Mt386-1995 test methods and determination rules for fire retardancy of fire retardant cables used in coal mines and Q/TX 001-2006 plastic insulation control cables used in coal mines.
二、执行标准 GB9330-1988 三、使用特性 1.电缆导体的长期允许工作温度应不超过70℃,敷设环境温度应不低于0℃。 2.电缆敷设安装允许弯曲半径应不小于电缆外径的12倍。
另外我厂最新研制开发出自承式组合电缆在SYV75-5+RVV+RVVP电缆基础上,电缆另加一根自承式钢丝,使电缆拉力大大增强。主要技术性能:1)额定电压:交流50Hz,500V。2)试验电压:交流50Hz,2000V。
5.护套:护前直径是8.2毫米,护后直径12毫米(11.7--12毫米之间),护套为阻燃蓝色护套一、产品用途及特点本产品适用于矿山、井下环境监控系统中传输通信信号。本产品是阻燃类产品。二、执行标准 MT818.《煤矿用阻燃通信电缆》及企业标准Q/JG。

This is the flame retardant of a single cable. Test rules, a 60 cm long specimen vertically fixed on the wall before the metal cabinet, flame length is 175 mm of propane fixed end 450 mm from the top of the samples from the position of flame cone and cable with 45 degree Angle, if damaged part sample distance lower fixed end no more than 50 mm, through. Iec 60332-3/ bs40666-3 flame retardant rating (bunched wire or cable vertical)
下载组态信息2.调用modbus功能块西门子的通讯一般都需要调用系统功能块,在“指令”-“通信”-“通信处理器”下可以找到modbus通讯功能块:通讯功能块可以看到这里提供两套modbus通讯模块,这两套都可以使用(暂不清楚具体的区别),本文选用的是下面的版本较低的模块。新建程序段,将配置模块MB_COMM_LOAD和主站模块MB_MASTER拖入程序中:调用功能块功能块调用后要对必要的引脚进行赋值,各个引脚的功能可以按F1查看,建立一个DB数据块,声明一些变量连接功能块的引脚:声明变量上面声明了两个容量为5的字数组,用于数据的发送和接受,这个容量可以根据需求任意设置。
This company produces the type refractory power cables for rated voltage 0.6/1 kv copper core cable, can also produce low smoke zero halogen fire-resistant power cable, high flame retardant fire-resistant power cable oxygen insulation layer, the fire-resistant performance in line with the GB/T12666.6 cable fire resistance test method. Therefore, the overall performance of refractory series power cables is good and reliable. The water resistance performance of fireproof cable conforms to iec 502-2.
DJYVP3 聚乙烯绝缘对绞铝塑复合带总屏蔽聚氯乙烯 护套计算机电缆 敷设室内、电缆沟、管道等要求静电屏蔽场合。DJYP3VP3 聚乙烯绝缘对绞铝塑复合带分屏蔽及总屏蔽聚氯乙烯护套计算机电缆 敷设室内、电缆沟、管道等要求静电屏蔽场合。
七:基本电缆规格及结构参数线芯*标称截面(mm2)导体结构(根数*直径)(B/R)mm电缆最大外径(mm)参考重量(kg/km)YVFRYVFRPYVFRYVFRP1*2.551*0.254.0-72-1*482*0.256.0-95-1*6123*0.257。
也可提供双层护套的通信电缆。 具有防火,防潮等特点矿用通信电缆引发火灾的原因,主要是因为过负荷、短路、接触电阻过大及外部热源作用。在短路、局部过热等故障状态及外热作用下,绝缘材料绝缘电阻下降、失去绝缘能力,甚至燃烧,进而引发火灾。

而无卤低烟阻燃电缆的绝缘层、护套、外护层以及辅助材料(包带及填充)全部或部分采用的是不含卤的交联聚乙烯(XLPE)阻燃材料,不仅具有更好的阻燃特性,而且在电缆燃烧时没有卤酸气体放出,电缆的发烟量也小,电缆燃烧产生的腐蚀性气体也缆阻燃性和降低卤酸气体发生量之间,采取折衷的方式开发出了低卤低烟阻燃电缆。
Armoured communication cable armoring cable type: HYA53, HYAT53, HYA23 HYAT23, HYV22, HYA22 (rat, buried) armoring communication cable USES: armoured communication cable mechanical protective layer can be appended to the structure of the cable, with the mechanical strength of the cable, antierosion capability, is vulnerable to mechanical and designed and vulnerable to erosion area telephone cable. Any kind of laying can be adopted, which is more suitable for direct buried laying in rock area. Armored communication cable structure: 1. Basic cable: any filled and unfilled cable with single sheath or double sheath structure. 2. Armored communication cable mechanical protection layer: type 53 adopts 0.15mm thick corrugated steel belt, which is longitudinal wrapped on the basic cable and overlapped on both sides. The surface of the steel belt is coated with plastic to prevent corrosion and water intrusion. The type 23,22 has similar performance with double steel band wrapping. 3. Armored communication cable sheath: black high-molecular weight low-density polyurethane or polyurethane sheath. Sheath thickness may depend on the basic cable outer diameter. 5. The marking contents of armored communication cables include: wire diameter, number of wire pairs, cable model, length, manufacturer name and year of manufacture. 6. Armored communication cable electrical characteristics: the cable meets all the electrical requirements of the basic cable. 6. Cable length: mechanically protected cable is made according to the length of the corresponding basic cable
NMOS的实物图和引脚分布如下图所示。什么是肖特基二极管肖特基二极管又叫势垒二极管,是由金属和半导体接触形成的二极管,其特点为:反向恢复时间非常短,为ns级别;正向导通压降非常低:为0.3-0.5V左右;漏电流较大、反向击穿电压比较低;通常用在低压开关电源中,以肖特基二极管MBR30100为例,其实物图和结构图如下图所示。该肖特基二极管有三个电极,其中一个公共端是阴极,由两个二极管共阴极构成。关于场效应管的反向并接的二极管的问题?有些场效应管的规格书里原理图上标有一个稳压管符号,为了搞清楚其中的真正情况,我们抽取了几种有该二极管符号的样品进行检测试验,发现有以下两种情况:1.实际是本体的寄生二极管;2集成的肖特基二极管前一种情况,估计是做文件时直接将其他文件中的图形复制过来所致。
MKVV 铜芯聚乙烯绝缘聚氯乙烯护套阻燃矿用控制电缆 (2-14)*(4-6) (2-61)*(0.75-2.5) 铺设在室内、电缆内、管道等固定场合。MKVV22 铜芯聚乙烯绝缘聚氯乙烯护套钢带锴装阻燃煤矿用控制电缆 (7-61)*(0.75-1.5) (4-14)*(4-6) 铺设在室内、电缆内、管道、直埋,能承受较大机械外力的固定场合。
低烟无卤电线特性:低烟无卤电缆(1)抗张强度比一般PVC电线大:一般PVC电线抗张强度大于1.05Kgf/mm2,而低烟无卤电线抗张强度大于1.2Kgf/mm2;(2)具有良好的耐候性(-30℃~105℃);(3)具备良好的柔软度(硬度为80—90);(4)具有非移性(因为此产品配方中不用添加可塑剂。
