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.
Armoured oil filled telecommunication cable USES: armoured communication cable mechanical protective layer can be appended to the structure of cable, in order to increase the mechanical strength of the cable, improve the ability of anti erosion, is vulnerable to mechanical damage and vulnerable to erosion area of telephone cable designed. It can be laid in any way, more suitable for direct burial in rock areas.
主要产品型号HYA、HYAC、HYAT、HYAT53、HYA531、 HYA（管道/架空）内导体线径（mm）：0.40、0.50、0.60、0.70、0.80、0.90对数 （对）：5—30002、 HYAC（架空 ） 内导体线径（mm）：0.40、0.50、0.60、0.63、0.70、0.80、。
低烟无卤阻燃电线电缆用于用于建筑、医院、图书馆、体育馆、车站、机场、地铁、地下商场、或人口密集的公共场所等低烟、无卤素、阻燃、耐火、环保产品特性：低烟无卤电线电缆在火焰燃烧情况下产生极少量烟雾，释放的气体不含卤元素，当火灾发生时，可大大减少对仪器、设备和人体的危害的环保型电缆。
绝缘：根据不同型号可采用阻燃聚乙烯、聚氯乙烯、聚乙烯三种中的一种.绝缘表面应光滑平整,厚度应均匀,最小厚度为0.4毫米.线对：可分为以下4种护套：聚氯乙烯护套材料的性能要求应符合GB8815的规定,平行室内线护套的横截面挤成扁圆形,绞合室内线的护套横截面挤成圆形.护套应完整连续,无缺陷表面光滑平整,。
并且导电按一定的相序电机就能正反转被控制——这是旋转的物理条件。
只要符合这一条件我们理论上可以制造任何相的步进电机，出于成本等多方面考虑，市场上一般以五相为多。
力矩：电机一旦通电，在定转子间将产生磁场（磁通量Ф）当转子与定子错开一定角度产生力F与（dФ/dθ）成正比S其磁通量Ф=Br*SBr为磁密，S为导磁面积F与L*D*Br成正比L为铁芯有效长度，D为转子直径Br=NI/RNI为励磁绕阻安匝数（电流乘匝数）R为磁阻。
Sheathed control cable insulation resistance: each conductor and the rest of the grounding wire core, control cable is more than 10000 m Ω. Km, more than 3000 m Ω HYAT cable. Km.
双面800对，1200对，1800对，2400对，3000对，3200对，4000对，5000对XF5-273旋卡式通信电缆交接箱，采用国内外先进工艺，按照国际上八十年代先进标准生产的电缆配线设备，供市内，城镇电信网的主干电缆与配线电缆交接之用。
6KV及以上电缆接头： ①安装电缆终端头时，必须剥除半导体电屏蔽层，操作时不得损伤绝缘，应避免刀痕凹凸不平的情况，必要时用砂纸磨平；屏蔽端部应平整，并要把石墨层（碳粒）清除干净。
②塑料绝缘电缆端头铜带屏蔽和钢铠必须良好接地，对短路也遵循这项原则，避免三相不平衡运行时钢铠端部产生感应电动势，甚至“打火”及燃烧护套等事故。
MHYVP：聚乙烯绝缘聚氯乙烯护套煤矿用信号电缆，用于电场干扰较大的场所作信号传输，可用于固定敷设阻燃变频电缆产品用途阻燃变频电缆主要用于变频电源和变频电机之间,连接用的电缆,以及额定电压1KV及以下的,输配电线路中,作输送电能用.尤其适用于造纸、冶金、金属加工、矿山、铁路和食品加工等行业。
Product model: manufacuring HYA HYAC HYAT HYY HYV HYY23 HYV23 HYYT23 HYA23 HYAT23 HYATC main products: inflatable cable, messenger overhead cables, oil-filled cable, filling type cable, shielded cable, not shielded cable manufacuring HYA cable _ inflatable cable related products manufacuring HYA cable _ inflatable cable manufacuring HYA HYAC HYA23 armoured communication cable HYV22 HYA53 HYV22 HYA23 HJVV HYA23 HYA53 telephone cable Messenger cable HJVV _HYYC HYAC HYYC HYACHYYC messenger HYYC multi-cores cable indoor communication cable HYV HYV22HYA23_ZR HYA23_WDZ - manufacuring HYA armoured communication cable HYA23_ZR HYA23_WDZ - manufacuring HYA armoured communication cable ZRC HYA23ZRC - HYAT23_ armoured communication cable ZRC HYAT23 telephone cable - manufacuring HYA HYAC HYVHYA communication cable manufacuring HYA HYAT HYAC HYV HYV23 line.
--铜芯、聚烯烃绝缘、聚氯乙烯护套市内通信电缆。
使用温度均为-30度~60度。
HYA通信电缆，HYA22HYA23铠装通信电缆。
用途：实心绝缘填充型电缆适用于本地电信网的城市与乡镇电信线路，也适用于接入公用网的专用网线路。
变压器24种接线方式相量图Yd的6种接线方式相量图Dy的6种接线方式相量图Dd的6种接线方式相量图Yy的6种接线方式相量图重要1.原副边同为星接或角接时，组别为偶数。
原副边星角不同接法时，组别为奇数。
原因;角接才会出现±1，当同为角接，原副边相减为偶数；只有当原副边星角不就会出现奇数。
Yy、Dd的6种接法：一次侧均以ABC为同名端，二次侧以abc为同名端，则有Yy0、Dd0YyDd4YyDd8；二次侧以xyz为同名端，则有YyDd6YyDd10YyDd2。
8）线对颜色区分：2.5mm2线对:红,黑2.5mm2单线:绿0.8mm2线对：⑴．白,白⑵．蓝,蓝⑶．橙,橙⑷．绿,绿⑸．棕,棕⑹．红,红电信局的大对数线序，大对数语音电缆线序，通信电缆线序色谱，HYA通信电缆线序色谱认识表大对数语音电缆线序-大对数音频电话线:大对数电缆: 阻燃大对数电缆：阻燃。
24 to cable chromatography: Hester prynne, white orange, white, green, white, brown, white, red, blue, red, orange, red, green, red brown, red, grey, dark blue, black and orange, dark green, dark brown, black ash, champak, yellow orange, yellow, green, yellow, brown, yellow, grey, purple, blue, purple, orange, purple, green, purple brown
1；ZR-KVVRP32多股铜芯、对绞、铜丝编织总屏蔽阻燃仪表信号钢丝铠装电缆1x2x1.5mm2千米6X2X1.5mm20.14X2X1.5mm20.11x2x1.5mm21.212X2X1.5mm22-KVVP32铜芯聚乙烯绝缘聚乙烯护套对绞、总屏。
Armoured cable including armoured thermocouple, armored thermal resistance, the armored heater and sheathed wire, mainly used in chemical industry, smelting, machinery manufacturing, power generation and scientific experiments, such as temperature crib, transmission and special heating, dosage is sheathed hot galvanic couple.