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What are the common causes of cable aging? The most direct cause of wire and cable aging failure is insulation breakdown and breakdown. Many factors can reduce the sensitivity of insulation. According to the actual operation experience, it can be summarized into the following situations. 1) Reasons for cable aging: external force damage. From the analysis of the operation situation in recent years, especially in Haipudong, where the economy is developing rapidly, a considerable number of cable faults are now caused by mechanical damage. For example: when the cable is laid and installed, the construction is not standardized, which is easy to cause mechanical damage; when the civil construction is carried out on the directly buried cable, it is also easy to damage the wiring. l Sometimes if the damage is not serious, it will take months or even years for the damaged part to completely decompose and cause a failure. Sometimes serious damage may lead to short circuit failure, which directly affects the power plant and the safe production of power plant. 2) Reasons for cable aging: The insulation is damp. This is also common and usually occurs at cable joints in direct burial or drains. For example, substandard cable splices and prefabricated splices in wet climates can allow water or steam to enter the splices. Over time, water branches will form under the action of the electric field, gradually destroying the insulation strength of the cable and causing failure. 3) Reasons for cable aging: chemical corrosion. Cables buried directly in areas with acid and alkali effects tend to corrode the armor, lead or outer sheath of the cable. The protective layer is subjected to chemical corrosion or electrolytic corrosion for a long time, which makes the protective layer fail and the insulation is reduced. Cable failure. Chemical: Corrosion of cell cables is quite severe 4) Reasons for cable aging: long-term overload operation. In overload operation, due to the thermal effect of the current, the conductor inevitably heats up when the load current passes through the cable. At the same time, the skin effect of the electric charge, the eddy current loss of the steel armor, and the dielectric loss will also generate additional heat, which will increase the temperature of the cable. During long-term overload operation, excessive temperature will accelerate insulation aging and damage the insulation. Especially in hot summer, the temperature rise of the cable often causes the weak insulation of the cable to be broken down first, so in summer, there are especially many cable failures. 5) Reasons for cable aging: cable connector failure. The cable joint is the weakest link in the cable line, and the cable joint failure caused by the direct failure of personnel (poor construction) often occurs. In the process of making cable joints, if the original mesh of the joint is not under pressure or insufficiently heated, the insulation of the cable head will be reduced, resulting in accidents. 6) Reasons for cable aging: environment and temperature. The external environment and heat source of the cable can also cause the cable temperature to be too high, insulation breakdown, and even explosion and fire. For more information on EV cable for new energy vehicles and charging cables for electric vehicles, please visit OMG’s official website: https://www.omgevcable.com |
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Nowadays, for electric vehicles, increasing the cruising range to make long-range electric vehicles is the main development path. When the cost of batteries drops and the combined range reaches 500-600 kilometers, the main contradiction of electric vehicles changes from range anxiety to charging anxiety. Improving the charging power of electric vehicles mainly includes several core elements. The following is the way to analyze the reasons: First: increase the current. If we keep the other components the same and choose the path to increase the current, the main limitation is the heat loss due to the high current, which can make a big difference in the overall design. High currents in a circuit create high heat losses, as the resistance of all components (connectors, cables, electrical connections to batteries, bus bars, etc.) inevitably heats up. If the battery overheats during charging, these heat losses need to be taken into account when designing and sizing conductive elements to avoid problems such as overloading, overheating, or controlled derating of the charging current. Second: increase the voltage. Since the increase of the above current is limited, the current limiting current is generally defined as 500A, and the achievable power is around 200kW (Tesla designed more than 600A at 400V as an attempt), increasing the voltage to switch the 400V system to 800V becomes an option. This is a systematic improvement of all electrical components. The core switchgear and other parts have changed. At current costs, these modules developed to the 800V specification are relatively expensive. Taking the main inverter as an example, the cost of the core SiC module is about 4 times that of the original IGBT module. Let's take a closer look at some of the issues that need to be considered in a path that can be reached either way. Since several methods have the same requirements for the cell, we list the cell problem at the end, focusing on the electrical connection and thermal management inside. |
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When it comes to the electric vehicle charging pile industry, the problem facing charging pile investors, operators and construction enterprises is how to get rid of the dilemma of "burning money" in the shortest possible time. For enterprises and operators, this war can become a "consumption war", in which the real realization problem is to "live" to the turning point of profit. In order to seize the charging pile market, relevant industry giants have made their own tricks. From power grid charging stations to energy deployment, from automobile manufacturers to charging pile operators, each process tends to the development of charging pile industry. Among them, the State Grid has built a highway fast charging network covering 176 cities. At the same time, it is also vigorously developing the energy storage system dominated by pumped storage to improve the flexible regulation capacity of the power grid. With the continuous improvement of the network coverage of charging piles, the value and potential of charging piles are increasingly reflected. Facing the huge market opportunities, industry players need to focus on policy, capital, technology, operation, service and business model to form a long-term development strategy. Charging piles cover the world. New energy vehicles will benefit the charging pile industry, attract more investors and find new opportunities for more enterprises. Finally, after years of research and application and continuous support of policies, the charging pile industry has gradually moved towards a new stage of mature and stable development. In the future, the charging pile will usher in new opportunities and role changes under the guidance of "new infrastructure"; Building a diversified and integrated professional solution integrated with the technology of the new era is an important development trend of the charging pile industry chain in the future. In the huge market space, the charging pile industry is still in the period of technological and policy change, with risks and opportunities coexisting, which is also faced and required to be solved in the future. This makes the industry develop effectively. Tips：To learn more EV charging cable and EV cable,Please visit OMG's website: https://www.omgevcable.com/ |
