Equivalent Instantaneous Impedance Based Bus-Bar Protection

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Equivalent Instantaneous Impedance Based Bus-Bar Protection

更新时间：2025-07-09

- Equivalent Instantaneous Impedance Based Bus-Bar Protection
- Vol. 44, Issue 12, Pages: 43-49(2010)
- 作者机构：
  
  西安交通大学电气工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM77
- Online First：10 December 2010，
  
  Published：2010
- 稿件说明：
移动端阅览
Equivalent Instantaneous Impedance Based Bus-Bar Protection[J]. 2010, 44(12): 43-49.
DOI：

Equivalent Instantaneous Impedance Based Bus-Bar Protection[J]. 2010, 44(12): 43-49. DOI：

摘要

利用模型参数识别的思想

提出了一种利用等效瞬时阻抗模值特征的母线保护原理.将母线故障状态等效为一个LR模型

通过对模型参数的识别以及所定义的等效瞬时阻抗模值变化特征的分析

构造了两种实用的母线保护方案

可准确判断出母线的区内、外故障状态.与传统的母线保护相比

基于新原理的母线保护在区外故障且电流互感器(TA)饱和时能够可靠制动

无需配备专门的TA饱和识别元件

保护判据简单、易整定

具有较高的灵敏度

而且保护本身对于非周期分量和各次谐波均适用

无需滤波

动作速度更快

同时还具有天然的不受3/2断路器接线的母线区内故障时汲出电流影响的特性

以及具有较强的抗过渡电阻能力.EMTP仿真结果证明了该母线保护原理的正确性和可行性.

Abstract

Following the parameter identification principle

a novel equivalent instantaneous impedance based bus-bar protection is proposed. An inductance model is developed when the internal fault occurs on the bus. Identifying the parameters of the model and analyzing the defined characteristic of the equivalent instantaneous impedance

two practical bus-bar protection criterions are put forward for distinguishing the internal fault from the external fault correctly. Compared with the traditional bus-bar protections

the current transformer saturation detection unit gets unnecessary for bus-bar protection

and the thresholds of the criterions are easy to set with high sensitivity. The new principle is suitable for non-periodic component

fundamental component and harmonic component. EMTP simulation shows the high sensitivity and reliability.

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Keywords

references

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