Wire and cable manufacturers talk about how to buy wire and cable?
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2022-09-28

Wire and cable manufacturers talk about how to buy wire and cable?

Wire and cable manufacturers talk about how to buy wire and cable? Fireproof cable refers to a cable that can maintain a certain period of time under the premise of flame burning. In China's national industry standard GB12666.6 (IEC331), refractory experiments are divided into two grades A and B. The temperature of Class A flame is 950~1000 ℃, the continuous fire supply time is 90min, the temperature of Class B flame is 750~800 ℃, and the continuous fire supply time is 90min. During the whole experiment period, the test piece shall bear the rated current value specified by the commodity. Fireproof cables are widely used in multi-storey buildings, underground railways, underground streets, large and medium-sized power plants and more important factories and mines and enterprises and fire safety and fire rescue related areas, for example, fire equipment and emergency guidance lights and other emergency facilities power supply lines and control loop. 1. The insulating layer (generally over 100MΩ) and compressive strength (above 500V and below 1500V) of the protective wire sleeve. 2, line resistance (a certain cable diameter, conductivity, length shall not exceed a certain resistor). 3, continuous high temperature impact of 140 degrees, ultra-low temperature -30 degrees under the wire can not be dry and so on. 4, appearance specification, wire must have certification certificate, manufacturer

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Yunnan cable manufacturers tell you how to choose the cable?
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2022-09-22

Yunnan cable manufacturers tell you how to choose the cable?

Wires and circuits are hidden works, and even small hidden dangers may cause serious safety accidents. Therefore, before laying the line, we should make full preparations. For example, when choosing wires and cables, we need to determine the appropriate cable based on various considerations. There are too many types of wires and cables, how should we choose? The following Yunnan cable manufacturers will analyze for you. 1. Selection of wire and cable models (1) When selecting wire and cable, the use, laying conditions and safety should be considered;(2) According to different uses: power cables, overhead insulated cables, control cables, etc. can be selected;(3) According to different laying conditions, general plastic insulated cables, steel tape armored cables, steel wire armored cables, anti-corrosion cables, etc. can be selected;(4) According to safety requirements, optional flame retardant cable, low smoke halogen-free cable, fire-resistant cable, etc. 2. Selection of wire and cable specifications (1) When determining the specifications (conductor cross section) of wires and cables, conditions such as heating, voltage loss, economic current density, mechanical strength, etc. should be considered;(2) Due to the large load current of low-voltage power lines, the cross section is generally selected according to the heating conditions, and then the voltage loss and mechanical strength are checked;(3) Since low-voltage lighting lines require high voltage levels

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How to ground the high voltage cable of Yunnan cable manufacturer?
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2022-09-16

How to ground the high voltage cable of Yunnan cable manufacturer?

1. Yunnan cable manufacturers of high-voltage cable why grounding? 1. high-voltage three-core cable grounding: voltage level of 35kV and below the cable grounding at both ends. This is because most of these cables are three-core cables. In normal operation, the total current flowing through the three cores is zero, there is substantially no magnetic flux linkage outside the aluminum clad layer or the metal shielding layer, and there is substantially no induced voltage at both ends of the aluminum clad layer and the metal shielding layer. Therefore, after both ends are grounded, the induced current will not flow through the aluminum clad layer or the metal shielding layer. 2. Grounding of high-voltage single-core cable: When the cable is running with load, induced voltage will be formed on the shielding layer. If the shields at both ends are grounded at the same time, a loop will be formed between the shielding layer and the ground, and an induced current will be generated. In this way, the cable shielding layer will generate heat, lose a lot of power, and affect the normal operation of the line. When the cable line is short-circuited, subjected to lightning impulse or operating overvoltage, a very high induced voltage will be formed on the shield. This will endanger personal safety and may even pierce the outer sheath of the cable. In order to avoid this phenomenon, one end grounding is usually used. When the line is long, midpoint grounding and cross interconnection can also be used. When making the cable head of high-voltage single-core cable, the steel armor and copper shield must be welded and grounded separately. its

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How long is the cable life of Yunnan cable manufacturers?
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2022-09-14

How long is the cable life of Yunnan cable manufacturers?

The general service life of cables from Yunnan cable manufacturers is 20 years. Some people may say that life is more than 20 years, or even longer. Yes, there are indeed cables with a lifespan of more than 20 years. From a safety point of view, the design life is the longer life of the cable. Factors affecting the life of cable manufacturers in Yunnan: 1. External damage: In the past ten years, the economy has developed rapidly and the country has developed too fast. Life and traffic are more obvious, especially in today's high-speed economic development today. Although cables are known to be damaged by external influences, many cable failures are caused by mechanical damage. 2. Insulation damping: In general, most cables are buried underground or in underground drains. In many cases, unqualified cable joints will be performed under wet weather conditions, which will cause water or steam to enter the joint. After a long time, water branches will be formed under the action of the electric field, which will gradually destroy the insulation strength of the cable and cause failure. 3. Chemical corrosion: cable buried in the ground. When selecting the type of buried cable, the normal service time of the corrosion-resistant cable is usually specified according to the corrosion capacity. If the anti-corrosion cable is not buried in the ground, it will be affected by microorganisms in the soil. Long-term load operation: the cable is heated, the insulation is reduced, it is also easy to age, and the line is short-circuited. High temperature for long-term overload operation

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Yunnan Cable Manufacturers: Main Work Contents of Cable Daily Maintenance
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2022-09-05

Yunnan Cable Manufacturers: Main Work Contents of Cable Daily Maintenance

Yunnan cable manufacturers to share the cable daily maintenance of the main work content: 1. load monitoring by monitoring the load of the cable, you can understand the cable load changes, from the principle of control cable overload, analysis of the running state of the cable. Because overload is very harmful to the cable, the load of the cable needs to be measured and monitored frequently. The load of the cable can be measured with a clamp-on ammeter, and the cable should be kept running under the specified allowable continuous current carrying capacity. Yunnan cable manufacturers suggest that in order to prevent premature aging of cable insulation, the line voltage should not be too high, generally should not exceed 15% of the rated voltage of the cable. 2. The operation of the temperature monitoring cable will be affected by environmental conditions and heat dissipation conditions, and local temperature will rise in the early stage of cable failure, so it is necessary to monitor the temperature of the cable. Using various instruments to measure the temperature of cable line sheath, cable connector and other components, the purpose is to prevent the cable insulation from exceeding the maximum allowable temperature and shorten the cable life, in advance to prevent the occurrence of cable accidents. The measurement of cable temperature should be carried out in summer or when the cable load is the largest, and the line segment with the most dense cable layout or the worst heat dissipation condition and the greatest influence by external heat source should be selected. When measuring the temperature of directly buried cable, it shall be measured

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Yunnan cable manufacturers: wire and cable products are mainly divided into five categories
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2022-08-29

Yunnan cable manufacturers: wire and cable products are mainly divided into five categories

Yunnan cable manufacturers: wire and cable products are mainly divided into five categories 1. bare wire and bare conductor products The main features of these products are: pure conductor metal, no insulation and sheath, such as steel core aluminum stranded wire, copper aluminum bus, electric locomotive wires, etc. The processing technology is mainly pressure processing, such as melting, rolling, stretching, twisting/compression twisting, etc. Products are mainly used in the suburbs, rural areas, users of the main line, switch cabinets and so on. 2. The main features of such products as power cables are: squeezing (winding) a layer of insulating layer around the conductor, such as overhead insulated cables, or stranding several cores (corresponding to the phase line, zero line and ground line of the power system), such as overhead insulated cables with more than two cores, or adding a layer of sheath, such as plastic/rubber sheathed wires and cables. The main process technologies include drawing, stranding, insulation extrusion (winding), cable forming, armor, sheath extrusion, etc. There are some differences in the different process combinations of various products. The products are mainly used for the transmission of high-voltage electric energy in power generation, distribution, transmission, transformation and power supply lines, with large current (tens of amperes to thousands of amperes) and high voltage (220V to 500kV and above). 3. Yunnan cable manufacturers share the main features of wires and cables used in electrical equipment. The main features of such products are: many varieties and specifications, wide application range, 1kV

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International Business:0871-67334199
Business fax: 0871-6738 8841
Sales Phone:18213841134(Liu Zong)0871-67388840
Company Headquarters: 11th Floor, Tower 1, Dongju Jiaxin Business Center, Guandu District, Kunming City, Yunnan Province
Production base: Xiaoshao and other areas of Qidian Industrial Park, Chenggong District, Kunming City, Yunnan Province

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