5、生产范围型号额定电压V芯数标称截面mm2227IECRV300/50010.3-10450/75011.IECRVB300/30020.IECRVS300/30020.3-0.25227IECRVV300/3002-300.5-6.。
公司主营产品：电力电缆控制电缆计算机电缆电缆电线电线电缆我们专业从事电线电缆的生产及销售.我们的产品****,种类齐全,有各式电线电缆,国内订购均可配送.我们将以最优质的服务达到您的满意天津市电缆总厂第一分厂主要产品目录1、煤矿用通信电缆MHYV(1-10对)MHYAV(5-100对)MHYA对)M。
Product introduction - mine control cable MKVV mine control cable MKVVR mine control cable shielding control cable MKVV32 MKVVP mining mine control cable MKVVRP mine shielding control cable for mine control cable MKVV22 mine flame-retardant control cable for mine monitoring control cable for mine cable type MKVV, MKVV22, MKVV32, MKVVR, MKVVP, MKVVRP 1, mine control cable standards and specifications: MT818-1999-2, flame-retardant control cable for mine purposes: This product is suitable for the control and monitoring circuit with rated ac voltage u0/u of 450/750v or below and the connecting line of the protection circuit and the electrical instrument in the distribution device. 3. Model specifications and scope of mine control cable products: Model specifications of the control cable for mining use: MKVV,MKVVP, mkvvvvvvvvvvp2-10mm2,2-61 cores are applicable to the weak current control system or mkvvvv22 of the strong electromagnetic field interference area. MKVV20 0.5-10mm2,4-61 core mkvvv32, mkvvvvv30 0.5-10mm2,7-61 core MKVVR 0.5-6mm2,2-61 core MKVRP 0.5-4mm2,2-61 core mkvvvvvvp22, mkvp2-221.5-10mm2, 4-22 core mkvp2, 1.5-10mm2 Is mainly used for 500 kv substation and power distribution device and strong electromagnetic interference zone MKVV - 1, MKVV22 0.5 was 10-1, 4, 2-61 core features: coal mine with control cable conductor long-term allowed working temperature is 70 ℃, the cable temperature under installation should not below 0 ℃. Permissible bending radius of control cables used in coal mines: for cables with armored or copper band shielding structures, the bending radius should not be less than 12 times of the outer diameter of the cables. For soft cable with shield layer structure, it should be no less than 6 times the outer diameter of the cable. The cable without armor layer should not be less than 6 times the outer diameter of the cable.
使用特性：1、额定电压：交流Uo/U；450/750V2、工作温度：序号1～4-60～+200℃序号5～14-15～+105℃3、绝缘电阻（20℃）不低于50MΩ•km4、导体线芯直流电阻（20℃）符合GB规定5、无铠装电缆允许弯曲半径不小于电缆外径的6倍，铠装电缆允许弯曲半径不小于电缆外径的12倍。
专业生产视频同轴电缆，主要产品： 1、视频同轴电缆SYV-75欧姆系列（-3、-4、-5、-7、-9、-12、-15、-17）2、视频同轴电缆SYV-50欧姆系列（-2、-3、-5、-7、-9、-12、-15、-17） 3、视频同轴电缆SYV-100-7欧姆系列 欢迎广大新老客户来样定做，批量不论大。
L、C元件称为“惯性元件”，即电感中的电流、电容器两端的电压，都有一定的“电惯性”，不能突然变化。
充放电时间，不光与L、C的容量有关，还与充/放电电路中的电阻R有关。
“1UF电容它的充放电时间是多长？”，不讲电阻，就不能回答。
RC电路的时间常数：τ=RC充电时，uc=U×[1-e(-t/τ)]U是电源电压放电时，uc=Uo×e(-t/τ)Uo是放电前电容上电压RL电路的时间常数：τ=L/RLC电路接直流，i=Io[1-e(-t/τ)]Io是最终稳定电流LC电路的短路，i=Io×e(-t/τ)]Io是短路前L中电流设V0为电容上的初始电压值；V1为电容最终可充到或放到的电压值；Vt为t时刻电容上的电压值。
型号及名称型号 名称 适用范围VV VLV聚氯乙烯绝缘聚氯乙烯护套电力电缆 敷设在室内、隧道及管道中， 。
DJYDPYD(R)低烟无卤阻燃聚烯烃绝缘和护套铜丝编织分屏计算机用屏蔽(软)电缆。
DJYDPYD(R)P低烟无卤阻燃聚烯烃绝缘和护套铜丝编织分屏总屏计算机用屏蔽(软)电缆。
DJYDYD(R)P2低烟无卤阻燃聚烯烃绝缘和护套铜带绕包总屏计算机用屏蔽(软)电缆。
dingradiusofmulticore-cableshouldnotlessthan15timesofthecablediame。
电缆的交流额定电压500V以下，电缆线芯的长期工作温度应不超过70℃。
产品型号及名称 ZR-DJYPV计算机电缆：聚乙烯绝缘铜丝编织分屏蔽聚氯乙烯护套阻燃型电子计算机用电缆 ZR-DJYVP计算机电缆：聚乙烯绝缘铜丝编织总屏蔽聚氯乙烯护套阻燃型电子计算机用电缆 ZR-DJYPVP计算机电缆：聚乙烯绝缘铜丝编织分屏蔽、总屏蔽聚氯乙烯护套阻燃型电子计算机用电缆 ZR-D。
The cable is insulated by full-chromatograph solid polycondensation. The insulated wire is twisted into a pair of twisted wires. Suitable material of cable core is added to the cable core, and the plastic coated aluminum band shielding layer and the black outer expansion sleeve with the length mark in the counting order can be completed. Junction wire: solid annealed copper wire. Copper wire diameter is 0.32, 0.4, 0.6, 0.8 (mm).
HYA internal communication cable (widely used in the construction of man communication network, mainly for overhead and pipeline installation, mainly for transmission of audio); HYAT packed communication cable (used in the construction of man communication network, mainly for pipeline installation, with water resistance effect, no need for inflation protection, mainly for transmission of audio); HYAC self-supporting communication cable (used in the construction of man communication network, overhead installation, convenient construction, mainly transmitting audio); HYAT53 filled armoured cable (HYA, a complex communications cable used in metropolitan area network construction); HYAT; HYAC manufacuring HYA communication cable type HYAC HYAT HPVV HYV HJVV HYY armoured communication cable HYA22 HYV22 HYAT22 HYY23 HYYT23 HYA23 HYAT23 HYA53 HYAT53 steel wire armoured communication cable H YA33 HYAT33 WDZ - HYA53 HYY33 HYYT33 HYY33 oil filled telecommunication cable HYAT HYYT execution: YD/T322-1996 structure features: Manufacuring HYA communication cable insulation using chromatography in the city, lu: su composite sheath of cable is applied to longitudinally wrap shielding ribbon and sheath bonded into an organic whole, forming sealing layer, has the superior electrical properties, the characteristics of the construction is convenient. Main electrical properties: 1. The dc resistance: 20 ℃, the copper wire 0.5 mm, less than or equal to 95 Ω/km. Insulated electrical strength: 2. 1 min 1 kv no breakdown between the conductor and conductor shielding 1 min 3 kv is not breakdown (3) insulation resistance: each conductor and the rest of the grounding wire core, more than 10000 m Ω manufacuring HYA cable. Km, more than 3000 m Ω HYAT cable. Km. 5. Remote crosstalk defense: 150kHZ, the average power of the combination is greater than 69dB/km. Mine communication cable: 1. Execution: mt818.14-1999 2 purpose: this product is used in well
一般认为，到20m处时，电流密度为零，电位也等于零即到达了电工技术中的零电位。
电流I在流过接地电阻Rx时产生的压降IRx，在流经Rc时同样产生压降IRc。
被测接地电阻Rx的值，可由电流互感器的变流比K以及电位器的电阻RS来确定，而与RC无关。
接地电阻表的使用1）拆开接地干线与接地体的连接点。
接地电阻表接线。
将仪表放平，检查检流计指针是否指在中心线上。
正确接线。
将倍率开关置于最大倍数上，缓慢摇动发电机手柄，转动“测量标度盘”，使检流计指针处于中心线位置上。
直流电阻:20℃,0.4mm铜线,小于等于148Ω/km，0.5mm铜线,小于等于95Ω/km。
2.绝缘电气强度：导体之间1min1kv不击穿导体与屏蔽1min3kv不击穿3.绝缘电阻：每根芯线与其余线芯接地，控制电缆大于10000MΩ.km,HYAT电缆大于3000MΩ.km。
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。
三、使用特性： 1、电缆长期工作温度：-30~60℃2、电缆敷设温度： 不低于0℃3、MHYV型弯曲半径不小于电缆直径的10倍。
耐火系列电力电缆的整体性能优良可靠。
防火电缆的阻水性能符合IEC502-2规定。
电力电缆安装注意事项：电缆与热力管道平行安装时保持2m的距离，交叉时应保持0.5m。
电缆与其它管道平行或交叉安装时均要保持0.5m的距离。
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。