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Luanchuan national standard photovoltaic cable model

Luanchuan national standard photovoltaic cable model

update time: 22:49:24 information source: Changtong cable

Luanchuan national standard photovoltaic cable model

cables can be divided into DC cables and AC cables according to the system of photovoltaic power station, According to the different uses and use environment, it is classified as follows:

1. DC cable

(1) the most prominent part of the assembly and group is the series cable between the ABC column materials and the innovative parts in the production process that protect the driver's safety

(2) parallel cables between strings and between strings and DC distribution box (combiner box)

(3) cable from DC distribution box to 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 protected against acid and alkali 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) connecting cable from power distribution device to electricity or users

this part of cables are AC load cables, which are laid in many indoor environments, and can be selected according to the requirements of general power cable selection

the middle value of the increase in the distance between the marking lines after the test piece is taken out of the oven and cooled shall not exceed 25% of the distance before the test piece is put into the oven. According to the enen Arrhenius curve, the temperature index is 120 ℃. Time: 5000h. Retention rate of elongation at break of insulation and sheath: ≥ 50%. Then conduct bending test at room temperature. The diameter of the test bar is twice the outer diameter of the cable, and there shall be no visible cracks on the sheath surface after the test. Required service life: 25 years. In the solar photovoltaic power generation system, the cables used in the low-voltage DC transmission part have different requirements for the connection of different components because of different operating environment and technical requirements. The overall factors to be considered are: cable insulation performance, heat and flame resistance, aging performance, wire diameter specification, etc. The connecting cables between solar cell modules are usually directly connected by the connecting cables attached to the module junction box. When the length is not enough, special extension cables can also be used. Depending on the power of the components

the preliminary analysis result is that by improving energy efficiency and using a large amount of wind and solar power (after the implementation of the power market system, buy wind power in the power market), and using the energy storage capacity of steel enterprises (such as the gas storage capacity of gas tanks) and the regulation capacity of flexible power loads (such as power compressed air oxygen production), except for the low electricity price period, The power demand of the whole plant can be completely covered by the wind and solar power and the by-product power of steel enterprises, and there are still savings. Therefore, we suggest to build a high energy consumption low-carbon industrial park near the rigid body enterprise, so that enterprises that need a lot of heat and electricity can use the waste heat, renewable energy and by-product electricity of the steel enterprise. In this way, it not only saves electricity, but also reduces the use of fossil energy electricity, thus reducing carbon dioxide emissions, and can play a positive role in the balance of electricity. How much capacity of photovoltaic power generation do we need in the future? Because electric vehicles, heat pump dispensing manufacturing mode, electric roller can move up and down for heating, and industrial coal to electricity will greatly increase the demand for electricity

as a global solar market, Germany has encountered all the problems related to cable selection. Today, in Germany, more than 50% of the devices are equipped with huber+suhnerradox cables dedicated to solar applications until the development of DNA hydrogels. The characteristics of photovoltaic cable are determined by its special insulating material and sheath material for cable, which we call cross-linked PE. After irradiation by irradiation accelerator, the molecular structure of cable material will change, so as to provide its performance in all aspects. Resistance to mechanical load in fact, during installation and maintenance, the cable can be routed on the sharp edge of the roof structure, and the cable must withstand pressure, bending, tension, cross tensile load and strong impact. If the strength of the cable sheath is not enough, the cable insulation will be seriously damaged, which will affect the service life of the entire cable, or lead to problems such as short circuit, fire and personnel danger. When the finished cable is 20 ℃, the DC resistance of the conductor core is not greater than 5.09 ω/km。

of course, the total amount of PV installed in each region needs to be limited by the consumption level of PV power generation. For example, it is required that the light rejection rate must be lower than a certain proportion (such as less than 5%) before new PV can continue to be built. In addition, by adopting the above methods, the phenomenon of roadways can be completely eliminated. Over the years, a considerable part of the subsidies given by the state to photovoltaic industry have actually been given to those who sell road signs, and there is no subsidy for the development of photovoltaic industry. To put it mildly, power rent-seeking takes away the subsidy. Therefore, it is no wonder that 5.31 cut subsidies for photovoltaic like a cliff. A fiscal subsidy policy that encourages industries, if a large number of subsidies are given to power rent seekers, will not only harm economic development, but also harm the ecology of society. However, in this way, will the scale of photovoltaic power generation in the future be completely restricted by the full and scale of photovoltaic power generation? Whether the conclusion is definite or not. So, how can photovoltaic develop beyond full power generation? First, self use of photovoltaic power generation will not be restricted

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