1) negative current
负电流
1.
Discussion the negative current in the Franck-Hertz experiment;
负电流的来源——夫兰克-赫兹实验思考
2) load current
负载电流
1.
Single-phase parallel hybrid active power filter adopting novel control approach of load current detection;
采用负载电流检测控制方式的单相并联混合型有源电力滤波器
2.
The principium of hot rolling bar shear controlled by T400,and the effect of speed set-point characteristic to load current are analyzed.
针对热轧棒材倍尺飞剪高速剪切时存在速度滞后并超调,影响产品质量,制约生产线运行速度的问题,对采用T400工艺板控制的热轧棒材倍尺飞剪,从原理上解析速度给定曲线对负载电流的影响,以参数化编程的方式实现控制方案优化。
3.
The analysis and Matlab simulation results show that the proposed controller greatly improves the dy- namic behavior of buck converter caused by fast variation of input voltage and/or load current,features clear physical meaning and easy design.
针对Buck变换器快速动态响应的要求,本文提出了一种具有快速动态响应速度的非线性控制方法——根据负载电流调节的电感电流滞环控制。
3) negative sequence current
负序电流
1.
Design and application of generator negative sequence current monitoring instrument;
发电机负序电流监测仪的设计与实现
2.
Much more attention is paid to the analysis of the method how to define the characteristic curves of phase sensitive symmetrical short circuit protection, the design of negative sequence current filter and the definition of the mathematical model of overload.
重点介绍了对称短路相敏保护特性曲线的确定方法 ,设计了负序电流滤波器 ,建立了过负荷保护的数学模型 。
3.
Aiming to characteristic of 3-phase to 2-phase power supply based on balance transformer, a new current balance compensation method utilizing inverter is proposed, which is mainly used to compensate negative sequence current.
从而使平衡变压器两相侧的输出电流对称,消除平衡变压器三相侧产生负序电流的条件,达到三相电流对称的目的。
4) load current
负荷电流
1.
State estimation method of distribution network based on load current takes load current as state variable, the branch measurement function is represented with load current, and the state estimation value of branch current can be obtained, which reduces the solution space of state estimation problem and raises the convergence of algorithm and calculation speed.
基于负荷电流的配电网状态估计方法以负荷电流为状态变量,将支路测量函数用负荷电流表示,利用三相潮流计算方法得到支路电流的状态估计值,从而降低了状态估计问题的求解空间,提高了算法的收敛性和计算速度,通过将该算法与三相潮流计算法比较,结果表明状态估计算法在效果、速度、收敛性方面都较常规方法优越。
2.
The reliability and sensitivity of the present adaptive current protection is dropped under phase-to-phase fault due to the existence of load current in non-valid grounded power systems.
针对配电网电流保护的特点,提出了一种彻底消除配电网中负荷电流对保护灵敏度影响的算法,根据存在负荷电流的情况建立动作判据,将考虑负荷电流影响时的两相短路电流归算为同一点三相短路电流,然后再与定值作比较,从而克服了目前的电流保护普遍存在的由于受负荷电流的影响而使保护在两相故障时灵敏度降低的缺陷。
3.
Here introducing the way that when the bus energral to use the load current to simulate the busbar fault so as to check the problem of circuit and to correct and solve it.
介绍了在母线不停电情况下,利用负荷电流模拟母线故障检查保护回路存在的问题。
5) negative current
负序电流
1.
Analysis of negative current in switching tests for load tap on-load tap-changers of transformers;
变压器有载分接开关切换试验中负序电流分析
2.
Analysis of the operation of the generator negative current protection impacted on by the electric railway loading
电气化铁路负序电流对发电机负序过流保护的影响
3.
According to the frequency excursion in power systems, this paper proposes a detecting method of harmonic negative current instructions.
针对电网出现的频率偏差 ,提出一种谐波负序电流指令的检测方法。
6) negative-sequence current
负序电流
1.
Electric railways have witnessed great development in Chinese railway system;however,the serious negative-sequence current,harmonics,reactive power and load fluctuation during the running process influence the electric power quality.
电气化铁道在全国铁道系统中都有了很大的发展,然而运行中易产生严重的负序电流、谐波、无功及负荷波动,对电能质量有一定程度的影响。
2.
The running state of three-phase asynchronous motor is monitored by negative-sequence current method and zero-sequence current method.
利用负序电流法和零序电流法监测三相异步电动机的运行状态,并设计电动机保护电路和PLC的控制梯形图,用FX系列PLC进行故障类型判别和报警处理,设计方案原理简单、工作可靠。
3.
The harm of negative-sequence current produced by electric train is analyzed.
介绍了沪杭电气化铁道工程的简况以及电气化列车运行时输出的负序电流的危害。
补充资料：负电性气体击穿
负电性气体击穿
breakdown in electronegative gases
fud旧nx旧gq}t{}}ch日。n负电性气体击穿(breakdown in eleetrone-gative gases)在电场作用下，负电性气体由绝缘状态突变为良导电状态的过程。容易吸附电子而形成负离子的气体称为负电性气体。含卤族元素(如F、Cl、Br、D的一些气体是负电性很强的气体。 高电气强度负电性气体的击穿可以用汤森放电理论或流注放电理论解释。工程上使用的是气压大于。.IMPa的负电性气体，这种情况下的击穿过程需用流注放电理论解释。与空气相比，负电性气体的击穿电场强度较高。例如，均匀电场中气压为0.IMPa的SF6的击穿场强约为空气击穿场强的3倍，而其他一些负电性气体的击穿场强还大于或略低于SF。。由于负电性气体的击穿电场强度较高(见表)，所以它们也被称为高电气强度气体。 卤化物气体具有高电气强度的原因是:①这些气体有很强的负电性，气体分子容易吸附电子而形成负离子，减少了自由电子;②这些气体的分子直径大，电子在其中的自由行程短，不易积聚能量，减弱了电子的默蔽丫{霎罢夏)拿鹭缪￡纂，猫局一小乃F」当氛一些负电性气体的击穿特性┌────┬──────────────┬──────┐│气体 │f里{/厂f二)刁 │ (Ph)。r， ││ │、尸夕。·it/L戈I’)二t Jsr6│(MPa.科m) ││ │ (气压为0.IMPa时) │ │├────┼──────────────┼──────┤│CZC12F4 │1 .71 │3 ││CBrCIFZ │1 .52 │5 ││CZCIFS │1 .17 │7 ││CC12FZ │1 04 │10 ││ C3F。 │1 .03 │13 ││ SF。 │ 1 │6 ││ C3FS │0 .97 │7 ││ CZF6 │0 .78 │9 │└────┴──────────────┴──────┘碰撞电离能力;③电子和这些气体分子相遇时，易使分子发生极化等过程，能量损失增加，也减弱了电子的碰撞电离能力。 临界(场强/气压)值气体的电子碰撞电离系数a与电子附着系数甲之差称为电子有效碰撞电离系数石。石随电场强度E与气体压力p之比E/P而变。使五一。的E/P值称为临界(场强/气压)值(E/P)cr;，。(E/P)crit是气体击穿的重要特性之一，仅当(E/P)>(E/P)cri，时，石>0，电子崩才会发展而导致击穿。空气的(E/P)cr;t一24、4kV/(mm·MPa)，SF6的(E/P)。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条