支路追加法的快速整定计算算法作为阻抗矩阵快速补偿优化算法，并将生成的保护定值用于电力系统继电保护中。
Principle of T-type transmission line pilot protection based on fault component comprehensive impedance
基于故障分量综合阻抗的T接线路纵联保护新原理
The distance protection function is divided into signal measurement module, start module, fault phase selector module, impedance relay module and oscillation blocking module. Distance protection carries out the measuring impedance, which has operating characteristics of Polygon.
将距离保护功能划分为信号测量模块、启动模块、故障选相模块、阻抗继电器模块和振荡闭锁模块等部分，开发了多边形动作特性的测量阻抗式距离元件的虚拟保护实验系统。
The adaptive current protection can automatically calculate the setting values based on the fault type and the system impedance, so it can extend the protection and bring the selection criteria down.
其保护定值由当前的系统运行方式和故障状态决定，大大扩大了保护范围，且降低了保护最低选用条件。