传统剩余电流探测器使用问题

1 剩余电流探测器的原理 剩余电流探测器包括探测器和互感器,对于TN-S、TN-C-S、部分TT系统接地系统均可适用,不适用于TN-C系统。安装时A、B、C三相导线与N线一起穿过一个剩余CT,见图1。当三相电路中没有发生人身电击事故、设备漏电、接地故障或三相对地泄漏电流平衡时,通过剩余电流探测器零序电流红感器电流的矢量和为零,即剩余电流值为零,剩余电流动作保护装置正常运行。当三相电路中     

PMC-T40X电气火灾监控探测器

1概述 PMC-T40X电气火灾监控探测器（见图1）包括组合式电气火灾探测器、剩余电流式电气火灾探测器和测温式电气火灾探测器,完成对剩余电流、温度和三相电流的实时监控、预警、报警与保护,可有效屏蔽过滤线路中由于高次谐波产生泄漏电流的影响,自适应保护线路的正常漏电波动。     

一种剩余电流发生器研发

介绍了目前检测剩余电流式火灾探测的产品现状,阐述了剩余电流发生器的构成及其原理,分析了一种剩余电流发生器的电路工作原理,并结合现场检测实例证明了这种剩余电流发生器用于检测电气火灾监控探测器的可行性。     

多传感器组合式电气火灾监控探测器的设计

根据2014版新国标提出的电气火灾监控探测器需满足的电磁兼容和故障信号报警等要求,设计了一种多传感器组合式探测器。该探测器由剩余电流互感器、温度传感器及基于飞思卡尔MKE06Z64微控制器的相关硬件、软件组成,可实时检测剩余电流和温度变化,并在超过设定值时报警。介绍探测器的总体方案、主要电路设计并进行实验验证。     

基于两总线的电气火灾监控系统的设计

介绍了电气火灾监控系统的构成以及电气火灾监控设备、剩余电流式电气火灾监控探测器的设计过程,分析了现有总线通讯技术存在的问题,重点介绍了总线通讯接口电路、剩余电流检测电路的设计方法。     

剩余电流式电气火灾监控探测器的设置

根据民用建筑中通用用电设备正常泄漏电流的情况,结合GB 50116-2013《火灾自动报警系统设计规范》对剩余电流式电气火灾监控探测器设置的要求,分析不同类型负荷、供配电方式对探测器设置的影响;提出可以根据塑壳式断路器额定电流来简便地确定探测器的位置;并对消防线路中探测器的设置展开讨论。     

电梯类负载对剩余电流监控的影响分析及解决办法

通过实际试验，结合产品和标准分析电梯类负载在启动、运行、结束、停止等状态下监控的剩余电流，分析造成剩余电流误报警的根本原因。并就具体原因给出整体解决方案及软件、硬件的具体实现途径及方法，可大大降低剩余电流式电气火灾监控探测器的误报警率。     

小议剩余电流式电气火灾监控系统

国家标准《高层民用建筑设计防火规范》GB50045—95（2005年版）第9．5．1条发布实施后，建筑电气工程设计行业反应强烈，普遍认为不好操作；对剩余电流动作电气火灾监控系统规定要求探测过电流等信号有异议。本文通过对电气火灾的机理、剩余电流动作保护装置的工作原理、电气火灾的预防措施及剩余电流动作电器应用中存在的问题的分析，对剩余电流式电气火灾监控探测器发表几点看法。     

ARCM100型剩余电流式电气火灾监控探测器

<正>2010年3月10日,上海安科瑞电气股份有限公司研发的ARCM100型剩余电流式电气火灾监控探测器顺利通过了国家     

烟台消防全面推广城市消防远程监控系统

据悉,中国森泰电器有限公司最新研发的智能化STFL1系列剩余电流式电气火灾监控探测器最近被列入国家火炬计划,并已开始广泛应用.     

New methods for reducing the number of false alarms in fire detection systems

In this paper, we present new methods of reducing the number of false alarms in smoke detectors and apply these methods to an ionization smoke detector. The detector is able to diagnose its working condition and its environment very precisely. When the detector's environment changes, the detector can automatically determine the cause, whether the change is fire-related or not. This is done by measuring the ionization current in two sensitivity ranges of the measurement chamber and analyzing the results with new algorithms. With the help of algorithms that use fuzzy logic, we can identify basically every potential problem an ionization detector can produce.     

从某大空间性能化防火谈电气设计

从某大空间建筑性能化防火简介入手,详细分析对应的消防用电设备负荷等级应按一级负荷供电、消防用电设备线路应选用矿物绝缘电缆、火灾疏散照明的照度不小于10lx、防火卷帘控制和火灾探测可选用点型火焰探测器和线型红外光束感烟探测器等电气设计的加强措施。     

《火灾自动报警系统设计规范》探测器设置问题探讨

根据火灾时烟、温气流在平、坡屋顶上运行机理的量变、质变,提出了有别于现行《火灾自动报警系统设计规范》的点型火灾探测器的设置限定、安装曲线及其绘制;论证了曾提出的保护半径修正系数,并分析了所见错误修正的后果和介绍点型探测器在平屋顶上的经济合理快捷设置法。     

Fire detection in hyperbaric chambers

Hyperbaric chamber environments introduce new problems in fire detection. While the ionized particle detector offers great potential, the current first choice should be suitably modified infrared detectors backed up by ionized particle detectors. The ideal detector for hyperbaric service is yet to be developed. Note: This report is based on work sponsored by the U.S. Naval Civil Engineering Laboratory.     

The Effects of Detector Spacing on Traffic Forecasting Performance Using Neural Networks

An investigation was made as to how short-term traffic forecasting on motorways and other trunk roads is related to the density of detectors. Forecasting performances with respect to different detector spaces have been investigated with both simulated data and real data. Pruning techniques to the input variables used for neural networks were applied to the simulated data. The real data were collected from the M25 motorway and included flow, speed, and occupancy. With the data used in our study, the forecasting performances decrease with the increase of detector spaces. However, by taking the assumed costs of detector infrastructure into account, it may be concluded from this study that increasing coverage to a spacing of 500 m gives little extra benefit and may actually be counter productive in certain circumstances. It was concluded that, on the basis of current evidence, a detector spacing of between 1 and 1.5 km might be optimal.     

钢结构中红外探测器高度的合理设置

结合实际工程实例 ,阐述在大跨度钢结构建筑中如何确定红外光束火灾探测器的设置高度 ,并针对现行国家规范相关条文提出建议。     

Analyzing fire-induced dispersion and detector response in complex enclosures using salt-water modeling

The current investigation examines suitability of the hydraulic analog for analysis of fire-induced dispersion within a complex enclosure. This analog has been implemented using salt-water modeling and planar laser induced fluorescence (PLIF) diagnostics providing quantitative visualization of simulated fire-induced flows. The non-intrusive PLIF diagnostics are used to temporally and spatially characterize dispersion from a buoyant source within a 1/7th scale room–corridor–room enclosure. This configuration is geometrically similar to a full-scale fire test facility, where local fire conditions were characterized near five ionization type smoke detectors placed throughout the enclosure. The full-scale fire and salt-water model results were scaled according to the dimensionless fundamental equations that govern source dispersion.An evaluation of the local conditions and dispersive event times for both the systems was used to explore the ability of the hydraulic analog to predict smoke detector response times. The dispersive event (front arrival) times predicted by the salt-water model, which represents a necessary event for detector activation, were in excellent agreement with the fire test data. A methodology using these front arrival times along with local conditions at the detector location is introduced in this paper. However, the complex nature of detector response and fidelity limitations of the analog make precise predictions of detector response time challenging. The predicted dimensionless response times were within 25% for all detector locations, with the exception of the first-room ceiling detector location. For this latter, a shorter dimensionless response time by less than 40% of that in the actual fire was predicted.     

一种基于炭黑导电性能的感烟探测器的设想

在分析现有火灾探测器的探测原理、火灾发展过程及其产物的基础上，提出基于火灾产物炭黑粒子的一种感烟探测器的设想，为火灾探测器的研究提出了新的思路和方向。     

无源无线避雷器检测装置

介绍了一种低功耗避雷器在线检测装置,能够利用避雷器本身的泄漏电流工作,无需外加电源,利用电阻作为泄漏电流的采样,可以监测避雷器泄漏电流,记录雷击次数、时间,并可以将这些数据以无线方式发送给接收设备。装置主要由微处理器和无线收发模块组成,微处理器采用ATmag88芯片,工作在低功耗状态,无线数据收发采用Ti公司的CC11...     

浅析电气火灾监控系统的设计及注意事项

近年来,电气火灾监控系统已经逐渐成为建筑消防电气设计中必须考虑的重要部分.本文概述了电气火灾监控系统的组成及原理,并结合工程设计实例给出了相关的系统结构方案,最后针对剩余电流式电气火灾监控探测器在项目应用中应注意的问题进行了探讨.