1) sequence currents
三序电流
2) zero sequence current
零序电流
1.
The paper Presents the principle of selective leakage protection based on zero sequence current direction.
文中阐述了基于零序电流方向选择性漏电保护的工作原理,介绍了以单片机80C196KB为核心,通过相敏整流的方法来判断零序电流方向的实施方案,具有抗干扰性能好,实施电路简单的优点。
2.
This paper analyzes the basic principle of Sel587 differential protection device and elaborates the influence of zero sequence current .
分析SEL587差动保护装置的基本原理,阐述零序电流的影响。
3.
In order to reduce influences of varieties of operation conditions of power systems and differences of grounded fault type on the protecting range of the instantaneous zero sequence current protections of transmission lines,a feasible method for realizing the adaptive instantaneous zero sequence current protections was put forward.
为了尽可能减小线路零序电流速断保护的保护范围受系统运行方式变化等因素的影响,提出了一种自适应零序电流速断保护的实现方法。
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) zero-sequence current
零序电流
1.
Comparative analysis on zero-sequence current of Y,y_(no) and D,y_(n11) transformers;
Y,y_(n0)型与D,y_(n11)型配电变压器零序电流比较分析
2.
Analysis of transient process of zero-sequence current during single-phase reclosure;
单相重合闸过程中的零序电流暂态过程分析
3.
Polarity check of zero-sequence current and voltage based on microcomputer protection;
基于微机保护的零序电压与零序电流的极性判定
5) zero order current
零序电流
1.
Starting with the traits of zero order impedance and the relationship between zero order current and zero order impedance,analyzes the main differences of electric traits of power cables and aerial lines and the disadvantages of applying power cables into the traditional grounded protection.
从正、负、零序阻抗特性以及零序阻抗与零序电流的关系入手,分析了架空线路与电力电缆电气特性的主要区别及传统接地保护应用于电力电缆线路所带来的弊端。
2.
On the basis of analyzing the law of variation of the zero order current, the zero order voltage and the zero order power in the isolated neutral system, a synthetic criteria principle of selecting the grounded fault line according to three criterias at the same time was put forward.
在对中性点不接地系统单相接地故障情况下零序电流、零序电压以及零序功率的变化规律做了认真分析的基础上,提出了采用3个判据同时判断的故障选线三合一综合判据原理,这个综合判据可以大大提高接地选线的准确率,具有一定的推广利用价值。
6) 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。
补充资料：交流电气化铁路的负序电流和负序电压
交流电气化铁路的负序电流和负序电压
the negative sequence current and voltage produced by AC elec-tric railway
处为最大，随着负序电流逐渐分散进人电力系统，系统各处的负序电压水平将逐渐下降。YN，d一l:v.v:单相平衡接线11:重臂负荷I]l=轻价负荷月=111/11两，负荷功率因教相同0。250。5751。0 图2不同接线牵引变电所的负序电流系数 允许标准不同类型发电机的负序承受能力不同，为此，首先应根据有关电机制造标准，选择允许的负序标准。在缺少电机制造标准规定时，可参照以下规定:当汽轮发电机在额定工况连续运行时，三相电流差不应超过10%，水轮发电机三相电流差不应超过20%;有关电力系统公共连接点的三相电压不平衡度，中国国家标准规定:“正常的电压不平衡度允许值为2%，短时不得超过4%”。 改善措施主要有: (1)对电气化铁路各牵引变电所实行进线相序轮换，减少电气化区段的综合负序。 (2)采用平衡接线变压器，常用的接线型式有斯科特、列布兰、变形伍德布里奇等方式。 (3)在受负序电流影响最大的电力系统分支回路中加装电抗器，以限制进人该支路的负序电流。i旧01一u dlanqihua tielu de fuxud一anl旧he fuxud一onya交流电气化铁路的负序电流和负序电压(thenegative Sequenee eurrent and voltage produeedby AC eleetrie railway)交流电气化铁路的单相牵引负荷会造成电力牵引变电所一次侧三相负荷电流不平衡，任一三相不平衡系统均可用对称分量法分解成正序、负序和零序三组对称分t的盈加，从而在电力系统中产生负序电流和负序电压.接人电力系统线电压间的单相负荷不产生零序分量，只有正序和负序分t。负序电流、负序电压的有害影响有: (l)可在同步发电机转子中产生附加损耗和局部发热，造成系统出力下降， (2)负序电流产生的负序转矩，使发电机振动，影响安全运行; (3)增大系统中各翰电环节的损耗; (4)负序电压的存在对系统中三相电动机用户产生不利影响，造成电动机三相电流不对称和附加损耗，使出力下降并危及电动机安全。 牵引变电所的负序电流电力牵引变电所负序电流取决于两供电臂负荷的相位和幅值，因此可以把牵引变电所看作是一个负序电流源. 图1示出变压器为YN，dll接线的三相牵引变电所在两份用电功率因数相同时的负序电流相盆图.图1的上方为臂电流和变压器二次绕组的三相电流相量;中间为正序电流相量;下方为负序电流相t.不同供电臂产生的负序电流有1200相位差。
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