1) sequence current
序电流
1.
Analyzing sequence current, sequence current between the transformer is unloaded to put into and is put into with interal fault is obvious different,the inrush current and the fault current can be discerned.
文章提出了基于序电流分量的识别方法,通过对励磁涌流中零负序电流分量的分析,发现在变压器空载投入和内部故障时空载投入两种情况下零负序电流值有明显的不同,从而实现对励磁涌流的识别。
2.
This paper analyzes the phase selection theories of sequence current,the current break variable and the compensation voltage.
分析了反映序电流、电流突变量和补偿电压的选相原理,提出了当电压互感器断线时为防止误动应闭锁补偿电压选相。
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：负序电流承载能力
负序电流承载能力
negative phase sequence current carrying capability
fuxu dlonl一u ehengzo一nengl-负序电流承载能j7(negative phase一sequenceeurrent carrying eapability)同步发电机能承受三相不平衡负载的负序电流标么值和时间的限额。同步发电机在故障状态下短时承受不平衡负载的能力以负序电流标么值12的平方和时间t(s)的乘积12’t表示。这是不考虑发电机转子向外散热而定的。此值也可作为整定发电机负序过电流保护的参考。连续负序电流承载能力以负序电流相当于额定定子电流IN的百分数表示，此时发电机任一相最大定子电流不能超过额定值。同步发电机在三相不平衡负载下运行时，转子表面将由定子负序电流感应出两倍工频的涡流(见旋转磁动势)，该电流通过没有电气绝缘的转子槽楔、齿部、阻尼绕组和护环构成的环路而引起局部过热;在匝数较多的励磁绕组两端也会出现两倍工频的高达20一3。倍额定励磁电压的过电压，因此负序电流应有一个限额.对同步发电机的负序电流承载能力各国的标准有不同的规定，一般的取值范围见表。同步发电机负序电流承峨能力┌──────┬─────────┬────────┐│发电机型式 │连续运行负序电流 │故障短时负序电流││ │承载能力几/I、(%) │承载能力I22t(s) │├──────┼─────────┼────────┤│凸极发电机 │12 │40 │├──────┼─────────┼────────┤│隐极发电机 │ │ │├──────┼─────────┼────────┤│转子间接冷却│10 │15~30’ │├──────┼─────────┼────────┤│转子直接冷却│5~8’. │5~10“. │└──────┴─────────┴────────┘ 中国国家标准规定:空气冷却为305，氮气冷却为155。 中国国家标准规定:300 MW及以下为8%和8s，600 MW为7%和75。几份的限额可以通过理论分析或作发电机暂态负序渔升试验求得。对直接内冷的大型发电机，为了提高负序电流承载能力，在转子端部装设阻尼环和在转子的箱楔下设t全转子长的阻尼条。除此之外，阻尼绕组还对抑制发电机的振荡和避免在系统发生次同步谐振时的负阻尼现象起有利作用。
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