zero sequence

Key words: low current earth electrical network, transient earth fault, zero-sequence energy, energy variation.

关键词: 小电流接地电网, 间歇性电弧接地故障, 零序能量, 能量变化.

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Abstract: Zero sequence directional power protection is widely used in neutral directly grounded system.

文摘: 在大电流接地系统中广泛采用着零序功率方向保护.

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When the zero sequence voltage is below the threshold, this element adopts the recorded voltage of the faulted-phase to replace the zero sequence voltage, and then determine the zero sequence power direction. The simulations use recorded fault data show that this element is correct and reliable.

当零序电压低于门槛值时，依据选相结果，该元件采用保护安装处故障前的故障相电压代替零序电压，进行零序功率方向判别。

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In view of the distribution of different frequency in terms of phase-frequency characteristic, the polarity of zero sequence transient current in fault line is demonstrated to be opposite to those in healthy feeders in the selected frequency band ( SFB).

根据线路的相频特性将频率分为不同的区段，论证了在选定频段（SFB）内，小电流接地系统健全线路零序电流极性与故障线路相反；

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Study on Zero sequence Reactance Relay

零序电抗继电器的研究

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For an ungrounded neutral low voltage power system in mine, its insulance ( r), capacitance ( C) and leakage resistance ( R) to the ground are three important parameters in determining the zero sequence voltage.

对于中性点不接地的矿井低压电网，其对地绝缘电阻r，电容C和漏电电阻R，是决定零序电压的3个重要参数。

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The equations of zero-sequence coupling transmission lines are derived from telegraph equations.

运用电报方程推导出 零序 耦合传输线的输线方程.

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This paper carried on the detailed analysis of many algorithm including three-step current protection algorithm 、 inverse time zero sequence current protection algorithm and voltage protection algorithm, and gave the DSP programming flow chart.

并对包括三段式电流保护、反时限零序电流保护、电压保护等算法详细分析，给出了在实现DSP编程中流程图。

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No-balance method for zero sequence current of double lines are introduced in detail.

详细介绍了双回线零序电流的不平衡解决方法.

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According to the data of the zero sequence pulse position, judge the starting and the ending point, establishing the pulse timing sequence, and then gave the data to analysis and process in the standard of d processing software of data. 3.

根据数据过零点的位置判断时序脉冲的起始和终止点，建立脉冲时序序列，然后把所得数据在标准数据分析处理软件中进行数据分析和处理。

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These reactive devices can't suppress the zero-sequence and negative-sequence current resulted from the unbalanced load.

而且不能补偿不平衡负载导致的 零序 、负序和中线电流.

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Basic Analysis on U_0 and I_0 Polarity Relation of Zero Sequence Direction Power Components

浅析零序功率方向元件U0和I0极性关系

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This paper studies the influence of converter transformer-zero sequence current on valve short circuit protection.

笔者研究了 换流 阀三角形侧零序环流对阀短路保护误动作的影响.

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Also interference with telephone circuit is reduced because of the absence of zero-sequence currents .

由于无 零序电流,对电话线路干扰的影响也降低.

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This paper discusses the applicability of V-V connection, zero sequence current protection and Y 0/ Y 0/ connection respectively.

本文对V-V接线、零序电流保护和Yo/Yo/接线各自的适用范围进行了探讨。

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The voltage regulation characteristic of autotransformer, external compensation of zero sequence current for three Y au.

论证自耦变压器的电压调整性能 、 三Y型 自耦变压器的零序电流外补偿、自耦变压器继电保护整定的特殊问题.

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Secondly, the approach that switches the tripping equations to improve the tolerance of grounding resistance is not suitable when the zero sequence reactance relay is applied to double circuit lines or ring network.

零序电抗继电器应用于双回线或环网时，不适宜用切换动作方程的方法提高承受过渡电阻的能力。

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It mainly focuses on analysis and determining method of zero sequence power direction relay.

重点介绍零序功率方向继电器的分析及判定方法.

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Similarly, fault areas of single-phase ground circuit could be identified by detecting grounding points at the power source and variation of zero sequence admittance value acquired both at ovt cir first time and at the second time.

同理，通过检测第一时间、第二时间接地点电源侧和负荷侧零序导纳值变化，可以确定发生单相接地线路上故障区段。

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A directional phase-selective element cooperated with the zero sequence reactance relay

配合于零序电抗继电器的方向性选相元件

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In order to control the positive sequence, negative sequence and zero sequence components independently, the last two control strategies based on bisynchronous coordinates are introduced.

为了实现对正序、负序和零序分量的独立控制，本文还采用了两种基于双同步旋转坐标变换的控制策略。

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In order to greatly enhance the zero-sequence current active component during the single-phase ground fault, the short-time switch and the resistance paralleled with the petersen coil were controlled when there is a permanent single-phase ground fault in the system.

该方法当系统发生永久性单相接地故障时通过控制开关短时投切与消弧线圈并联的电阻，从而大大增强单相接地故障时的零序电流有功分量。

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The zero sequence component and the positive sequence component equations of transmission lines are derived on the basis of telegraph equations.

运用电报方程推导出三线－地耦合传输线零序分量和正序分量传输线方程。

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Furthermore, we considered phasor dynamics of values of negative sequence and zero sequence. Analysis of Unbalance Three-phase Circuit and a Practical Circuit for Judging Phase Sequence

对于发电机的负序和零序，采用了等值的电路模型并考虑了其中电压和电流的相量动态。一种相序判定方法分析及其实用电路

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Aiming at CDMA communication system, spreading sequence has perfect correlation properties only within the bound of synchronized error, Low/ Zero correlation zone ( LCZ/ ZCZ) was proposed.

针对准同步CDMA通信系统，只要求扩频序列在同步误差范围内（一个或几个码片周期）具有和接近理想相关特性，提出了低/零相关区。

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It can also used for zero-sequence current measurement and single phase ground protection.

也可用于电缆线路 零序电流 测量和单相接地保护.

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Study of Making Zero Sequence Current in Distribution Networks with Two Phases Current Transformers; When the galvanometer reads zero the circuit is in the null-balance position.

两相TA配电网零序电流构造方法研究当检流计的读数为零时，电路处于零平衡位置。

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A novel principle of negative-sequence current compensation based adaptive zero-sequence over-voltage protection is therefore proposed.

该文提出一种新的基于负序电流补偿的自适应 零序 过电压保护原理.

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A double lines distance relay based on the zero sequence components is presented.

提出了适用于平行双回线路的零序距离继电器新判据.

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Combining with zero sequence current with inverse time characteristics, grounding distance relay is used in earth protection for 220 kV and above lines, instead of phase zero sequence current protection.

在220kV及以上电压等级线路用接地距离保护代替阶段式零序电流保护，并辅之以具有反时限特性的零序电流作为接地保护。

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