6 kv and above cable joint: (1) installing a cable terminal head, must be stripped semiconductor electric shielding layer, operation shall not damage the insulation, should avoid mark uneven situation, when necessary use sand paper to grind; The shield end should be flat and the graphite layer (carbon particles) should be clean. (2) plastic cable end copper tape screened and armor must be good grounding, the short circuit also follow this principle, avoid unbalanced three-phase run ShiGang armoured end produce inductive electromotive force, and even "lighter" and sheath and other accidents. It is required to use my tinplate to braid copper wire for grounding lead. When connecting with the cable copper belt, it should be welded with chromium-iron tin. The shield of three-phase copper tape should be connected with ground wire respectively. Note that the shielded ground wire and steel armor ground wire should be separately drawn out and insulated from each other. The position of the welded ground wire should be as low as possible.
1、YJV22－1KV3×35mm2 +1×16mm22、YJV22－1KV3×95mm2 +1×50mm23、YJV22－1KV3×120mm2 +1×70mm24、YJV22－1KV3×150mm2 +1×70mm25、YJV22－1KV3×185mm2 +1×95mm26、YJV22－1KV3。
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、名称及规格型号名称敷设范围规格(芯)PTYV聚乙烯绝缘聚氯乙烯护套铁路信号电缆敷设在土壤、槽、管中，能承受一般的机械外力。
This product is suitable for communication lines in urban, suburban and local areas. Conductive core wire adopts soft copper wire with nominal diameter of 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9mm. Twisted into the single wire insulation after the heart type (10, 20) or the unit type twisted into core (30 to and above), each basic unit of the unit with same color, the basic unit of cable tie color arrangement according to the re of the chromatography. On the surface of the cable core, a non-hygroscopic polyester belt or a non-woven cloth belt is used to wrap the cable core and then add the longitudinal package of the moisture-proof metal shield belt. The outer sheath can be made into polyurethane or chlorine sheath. The self-supporting cable is to squeeze the cable core and steel strand parallel to the same "8-character" calabash outer sheath. ?
IEC/BS4066-1阻燃等级（单根电线或电缆垂直燃烧测试FlameTestONSingleVerticalInsulatedWires/Cables）这是单根电缆的阻燃标准。
IEC/BS4066-3阻燃等级（成束电线或电缆垂直燃烧测试FlameTestOnBunchedWires/Cables）这是成束电缆的阻燃标准。
作为电气工作者，当你看到这个标题会感到三角好笑，三相电动机接法电机铭牌上不就有说明吗？这有啥可以疑问的。
不就是星形接法和三角形接法这两种最为常见。
事实好像不是这样的。
笔者在20岁左右的到我们临县去学习维修电机，对于常见的三相电动机而言，其绕组是成对称分布在电动机的定子铁芯槽中的。
三相绕组可为星形或者三角形联结，相绕组由支路构成，支路有若干线圈组构成，线圈组又有分线圈构成。
并且还有单双层之分。
（这是对于双速电机来说的）一般来说，按照功率来分4千瓦以下的电机一般接成星形，大于4千瓦的电机接成三角形。
Cable conductor of long term working temperature should be allowed no more than 70 ℃, the cable in use should be to prevent high temperature radiation or; The environment temperature under installation should not below 0 ℃.
Flame retardant grade: B for fire temperature: 815 ℃ or higher for fire time: 40 min into a bundle of cable laying nonmetallic material volume: acuity 3.5 litres/m carbonized height: 2.5 meters or less self-extinguishing time: 1 h or less;
HYAT23：铜芯实心聚烯烃绝缘填充式挡潮层聚乙烯护套钢带铠装聚乙烯护套市内通信电缆。
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系统而设计。
Fire - resistant cable is able to maintain a certain period of normal operation under the condition of flame burning, can maintain the integrity of the line. That, when burned, fire-resistant cable less acid gas smoke, fire flame retardant performance is greatly improved, especially when burnt, accompanied by water jet and mechanical blow, cable still can maintain a full operation.
聚氯乙烯电缆包括vv电缆，vv22电缆，vlv电缆，vlv22电缆，zrvv电缆，nhvv电缆，zrvv22电缆，nhvv22电缆，护套线型号产品名称电压芯数截面主要适用范围VVVLV铜芯、铝芯聚氯乙烯绝缘聚氯乙烯护套电力vv电缆0.6/1KV4+1,3+。
吊线和电缆用同一外护层，经济实用，安装敷设方便。
在一30~C一60~C的环境条件下，自承式电缆的机械和电气性能保持不变。
结构：导线：退火裸铜线，铜线直径为0．32，0．4，0．50，0．60，0．70，0．80，0．90mm。
低速过电流保护环节：当发电机转速下降或因其他原因使磁场电流超过规定值时，Jl动作，将触发器电源短路，可控硅立即关闭，发电机失压，避免可控硅过电流而损坏。
上面电路图老，但控制原理与现在普通型发电机这一个工作原理。
你所说发电机电压低，则说明励磁电流不够，而这个问题主要出在比技环节。
这时你可将同步变压器B1的220Ⅴ从发电机线路脱开，用市电220Ⅴ电源输到B1，看同步变压器的三个低压绕组的交流电压是否达到图上标注的值，AC2.5×2AC70VAC32Ⅴ。
根据变频电机专用电缆的实际使用情况并参照GB/T和ABB日公司对电力传动电缆的技术条件，确定了电缆的电气性能参数。
变频电缆的主要制造工艺技求在变频电机专用电缆生产过程中，绝缘线芯挤包工序、成缆工序等是最关键的工序。
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。
最低环境温度聚氯乙烯护套固定敷设-40℃非固定敷设-15℃电缆安装敷设温度不低于0℃计算机屏蔽电缆型号：(型号加R表示软导体)DJVVP聚氯乙烯绝缘铜丝编织总屏蔽聚氯乙烯护套计算机电缆DJVPV聚氯乙烯绝缘铜丝编织分屏蔽聚氯乙烯护套计算机电缆DJVPVP聚氯乙烯绝缘铜丝编织分屏总屏聚氯乙烯护套计算机。
4.安装敷设温度：不低于0℃5.电缆允许最小弯曲半径：非铠装、联锁或编织铠装电缆不小于电缆外径的6倍铜带屏蔽或钢丝、钢带缠绕铠装电缆不小于电缆外径的12倍四、主要技术指标性能项目单位指标导体线芯直流电阻(20℃)Ω/km标称截面mm20.50.75。