High-yield and high-quality wire and cable products are by no means judged by inspection alone, but they are tested and judged as high-quality products after being manufactured during the design and production process. Product quality is a comprehensive reflection of the company, so improving the quality of wire and cable products is the responsibility of all employees of the company. To improve product quality, we must promote total quality management, rely on the masses, and ensure product quality. Product quality inspection is not only an important part of total quality management, but also an indispensable process for ensuring product quality in the production process. It is an important means to ensure product quality. Therefore, we must continue to strengthen the quality inspection of wire and cable product quality.
Cable symmetry design: For 1.8/3KW and below special-purpose inverter motor cables, and symmetrical 3+1 and 4-core cables can only be used for main power input cables, but it is better to use symmetrical structure cables. The symmetric cable structure is required for both the inverter and the inverter motor cables. The symmetric cable structure has three cores and three cores and three cores. The core of the three and three cores is the fourth core of the cores of the three major and minor cores ( Neutral core is decomposed into three insulated cores with smaller cross-sections. The three large and small cores are symmetrically cabled. This cable structure differs from 6/10kV ordinary power cables for special 6/10kV inverter motor cables. , Ordinary power cable is a three-insulated wire core shielded with copper tape after the cable, while the special frequency motor cable is shielded by copper wire and copper stripped after the phase-separated jacket, and then symmetrical cable, symmetrical cable structure due to the mutual wire Exchangeability, better electromagnetic compatibility, play a role in the suppression of electromagnetic interference, can offset the odd-order frequency of high-order harmonics, improve the anti-interference of special-purpose cables for frequency conversion motor, and reduce the overall system Electromagnetic radiation.
Cable symmetry design: For 1.8/3KW and below special-purpose inverter motor cables, and symmetrical 3+1 and 4-core cables can only be used for main power input cables, but it is better to use symmetrical structure cables. The symmetric cable structure is required for both the inverter and the inverter motor cables. The symmetric cable structure has three cores and three cores and three cores. The core of the three and three cores is the fourth core of the cores of the three major and minor cores ( Neutral core is decomposed into three insulated cores with smaller cross-sections. The three large and small cores are symmetrically cabled. This cable structure differs from 6/10kV ordinary power cables for special 6/10kV inverter motor cables. , Ordinary power cable is a three-insulated wire core shielded with copper tape after the cable, while the special frequency motor cable is shielded by copper wire and copper stripped after the phase-separated jacket, and then symmetrical cable, symmetrical cable structure due to the mutual wire Exchangeability, better electromagnetic compatibility, play a role in the suppression of electromagnetic interference, can offset the odd-order frequency of high-order harmonics, improve the anti-interference of special-purpose cables for frequency conversion motor, and reduce the overall system Electromagnetic radiation.
Shield structure design: 1.8/3kV and below special frequency motor shielded cable general shield, 6/10kv frequency motor special cable shield consists of phase shield and total shield, phase shield can generally be copper shield or copper wire Copper tape combination shield. The total shielding structure can be copper wire copper belt combination shield, copper wire braided shield, copper tape shield, copper wire braided copper tape shield, etc. The cross-section of the shield layer and the main core cross-section are in certain proportion. The shielded cable of this structure can resist electromagnetic induction, poor grounding, and conduction interference of the power line, reducing inductance and preventing excessive induced electromotive force. The shield layer not only plays a role in suppressing the electromagnetic wave from being emitted to the outside, but also serves as a path of the short-circuit current, which can play a role in protecting the neutral core. 6/10kV special-purpose motor for frequency-converter motor, taking into account that the cable is often subjected to radial external force during use, increase the galvanized steel tape pinning layer outside the cable shielding layer (add shielding sleeve between the shielding layer and the steel pin pin layer ). Steel strip pin is mainly used as a radial mechanical protective layer of the cable, and it also plays an additive role in total shielding. In particular, steel tape armor and copper wire and copper tape shielding adopt two different shielding materials. The electromagnetic shielding plays a complementary role and the shielding effect will be better.
Cable electrical performance design: 1.8/3kV and below The electrical performance of special cables for frequency conversion motor is designed according to GB/Tl2706, 2008 standard. 6/10kV special motor for frequency conversion motor meets the GBT/l2706.2008 standard, adding capacitance and inductance and other electrical performance requirements. According to the actual use of the special cable for variable frequency motor and reference GB/T12706.2008 and ABB Company's technical conditions for the power transmission cable, determine the electrical performance parameters of the cable.
The main manufacturing process of the cable technology: In the process of the production of special cable for frequency conversion motor, the extrusion process of the insulated wire core and the cabling process are the most critical processes. Insulated core extrusion process The quality of the insulated core directly affects the electrical performance of the cable. In order to improve the quality of cables, we choose the production of high-performance insulating materials, such as 1.8/3kv special-purpose cables for variable-frequency motors, 10kV cross-linked insulating materials, 6kVv inverter-dedicated cables, 35kv cross-linked insulating materials, conductor shields, and insulation shields. Insulation materials are imported materials. In the production process, special attention is paid to the purification of raw materials, and the shielding and insulation materials are tightly packed to control the insulation eccentricity and the insulation outer diameter to be uniform, which can reduce the interface effect and improve the electrical performance of the cable. The cabling process requires the symmetric structure of the inverter cable. When the cable is formed, the tension of the insulated wire core must be ensured to be uniform, so that the length of the core after the cable is kept as consistent as possible, otherwise it will cause structural changes, resulting in non-uniformity of capacitance and inductance, affecting the cable Electrical performance.
Inspection of wire and cable products is a system that strictly implements the national guidelines and policies on product quality, and the standards for wire and cable technology products promulgated by superiors, and the system for ensuring product quality. The quality of wire and cable products is related to the safety of electricity use, to the improvement of the quality of life of the people, and to the reputation of the company.
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