China Zhenglan Cable Technology Co., Ltd Company News

Dear Customer, Thanks for your visiting our website. Kindly note we are on a 7-day National Day holiday from October 1st(Saturday) to 7th(Friday) and will be back from October 8th( Saturday). During holiday, we may have limited access to email and work may be delayed or stop temperaturely. We will contact you the first time we came back. Kindly ask for your understanding. Zhenglan Cable Technology Co., Ltd 2022.9.30

When a single core cable is started or stopped by alternating current or direct current, a corresponding alternating magnetic field will be generated around the cable, and an induced current will be generated in the metal material. This current flows inside the metal material, much like a vortex of water, so it is called eddy current, or eddy current for short. The thermal effect of eddy current can heat the metal materials in a short time. If the heat cannot be emitted in time, it will cause the cable insulation layer to melt or accelerate the aging, and the insulation performance will be weakened, thus causing cable breakdown.   The armored steel strip has good magnetic conductivity, which can be magnetized under a small magnetic field and generate eddy current. Non magnetic materials such as stainless steel tape, copper tape, aluminum tape or non-magnetic metal wire shall be used for armouring of single core cables.   In addition, it is better to lay single core cables in finished form during construction. Single core cables should avoid magnetic materials as far as possible, such as iron pipes, iron clamps, etc., which can form closed loop magnetic materials.   In addition, for a three core cable, the alternating magnetic fields generated by the three core phase relationship cancel each other, so that the sum of the induced current vectors is 0, and no magnetic force lines pass through the armor. Therefore, steel tape armouring can be used.

Dear Customer, Thanks for your visiting our website. Kindly note we are on Mid-Autumn Festival holiday from Sept 10th to 12th. Work resume from Tuesday( Sept, 13th). During holiday, all work will become slow compared with normal days. But we will get back to you as quickly as we can after holiday. Thanks for your support as always. Sincerely yours, Zhenglan Cable Technology Co., Ltd Sept 9th, 2022

Tinned copper wire has a silver appearance because tin is a silver metal. The process of tinned copper wire is a little more complicated than that of bare copper wire. At room temperature, tin is very stable in the air, because a dense oxide film will be formed on the surface of tin to prevent the continued oxidation of tin. Therefore, the copper surface is tinned, the first does not affect the resistance, and the second can improve the oxidation resistance of copper to a certain extent.   The purpose of tinning, silver plating (or even gold plating) for wire and cable conductors is to prevent copper wires from being oxidized and blackened at high temperature and humidity, and to improve conductor solderability and reliability. The operating environment of photovoltaic power plants is generally harsh, and they are often installed in deserts, barren mountains, water surfaces, roofs and other environments. It is required that the resistivity of photovoltaic cables must be good, not easy to oxidize, and can be used for a long time. Therefore, tinned copper wire is selected as the conductor will best fits the use environment and has the most stable electrical performance.   Zhenglan Cable supply power cable, solar cable, feel free to send us your quote.

The main function of the electric wire is not to spread the current to objects outside the target while conducting electricity, which is mainly the function of the insulating layer. Therefore, a good insulation layer is the best guarantee to avoid some risks caused by electricity consumption. The insulation layer is plastic, so we can try to test the plastic method to check the quality of the wire.       So it's easy. Just remember these steps：   1. Pull: If the quality of the insulating layer is poor, it will be easily deformed and cracked when pulling hard. Try to pull as much as possible. It is difficult to judge whether the quality of the insulating layer is good or bad. 2. Folding: Bend a small section of cable at will, if there is no break or white mark at the bend, the quality is good. 3. Ignite: Ignite the wire with fire, and light it with a lighter. If it does not catch fire when it is lit, it is a high-quality wire. It is a good flame retardant wire. If it is lit and emits thick black smoke, it will catch fire on its own after leaving the flame. Don't even think about it. You buy garbage and throw it into the trash can immediately. 4. No odor: It is fake and inferior wire that smells stinky, and the high-quality insulating layer will not have odor that suffocates the nose even if it is ignited.

Power cables are widely used to transmit and distribute electric energy. They are often used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. The main lines in the power system are generally power cables used to transmit and distribute high-power electric energy, including 1-500kv and above voltage levels. Therefore, the quality of cable products is very important, and the quality and thickness of cable sheath are equally important. What effect does the thickness of cable sheath have on the cable? 1. Affect the service life of power cables The first is the environment. After the construction of power cables, they are basically buried in the ground, immersed in water, in the open air or in an environment prone to corrosion, plus the corrosion of external media for a long time, the insulation level and mechanical level of the thinnest point of the cable sheath will decline. In case of line grounding fault, the thinnest point of cable sheath may be broken down, increasing the hidden danger of safety accidents. The other is the internal consumption of heat energy generated by cables. The cable will produce a lot of heat energy in the process of transmitting electric energy, which is a consumption of the sheath. If the thickness of the cable sheath is not enough, the copper core of the conductor will directly melt the sheath material after heating, which will cause circuit failures and other related safety problems. 2. Impact on Construction According to the current requirements, more and more environmental requirements require that the outer diameter of high-voltage cable products must be small, and it is necessary to consider leaving gaps in the laying process, so as to dissipate the heat generated by the cable after it is powered on. The thickness of the sheath is too thick, which will increase the difficulty of laying, so the thickness of the cable sheath must strictly comply with the relevant national standards, otherwise it cannot protect the cable conductor.