According to the actual cable engineering data, the voltage rating of the variable frequency cable laid in this way is almost under 1.8/3kv, and this voltage level of the frequency conversion cable does not require phase-shielding, so we can use industrial adhesive in its When the cable is attached, the core is stuck to fix its structure. It is understood that there have been very symmetrical communication cables using this method to solve similar problems.

Conclusion: The symmetric 3+3 structure of the frequency conversion cable can effectively reduce the mutual interference with the outside world. It is more valuable and more competitive in practical applications. Our company has used this structure to produce variable-frequency cables for several years, and it has been well received by users. In the domestic view, although the technology is not yet mature, some problems still need to be solved (for example, the cross-sectional area of ​​the three small cores of the 3+3 type inverter cable is too small), but this has not stopped its development. The trend is believed to be resolved in the near future. The 3+3 symmetrical frequency conversion cable will also be favored by more users with the advantages of low interference and high harmonic resistance.

Practical application problems

The structural design of the cable is closely related to the actual operation and the reasonableness of the application. The two complement each other. The frequency conversion cable we designed is a 3+3 symmetrical structure, and the cable really works after laying. In other words, whether or not it is a symmetrical structure after laying is the key to the application of variable frequency cables.

The influencing factors specifically include the following two points:

a) In production. Especially in the cable connection is the most critical. The symmetry of the cabled structure directly affects the operation after laying. This requires the rational design of the technicians and the mature technical level of the operators, as well as the stable performance of the production equipment. These are indispensable, and it is also a necessary condition for the successful use of the 3+3 symmetrical structure of the frequency conversion cable.

b) Laying. This point is something we must focus on. Most of the frequency conversion cables are laid indoors and do not need to be outfitted. The space for installation is not very large. The small space will inevitably lead to multiple bends, and the symmetrical cable will cause asymmetry due to multiple bends.

In the past two decades, the frequency conversion speed regulating motor has made great progress both at home and abroad. The annual growth rate is slightly over 10%, and the annual growth rate of DC transmission is 3-4%. Variable frequency motor has many advantages, such as less equipment investment, simple structure, small size, low cost, energy saving, large speed range, constant power, constant speed, easy to use, large capacity and so on. Therefore, it is currently widely used in the metallurgy, mining, and railway industries, and recently it has also been widely used in home appliances. Variable frequency speed control technology related to variable frequency motor, variable frequency power supply and connection cable, this section cable length is not very long, the cross section is not very large, the insulation performance belongs to the power cable category, because the actual operating frequency is 30 ~ 300Hz, often referred to as Inverter cables, currently used cross-linked polyethylene insulation material.

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