一类高压断路器机械特性在线监测装置的研制

本文在研究和分析了10KV级高压断路器故障原因的基础上,提出了一种针对某高压真空断路器机械特性进行在线监测装置的设计方案,通过采用位移式传感器对操动机构的运动状态进行实时检测,结合断路器的开关量输入信号,经过适当的软件处理,实现了对断路器机械特性的在线监测。     

基于真空断路器在线监测与故障诊断概述

真空断路器是电力系统中的重要设备之一,起着控制和保护双重任务,其运行状态直接影响着电力系统的运行稳定性和供电可靠性,当它发生故障或事故时会引起电网事故或扩大事故,造成相当大的经济及其它方面的损失。因此,对真空断路器进行在线监测的研究,及时发现真空断路器运行过程中存在的隐患,做到防患于未然,具有非常重要的意义。本文分析总结了目前真空断路器在线监测所涉及到的真空度监测、机械性能监测等项目的实现算法和方法,并在前人研究的基础上对其进行了完善。     

高压真空断路器智能在线监测系统的研制

设计一种基于DSP和LabVIEW的高压真空断路器智能在线监测系统.传感器与下位机构成系统现场监测模块,安装于断路器本体.下位机硬件平台以TMS320F2812型DSP为核心实现断路器行程、分合闸电流和振动等信号的采集和处理,并通过CAN总线将数据传送至上位机(采用LabVIEW软件),从而实现数据的存储和显示.     

真空断路器在线监测系统研究

真空断路器在中压(10-35k V)配电系统中有非常广泛的应用;真空断路器导致的各种故障对电力系统的安全运行具有重要影响,为了提高电力系统的稳定性、可靠性,降低运行维护费用,真空断路器的在线监测系统的研制和使用得到了电力运行和管理部门的高度重视。本文在分析中压真空断路器在线监测需求基础上,提出了一种通用的中压真空断路器在线监测系统设计框架,并详细介绍了实现断路器在线监测过程中需要解决的若干软、硬件设计过程中的关键技术问题。根据本文技术方案研制的在线监测系统在多个产品上已经成功应用,功能完善、性能良好、可靠性高。     

基于分合闸线圈信号的断路器状态在线监测系统设计

针对目前高压断路器在线监测技术的研究现状和不足,提出了一种基于分合闸线圈电流信号的高压断路器状态在线监测系统。设计了构成系统的硬件电路和在线监测软件,该系统能够快速实现对实时数据的采集、转换、滤波、放大和分析,能够计算分合时间、分合速度、开关行程、分合行程、过冲距离等参数,能够对高压断路器的动作类型进行基本的判断,监测结果能在上位机监控界面上显示。实验和实际运行结果表明该系统具有实时性好、监测数据全面、可靠性高和抗干扰能力强等优点。     

高压断路器机械状态监测系统研究

描述了利用单片机实现高压断路器机械状态在线监测的智能装置及其考虑的监测因素。此智能装置可以长期在线监测高压断路器动作过程中的机械参量,为断路器机械故障诊断和状态预测提供依据。     

一种质谱仪真空测量系统的研制

本文介绍了一种基于STM32微控制器的质谱仪的真空测量系统。此系统由真空规、离子泵电源、信号调理电路、通讯接口和软件组成,兼容分子泵和离子泵两种真空平台,具有较高的集成度,紧凑的体积和较低的功耗。测试结果证实了所设计的真空测量系统能够实时、准确地监测质谱仪真空度,在满足仪器正常使用需求的同时,也提高了仪器的可靠性。     

中高压断路器在线监测装置的设计与实现

为了对开关设备的重要参数能进行长期连续的监测,设计出一种采用DSP处理器加CPLD结构的在线监测系统,详细分析了行程信号采集、线圈电流信号采集、数据存储、通信和实时RTC等主要硬件模块的设计方案。系统实现了对高压断路器状态的在线监测和机械故障的诊断,为开关设备状态监测提供了一种可行的解决方案。     

高压真空断路器智能在线监测系统的研制

设计一种基于DSP和LabVIEW的高压真空断路器智能在线监测系统。传感器与下位机构成系统现场监测模块,安装于断路器本体。下位机硬件平台以TMS320F2812型DSP为核心实现断路器行程、分合闸电流和振动等信号的采集和处理,并通过CAN总线将数据传送至上位机（采用LabVIEW软件）,从而实现数据的存储和显示。     

基于ARM的高压断路器在线监测系统的研究

设计了一种基于ARM的高压真空断路器的智能在线监测系统。传感器与下位机构成系统现场检测模块,安装于断路器本体。下位机硬件平台采用ARM处理器LPC2214,实现断路器行程、分合闸电流和振动等信号的采集和处理,并通过CAN总线将数据通过网络传送到上位机,从而实现数据的存储、显示和报警等功能。     

真空热压机真空能力改善

针对真空热压机真空度不良问题进行了分析,并依据分析结果进行改良,彻底解决了压机真空值波动带来的产品品质隐患问题。     

Triggered vacuum gaps

Characteristics of a sealed vacuum gap are described and the difficulties encountered in applying this gap as an overvoltage protection device are discussed. It is shown how these difficulties can be ameliorated by the use of gas-free electrode materials and by triggering the gap when breakdown is required. Several methods of triggering are discussed and some practical triggering devices are described that inject minute quantities of ionized hydrogen into the gap. The hydrogen is eventually recovered by the use of a titanium hydride getter. It is shown that breakdown of the gap can be accomplished in less than one-tenth microsecond by first producing a glow discharge that is rapidly transformed into a metal-vapor arc. Properties of the metal-vapor arc are described which have an effect on the characteristics of the vacuum gap. A number of practical sealed-off triggered vacuum gaps are illustrated. These are used to carry microsecond capacitor discharge currents and 60-cycle power line currents for ½ cycle. The operating voltage range is from a few hundred volts to 100 kV. The advantages of vacuum gaps over gas-filled gaps are given and a number of overvoltage protection and switching applications are listed.     

MEMS封装中真空封口及真空度检测技术

通过对MEMS封装技术进行研究攻关，突破了针对微机械陀螺仪器件性能发挥所需的真空封口技术及真空度检测技术，使器件品质因数提高将近10倍。     

Measurement of high vacuum

A new logarithmic unit of vacuum is proposed to replace the torr or mmHg, with distinct advantages to workers in the electron tube industry and in vacuum physics.     

MEMS封装中真空封口及真空度检测技术

通过对MEMS封装技术进行研究攻关 ,突破了针对微机械陀螺仪器件性能发挥所需的真空封口技术及真空度检测技术 ,使器件品质因数提高将近 10倍     

Electrical breakdown in vacuum

Theories and experimental facts of vacuum breakdown are reviewed. Measurements with gap spacings of 0.015 inch indicate little or no variation of breakdown with tube pressure between approximately 10^-5and 10^-7torr and with frequency of the applied voltage from 0 to 6 Mc/s. Variation of electrode materials, geometry, and surface preparations provide no marked improvements, but high voltage aging or conditioning does improve the breakdown characteristics by a factor of as much as 2 to 1. Enhanced field emission, from whisker-like protrusions on the cathode surface, causes individual beams of field-emission prebreakdown current to flow from cathode to anode. This prebreakdown current can cause resistive heating of the protrusion and localized electron-bombardment anode heating both of which produce vaporization and destructive effects which could lead to breakdown.     

Constant-temperature integrated vacuum sensor

An integrated vacuum sensor based on heat transfer at a constant chip temperature (CCT) is introduced. It consists of a temperature-sensing stage, a CMOS op-amp and a heating branch circuit. All three part are integrated on one chip and connected to form a negative feedback loop for CCT operation. The heating power of the sensor chip was used to indicate the vacuum which affects the heat transfer between the chip and the vacuum ambient     

Multiple-electrode triggered vacuum gaps

Since the design criteria for reliable operation of a single gap at 300 kV are not well known, multiple-electrode triggered vacuum gaps were constructed. A six-gap structure was initially studied. It had excessive time delay in the initiation of the arc. Subsequently, a three-gap structure was built. Time delays in initiation of the arc were satisfactory, but the rate of rise of current was slow. In addition, voltage hold-off capability was marginal. To improve these characteristics, a low pressure of hydrogen, 7 to 25 mtorr, was added. Considerably improved firing characteristics and reliable voltage hold-off at 320 kV were obtained.