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。
电缆的屏蔽要求是根据不同场合分别采用：对绞组合屏蔽、对绞组成电缆的总屏蔽、对绞组合屏蔽后总屏蔽等方法。
以此类推25对色标排列：白兰、白橙、白绿、白棕、白灰、红兰、红橙、红绿、红棕、红灰、黑兰、黑橙、黑绿、黑棕、黑灰、黄兰、黄橙、黄绿、黄棕、黄灰、紫兰、紫橙、紫绿、紫棕、紫灰全塑市话电缆缆芯采用全色谱线对。
RVVP is a kind of soft PVC insulated wire conductor and shield cable and PVC sheathed. Copper core PVC insulated shield PVC sheathed flexible cable voltage 300 v / 300 v 2-24 core purpose: installation of instruments, meters, intercom, monitoring, control scope of application: suitable for ac rated voltage up to and including 300/300 electronics, instruments and electronic equipment and automation devices such as shielding line executive standard s s GB5023.5 JB8734.5-1998-85 using feature s rated voltage: 300/300 v s rated temperature: AVP - 90, RVP - 90 type 900 C, the other shows characteristics of model 700 C s conductor: many strands of bare copper wire or tinned copper wires twisted s shielding ways: woven or inclined round (customer requirements) s conductor some conclusions: 1-24 core s insulation, RVP: (1) the AVP - 90-90: PVC/E PVC insulated (2) the AVP: PVC/C type PVC insulated (3) the rest of the models: PVC/D type PVC insulated s stranded: insulated conductor cable with filling (if any).
Levels have pressurization - CMP (air/air duct, sodium experiment Plenum Flame/Steiner Tunnel) this is the requirements of the Cable UL fire (Plenum Cable), applicable for UL910, experimental regulations at the levels of device duct laying on multiple samples, with a 87.9 KW gas Bunsen burner (300000 BTU/Hr) for 20 minutes. Qualified for flame does not extend 5 feet away from gas lamp flame front.
1.5综合护套铁路信号电缆的理想屏蔽系数≤0.8；铝护套铁路信号电缆的理想屏蔽系数≤0.32型号、名称及规格-铁路信号电缆PTYAT22型号名称敷设范围规格（芯）-铁路信号电缆PTYAT22PTY23聚乙烯绝缘钢带铠装聚乙烯外护套铁路信号电缆PZYA22聚乙烯绝缘综合护套钢带铠装聚氯乙烯外护套铁路信。
HB型混合式步进电机结构为两个导磁圆盘中间夹着一个永磁圆柱体轴向串在一起，两个导磁圆盘的外圆齿节距相同，与前述的VR型可变磁阻反应式步进电机转子结构相同，其两个圆盘的齿错开1/2齿距安装，转子圆柱永磁体轴向充磁一端为N极，另一端为S极。
此种电机转子与前面叙述的PM型永磁步进电机转子从结构来看，PM型转子N极与S极分布于转子外表面，要提高分辨率，就要提高极对数，通常20mm的直径，转子可配置24极，如再增加极数，会增大漏磁通，降低电磁转矩；而HB型转子N极与S极分布在两个不同的软磁圆盘上，可以增加转子极数，从而提高分辨率，20mm的直径可配置100个极，并且磁极磁化为轴向，N极与S极在装配后两极磁化，充磁简单。
通信电缆与架空明线相比，具有通信容量大、传输稳定性高、保密性好、少受自然条件和外部干扰影响等优点。
是由多根互相绝缘的导线或导体绞成的缆心和保护缆心不受潮与机械损害的外层护套所构成的通信线路。
质量保障，信誉第一，由多根互相绝缘的导线或导体构成缆芯，外部具有密封护套的通信线路。
2、敷设时环境温度≥0℃。
3、最小弯曲半径：4、无铠装层电缆，应不小于电缆外径的6倍。
5、有铠装或铜带屏遮结构电缆，应不小于电缆外径的12倍。
6、有屏遮结构的软电缆，应不小于电缆外径的6倍。
电力铁路专用电缆1、产品执行标准：GB参照采用IEC227，耐电压优于IEC227），GA阻燃型）。
产品型号：RVVSP双绞屏蔽电缆应用标准：JB8734.5GB5023.5-1997电缆结构：导体：无氧裸铜丝符合GB/T3956第5种或第6种绞合导体绝缘：PVC/D型聚录乙烯绝缘符合GB5023.1与GB/8815线芯：两两绞合短节距对绞线芯填充物：PP带或无纺布包裹缓冲屏蔽：裸铜丝或镀锡铜丝编。
Fire - resistant cable refers to the cable which can keep safe operation for a certain period of time under the condition of flame burning. China's national standard GB12666.6 IEC331 (equivalent) will fire test points A, B two levels, A grade flame temperature of 950 ~ 1000 ℃, the duration for fire, 90 min, class B flame temperature of 750 ~ 800 ℃, for fire duration 90 min, during the whole test, the sample should be under the rated voltage value of the product. Fire-resistant cable is widely used in high-rise buildings, subway, underground street, large power stations and the important industrial and mining enterprises and other related to fire security and its lifesaving, for example, fire fighting equipment and emergency light guide emergency facilities such as power supply circuit and control circuit.
6、综合护层：缆芯外纵包一层双面涂塑复合铝带作屏蔽，并在其外面挤包一层黑色低密度聚乙烯，共同形成挡潮护套层。
7、自承式电缆：采用8字形挤出模具，对自承钢索与铝塑纵包缆芯挤塑。
8、铠装（适用于铠装电缆23、22、53型）；在综合护层外绕包两层镀锌钢带（适用于23、22型电缆）或纵包一层涂塑钢带（适用于53型电缆）。
●电缆的燃烧特性成束阻燃型电缆能经受GB/T18380.3(IEC332-3)规定的成束不延燃计算机电缆适用于额定电压500V及以下对于防干扰性要求较高的电子计算机和自动化连接用电缆。
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。
差动保护在运行过程中就要对电流互感器负荷大小进行严格控制，依据系统实际运行需要来适当降低电流互感器的励磁电流。
常见的降低二次负荷方式有，降低控制电缆的电阻、优先选用弱电控制的电流互感器，并定期对互感器的工作运行状态进行严格检查，确保其运行性能良好。
质量检修法当前电力市场中，电流互感器的产品种类有很多种，不同的类型所适用的范围也不同，在具体选择时需要结合系统的保护方式来确定，根据保护装置来选择。
9.电线重量:1.5平方约重2.2公斤,2.5约重3.3公斤,4平方约重4.8公斤,6平方约重6.8公斤,快递以实际重量为准,只供参考.电线火线为红色，零线可选颜色有：红、黄、蓝、绿、棕、白、黑、双色几种。
Flame-retardant audio cable; ZC manufacuring HYA, ZC HYAC, ZC - HYAT, ZC - HYA53, ZC HYAT53, ZC HYV, ZC - HYA23, ZC - HYAT23, ZC HYA22, ZC HYAT22 product description: our factory produced communication cable is suitable for the fixed overhead laying or buried in the city ZR - manufacuring HYA: copper solid tidal polyolefin insulation layer of flame retardant polyethylene sheath duct ZC - HYAT: Copper solid tidal level flame retardant polyolefin insulated filled type PE sheathed in communication cable ZC - edge tidal layer PE sheathed gangsu belt sheathed flame-retardant PE sheathed in communication cable ZC - HYAT53: copper solid polyolefin insulated filled type HYAC: copper solid polyolefin insulation messenger tidal level flame retardant polyethylene sheath duct ZC - HYA53: copper solid polyolefin unique tidal layer PE sheathed gangsu belt sheathed flame-retardant PE sheath duct ZC - HYA22: Copper solid tidal polyolefin insulation layer polyethylene sheath steel tape armoured flame retardant PVC sheathed in communication cable ZC - HYA23: copper solid tidal polyolefin insulation layer polyethylene sheath steel tape armoured flame retardant polyethylene sheath duct ZC - HYAT22: copper solid polyolefin insulation filling type tidal layer polyethylene sheath steel tape armoured flame retardant PVC sheathed in communication cable ZC - HYAT23: copper solid polyolefin insulated filled type tidal layer PE sheath steel tape armoured flame retardant PE sheathed communication cable in the city
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。
本厂创建于1971年，是以生产销售各类煤矿用阻燃通信电缆、矿用屏蔽电缆，矿用屏蔽通信电缆，矿用电话电缆，矿用屏蔽信号电缆，矿用阻燃信号电缆，煤矿用阻燃信号电缆、矿用阻燃控制电缆，煤矿用阻燃通讯电缆、矿用电缆、矿用通信电缆、矿用信号电缆、矿用通讯电缆、，矿用控制电缆，矿用监控电缆、传感器电缆、信号电缆。