China Zhenglan Cable Technology Co., Ltd Company News

1. fire-resistant XLPE insulated, PVC sheathed power cable It can be laid indoors, in tunnels and pipelines, and can withstand certain laying traction, but the cable cannot bear external force, and single-core cable is not allowed to be laid in magnetic material pipelines. If you need to bear the external force of machinery and wrap the steel tape armour. Suitable for special requirements, such as large-capacity power plants, nuclear power plants, underground railways, high-rise buildings, etc. 2. XLPE insulated, PVC sheathed power cable It can be laid indoors, in tunnels and in pipelines, and can withstand certain laying and traction, but the cable cannot bear external force, and single-core cable is not allowed to be laid in magnetic material pipelines. If you need to bear the external force of machinery and wrap the steel tape armour. 3. Flame retardant PVC insulated, PVC sheathed power cable It can be laid indoors, tunnels, cable trenches, pipelines, flammable and severely corroded places, but cannot bear external mechanical forces. If you need to bear the external force of machinery and wrap the steel tape armour. Features: In the case of open flame burning, remove the fire source, ≤ 12S automatic extinguishing. 4. Flame retardant cross-linked polyethylene insulated, polyvinyl chloride fuel sheathed power cable It can be laid indoors, in tunnels and pipelines, and can withstand certain laying traction, but the cable cannot bear external force, and single-core cable is not allowed to be laid in magnetic material pipelines. If you need to bear the external force of machinery and wrap the steel tape armour. Features: In the case of open flame burning, remove the fire source, ≤ 12S automatic extinguishing. 5. Fire-resistant PVC insulated, PVC sheathed power cable It can be laid indoors, tunnels, cable trenches, pipelines, flammable and severely corroded places, but cannot bear external mechanical forces. If you need to bear the external force of machinery and wrap the steel tape armour. Suitable for special requirements, such as large-capacity power plants, nuclear power plants, underground railways, high-rise buildings, etc.

In the process of photovoltaic power station construction, in addition to the main equipment, such as photovoltaic modules, inverters, step-up transformers, the supporting connected photovoltaic cable materials also play a vital role in the overall profitability, operation safety, and efficiency of the photovoltaic power station. The following is a detailed introduction to the use and use environment of the common cables and materials in the photovoltaic power station.   According to the system of photovoltaic power station, cables can be divided into DC cables and AC cables, which are classified as follows according to different uses and environments: 1. DC cable (1) Series cables between components. (2) Parallel cables between strings and between strings and DC distribution box (junction box). (3) Cable between DC distribution box and inverter. The above cables are DC cables, which are laid outdoors. They need to be moisture-proof, sun proof, cold resistant, heat-resistant and UV resistant. In some special environments, they also need to be resistant to acid-base and other chemicals. 2. AC cable (1) Connecting cable from inverter to step-up transformer. (2) Connecting cable from step-up transformer to power distribution device. (3) The connecting cable from the power distribution device to the power grid or users. This part of the cable is AC load cable, laying more indoor environment, can be selected according to the general power cable selection requirements.   Zhenglan Cable Technology Co., Ltd can supply you both AC&DC use cables. Welcome your inquiry.

1. Ambient temperature: The coefficient of insulation resistance is closely related to temperature. The higher the temperature is, the smaller the insulation resistance is. This is a conclusion drawn from numerous experiments and practices. The coefficient of insulation resistance decreases exponentially with the increase of temperature, while the conductance (power conduction) power increases with the increase of temperature.   2. Humidity effect: Conductance -- a parameter indicating the current transmission capacity of a conductor. The conductivity of water is large, and the water molecule is much smaller than that of polymer (cable sheath material). When the surrounding humidity is high, the water molecule is easy to penetrate into the insulation, resulting in the increase of conductivity and the decrease of cable insulation resistance.   3. Purity of insulating material: Insulation refers to wrapping the charged body with non-conductive material. What if the purity of insulating material is not enough? What about the conductive materials mixed in the insulating materials—— There is no doubt that this will reduce the insulation resistance of the cable, and ultimately affect the quality of the finished cable. This is an important factor affecting the insulation resistance of cables. Cable insulation resistance is one of the main electrical properties of insulating materials, which is an important index to measure wire and cable products. Once it is lower than a certain numerical standard, it will lead to low power transmission efficiency, waste of power, increase the probability of cable breakdown and increase the risk. Therefore, we must pay attention to this key issue when purchasing wires and cables.

As an important structure of medium voltage power cable, metal shielding layer will pass capacitive current under normal operation of the cable, and act as the path of short-circuit current in case of short circuit; At the same time, the electromagnetic field generated when the cable is electrified is shielded in the insulated core to reduce the electromagnetic interference to the outside world.   The copper strip shielding is composed of a layer of overlapped soft copper strip, and the double-layer copper strip can also be used for gap wrapping. The nominal thickness of copper strip for single core cable shielding is not less than 0.12mm. The copper wire shield is composed of loosely wound soft copper wire, and its surface is tightly tied with reverse wound copper wire or copper tape. The average gap between adjacent copper wires shall be no more than 4mm.   The shielding method of copper wire and copper strip winding can improve the disadvantages of shielding method of copper strip winding from the structure. It has neither oxide layer produced by copper strip overlapping, nor strong bending and hot and cold deformation, and the copper strip winding is not easy to arch and embed into the insulation shielding layer. The cross-section of the metal shield directly affects the ability of the cable to withstand the short-circuit current in case of fault. If the cross-section is too small, the short-circuit current will overheat or burn out and damage the insulation. Therefore, it is necessary to determine the cross section of metal shield according to the fault current capacity.   In 10kV and below cable, when conductor section is more than 500, try to use copper wire shielding! If you insist on using copper tape shielding, you need to thicken the thickness of copper tape! According to the conditions of cable laying, if it needs to carry a large short-circuit current, it is recommended to use copper wire shielding. Therefore, the difference between copper tape shielding and copper wire shielding is the ability to carry short-circuit current. Copper wire is slightly larger (also depends on the effect of copper wire). Copper tape is homogenizing magnetic field and shielding.  

Drainage line is a kind of lightning protection facilities, which is mainly used for directly buried cables to prevent induced lightning current. That is to say, when there is lightning damage, the induced lightning may enter the cable (mainly the cable) in the way of induction. This is to lay the drainage line in the cable construction. It can be said that the induced current is guided into the ground, so as to protect the personal and equipment safety. The drainage wire has three functions A. Generally speaking, if the peak value of direct lightning current hitting the drainage line is not higher than 15ka, there is almost no counterattack to the cable. With the help of the lightning current flowing on the drainage line, the induced current on the cable is opposite to the lightning current directly discharged from the lightning point to the cable, so that the total current on the cable is significantly reduced, So as to reduce the overvoltage between the cable core and the metal sheath. B. Even if the soil between the drain line and the cable is broken down and discharged to the cable, the drain line can reduce the degree of lightning damage and the lightning current flowing into the cable. C. It can reduce the energy produced by the thermal and mechanical effects of lightning stroke on the cable.  

Dear Customer, Welcome to our website. and Thanks for your support as always. Here comes the May Day of 2021, we are on holiday from May 1st(Saturday) to 5th(Wednesday). Work will resume from May 6th (Thirsday). During the holiday, for any of your inquiries, we will get back to you at our earlist time after holiday. Thanks for your kind understanding. Wish you all a happy holiday also. Regards Zhenglan Cable Technology Co., Ltd April 30th, 2021