For the difference of bus voltage, the closing loop operation of distribution network will generate large loop current and impact current, which would affects the safety. 由于合环开关两侧母线电压存在电压幅值、相位差等原因,使合环操作中产生过大环流,引起过流保护或速断保护误动。
Calculation of the loop closing steady-state current in radial power distribution network 辐射型配电网合环稳态电流计算方法研究
Breaking and closing ring closure current of load switch, charging current of non-load transformer and cable, composite apparatus can break till any current of rated short circuit current. 负荷开磁分合仙、闭环电流、空载变压器和电缆充电电流,组合电器可以开断直至额定短路电流的任何电流。
At the Closing Ceremonies, the mayor of the current Olympic host city presents the flag to the mayor of the next host city. 在闭幕典礼上,当次奥运主办城市的市长会把会旗呈现给下个主办城市的市长。
Allows you to assign your own shorcut to closing the current tab. 你可以自订关闭目前分页的热键。
In order to transfer energy from the charged capacitor to EM coil launcher in a short time interval, a special closing switch is used to handle high voltage and heavy current. 电磁线圈发射器工作需要能承受很高工作电压和很大工作电流的闭合开关,这些开关目前主要有半导体开关和间隙类开关。
The influence of remnant flux and closing angle to inrush current is discussed in this paper. 针对励磁涌流的仿真,讨论了剩磁和合闸角对于励磁涌流的影响。
The proposed FCL topology is of simple structure and fast response, and further, the transfer switch is simply to complete a fast closing operation without additional requirement of its current breaking capacity, and therefore convenient design and low cost can be achieved. 该故障限流器拓扑结构简单、响应速度快,其中的快速开关只进行快速合闸操作,不需要具备电流开断能力,易设计,造价低廉。
The equipment ensures automatic closing at current zero, preset test voltage automatically and the effect is fine. 设备自动保证过电流零点合闸,自动预置试验电压,试验效果好。
The indexes of various functions ( the result of the sealing and closing water current of valve slice of surge valve, the starting and shutting and fixed position of the valve slice, etc) were all satisfied with the function request of surge irrigating equipment. 波涌阀阀片的密闭止水效果、阀片的启闭定位等各项性能指标均满足波涌灌溉设备的性能要求,该设备具有较高的实用性和可操作性。
The calculation of loaded closing striking current of capacity and opening filter capacity bank voltage is illustrated by a few examples. 本文介绍电容器负载合闸冲击电流和分闸滤波电容器组电压的计算,并通过实例加以说明。
The text not only analyses the relations between two usual ways that calculate constant magnetic field energy in general physics books, but also gives the other way to calculate magnetic field energy which distribute in closing current with the formula about magnetic energy in electric current coil. 本文分析了普物教科书中稳恒磁场能量常用的两种计算方法之间的关系,给出了闭合体分布电流磁场磁能的另一种计算方法。
Analysis and Control of the Loop Closing Current Based on Power Flow Calculation in Distribution Network 基于配网潮流的合环电流分析与控制
This paper presents some detective techniques without disassembly for SF6 circuit breaker, namely, dynamic circuit resistance detection, mechanic vibration detection, opening and closing speed-time characteristic measurement, and current waveform of magnet coil detection. 介绍了SF6断路器不拆卸检测技术中的动态电阻,机械振动,合分电磁铁线圈电流及合分速度曲线等四种检测方法。
Research on Closing Capabilities of Air Curtain Affected by Lateral Air Current 横向气流作用下气幕封闭特性的理论研究
In order to solve the design problem of larger opening and closing start electric current and unsatisfied opening speed of permanent magnetic actuator with long stroke, the concept of four coil double steady state permanent magnetic actuator is suggested firstly in this paper. 为了解决大行程永磁操作机构设计时出现的分、合闸始动电流过大及刚分速度不满足要求的问题,本文首次提出了四线圈双稳态永磁操作机构的概念。
According to these parameters, the maximum closing circuit current and its effect of electromagnetic disturbance and also its effect of electric forces could be analyzed in detail; 根据这些参数,一方面能推断出合闸过程中电流最大值,了解电磁干扰和电动力破坏的程度;
Besides the economic effect, the another greater important reason is that the validity of synthetic making test has brought higher requirements to the closing devices of current source and time precision of control system. 除了经济性方面的原因外,更重要的是合成关合试验的有效性对电流源的合闸设备、时间控制精度等提出了更高的要求。
The examples given in this paper also indicate that loop closing current can be reduced by means of changing capacitance of capacitors and adjusting the transformer taps to regulate power flow, so distribution system can be assured of running more safely and stably. 所给出的实例表明,通过改变电容器的投入容量,调整变压器分接头的方式进行潮流调整,可以减小合环电流,确保配电网更安全可靠的运行。
It adopts Electronic switch being composed of IGBT to control the opening/ closing coil current. 采用以IGBT为主组成的电子开关通断合/分闸线圈电流。
By a detailed analysis of the closing loop power flow, adjust the power flow and find the factors affecting the closing loop current. By adjusting the closing loop power flow thus changing the closing loop current, achieve the purpose of safety co-rings. 通过对合环潮流进行详细的分析,电容器补偿和变压器分接头来实现潮流调整,找到影响合环电流的因素,通过调整合环潮流从而改变合环电流,达到安全合环的目的。
As the loop closing operation will generate steady-state current and impulse current, that if the current is too large may has a bad effect on power system security. 由于合环操作时对系统将会产生稳态电流及冲击电流,如果电流过大有可能会影响到系统的安全。
The paper establishes the transformer numerical simulation and dynamic model to simulate the power transformer no-load closing and records the voltage and current data. 建立变压器数字仿真和动模仿真模型,仿真了电力变压器的空载合闸,并记录了电压、电流数据。
Low-voltage circuit breaker is an important control and protection apparatus for closing, carrying and breaking the normal operating current, overload current and short circuit current in the field of low voltage distribution network. 低压断路器是低压配电网中一种重要的控制与保护电器,用来关合、承载、开断运行回路的正常工作电流、过载电流和短路电流。
As the content of this research to explore, to finding grab the opening and closing current and since the relationship between the weight, research methods and the development of the port modernization. 本课题研究的内容作为一次探索,寻找到抓斗的开闭电流和起升重量之间的关系,为港口技术的现代化发展提供了研究方法和借鉴。
The article closing with the current situation and character of the 21 th. On this basis, it proposes future trend of graphic design. 最后论述总结了21世纪初平面设计发展的现状和特点,并在此基础上,提出了平面设计未来发展的趋势预测。
The AC was commuted and filtered, then providing for the closing coil excitation current; Charge to the capacitor to prepare the necessary tripping coil excitation current. 交流电经整流滤波后,为合闸线圈提供励磁电流;对电容器充电,以备分闸线圈提供所需励磁电流使用。
As a result of core saturation during no-load closing, inrush current happened in the winding whose amplitude is several times of rated current has a tremendous impact on equipment safety and protection actuating. 在其空载合闸时可能会因铁心的饱和,绕组内出现额定电流若干倍大小的励磁涌流,对系统运行、设备安全和保护动作都会产生极大的影响。