3、技术指标：聚氯乙烯绝缘电缆长期允许工作温度不超过70℃，电缆的敷设温度应不低于0℃，外径（D）小于25mm电缆的允许弯曲半径，应不小于电缆外径的4倍；外径（D）为25mm及以上的电缆的允许弯曲半径，应不小于电缆外径的6倍。
DJYPV(R)P聚乙烯绝缘铜丝编织分屏总屏聚氯乙烯护套计算机用屏蔽(软)电缆。
DJYV(R)P2聚乙烯绝缘铜带绕包总屏聚氯乙烯护套计算机用屏蔽(软)电缆。
DJYP2V(R)聚乙烯绝缘铜带绕包分屏聚氯乙烯护套计算机用屏蔽(软)电缆。
The cross section of the control cable is generally no more than 10 square meters, and the power cable is mainly used to transport power, which is generally large. Due to the above all when it comes to the reason, the specifications of the power cable can generally larger, to 500 square feet (normal manufacturer can produce range), again big cross section of the general factory is relatively less, you can do and control cable section generally small, generally not more than 10 square, tell from some cable, power cable according to the demand of power grid more generally for 5 core, and control cable transmission control, some more, according to the terms of more than 61 core, but also can produce according to user requirements.
本产品适用于各种火灾危险较大，消防安全重要性较高场所的电气装备及控制系统作连接线。
适用于各种火灾危险性较大，消防安全重要性较高的场所，电气装置及控制系统。
耐火控制电缆一、产品特点及用途：本产品具有较高的耐火能力，经受火焰直接燃烧情况下，在一定的时间内不发生短路和断路故障，在火灾发生时，有利于灭火及减少损失。
Any kind of laying can be adopted, which is more suitable for laying in rock area. HYA23 double metal clad double sheath communication cable HYAT series oil filled telecommunication cable (HYAT HYAT23, HYAT53: HYAT23 100 x2x0. Details of the 4: multi-cores iron cable HYAT23 HYA23 200 x2x0. 4 big logarithmic armoured cable HYAT23 logarithmic galvanized steel cable.
目前国内生产调节阀有(线性)、(等百分比)、(对数)3种流量特性。
2气动调节阀的手轮机构一般有(侧装式)手轮机构和(顶装式)手轮机构。
.2球阀按阀芯的结构形式可分为(O)型和(V)型两种。
2三通阀按其作用形式分为(合流型)和(分流)两种。
2阀门定位器是基于(力平衡)原理工作的。
2工程施工过程中，应对已安装的(仪表设备及材料)进行保护。
2仪表工程施工前，应对施工人员进行(技术交底)。
2就地安装仪表的中心距操作地面的高度宜为(1.2-1.5)米。
Specializing in the production of research and development of various kinds of flame retardant communication cable, control cable, flame retardant, flame retardant signal cable, communication cable, mining cable, flame retardant mine communication cable, mine, mine communication cable, signal cable, mining control cable, cable for mine monitoring, mine monitoring cable, mine remote sensing cable, control cable, computer cable, flame retardant cable, fire-resistant cable, communication cable in the city, railway signal cable, communications equipment such as the power cord, mine cable main products are: MHYV MHYAV, MHYA32 MHY32, MHYVP, MHYVR, MHYVRP, MKVV, MKVV22, MKVV32, MKVVR, MKVVP etc., all kinds of products are all in the coal Ann mark certificate and complete specifications, products are widely used in the monitoring system of coal mine and coal mine system. The products have been used in dozens of coal industry groups and mines across the country, and have won high evaluation and praise.
该条件均适用于U0和U值。
当用于直流系统时，该系统的标称电压应不大于电缆额定电压的1．5倍。
注：系统的工作电压允许长时间地超过该系统标称电压的10%。
如果电缆的额定电压至少等于该系统的标称电压，则电缆可在高于额定电压10%的工作电压下使用。
Product description: this product is suitable for ac rated voltage 450/750v and below power, household appliances, instruments, telecommunications equipment, lighting circuits and automation.
Our products are widely used in all major coal mine systems and coal mine monitoring systems. Sales to coal companies and mining groups throughout the country; And become a number of mining equipment companies supporting products, established long-term cooperation relations, products have been users praise and trust! The city at the same time my company production of all plastic communication cable, telephone cable, big logarithmic communication cable, computer cable, power cord of communication equipment and railway signal cable, airport with flare path, various documents are complete, reliable quality!!!!!
VVZ;特点：交换机动力电缆传输专用电缆，具有柔软、易弯曲、阻燃等优点。
VV-不阻燃，硬动力电缆，不易弯曲，适用于固定敷设。
ZR-VV-阻燃，硬动力电缆，不易弯曲，适用于固定敷设。
阻燃通信电缆用途：主要用于传输音频、150kHZ及以下的模拟信号和2048kbit/s及以下的数字信号。
RS485屏蔽双绞电缆又叫RS-485通讯电缆,RS485总线,RS485现场总线,RS485屏蔽电缆,RS485信号电缆,RS422电缆,STP-120屏蔽双绞电缆,RS485-22有叫ASTP-120欧姆铠装双绞屏蔽电缆,外皮颜色为灰色PVC护套,一般用于电厂。
RC电路充电公式Vc=E(1-e(-t/R*C))。
关于用于延时的电容用怎么样的电容比较好，不能一概而论，具体情况具体分析。
实际电容附加有并联绝缘电阻，串联引线电感和引线电阻。
还有更复杂的模式--引起吸附效应等等。
供参考。
E是一个电压源的幅度，通过一个开关的闭合，形成一个阶跃信号并通过电阻R对电容C进行充电。
E也可以是一个幅度从0V低电平变化到高电平幅度的连续脉冲信号的高电平幅度。
电容两端电压Vc随时间的变化规律为充电公式Vc=E(1-e(-t/R*C))。
电缆地线芯绝缘采用具有抗氧化性能的K型B类低密度聚乙烯。
聚乙烯的绝缘电阻高，耐电压好，介电系数小和介质损耗温度和变频率的影响也小，不但能满足传输性能的要求，能确保电缆的使用寿命。
为了减少回路间的相互串扰和外部干扰，电缆采用屏蔽结构。
视频线SYV-75-5,SYV-75-3,电源线RVV,屏蔽线RVVP供应视频线SYV-75-5,SYV-75-3,电源线RVV,屏蔽线RVVP供应视频线SYV-75-5,SYV-75-3,电源线RVV,屏蔽线RVVPSYV-75-3SYV-75-5SYV-75-7SYV-75-9SYV-50-3S。