Frequency Cable Structure Design
Frequency Converter and energy saving effect is very obvious that
, in high-power motor with frequency converter speed control motor, the generator can be saving 30%. And after using the frequency control to achieve the soft start the motor, the motor and steady, motor bearings reduce wear and prolong motor life and maintenance cycle. See more exciting information
HC electrical network Frequency energy saving devices is very obvious that the use of high power frequency conversion electrical motor, the whole Generator Can Saving 30%. And after using the frequency control to achieve the soft start the motor, the motor and steady, motor bearings reduce wear and prolong motor life and maintenance cycle. Therefore, the frequency control technology Oil , Metallurgy , Power generation, railways, mining and other industries has been widely used.
1. Cable symmetry design For 1.8/3KW and the following variable frequency motor dedicated cable, and symmetric 3 +1 core and 4 core cable can only be used for the main Power supply Input cable, it is best to use symmetrical structure cables. Inverter Frequency electrical cable need to be asked and symmetrical structure cables, symmetrical 3 core cable structure of two core and 3 +3, 3 +3 three core cable structure is a small four-core insulated wire core in the fourth core (neutral line core) into three smaller sections insulated wire core, the three symmetrical cores into three small wire cable, special cable for 6/10kV frequency conversion motor, the cable structure and 6/10kV general Power cable Different from ordinary power cable is 3 core insulated wire into the cable after the use of copper shielding, while the variable frequency motor special shielded cable is copper wire copper phase separation after the extruded jacket, and then into the cable symmetrical, symmetrical cable structure as wire interchangeability, better electromagnetic compatibility, electromagnetic interference on the suppression play a role, he can offset the higher of the odd harmonic frequencies, frequency conversion motor special cable enhance immunity, reduce the whole system electromagnetic radiation.
2. Shielding design of the structure
1.8/3kV and the following frequency shielded motor cables commonly used special shield, 6/10kv frequency motor special shielded cable and shielded by the shield phase separation structure, phase separation can be used generally shielded copper wire or copper shield combination of shielding. Copper wire shield structure can be used combination of shielded copper wire braid shield, copper shield, copper wire braided copper shielding, shielding the core section and the main line section by a certain percentage. The structure of the shielded cable may be resistance to electromagnetic induction, ground and power line conducted interference bad, reducing the inductance to prevent the induced electromotive force is too large. Inhibition of both the electromagnetic wave shielding layer play the role of the external launch, but also as a short-circuit current of the channel, can play a neutral role in the protection of the core. 6/10kV dedicated frequency electrical cables, taking into account the cable often in the course of the radial external force, an increase in the cable outer shield layer of galvanized steel pin installed (in the shielding layer and steel pin plus separate sets of equipment layer ). Steel pin installed mainly as a mechanical protective layer of radial cables, but it also played an additional shielding effect of the total, particularly steel and copper sheathed, copper tape shield, is using two different shielding materials, electromagnetic shielding play a complementary role, shielding effect will be better.
3. Cable Electric Performance Design 1.8/3kV and the following special cable electrical performance frequency conversion motor Junan GB/Tl2706, 2002 standard design. 6/10kV frequency conversion motor to meet the GBT/l2706.2002 dedicated cable standards, an increase of capacitive and inductive electrical performance requirements. Frequency electrical cable according to the actual use of specific reference to GB/T12706.2002, and ABB, and the electricity transmission cable on the company's technical requirements, determine the parameters of the cable's electrical properties.
4. Cable's main manufacturing process technology requirements
In frequency-specific electrical cable production process, the insulated wire core extruding process, a cable of workflow processes is the key.
Insulated wire core wire with extruded insulation core processes will directly affect the quality of cable's electrical performance. In order to improve the quality of cables, we chose the production of high electrical properties of insulating materials, such as variable frequency motor 1.8/3kv special cable, cross-linked with 10kV insulation material, 6/10kv dedicated frequency electrical cable insulation cross-linked with 35kv conductor shielding and insulation shielding and insulation materials are used imported materials. In the production process, we particularly pay attention to the purification of raw materials, extruded insulation shield and tightly control the degree of insulation and insulation diameter eccentric uniform, this reduces the interface effect, increase cable electrical performance.
Into the cable structure of symmetry operations required conversion cable, a cable must be insulated cores to ensure uniform tension, so that after the cores into the cable length as consistent as possible, otherwise it will lead to structural changes, resulting in capacitance and inductance of the inhomogeneity affect the cable's electrical performance.
Frequency Cable Structure Design
By: erenber
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