配电网馈线故障指示器检测平台设计分析

配电网馈线故障指示器能够快速实现故障位置的精准确定,对配电网络的发展具有重要意义和价值.文章详细分析配电网馈线故障指示器检测平台的设计,根据相关规范,详细探索检测平台的设计方案,分析检测平台各个组成元件的基本功能,根据实验原理,以3种配置方案进行设计和分析,并将3种设计方案进行对比和研究,探索配电网馈线故障指示器检测平...     

在线录波故障指示器应用与分析

近年来,配网故障指示器大量应用于中压线路中,它投资小、见效快、安装不需停电,能够有效协助运维人员提升快速复电效率。本文介绍了在线录波故障指示器的系统组成、原理及应用情况,录波故障指示器相对于传统的故障指示器更加高效、准确,减少了停电时间,提高供电可靠性。     

有关配电线路故障指示器选型技术的分析

本文所描述配电线路故障指示器均具备配电线路相间短路故障检测和单相接地故障检测的能力,本文从几个角度对配电线路故障指示器选型技术进行分析,旨在实现配网故障的准确检测和快速定位.     

故障指示器在福建山区配电网中应用探讨

通过调研福建省山区配电自动化故障指示器的配置情况、产品分布情况及应用成效等几个方面,发现故障指示器在采购、安装及运行维护过程中存在的问题,并提出相应的解决措施和建议.     

一种配电网单相接地故障解决方法

本文针对配电网系统单相接地故障检测困难的原因进行了分析,进而对比分析了注入信号法和零序电流检测法这两种单相接地故障的解决方式.本文从检测的原理和缺陷到应用于故障指示器的方式对零序电流检测法进行了系统的阐述,并根据这些缺陷开发引入了新的技术,这些新技术成功解决了零序电流检测法中的零序电流获取困难,零序电流精度低等重大问题.零序电流检测法问题的解决提升了故障指示器的可靠性和准确性,通过在秦皇岛的试点成功案例,可以看出这种故障指示器能够有效地解决单相接地故障问题,为我国配电网自动化的建设做出贡献.     

应用于配电网单相接地在线故障指示器电源

配电网单向接地故障指示器在配电网自动化方面应用广泛,但其在线故障诊断所需的能量不能靠低压侧供给,只能在高压端获取,因此文中设计了特殊的取电电路和控制电路,根据故障指示器各个元器件的需求,此取能电源可以为故障指示器提供5V、-4V和3．2V3路电压,以满足故障指示器信号采集和处理以及无线通信的需要。整机实验结果表明,该取能电源在15—800A的变化范围内,能提供不少于1．5W的功率,可满足故障指示器的需要。     

适用于小电流接地系统的暂态特征型故障指示器技术研究

由于故障电流小、电弧不稳定、故障指示器处理能力不够等原因,小电流接地系统的单相接地故障定位始终没有得到彻底解决。文中通过分析单相接地故障时的暂态特征,结合智能分布式馈线自动化算法,设计了一种高精度采样的新型故障指示器,在小电流接地系统中实现分布式单相接地故障定位。通过搭建模拟实际现场的仿真环境RTDS以及现场试挂等测试手段证明,该故障指示器采样精度高、故障判断准确,不受故障初相角、接地电阻、故障位置的影响,最终实现小电流接地系统中单相接地故障定位功能。     

配电线路故障指示器现状分析

如今是一个个电力的时代无处不需要电力的使用,但是巨大的、复杂的输配电线路网络中总会出现多多少少的故障问题,而电路线路出现故障常常也就表现为断路跳闸;只是出现这些故障的时候如果没有检测的设备靠人工去一点一点检查出具体的配电线路故障位置显然是不太实际的;而如今我国的配电线路故障指示器使用的现状又是怎样的,故障指示器的工作原理以及使用过程中需要注意的问题都需要我们去探讨。     

基于无线的三相同步故障指示器及其低功耗设计

本文针对目前故障指示器存在的问题,提出一种基于无线三相同步的低功耗故障指示器。阐述了故障指示器的总体设计方案,详细描述了基于无线的三相同步设计流程,并从硬件和软件相结合的角度阐述了低功耗设计方法。最后经过三相同步测试以及功耗测试证实了设计的可行性,性能指标满足国网企标以及现场应用需求,有较好的应用前景。     

一种基于故障指示器的配电主站故障定位实现方法

我国配电网线路数量多、分支多、运行方式复杂,在线路发生故障时,故障点的查找费时费力,线路维护人员的工作量大,效率低,线路故障点的准确定位能够帮助维修人员快速排除故障、恢复供电,这对于提高供电可靠性具有重要意义。本文介绍一种基于故障指示器的主站故障定位实现方法,它将故障指示器上传的故障信息进行分析,具有纠错和补漏功能,快速给出故障定位结果通知维修人员。该方法实现起来逻辑简单,成本较低,具有一定的实用性。     

智能型故障指示器在配网中的应用

随着社会发展和人们生活水平的不断提高,提高供电质量和供电可靠性是每个供电企业都面临的最实际和迫切的需求。由于县城配电网存在点多、线长、面广及接线方式复杂多变等特点,因此在线路故障时,要靠配电运行人员沿线查线,直到发现故障点,且故障查找困难,难以保障及时恢复供电。近年来,线路故障指示器在10 kV配电线路上得到了广泛应用,减轻了巡线人员的劳动强度,大大提高了工作效率,缩短了停电时间。文中介绍一种集短路、接地监测、远程通信为一体的智能型故障指示器在德清配网中的应用情况。     

基于零序电流相位法的配电网故障定位

该文根据零序电流相位法故障定位的原理,简单介绍了其定段方法。对整体系统的构成及实现进行了概述,其中零序电流的采集,主要是通过GPS秒脉冲进行同步采样,并建立了GPS时间与电流相位的关系;然后将得到的时间相位信息经无线通信模块实现数据的传输。采用零序电流相位进行故障定位,直接利用故障时产生的电流信号,避免了外加信号对系统运行的附加影响,增强了其可靠性;另外,基于MATLAB的仿真模型实验也证明了该方法的可行性。     

相位法配电网故障定位系统的仿真分析

根据零序电流相位法故障定位的原理,可以判断配电网的故障区段。文中利用Matlab/Simulink中的仿真模块,对中性点不接地系统进行仿真分析。介绍了仿真模型的搭建,对不同状况下的接地故障进行仿真分析,包括改变接地电阻的大小、线路长度以及有无负载等,总结其影响因素。仿真结果与理论推导一致,从而为其实用化奠定了基础。     

Fault Detection in Switched Current Circuits Using Built-in Transient Current Sensors

Switched current (SI) circuits use analogue memory cells as building blocks. In these cells, like in most analogue circuits, there are hard-to-detect faults with conventional test methods. A test approach based on a built-in dynamic current sensor (BIDCS), whose detection method weights the highest frequency components of the dynamic supply current of the circuit under test, makes possible the detection of these faults, taking into account the changes in the slope of the dynamic supply current induced by the fault. A study of the influence of these faults in neighbouring cells helps to minimize the number of BICS needed in SI circuits as is shown in two algorithmic analogue-to-digital converters. Yolanda Lechuga received a degree in Industrial Engineering from the University of Cantabria (Spain) in April 2000. Since then, she has been collaborating with the Microelectronics Engineering Group at the University of Cantabria, in the Electronics Technology, Systems and Automation Engineering Department. Since October 2000 she has been a post-graduate student, to be appointed as lecturer at this university, where she is working in her Ph.D. She is interested in supply current test methods, fault simulation, BIST and design for test of mixed signal integrated circuits. Román Mozuelos received a degree in Physics with electronics from the University of Cantabria, Spain. From 1991 to 1995 he was working on the development of quartz crystal oscillators. Currently, he is a Ph.D. student and an assistant teacher at the University of Cantabria in the Department of Electronics Technology. His interests include mixed-signal design and test, fault simulation, and supply current monitoring. Miguel A. Allende received his graduate degree in 1985 and Ph.D. degree in 1994, both from the University of Cantabria, Santander, Spain. In 1996, he became an Assistant Professor of Electronics Technology at the same Institution, where he is a member of the Microelectronics Engineering Group at the Electronics Technology, Systems and Automation Engineering Department in the Industrial and Telecommunication Engineering School. His research interests include design of VLSI circuits for industrial applications, test and DfT in digital VLSI communication circuits, and power supply current test of mixed, analogue and digital circuits. Mar Martínez received her graduate degree and Ph.D. from the University of Cantabria (Spain) in 1986 and 1990. She has been Assistant Professor of Electronic Technology at the University of Cantabria (Spain) since 1991. At present, she is a member of the Electronics Technology, Systems and Automation Engineering Department in the Industrial and Telecommunication Engineering School. She has participated in several EU and Spanish National Research Projects. Her main research interest is mixed, analogue and digital circuit testing, using techniques based on supply current monitoring. She is also interested in test and design for test in digital VLSI circuits. Salvador Bracho obtained his graduate degree and Ph.D. from the University of Seville (Spain) in 1967 and 1970. He was appointed Professor of Electronic Technology at the University of Cantabria (Spain) in 1973, where, at present, he is a member of the Electronics Technology, Systems and Automation Engineering Department in the Industrial and Telecommunication Engineering School. He has participated, as leader of the Microelectronics Engineering Group at the University of Cantabria, in more than twenty EU and Spanish National Research Projects. His primary research interest is in the area of test and design for test, such as full scan, partial scan or self-test techniques in digital VLSI communication circuits. He is also interested in mixed-signal, analogue and digital test, using methods based on power supply current monitoring. Another research interest is the design of analogue and digital VLSI circuits for industrial applications. Prof. Bracho is a member of the Institute of Electrical and Electronic Engineers.     

基于Forcecontrol配电监控系统的设计

针对配电网中结构复杂、位置分散、管理手段落后的问题,利用MODBUS通信协议和RS 485、RJ45接口等技术,结合现场总线控制理论,开发了一种基于Forcecontrol组态软件的低压配电智能监测系统.整个监控系统由控制室中工控机和光纤适配器组成,每个无人低压配电室由基于MODBUS-RTU通信协议的RS 485通信端口的智能控制器和光纤适配器组成.系统具有数据自动采集、动态数据和曲线显示、故障记录报警、实时通信等主要特点.     

高压电力电缆的故障测寻分析

国内在高压电力电缆故障方面仍缺乏较成熟的测寻方法,文章通过对高压电力电缆故障成因及类型的分析,着重从低压脉冲反射法、直流高压闪络法、冲闪法等方面阐述了电力电缆故障的距离检测方法,并就冲击放电声测法与声磁同步法的故障定点检测作了深入探讨.     

零功耗待机显示器的设计与实现*

为实现待机显示器的零功耗,提出采用单片机控制继电器开关输入电源并且使用显卡输出电能为待机状态显示器供电的方法.根据显卡接口输出的电量,选用低功耗规格的芯片维持待机状态所需最小能量.然后设计电源电路的继电器开关电路和显示器的输入电源切换电路,通过功率测试仪器对电路系统性能进行验证.实验结果表明,利用显卡接口输出50 mA左右的微小电量能够满足显示设备在待机下的需求,从而实现显示器输入零功耗,满足各国功率法规等要求.     

交流固态功率控制器控制技术

为了减少交流供电系统的电磁干扰,设计了一种实用的交流固态功率控制器,其采用两只反向连接的MOSFET共同作为固态功率开关器件,通过适当的开关时序控制和利用MOSFET的固有单向导电性,实现了交流固态功率控制器的过零开通关断功能。根据其原理制作了原理样机并进行了试验验证,结果表明该控制方法切实可行。该控制方法替代了现有的双向可控硅与过零检测的方法,对交流电气负载进行控制,并达到一次触发、自然过零开通和关断、无干扰、功耗低的目标。