b.周围环境温度：25℃ c.土壤热阻系数：1.0K•m/W d.直埋深度：0.7m e.不同环境温度下载流量校正系数：环境温度（℃）1520253035校正系数1.111.051.000.940.88额定电压35KV及以下交联聚乙烯绝缘电力电缆 。
尤其适用于计算机集散控制系统。
传递生产装置过程变量的检测、控制、连锁、报警等模拟和数字信号。
产品具有优良的抗干扰性能，长期工作温度-15～105度，阻燃特性按照GB12666.5-90标准。
ZRVVR电源电缆10平方16平方25平方ZRVVRRVVZZR-RVV通信用阻燃软电缆本产品是适用于通信局（站）及高层建筑等电源的输、配电系统中用的阻燃软电缆。
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电缆的长期允许工作温度≤90℃，电缆导体短路温度≤250℃，持续时间≤5S，电缆敷设时温度不得低于-20℃，电缆的允许弯曲半径≥15倍电缆外径。
电缆的长期允许工作温度≤90℃，电缆导体短路温度≤250℃，持续时间≤5S，电缆敷设时温度不得低于-20℃，电缆的允许弯曲半径≥15倍电缆外径。
产品型号:KVVRP2-22--ZR-KVVRP2-22--ZR-KVVP2-22-R。
产品展商:天津市电缆总厂第一分厂简单介绍：专业生产:KVVRP2-22--ZR-KVVRP2-22--ZR-KVVP2-22-R铜芯绝缘和护套铜带屏蔽钢带铠装（阻燃）控制电缆。
VV22铜芯聚氯乙烯绝缘钢带铠装聚氯乙烯护套电力电缆。
VVR22铜芯聚氯乙烯绝缘钢带铠装聚氯乙烯护套软电力电缆。
VLV22铝芯聚氯乙烯绝缘钢带铠装聚氯乙烯护套电力电缆。
VV32铜芯聚氯乙烯绝缘钢丝铠装聚氯乙烯护套电力电缆。
在升级的输送皮带投入运行半年的时间里，皮带司机按照将整条输送线上的矿石都运送干净再停机的程序进行操作，期间未见异常。
直到那天，一位皮带检修工在巡检过程中不慎将铁锤掉落到正在高速运行的皮带上，想到铁锤一旦被输送到后级粉碎机所造成的后果，该工人便冲进控制室，迫不及待地拍下“急停”按钮。
随之整条输送线停止了运行，可还未等该工人来得及庆幸，本人原来关注过的那段爬升输送皮带在惯性作用下满载着成吨的矿石，出现了严重“溜车”现象。
在一定条件下，也可用于传输2048kbit/s及以上的数字信号。
HYA、HYAT用于架空、管道敷设。
HYA53、HYA23、HYAT53、HYAT23型适用于直埋。
GHYAT、GHYAT53高速公路用通信电缆是为高速公路紧急电话系统而设计。
RS485 cable product description: Characteristic impedance of 100 ohms, conductor is 2 * 2 * 24 awg multi-strand tin electrolytic copper wire twisted and become, insulating sheath like installation of design and color recognition, overall **** aluminum foil/polyester belt shielding, additional independent stranded tinned copper wire grounding conductor, industrial gray PVC outer sheath, the standard 1 to RS - 485 communication cable, the characteristic impedance of 120 ohms, conductor is 2 * 24 awg stranded tinned copper wire, PE insulation, covered with aluminum foil/polyester composite with **** + 90% tin plated copper wire cover, double shielding with independent grounding conductor is RS - 485 communication cable.
RS485 bus due to its wiring is simple, stable and reliable and widely used in video surveillance, access control intercom, building alarm and other fields, however, because there are a lot of in the process of 485 bus wiring is not completely accurate concept leads to many problems. Some wrong ideas will now be clarified.
The directly buried installation (℃) in the air for laying
Flame retardant cables and fireproof cables: the difference between the average person is very easy to confuse the concept of flame retardant cables and fireproof cables, although there are many more flame retardant cable applies to the advantages of chemical enterprise, such as low, low smoke, non-halogen, but in general, fire-resistant cable can replace flame retardant cable, and flame retardant cables can't take place of fire-resistant cable.
1. The cable conductor of long term working temperature should be allowed no more than 70 ℃, in the process of using cable should prevent high temperature radiation or contact; Cable laying ring
中间继电器实质上是电压继电器。
但它的触点对数多，触头容量较大，动作灵敏。
中间继电器的主要用途是：当其它继电器的触头对数或触头容量不够时，便可以借助中间继电器来扩大它们的触头数和触头容量，起到中间转换的作用。
下图是JZ7系列的中间继电器的外形结构，大家可以参考一下：上图所示的中间继电器是由静铁芯、动铁芯、线圈、触点系统、反作用弹簧和复位弹簧等组成。
它的触点对数较多，没有主、辅触点之分。
各对触点允许通过的额定电流也是一样的，都为5A。
Self-supporting full-plastic cable (HYAC) : self-supporting full-plastic cable has two kinds of concentric structure and calabash structure. The commonly used HYAC full-plastic cable is calabash structure. Wire: annealed bare copper wire with diameter of, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9; Color the insulation line according to the full chromatographic standard. A single insulated wire is twisted in pairs at different pitch to minimize crosstalk and a specified chromatographic combination is used to identify pairs of wires. Cable core: the cable core structure is based on 25 pairs of cables. More than 25 pairs of cables are assembled according to the unit. Each unit is wrapped with the unit of specified chromatogram to identify different units. More than 100 pairs of cables plus 1% of the reserve pair. Shielding: the shielding layer is made of corrugated metal tape which is wrapped vertically on the outside of the cable core wrap belt and firmly bonded on both sides. The metal strip of the shielding layer is coated with plastic film to facilitate bonding with the sheath to prevent corrosion of the shielding layer. Protective sleeve: protective sleeve is black low density polyethylene, can use double protective sleeve according to the need.
3、矿用控制电缆产品型号规格及范围： 矿用控制电缆型号 规格范围 使用场合MKVV,MKVVP,MKVVP2 0.5-10mm2,2-61芯 适用于弱电控制系统或强电磁场干扰区MKVV22,MKVV20 0.5-10mm2,4-61芯 MKVV32,MKVV30 0.5-10mm2,7-61芯 M。
1、在50MHz以下衰减常数偏大或超差，而高频有余量，常常是铝塑复合带中的铝基太薄所致，在频率比较低的时候，铝基的厚度小于或与该频率的透射深度相当，造成了α过大。
根据理论计算，f=50MHz时的铝层透射深度为12.2µm。
RVVZ-1000V选用参数规格/1芯(mm2)参考外径(mm)参考重量(kg/km)2.56.1584.07.1536.08.1110109.41651611.32402513.23503514.34605017.56507018.98509521.21。